S. R. Assi, K. F. Konan, N. G. Aliko, K. C. Boussou, K. Y. Bony, Aka Jean-Paul Agnissan, G. Gourène
In Cote d’Ivoire, the Aghien Lagoon is under heavy fishing pressure. Mortality, recruitment pattern and exploitation rate of Schilbe mandibularis and Schilbe intermedius were investigated in this lagoon. Fish samples of both sexes (N = 575) were collected monthly between June 2014 and May 2015 from artisanal and experimental captures. Natural mortality was higher in S. intermedius (M = 0.89 years-1) than in S. mandibularis (M = 0.58 years-1). The population of S. intermedius was more vulnerable to fishing (F = 2.90 years-1) than S. mandibularis (F = 0.51 years-1). The Z/K ratio (Z/K = 2.65 for S. mandibularis; Z/K = 4.85 for S. intermedius) indicated that mortality was predominant over growth for the two species. The recruitment pattern showed one Gauss curve translates was continuous for each species. For S. mandibularis, the exploitation rate (E = 0.47) was close to E 0.1 (E 0.1 = 0.46), indicating that S. mandibularis’s stock was in an optimum state of exploitation. However, for S. intermedius, Emax was lower (Emax = 0.57) than the exploitation rate (E = 0.77). This result reflected overexploitation of this species. Key words: Schilbe mandibularis, Schilbe intermedius, mortality, recruitment, exploitation, Aghien Lagoon.
{"title":"Mortality, recruitment pattern and exploitation rates of two Schilbe Oken, 1817 populations: Schilbe mandibularis and Schilbe intermedius from the Aghien Lagoon; estuarine system of West Africa","authors":"S. R. Assi, K. F. Konan, N. G. Aliko, K. C. Boussou, K. Y. Bony, Aka Jean-Paul Agnissan, G. Gourène","doi":"10.5897/IJFA2018.0669","DOIUrl":"https://doi.org/10.5897/IJFA2018.0669","url":null,"abstract":"In Cote d’Ivoire, the Aghien Lagoon is under heavy fishing pressure. Mortality, recruitment pattern and exploitation rate of Schilbe mandibularis and Schilbe intermedius were investigated in this lagoon. Fish samples of both sexes (N = 575) were collected monthly between June 2014 and May 2015 from artisanal and experimental captures. Natural mortality was higher in S. intermedius (M = 0.89 years-1) than in S. mandibularis (M = 0.58 years-1). The population of S. intermedius was more vulnerable to fishing (F = 2.90 years-1) than S. mandibularis (F = 0.51 years-1). The Z/K ratio (Z/K = 2.65 for S. mandibularis; Z/K = 4.85 for S. intermedius) indicated that mortality was predominant over growth for the two species. The recruitment pattern showed one Gauss curve translates was continuous for each species. For S. mandibularis, the exploitation rate (E = 0.47) was close to E 0.1 (E 0.1 = 0.46), indicating that S. mandibularis’s stock was in an optimum state of exploitation. However, for S. intermedius, Emax was lower (Emax = 0.57) than the exploitation rate (E = 0.77). This result reflected overexploitation of this species. \u0000 \u0000 Key words: Schilbe mandibularis, Schilbe intermedius, mortality, recruitment, exploitation, Aghien Lagoon.","PeriodicalId":415026,"journal":{"name":"International Journal of Fisheries and Aquaculture","volume":"81 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125215219","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
R. Makwinja, W. Singini, E. Kaunda, F. Kapute, M. M'balaka
Lake Malawi continues experiencing serious depletion of most valuable fish species. Presently, commercial and artisanal fishery are forced to target less valuable fish species. Evidently, economic importance of Engraulicypris sardella in Malawi cannot be negated as it currently contributes over 70% of the total annual landings. However, such highest contribution could be a sign of harvesting pressure. Therefore, as the species continues being increasingly exploited, the development of scientific understanding through application of stochastic models is particularly relevant for present and future policy making and formulation of strategies to sustain the resource in the lake. Thus, the study was designed to forecast the annual catch trend of E. sardella from Lake Malawi. The study used time series data from 1976 to 2015 period obtained from Monkey Bay Fisheries Research Station of the Malawi Fisheries Department. The study adopted Box-Jenkins procedures to identify appropriate Autoregressive Integrated Moving Average (ARIMA) model, estimate parameters in ARIMA model and conducting diagnostic check. The study findings showed that ARIMA (2,1,1) model had least Normalized Bayesian Information Criterion (NBIC) value making it a appropriate model for the study. ARIMA (2,1,1) model showed that E. sardella annual catches are positively fluctuating. Again, the model predicted that E. sardella annual catches from Lake Malawi will increase from the annual total landings of 71,778.47 metric tons to 104,261.20 metric tons in the next 10 years (ceteris paribus). Key words: Box-Jenkins, Engraulicypris sardella, Lake Malawi, autoregressive integrated moving average (ARIMA), Modelling, Usipa, Stochastic.
{"title":"Stochastic modelling of Lake Malawi Engraulicypris sardella (Gunther, 1868) catch fluctuation","authors":"R. Makwinja, W. Singini, E. Kaunda, F. Kapute, M. M'balaka","doi":"10.5897/IJFA2017.0642","DOIUrl":"https://doi.org/10.5897/IJFA2017.0642","url":null,"abstract":"Lake Malawi continues experiencing serious depletion of most valuable fish species. Presently, commercial and artisanal fishery are forced to target less valuable fish species. Evidently, economic importance of Engraulicypris sardella in Malawi cannot be negated as it currently contributes over 70% of the total annual landings. However, such highest contribution could be a sign of harvesting pressure. Therefore, as the species continues being increasingly exploited, the development of scientific understanding through application of stochastic models is particularly relevant for present and future policy making and formulation of strategies to sustain the resource in the lake. Thus, the study was designed to forecast the annual catch trend of E. sardella from Lake Malawi. The study used time series data from 1976 to 2015 period obtained from Monkey Bay Fisheries Research Station of the Malawi Fisheries Department. The study adopted Box-Jenkins procedures to identify appropriate Autoregressive Integrated Moving Average (ARIMA) model, estimate parameters in ARIMA model and conducting diagnostic check. The study findings showed that ARIMA (2,1,1) model had least Normalized Bayesian Information Criterion (NBIC) value making it a appropriate model for the study. ARIMA (2,1,1) model showed that E. sardella annual catches are positively fluctuating. Again, the model predicted that E. sardella annual catches from Lake Malawi will increase from the annual total landings of 71,778.47 metric tons to 104,261.20 metric tons in the next 10 years (ceteris paribus). \u0000 \u0000 Key words: Box-Jenkins, Engraulicypris sardella, Lake Malawi, autoregressive integrated moving average (ARIMA), Modelling, Usipa, Stochastic.","PeriodicalId":415026,"journal":{"name":"International Journal of Fisheries and Aquaculture","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126956090","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Stella Agyemang Duah, G. Emi-Reynolds, P. Kumah, D. Larbi
The effect of irradiation on microbial load and shelf-life of anchovies (Engraulis encrasicolus) was assessed in this study. Irradiation doses used in the study were 2.5, 5.0, 7.5 and 10 kGy. The assessment was carried out at 3 weeks intervals for the period of 9 weeks. Samples were analyzed for microbial load (total viable count, total coliform count and Staphylococcus aureus). Smoked samples were more contaminated as compared to sun-dried samples from both locations. A dose dependent effect was observed in all the samples obtained from both Chorkor and Keta (p<0.05). Samples from Keta were less contaminated for both smoked and sundried samples as compared to the samples from Chorkor whether sun dried or smoked (p<0.05). At 2.5 kGy, microbial load levels (CFU/g) for total viable count, total coliform count and S. aureus were below the standard (CFU/g of microbial load) set by the Ghana Standards Authority for microbial load in fish. This dose is the most appropriate dose for the decontamination and shelf extension of anchovy from Ghana. Key words: Microbial load, processing methods, irradiation dose, shelf-life.
{"title":"Effect of gamma irradiation on the microbiological quality and shelf life of Engraulis encrasicolus in Ghana","authors":"Stella Agyemang Duah, G. Emi-Reynolds, P. Kumah, D. Larbi","doi":"10.5897/IJFA2017.0656","DOIUrl":"https://doi.org/10.5897/IJFA2017.0656","url":null,"abstract":"The effect of irradiation on microbial load and shelf-life of anchovies (Engraulis encrasicolus) was assessed in this study. Irradiation doses used in the study were 2.5, 5.0, 7.5 and 10 kGy. The assessment was carried out at 3 weeks intervals for the period of 9 weeks. Samples were analyzed for microbial load (total viable count, total coliform count and Staphylococcus aureus). Smoked samples were more contaminated as compared to sun-dried samples from both locations. A dose dependent effect was observed in all the samples obtained from both Chorkor and Keta (p<0.05). Samples from Keta were less contaminated for both smoked and sundried samples as compared to the samples from Chorkor whether sun dried or smoked (p<0.05). At 2.5 kGy, microbial load levels (CFU/g) for total viable count, total coliform count and S. aureus were below the standard (CFU/g of microbial load) set by the Ghana Standards Authority for microbial load in fish. This dose is the most appropriate dose for the decontamination and shelf extension of anchovy from Ghana. \u0000 \u0000 Key words: Microbial load, processing methods, irradiation dose, shelf-life.","PeriodicalId":415026,"journal":{"name":"International Journal of Fisheries and Aquaculture","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127610481","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The study assessed consumers’ preference and perception of smoke-dried white shrimps in Igbokoda, a coastal area of Ondo State, Nigeria. The community was purposively chosen because the town is a major cluster for natives from coastal communities in Ilaje and Ese-Odo LGAs of Ondo State, Nigeria. Forty shrimp consumers (20 males and 20 females) were randomly selected for this study. They assessed the sensory properties of smoke-dried shrimps collected from processing units in Ayetoro and Bijimi. The two communities were purposively chosen for the predominance of white shrimp processing using smoking method. Five smoke-dried samples (A1-A5 and B1-B5) were collected from Ayetoro and Bijimi respectively. Panelists assessed the sensory attributes of white shrimps using a 9-point hedonic scale. Results indicated that there were significant differences (p ≤ 0.05) in the organoleptic properties of the white shrimps. Samples A3, B2 and B3 had low acceptability while samples A1 and B5 were more accepted than the other samples. Taste of the samples was the highest significant factor that influenced general acceptability among assessors as indicated by the magnitude of its t-Stat. All the sensory attributes were positively correlated (R = 0.71) with general acceptability and 50% (R2 = 0.50) dependent on these sensory attributes. Majority of the respondents said they consumed white shrimps with no allergic reactions in dried form. Consumers were highly satisfied with smoked white shrimps in market places; however, off flavour, inadequate taste, odd appearance and the quantity of by-catches were the perceived reasons that determined consumers’ satisfaction with shrimps in the market outlets. Hence, more emphasis should be laid on reducing off flavour, odd appearance, by-catches and increased utilization of white shrimp in food products. This would further increase consumers’ satisfaction, patronage in market places, boost coastal economy and contribute to healthy living of consumers in Nigeria. Key words: Consumers, preference, sensory attributes, perception, white shrimp, coastal areas.
{"title":"Consumers preference and perception of smoke-dried white shrimp (Nematopalaemon hastatus) in coastal areas of Ondo State, Nigeria","authors":"B. P. Omobepade, O. T. Adebayo, T. Amos","doi":"10.5897/ijfa2017.0661","DOIUrl":"https://doi.org/10.5897/ijfa2017.0661","url":null,"abstract":"The study assessed consumers’ preference and perception of smoke-dried white shrimps in Igbokoda, a coastal area of Ondo State, Nigeria. The community was purposively chosen because the town is a major cluster for natives from coastal communities in Ilaje and Ese-Odo LGAs of Ondo State, Nigeria. Forty shrimp consumers (20 males and 20 females) were randomly selected for this study. They assessed the sensory properties of smoke-dried shrimps collected from processing units in Ayetoro and Bijimi. The two communities were purposively chosen for the predominance of white shrimp processing using smoking method. Five smoke-dried samples (A1-A5 and B1-B5) were collected from Ayetoro and Bijimi respectively. Panelists assessed the sensory attributes of white shrimps using a 9-point hedonic scale. Results indicated that there were significant differences (p ≤ 0.05) in the organoleptic properties of the white shrimps. Samples A3, B2 and B3 had low acceptability while samples A1 and B5 were more accepted than the other samples. Taste of the samples was the highest significant factor that influenced general acceptability among assessors as indicated by the magnitude of its t-Stat. All the sensory attributes were positively correlated (R = 0.71) with general acceptability and 50% (R2 = 0.50) dependent on these sensory attributes. Majority of the respondents said they consumed white shrimps with no allergic reactions in dried form. Consumers were highly satisfied with smoked white shrimps in market places; however, off flavour, inadequate taste, odd appearance and the quantity of by-catches were the perceived reasons that determined consumers’ satisfaction with shrimps in the market outlets. Hence, more emphasis should be laid on reducing off flavour, odd appearance, by-catches and increased utilization of white shrimp in food products. This would further increase consumers’ satisfaction, patronage in market places, boost coastal economy and contribute to healthy living of consumers in Nigeria. \u0000 \u0000 Key words: Consumers, preference, sensory attributes, perception, white shrimp, coastal areas.","PeriodicalId":415026,"journal":{"name":"International Journal of Fisheries and Aquaculture","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114372064","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Morphometric relationships of African big barb, Labeobarbus intermedius (Ruppell, 1836) (Pisces: Cyprinidae) in Lake Koka, Ethiopia was studied based on the total number of 266 adult fish samples collected in April-May and July-August 2011. Fish ranging from 23.3 to 49.0 cm in total length (35±4.1 cm) and from 95.4 to 1200 g in total weight (434.4±206.5 g) were randomly sampled. Of these, 55.6% (n=148) were males and 44.4% (n=118) were females. The length-weight relationship of the males, females and combined fish were curvilinear and statistically significant (P 0.01). Length-length relationships between total length (TL) and fork length (FL), fork length (FL) and standard length (SL), TL and SL were linear and statistically significant (P 0.01). The overall condition factor for all sampling period was 1.0. Key words: Allometric growth, Labeobarbus intermedius, condition factor, Lake Koka, length-weight relationship.
{"title":"Morphometric relationships of African big barb, Labeobarbus intermedius (Rppell, 1836) in Lake Koka, Ethiopia","authors":"Agumassie Tesfahun, E. Dadebo, M. Temesgen","doi":"10.5897/IJFA2016.0652","DOIUrl":"https://doi.org/10.5897/IJFA2016.0652","url":null,"abstract":"Morphometric relationships of African big barb, Labeobarbus intermedius (Ruppell, 1836) (Pisces: Cyprinidae) in Lake Koka, Ethiopia was studied based on the total number of 266 adult fish samples collected in April-May and July-August 2011. Fish ranging from 23.3 to 49.0 cm in total length (35±4.1 cm) and from 95.4 to 1200 g in total weight (434.4±206.5 g) were randomly sampled. Of these, 55.6% (n=148) were males and 44.4% (n=118) were females. The length-weight relationship of the males, females and combined fish were curvilinear and statistically significant (P 0.01). Length-length relationships between total length (TL) and fork length (FL), fork length (FL) and standard length (SL), TL and SL were linear and statistically significant (P 0.01). The overall condition factor for all sampling period was 1.0. \u0000 \u0000 \u0000 \u0000 Key words: Allometric growth, Labeobarbus intermedius, condition factor, Lake Koka, length-weight relationship.","PeriodicalId":415026,"journal":{"name":"International Journal of Fisheries and Aquaculture","volume":"99 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123314812","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Okoye C. Loveline, P. Samuel, Francis Ofurum Arimoro, A. Ayanwale, Y. I. Auta, A. Muhammed
The effects of Lead Nitrate on catalase (CAT) production levels in post juvenile Clarias gariepinus were investigated. A total of 250 samples of the fish were acclimatized for two week. Six samples of the fish were exposed to the sub-lethal concentrations of 00, 28, 43 and 57 mg/L with replicate in each case for 28 days. Two samples of the fish were randomly selected from the treatments and control for the bioassay of catalase on the 14th and 28th day respectively. The fish organs (kidney, liver and gill) were excised from the fish and homogenized in sodium phosphate buffer (0.2 M, pH 8.0). The data generated were subjected to one-way analysis of variance followed by Duncan Multiple Range test where significant. The results showed that 96 h LC50 of C. gariepinus exposed to lethal concentrations of Lead Nitrate was 284.189 mg/L. The CAT production levels were significantly higher in the kidney of the fish exposed in 28 mg/L on day 14; 43 and 57 mg/L on day 28, respectively. The CAT production levels were significantly higher in the gill of the fish exposed in 57 mg/L on day 14; 43 and 57 mg/L on day 28 respectively. The CAT production levels were significantly higher in the liver of the fish exposed in 28 and 57 mg/L on day 14 respectively. The highest production mean values of 149.55±43.65 and 152.80±40.40 U/mgprotein were obtained in the kidney of the fish exposed in 57 and 43 mg/L, respectively. Therefore, the kidney of the fish exhibited a better control of the toxicant and as such, catalase production level in this organ should be used in assessing the level of physiological changes in the fish. Key words: Catalase, Lead Nitrate, oxidative stress, Clarias gariepinus, LC50.
研究了硝酸铅对加里平Clarias gariepinus幼鱼后过氧化氢酶(CAT)产量的影响。总共250条鱼的样本被驯化了两周。6个样本分别暴露于0、28、43和57 mg/L的亚致死浓度下，每组重复28天。分别于第14天和第28天在处理组和对照组中随机抽取2只鱼进行过氧化氢酶的生物测定。取鱼的器官(肾、肝和鳃)，在0.2 M, pH 8.0的磷酸钠缓冲液中均质。产生的数据进行单向方差分析，然后进行Duncan多元范围检验，其中显著。结果表明，硝态铅致死浓度对加里乙螺旋体的96 h LC50为284.189 mg/L;在28 mg/L剂量下，第14天鱼肾中CAT产量显著升高;第28天分别为43和57 mg/L。在57 mg/L剂量下，第14天鱼鳃中CAT产量显著升高;第28天分别为43和57 mg/L。第14天，28 mg/L和57 mg/L剂量暴露的鱼肝脏中CAT产量显著高于对照组。57 mg/L和43 mg/L暴露的鱼的肾脏蛋白质产量最高，分别为149.55±43.65和152.80±40.40 U/mg。因此，鱼的肾脏表现出对毒物更好的控制，因此，该器官中过氧化氢酶的产生水平应用于评估鱼的生理变化水平。关键词:过氧化氢酶;硝酸铅;氧化应激;
{"title":"Effects of Lead Nitrate on catalase production levels in post juvenile Clarias gariepinus (Burchell, 1822)","authors":"Okoye C. Loveline, P. Samuel, Francis Ofurum Arimoro, A. Ayanwale, Y. I. Auta, A. Muhammed","doi":"10.5897/IJFA2016.0611","DOIUrl":"https://doi.org/10.5897/IJFA2016.0611","url":null,"abstract":"The effects of Lead Nitrate on catalase (CAT) production levels in post juvenile Clarias gariepinus were investigated. A total of 250 samples of the fish were acclimatized for two week. Six samples of the fish were exposed to the sub-lethal concentrations of 00, 28, 43 and 57 mg/L with replicate in each case for 28 days. Two samples of the fish were randomly selected from the treatments and control for the bioassay of catalase on the 14th and 28th day respectively. The fish organs (kidney, liver and gill) were excised from the fish and homogenized in sodium phosphate buffer (0.2 M, pH 8.0). The data generated were subjected to one-way analysis of variance followed by Duncan Multiple Range test where significant. The results showed that 96 h LC50 of C. gariepinus exposed to lethal concentrations of Lead Nitrate was 284.189 mg/L. The CAT production levels were significantly higher in the kidney of the fish exposed in 28 mg/L on day 14; 43 and 57 mg/L on day 28, respectively. The CAT production levels were significantly higher in the gill of the fish exposed in 57 mg/L on day 14; 43 and 57 mg/L on day 28 respectively. The CAT production levels were significantly higher in the liver of the fish exposed in 28 and 57 mg/L on day 14 respectively. The highest production mean values of 149.55±43.65 and 152.80±40.40 U/mgprotein were obtained in the kidney of the fish exposed in 57 and 43 mg/L, respectively. Therefore, the kidney of the fish exhibited a better control of the toxicant and as such, catalase production level in this organ should be used in assessing the level of physiological changes in the fish. \u0000 \u0000 \u0000 \u0000 Key words: Catalase, Lead Nitrate, oxidative stress, Clarias gariepinus, LC50.","PeriodicalId":415026,"journal":{"name":"International Journal of Fisheries and Aquaculture","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115736443","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
H. A. Yao, R. A. Koumi, C. B. Atse, P. E. Kouamelan, P. Kouamé
This study was undertaken in the main Cote d’Ivoire fish farming production regions. Fish farming were surveyed on the basis of socio-economic characteristics of fish farmers, farming practices and production depending to the systems. Results show that majority of fish farmers used semi intensive (51.8%) and extensive (42.9%) systems. Intensive system represented only 1.3% and rice-fish system 4.0% of fish farms. Tilapia, Heterotis and Catfish were the most species reared with frequencies depending to the system. In intensive system, rearing structures were tanks and floating cages and farms owner were native (50%) economic operator (75%) or salaried (25%). In contrast, in semi intensive systems, the popular rearing structures were earthen ponds (68.6%), and farms belong to native (61.5%) farmers (46.3%). Extensive and rice fish farming used earthen ponds associated to dams (52.7-66.7%) and 45.7-50% of proprietary were allochthonous famers (77.5-91.7%). Imported (50%) and national commercial feeds (50%) were used in intensive system. In semi intensive system, national commercial feeds (55.13%), agro-industrial byproducts (46.79%) and feeds produced by fish farmers (33.97%) were largely used while agro-industrial byproducts and/or non-conventional feeds were used in extensive and rice-fish system to feed fish. The average farm production of semi intensive and extensive systems most practiced varied between 395.25 and 2937.12 kg/year. The results suggest that optimization of the Ivorian fish farming production need the adoption of appropriate production practices. They also emphasize the need to promote the intensive and semi intensive systems to increasing marketable fish production. Key words: Fish farming, System, socio-economic, farming practices, production.
{"title":"Cte dIvoire aquaculture systems perception: Characteristics and influence on national fish production","authors":"H. A. Yao, R. A. Koumi, C. B. Atse, P. E. Kouamelan, P. Kouamé","doi":"10.5897/IJFA2017.0640","DOIUrl":"https://doi.org/10.5897/IJFA2017.0640","url":null,"abstract":"This study was undertaken in the main Cote d’Ivoire fish farming production regions. Fish farming were surveyed on the basis of socio-economic characteristics of fish farmers, farming practices and production depending to the systems. Results show that majority of fish farmers used semi intensive (51.8%) and extensive (42.9%) systems. Intensive system represented only 1.3% and rice-fish system 4.0% of fish farms. Tilapia, Heterotis and Catfish were the most species reared with frequencies depending to the system. In intensive system, rearing structures were tanks and floating cages and farms owner were native (50%) economic operator (75%) or salaried (25%). In contrast, in semi intensive systems, the popular rearing structures were earthen ponds (68.6%), and farms belong to native (61.5%) farmers (46.3%). Extensive and rice fish farming used earthen ponds associated to dams (52.7-66.7%) and 45.7-50% of proprietary were allochthonous famers (77.5-91.7%). Imported (50%) and national commercial feeds (50%) were used in intensive system. In semi intensive system, national commercial feeds (55.13%), agro-industrial byproducts (46.79%) and feeds produced by fish farmers (33.97%) were largely used while agro-industrial byproducts and/or non-conventional feeds were used in extensive and rice-fish system to feed fish. The average farm production of semi intensive and extensive systems most practiced varied between 395.25 and 2937.12 kg/year. The results suggest that optimization of the Ivorian fish farming production need the adoption of appropriate production practices. They also emphasize the need to promote the intensive and semi intensive systems to increasing marketable fish production. \u0000 \u0000 \u0000 \u0000 Key words: Fish farming, System, socio-economic, farming practices, production.","PeriodicalId":415026,"journal":{"name":"International Journal of Fisheries and Aquaculture","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128072140","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A. Kefi, S. Cole, Alexander M. Kaminski, A. Ward, N. L. Mkandawire
The study was conducted in three districts of Western Province of Zambia namely; Mongu, Nalolo and Senanga that lie along the Zambezi River in the Barotse Floodplain. The study employed two main data tools aimed at understanding the extent of post-harvest losses in the fishing, processing and trading nodes in the fish value chain study sites. The tools were the Exploratory Fish Loss Assessment Method (EFLAM) study and a Quantitative Loss Assessment Method (QLAM) survey. The study found that physical fish losses occur at three nodes in the value chain and differ significantly (P 0.05) from the fish lost at trading node. The major cause of physical loss was found to be breakages at processing and trading nodes. There is need to introduce improved processing technologies that can reduce breakages. Furthermore, economic and nutrient losses should also be profiled to fully understand the total losses that occur within the Barotse Floodplain fish value chain. Key words: Fish, physical losses, fishing, processing, trading.
{"title":"Physical losses of fish along the value chain in Zambia: A case study of Barotse Floodplain","authors":"A. Kefi, S. Cole, Alexander M. Kaminski, A. Ward, N. L. Mkandawire","doi":"10.5897/ijfa2017.0638","DOIUrl":"https://doi.org/10.5897/ijfa2017.0638","url":null,"abstract":"The study was conducted in three districts of Western Province of Zambia namely; Mongu, Nalolo and Senanga that lie along the Zambezi River in the Barotse Floodplain. The study employed two main data tools aimed at understanding the extent of post-harvest losses in the fishing, processing and trading nodes in the fish value chain study sites. The tools were the Exploratory Fish Loss Assessment Method (EFLAM) study and a Quantitative Loss Assessment Method (QLAM) survey. The study found that physical fish losses occur at three nodes in the value chain and differ significantly (P 0.05) from the fish lost at trading node. The major cause of physical loss was found to be breakages at processing and trading nodes. There is need to introduce improved processing technologies that can reduce breakages. Furthermore, economic and nutrient losses should also be profiled to fully understand the total losses that occur within the Barotse Floodplain fish value chain. \u0000 \u0000 Key words: Fish, physical losses, fishing, processing, trading.","PeriodicalId":415026,"journal":{"name":"International Journal of Fisheries and Aquaculture","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114947104","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This study was conducted to assess some physico-chemical properties and yields of two micro dams (Korrir and Laelay Wukro) located in eastern zones of Tigray region (Northern Ethiopia). In each location, water samples and fish yield were examined from October 2013 to March 2014 once per month in each dams. The examined physico-chemical parameters were: Dissolved oxygen (DO), electrical conductivity (EC), total dissolved solids (TDS), water temperature, pH and transparency. The result showed that the monthly record values of DO, EC and TDS decreased while water temperature and transparency increased in studied months. Mean monthly pH value also fluctuated across months. The monthly mean value of DO, pH, temperature, EC, TDS and transparency were ranged: 3.20-7.70 mg/L, 8.23-9.14, 15.3-22.2°C, 284-353 µS/cm, 1.47-2.11 mg/L and 19.00-39.00 cm in Korrir dam while in Laelay Wukro were: 3.44-5.70 mg/L, 7.93-8.61, 19.4-24.2°C, 209-462 mg/L, 110-270 µS/cm and 18.00-40.20 cm, respectively. Fish yield was assessed by morphoedaphic index empirical models. There was no significant (p<0.05) difference in fish yield and the average estimated productivity of Korrir and Laelay Wukro dams were 13.99 and 14.47 quintal/ha/year respectively. Therefore physico-chemical properties of these micro dams were good for fish production and fish farmers should practice utilization of the micro dams through good management of the water bodies. Key words: Physico-chemical properties, fish yields, micro dams, morphoedaphic index.
{"title":"Assessment of monthly physico-chemical properties and fish yields of two micro dams of Tigray Region, Northern Ethiopia","authors":"H. Zebib, T. Teame","doi":"10.5897/IJFA2016.0600","DOIUrl":"https://doi.org/10.5897/IJFA2016.0600","url":null,"abstract":"This study was conducted to assess some physico-chemical properties and yields of two micro dams (Korrir and Laelay Wukro) located in eastern zones of Tigray region (Northern Ethiopia). In each location, water samples and fish yield were examined from October 2013 to March 2014 once per month in each dams. The examined physico-chemical parameters were: Dissolved oxygen (DO), electrical conductivity (EC), total dissolved solids (TDS), water temperature, pH and transparency. The result showed that the monthly record values of DO, EC and TDS decreased while water temperature and transparency increased in studied months. Mean monthly pH value also fluctuated across months. The monthly mean value of DO, pH, temperature, EC, TDS and transparency were ranged: 3.20-7.70 mg/L, 8.23-9.14, 15.3-22.2°C, 284-353 µS/cm, 1.47-2.11 mg/L and 19.00-39.00 cm in Korrir dam while in Laelay Wukro were: 3.44-5.70 mg/L, 7.93-8.61, 19.4-24.2°C, 209-462 mg/L, 110-270 µS/cm and 18.00-40.20 cm, respectively. Fish yield was assessed by morphoedaphic index empirical models. There was no significant (p<0.05) difference in fish yield and the average estimated productivity of Korrir and Laelay Wukro dams were 13.99 and 14.47 quintal/ha/year respectively. Therefore physico-chemical properties of these micro dams were good for fish production and fish farmers should practice utilization of the micro dams through good management of the water bodies. \u0000 \u0000 \u0000 \u0000 Key words: Physico-chemical properties, fish yields, micro dams, morphoedaphic index.","PeriodicalId":415026,"journal":{"name":"International Journal of Fisheries and Aquaculture","volume":"485 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124415481","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Comparison of heavy metal levels in Oreochromis niloticus and Chrysichthys nigrodigitatus caught in Ogun River (Nigeria) was carried out to reveal the potential health risks associated with fish consumption from the river. Concentrations of copper, lead and cadmium were determined in the gills, eyes, bone, flesh, liver and stomach of the fish species. Ten fish of each species were obtained commercially and analyzed for the metals using Atomic Absorption Spectrophotometer. Data obtained were subjected to one-way analysis of variance (ANOVA) at 5% significant level. The highest concentrations of Cu were observed in the gills of O. niloticus and the eyes followed by liver of C. nigrodigitatus, while the lowest concentrations were detected in the eyes of O. niloticus and bone of C. nigrodigitatus. Lead concentrations were higher in the liver of O. niloticus and gills of C. nigrodigitatus, while the lowest concentrations were detected in stomach of O. niloticus and C. nigrodigitatus respectively. Also, in proximate analysis, composition of dry matter, crude protein, crude fat, ash and carbohydrate contents recorded high in C. nigrodigitatus and O. niloticus and significantly differs. All the metals studied exceeded standard permissible limit for human consumption. Therefore, monitoring of the river is highly recommended, while adequate information, education and training should be strengthened to control further pollution. Key words: Freshwater fish, Africa, contamination, Nile tilapia, catfish.
{"title":"Determination of heavy metal levels in Oreochromis niloticus and Chrysichthys nigrodigitatus from Ogun River, Nigeria","authors":"O. Fafioye, R. Oladunjoye, T. Bamidele, T. Ige","doi":"10.5897/IJFA2015.0491","DOIUrl":"https://doi.org/10.5897/IJFA2015.0491","url":null,"abstract":"Comparison of heavy metal levels in Oreochromis niloticus and Chrysichthys nigrodigitatus caught in Ogun River (Nigeria) was carried out to reveal the potential health risks associated with fish consumption from the river. Concentrations of copper, lead and cadmium were determined in the gills, eyes, bone, flesh, liver and stomach of the fish species. Ten fish of each species were obtained commercially and analyzed for the metals using Atomic Absorption Spectrophotometer. Data obtained were subjected to one-way analysis of variance (ANOVA) at 5% significant level. The highest concentrations of Cu were observed in the gills of O. niloticus and the eyes followed by liver of C. nigrodigitatus, while the lowest concentrations were detected in the eyes of O. niloticus and bone of C. nigrodigitatus. Lead concentrations were higher in the liver of O. niloticus and gills of C. nigrodigitatus, while the lowest concentrations were detected in stomach of O. niloticus and C. nigrodigitatus respectively. Also, in proximate analysis, composition of dry matter, crude protein, crude fat, ash and carbohydrate contents recorded high in C. nigrodigitatus and O. niloticus and significantly differs. All the metals studied exceeded standard permissible limit for human consumption. Therefore, monitoring of the river is highly recommended, while adequate information, education and training should be strengthened to control further pollution. \u0000 \u0000 \u0000 \u0000 Key words: Freshwater fish, Africa, contamination, Nile tilapia, catfish.","PeriodicalId":415026,"journal":{"name":"International Journal of Fisheries and Aquaculture","volume":"36 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114052123","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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