The study evaluated nutritional and organoleptic properties of Clarias gariepinus pre-treated with aqueous leave extracts of Ocimum gratissimum and Vernonia amygdalina before processing. Thirty-six (36) C. gariepinus (live weight = 1.2± 0.2kg) samples were procured and processed for the study. Fish samples were divided into three parts of twelve fish each. Each part was grouped into three treatments having four fish in each group using a completely randomized design. Treatment one (T1) had fish immersed in 5% brine without herbal extract (control). In Treatment two (T2), fish were soaked in mixture of 5% brine and 5% O. gratissium (scent leaf) extracts while Treatment three (T3) had fish soaked in mixture of 5% brine and 5% V. amygdalina (bitter leaf) extracts all for 30 minutes. Treated fish samples were smoke-dried using charcoal kiln for 5 hours at temperature of 80 – 90° C. Samples were then cooled under ambient condition (30+3oC) for 4 hours. The smoke-dried fish samples were labeled according to treatments and stored for 7 days under aseptic condition. Organoleptic properties of the samples were conducted at every 24-hour of storage using a 9-point hedonic scale. Mean values of proximate composition of samples were significantly different (p<0.05). Protein content (70.01%) in T3 was higher than 68.31% and 66.62% in T2 and T1 respectively. Similarly, fat (5.12%) and ash (4.68%) levels for T3 were higher than 4.85% and 4.46% fat with 4.36% and 3.98% ash contents for T2 and T1 respectively. Results of mean scores for each organoleptic property decreased significantly (p<0.05) during storage period with no consistent trend in score pattern. Keywords: Clarias gariepinus, extract pretreatment, Ocimum gratissimum, organoleptic, Vernonia amygdalina.
{"title":"Effects of pre-treatment with extracts of Ocimum gratissimum and Vermonia amygdalina on proximate and organoleptic properties of processed Clarias gariepinus (Burchell, 1822)","authors":"S. A. Ojukannaiye, L. Agbabiaka, I. Adedokun","doi":"10.4314/jas.v35i1.5","DOIUrl":"https://doi.org/10.4314/jas.v35i1.5","url":null,"abstract":"The study evaluated nutritional and organoleptic properties of Clarias gariepinus pre-treated with aqueous leave extracts of Ocimum gratissimum and Vernonia amygdalina before processing. Thirty-six (36) C. gariepinus (live weight = 1.2± 0.2kg) samples were procured and processed for the study. Fish samples were divided into three parts of twelve fish each. Each part was grouped into three treatments having four fish in each group using a completely randomized design. Treatment one (T1) had fish immersed in 5% brine without herbal extract (control). In Treatment two (T2), fish were soaked in mixture of 5% brine and 5% O. gratissium (scent leaf) extracts while Treatment three (T3) had fish soaked in mixture of 5% brine and 5% V. amygdalina (bitter leaf) extracts all for 30 minutes. Treated fish samples were smoke-dried using charcoal kiln for 5 hours at temperature of 80 – 90° C. Samples were then cooled under ambient condition (30+3oC) for 4 hours. The smoke-dried fish samples were labeled according to treatments and stored for 7 days under aseptic condition. Organoleptic properties of the samples were conducted at every 24-hour of storage using a 9-point hedonic scale. Mean values of proximate composition of samples were significantly different (p<0.05). Protein content (70.01%) in T3 was higher than 68.31% and 66.62% in T2 and T1 respectively. Similarly, fat (5.12%) and ash (4.68%) levels for T3 were higher than 4.85% and 4.46% fat with 4.36% and 3.98% ash contents for T2 and T1 respectively. Results of mean scores for each organoleptic property decreased significantly (p<0.05) during storage period with no consistent trend in score pattern. \u0000Keywords: Clarias gariepinus, extract pretreatment, Ocimum gratissimum, organoleptic, Vernonia amygdalina.","PeriodicalId":32064,"journal":{"name":"Turkish Journal of Aquatic Sciences","volume":"53 1","pages":"39-46"},"PeriodicalIF":0.0,"publicationDate":"2020-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89947925","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}
L. Agbabiaka, I. Adedokun, S. A. Ojukannaye, D. C. Agbai
Chemical assessment of Polycyclic Aromatic Hydrocarbons (PAHs) on processed African catfish was carried out. Fish samples were processed using charcoal, firewood and gas oven following standard procedures. Gas chromatographic analysis was employed for PAHs determination. Results showed that mean PAHs concentrations in fish samples were observed to be: 737.86ng/μl in firewood-smoked samples, 1451.82ng/μl in charcoal and 1990.23ng/μl in oven-dried fish. The highest mean concentration of PAHs was 906.93±0.01 ng/μl for pyrene from the charcoal-smoked samples. Lower molecular weight PAHs were generally dominant in tested samples. The number of PAHs ring showed significant variation (p<0.05) with respect to processing methods. Inference from the results showed that differently processed fish samples were of good quality and are suitable for human consumption. However, the charcoal processed samples appeared to be the best when considering the case of incomplete combustion of the wood during the drying process. Therefore, the use of charcoal in fish processing is hereby recommended. Also, it is suggested that fish processors be trained on the appropriate handling and processing methods to adopt in order to enhance the production of high-quality contaminants-free fish products. Keywords: Polycyclic Aromatic Hydrocarbon (PAH), anthropogenic, combustion, smoking methods, contaminants.
{"title":"Chemical assessment of Polycyclic Aromatic Hydrocarbons (PAHs) on processed Clarias gariepinus (Burchell, 1822) from different energy sources","authors":"L. Agbabiaka, I. Adedokun, S. A. Ojukannaye, D. C. Agbai","doi":"10.4314/jas.v35i1.8","DOIUrl":"https://doi.org/10.4314/jas.v35i1.8","url":null,"abstract":"Chemical assessment of Polycyclic Aromatic Hydrocarbons (PAHs) on processed African catfish was carried out. Fish samples were processed using charcoal, firewood and gas oven following standard procedures. Gas chromatographic analysis was employed for PAHs determination. Results showed that mean PAHs concentrations in fish samples were observed to be: 737.86ng/μl in firewood-smoked samples, 1451.82ng/μl in charcoal and 1990.23ng/μl in oven-dried fish. The highest mean concentration of PAHs was 906.93±0.01 ng/μl for pyrene from the charcoal-smoked samples. Lower molecular weight PAHs were generally dominant in tested samples. The number of PAHs ring showed significant variation (p<0.05) with respect to processing methods. Inference from the results showed that differently processed fish samples were of good quality and are suitable for human consumption. However, the charcoal processed samples appeared to be the best when considering the case of incomplete combustion of the wood during the drying process. Therefore, the use of charcoal in fish processing is hereby recommended. Also, it is suggested that fish processors be trained on the appropriate handling and processing methods to adopt in order to enhance the production of high-quality contaminants-free fish products. \u0000Keywords: Polycyclic Aromatic Hydrocarbon (PAH), anthropogenic, combustion, smoking methods, contaminants.","PeriodicalId":32064,"journal":{"name":"Turkish Journal of Aquatic Sciences","volume":"35 1","pages":"67-72"},"PeriodicalIF":0.0,"publicationDate":"2020-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86466456","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}
Variations in the water quality of the Imo River estuary was investigated by measuring values of selected physico-chemical parameters. Samples were collected bi-monthly between April 2015 and March 2016, covering the dry and wet seasons of the year. Three stations were selected: upstream (Kalibiama), midstream (Opobo) and downstream (Queenstown). Analysis of results showed that physico-chemical parameters were affected more on seasonal than spatial scale. Principal component analysis carried out indicated that values of most of the parameters recorded within the stations clustered together. On the other hand, dispersed values were recorded in months and seasons with significant variations at (p≤0.05) among most parameters. The high spatial variations in phosphates, suspended solids and lead could be associated to human activities like laundry and waste disposal within Opobo and Kalibiama stations. While, high seasonal variability in most parameters could be associated with intense sunshine, cloud cover and tidal intrusion/dilution due to runoff. It can be concluded that nutrient fluxes due to nitrogenous fertilizers are not a problem within the estuary. However, chemical factors and biodegradable components which cause fluctuations in biological oxygen demand are more of the challenge. Keywords: Land-use, nutrient flux, water-quality, pollution, coastal wetlands.
{"title":"Spatial and seasonal variations in physico-chemical parameters of the Imo River Estuary, Niger Delta, Nigeria","authors":"L. E. Obuba, A. Nlewadim, A. Uka","doi":"10.4314/jas.v35i1.4","DOIUrl":"https://doi.org/10.4314/jas.v35i1.4","url":null,"abstract":"Variations in the water quality of the Imo River estuary was investigated by measuring values of selected physico-chemical parameters. Samples were collected bi-monthly between April 2015 and March 2016, covering the dry and wet seasons of the year. Three stations were selected: upstream (Kalibiama), midstream (Opobo) and downstream (Queenstown). Analysis of results showed that physico-chemical parameters were affected more on seasonal than spatial scale. Principal component analysis carried out indicated that values of most of the parameters recorded within the stations clustered together. On the other hand, dispersed values were recorded in months and seasons with significant variations at (p≤0.05) among most parameters. The high spatial variations in phosphates, suspended solids and lead could be associated to human activities like laundry and waste disposal within Opobo and Kalibiama stations. While, high seasonal variability in most parameters could be associated with intense sunshine, cloud cover and tidal intrusion/dilution due to runoff. It can be concluded that nutrient fluxes due to nitrogenous fertilizers are not a problem within the estuary. However, chemical factors and biodegradable components which cause fluctuations in biological oxygen demand are more of the challenge. \u0000Keywords: Land-use, nutrient flux, water-quality, pollution, coastal wetlands.","PeriodicalId":32064,"journal":{"name":"Turkish Journal of Aquatic Sciences","volume":"59 1","pages":"29-38"},"PeriodicalIF":0.0,"publicationDate":"2020-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84612380","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}
Health risk associated with the consumption of contaminated seafood has become of global concern. The study evaluated potential human health risk associated with heavy metal contamination of Tympanotonus fuscatus along Oron water channel Cross River Estuary. The following metals: chromium (Cr), cadmium (Cd), nickel (Ni), lead (Pb) and zinc (Zn) were analyzed using standard procedure. The target hazard quotient (THQ) and cancer risk (TCR) were estimated using USEPA guidelines. Results showed significant differences (p<0.05) in Ni across the sampling period. The principal component analysis (PCA) had 71.2% of the total variance (with PC 1 represented by Ni and Pb and PC 2 dominated by Cd and Zn). The results for THQ and hazard index (HI) were: Cr = 0.95 mg/kg; Ni = 0.12 mg/kg; Zn = 0.16 mg/kg; Cd = 0.06 mg/kg and Pb = 0.69 mg/kg. These values were below the WHO limit of 1.0 mg/kg. This indicated no adverse health effects associated with the consumption of T. fuscatus from the estuary. A high value of TCR (2.15 x 10-3 mg/kg) was recorded for Ni which showed potential ability to induce moderate cancer risk in human over 70 years of consumption. The health risk associated with accumulated metal in tissues of T. fuscatus underscores the need for periodic biomonitoring of the Cross River Estuary. Keywords: Molluscs, Heavy Metal, Risk assessment, Pollution, Cross River Estuary
{"title":"Health risk assessment of heavy metals in Tympanotonus fuscatus along Oron water channel, Cross River Estuary, South Eastern Nigeria","authors":"B. Bassey, E. Nicholas","doi":"10.4314/jas.v35i1.2","DOIUrl":"https://doi.org/10.4314/jas.v35i1.2","url":null,"abstract":"Health risk associated with the consumption of contaminated seafood has become of global concern. The study evaluated potential human health risk associated with heavy metal contamination of Tympanotonus fuscatus along Oron water channel Cross River Estuary. The following metals: chromium (Cr), cadmium (Cd), nickel (Ni), lead (Pb) and zinc (Zn) were analyzed using standard procedure. The target hazard quotient (THQ) and cancer risk (TCR) were estimated using USEPA guidelines. Results showed significant differences (p<0.05) in Ni across the sampling period. The principal component analysis (PCA) had 71.2% of the total variance (with PC 1 represented by Ni and Pb and PC 2 dominated by Cd and Zn). The results for THQ and hazard index (HI) were: Cr = 0.95 mg/kg; Ni = 0.12 mg/kg; Zn = 0.16 mg/kg; Cd = 0.06 mg/kg and Pb = 0.69 mg/kg. These values were below the WHO limit of 1.0 mg/kg. This indicated no adverse health effects associated with the consumption of T. fuscatus from the estuary. A high value of TCR (2.15 x 10-3 mg/kg) was recorded for Ni which showed potential ability to induce moderate cancer risk in human over 70 years of consumption. The health risk associated with accumulated metal in tissues of T. fuscatus underscores the need for periodic biomonitoring of the Cross River Estuary. \u0000Keywords: Molluscs, Heavy Metal, Risk assessment, Pollution, Cross River Estuary","PeriodicalId":32064,"journal":{"name":"Turkish Journal of Aquatic Sciences","volume":"34 1","pages":"10-18"},"PeriodicalIF":0.0,"publicationDate":"2020-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77189615","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 static bioassay experiment was set up to investigate effects of acute (96-hrLC50) concentrations of aqueous leaf extracts of Gongronema latifolium on behaviourial and haematological characteristics of Clarias gariepinus (Burchell, 1822) juveniles. Evaluation of toxicity of leaf extracts at concentrations of: 0, 10, 25, 50, 75, and 100mg/l was done at various time intervals on the fish. A total of 180 catfish juveniles with average initial weight of 8.37±1.36g and total length of 12.10±2.45cm were used. The fish were distributed among the treatments on complete randomized design. Each treatment had three replicates. The results showed that aqueous leaf extracts were toxic to experimental fish. There was an observed erratic movement, colour change from black to ash-brown and dark coloured belly of treated fish. There were slight changes in water quality parameters, with no significant effect (p>0.05) on the tolerance level of fish on G. latifolium leaf extracts. Mean values of 96-hrLC50 were 90.14mg/l and 2.78mg/l for the upper and lower limits while the threshold value was 0.26mg/l. Phyto-chemical analysis of the leaves showed constituents of flavonoids, saponins, tannins, anthrocyanide, alkaloids and glycosides. Effects of aqueous extracts on haematological indices revealed increasing values of pack cell volume, haemoglobin, white blood cell, red blood cell, mean corpuscular volume, mean corpuscular heamoglobin and mean corpuscular heamoglobin concentration counts with extract concentration. Thus, G. latifolium could be used as feed additive for improved fish production at concentration below 70%. Keywords: Gongronema latifolium, leaf extracts, behaviour, haematology, Clarias gariepinus
{"title":"Toxicity of aquaeous leaf extracts of Gongronema latifolium on behaviourial and haematological characteristics of Clarias gariepinus (Burchell, 1822) juveniles","authors":"J. Nwakpa, E. Oti, M. Agim","doi":"10.4314/jas.v35i1.3","DOIUrl":"https://doi.org/10.4314/jas.v35i1.3","url":null,"abstract":"A static bioassay experiment was set up to investigate effects of acute (96-hrLC50) concentrations of aqueous leaf extracts of Gongronema latifolium on behaviourial and haematological characteristics of Clarias gariepinus (Burchell, 1822) juveniles. Evaluation of toxicity of leaf extracts at concentrations of: 0, 10, 25, 50, 75, and 100mg/l was done at various time intervals on the fish. A total of 180 catfish juveniles with average initial weight of 8.37±1.36g and total length of 12.10±2.45cm were used. The fish were distributed among the treatments on complete randomized design. Each treatment had three replicates. The results showed that aqueous leaf extracts were toxic to experimental fish. There was an observed erratic movement, colour change from black to ash-brown and dark coloured belly of treated fish. There were slight changes in water quality parameters, with no significant effect (p>0.05) on the tolerance level of fish on G. latifolium leaf extracts. Mean values of 96-hrLC50 were 90.14mg/l and 2.78mg/l for the upper and lower limits while the threshold value was 0.26mg/l. Phyto-chemical analysis of the leaves showed constituents of flavonoids, saponins, tannins, anthrocyanide, alkaloids and glycosides. Effects of aqueous extracts on haematological indices revealed increasing values of pack cell volume, haemoglobin, white blood cell, red blood cell, mean corpuscular volume, mean corpuscular heamoglobin and mean corpuscular heamoglobin concentration counts with extract concentration. Thus, G. latifolium could be used as feed additive for improved fish production at concentration below 70%. \u0000Keywords: Gongronema latifolium, leaf extracts, behaviour, haematology, Clarias gariepinus","PeriodicalId":32064,"journal":{"name":"Turkish Journal of Aquatic Sciences","volume":"13 1","pages":"19-28"},"PeriodicalIF":0.0,"publicationDate":"2020-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86749669","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}
O. Olapoju, A. Osibona, D. Olayinka, C. A. Edokpayi, O. B. Samuel
The study aimed at mapping and characterizing the benthic communities of Lagos Lagoon based on how the sediment define the distribution of organisms in response to dredging activity of the area. The hydrographic survey of was carried out with the aid of an echo-sounder and side-scan sonar and plotted in ArcGIS 10.3.1. The benthic macroinvertebrate ecology in relation to human activities was defined and studied in ten selected dredged stations. Habitat suitability maps of dominant species were plotted using spatial analyst tool. The removal of organisms with the sediment resulted into increased turbidity, suspended solids and modified sediment characteristics in the study area. The known venus, pachymelania, mangrove, estuarine-amphioplus and estuarine-rock macroinvertebrate communities were intact. However, there were changes in the composition of the communities with Donax acutangulus going into extinction. Multivariate analysis showed that the observed benthic communities and sediment characteristics were sandy in nature. The observed assemblage of organism was mostly dominated by bivalve - Atactodea striata of the family Mesodesmatidae at Ogun river station which was characterised by sand. The results revealed a patchy distribution of organisms having abundant macroinvertebrates with less diversity which may be as a result of the on-going dredging activities in the area. Keywords: Macrobenthos, bathymetry, sediment, dredging, GIS
{"title":"GIS in environmental monitoring and assessment of dredging activites in a perturbed estuarine Lagoon","authors":"O. Olapoju, A. Osibona, D. Olayinka, C. A. Edokpayi, O. B. Samuel","doi":"10.4314/jas.v35i1.1","DOIUrl":"https://doi.org/10.4314/jas.v35i1.1","url":null,"abstract":"The study aimed at mapping and characterizing the benthic communities of Lagos Lagoon based on how the sediment define the distribution of organisms in response to dredging activity of the area. The hydrographic survey of was carried out with the aid of an echo-sounder and side-scan sonar and plotted in ArcGIS 10.3.1. The benthic macroinvertebrate ecology in relation to human activities was defined and studied in ten selected dredged stations. Habitat suitability maps of dominant species were plotted using spatial analyst tool. The removal of organisms with the sediment resulted into increased turbidity, suspended solids and modified sediment characteristics in the study area. The known venus, pachymelania, mangrove, estuarine-amphioplus and estuarine-rock macroinvertebrate communities were intact. However, there were changes in the composition of the communities with Donax acutangulus going into extinction. Multivariate analysis showed that the observed benthic communities and sediment characteristics were sandy in nature. The observed assemblage of organism was mostly dominated by bivalve - Atactodea striata of the family Mesodesmatidae at Ogun river station which was characterised by sand. The results revealed a patchy distribution of organisms having abundant macroinvertebrates with less diversity which may be as a result of the on-going dredging activities in the area. \u0000Keywords: Macrobenthos, bathymetry, sediment, dredging, GIS","PeriodicalId":32064,"journal":{"name":"Turkish Journal of Aquatic Sciences","volume":"1 1","pages":"1-9"},"PeriodicalIF":0.0,"publicationDate":"2020-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81949140","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 comparatively analyzed the general physico-chemical parameters of five different water bodies to assess their suitability for fish production. Four water bodies (Enyigba, Mkpuma, Ameka and Ebonyi) close to quarry sites were selected while the fifth was a culture pond water which served as the control experiment. The water parameters: pH, temperature, dissolved oxygen (DO), free CO2 and transparency were examined using standard methods for 24 months. The results showed that the pattern of temperature variation in all the water bodies examined followed a similar trend with the lowest value observed between December and January. The pond water showed slightly varied pH levels compared to the natural water bodies. The DO contents of Ebonyi, Mkpuma and Enyigba were higher than those recorded from Ameke and pond. Relatively, lower concentrations of free CO2 were recorded in the pond water and Ebonyi river during the harmattan period (December to January) and below the detectable levels. The variation of Sechi disc depth was higher in Enyigba when compared with other water bodies all through the period of the experiment. The trend of transparency was the same in all the water bodies. Keywords: Physico-chemical parameters, natural water bodies, pond water, fish production, Ebonyi State
{"title":"Comparative analysis of physico-chemical parameters of some river systems of Ebonyi State, Nigeria","authors":"M. .. Nwabunike, G. Igwe, I. J. Ochokwu","doi":"10.4314/jas.v34i1.5","DOIUrl":"https://doi.org/10.4314/jas.v34i1.5","url":null,"abstract":"The study comparatively analyzed the general physico-chemical parameters of five different water bodies to assess their suitability for fish production. Four water bodies (Enyigba, Mkpuma, Ameka and Ebonyi) close to quarry sites were selected while the fifth was a culture pond water which served as the control experiment. The water parameters: pH, temperature, dissolved oxygen (DO), free CO2 and transparency were examined using standard methods for 24 months. The results showed that the pattern of temperature variation in all the water bodies examined followed a similar trend with the lowest value observed between December and January. The pond water showed slightly varied pH levels compared to the natural water bodies. The DO contents of Ebonyi, Mkpuma and Enyigba were higher than those recorded from Ameke and pond. Relatively, lower concentrations of free CO2 were recorded in the pond water and Ebonyi river during the harmattan period (December to January) and below the detectable levels. The variation of Sechi disc depth was higher in Enyigba when compared with other water bodies all through the period of the experiment. The trend of transparency was the same in all the water bodies. \u0000Keywords: Physico-chemical parameters, natural water bodies, pond water, fish production, Ebonyi State","PeriodicalId":32064,"journal":{"name":"Turkish Journal of Aquatic Sciences","volume":"451 1","pages":"33-41"},"PeriodicalIF":0.0,"publicationDate":"2020-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85094771","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 evaluated effects of different processing methods (charcoal smoking, electric and gas drying) on proximate composition and stability status in fillets of Clarias gariepinus. The stability indices were evaluated after 60-days storage of the processed fish. Standard methods were employed in all the analyses. The results showed that electric-dried fillets recorded the highest protein content (16.97±0.12%), the lowest water activity (0.49±0.05mg/100g), the highest water resumption (60%) at room temperature and the lowest TVB-N value of 5.0±0.01mg/100g. Proximate analysis revealed that smoked fillets had the lowest protein content of 11.30±0.08%, the highest lipid (6.99±0.15%), the highest water activity 0.71±0.14 and the lowest water resumption at room temperature (36.5%). Fish fillets processed with gas oven had intermediate values of various indices tested when compared with other methods. Keywords: Smoking, electric drying, gas drying, shelf life, proximate composition
{"title":"Influence of processing methods on shelf life and nutritional quality of Clarias gariepinus fillets","authors":"U. Enyidi, F. Joseph","doi":"10.4314/jas.v34i2.17","DOIUrl":"https://doi.org/10.4314/jas.v34i2.17","url":null,"abstract":"The study evaluated effects of different processing methods (charcoal smoking, electric and gas drying) on proximate composition and stability status in fillets of Clarias gariepinus. The stability indices were evaluated after 60-days storage of the processed fish. Standard methods were employed in all the analyses. The results showed that electric-dried fillets recorded the highest protein content (16.97±0.12%), the lowest water activity (0.49±0.05mg/100g), the highest water resumption (60%) at room temperature and the lowest TVB-N value of 5.0±0.01mg/100g. Proximate analysis revealed that smoked fillets had the lowest protein content of 11.30±0.08%, the highest lipid (6.99±0.15%), the highest water activity 0.71±0.14 and the lowest water resumption at room temperature (36.5%). Fish fillets processed with gas oven had intermediate values of various indices tested when compared with other methods. \u0000Keywords: Smoking, electric drying, gas drying, shelf life, proximate composition","PeriodicalId":32064,"journal":{"name":"Turkish Journal of Aquatic Sciences","volume":"80 1","pages":"143-151"},"PeriodicalIF":0.0,"publicationDate":"2020-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76642226","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 importance of fish as food and animal protein for man and livestock, source of income and employment was discussed. The trend in fisheries development is x-rayed, with general characteristics of rural fisheries explained. The problems, constraints and likely solutions were highlighted. Recommendations were made for sustainable fisheries activities in Nigeria. Fisheries business is capable of increasing Nigeria’s Gross Domestic Product (GDP) to solve substantially the country’s unemployment problems and support Federal Government’s agenda on food security for all Nigerians. Keywords: Nigeria fishing industry, artisanal fishery, industrial fishery, aquaculture.
{"title":"Food security: Review of fishery development in Nigeria","authors":"C. Onwuka, S. Ohaturuonye","doi":"10.4314/jas.v34i2.13","DOIUrl":"https://doi.org/10.4314/jas.v34i2.13","url":null,"abstract":"The importance of fish as food and animal protein for man and livestock, source of income and employment was discussed. The trend in fisheries development is x-rayed, with general characteristics of rural fisheries explained. The problems, constraints and likely solutions were highlighted. Recommendations were made for sustainable fisheries activities in Nigeria. Fisheries business is capable of increasing Nigeria’s Gross Domestic Product (GDP) to solve substantially the country’s unemployment problems and support Federal Government’s agenda on food security for all Nigerians. \u0000Keywords: Nigeria fishing industry, artisanal fishery, industrial fishery, aquaculture.","PeriodicalId":32064,"journal":{"name":"Turkish Journal of Aquatic Sciences","volume":"45 1","pages":"107-116"},"PeriodicalIF":0.0,"publicationDate":"2020-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88294666","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 determine the Important Value Indices (IVI) of some plants in the University farm. Eighty plant stands belonging to three families (Musaceae, Caricaceae and Arecaceae) were identified. Their frequency and coverage percentage were measured within the sampling plot. Data obtained were subjected to Chi-square analysis to test for significance at 5% level of significance. The results indicated that the mean richness of Caricaceae, Arecaceae and Musaceae species in the study area were 3, 2 and 6, respectively. The highest (p<0.05) Floral Value Index of 90.52 was recorded in plantain group while the least value (22.40) was recoreded in coconut. The relative density ranged from 7.5 to 45 for the genus Cocos l. and Musa l. The highest Relative Frequency (46.03 %) was recorded for Musa l. and the least in Cocos l respectively. The Important Value Indices ranged between 20 and 152 which indicated that Igbariam had a very rich Agricultural soil for Economic plant development particularly for the families of Musaceae. The Musaceae showed the maximum IVI, hence the most important family among the studied plant species in the Agricultural farm plot. Thus, it is concluded that Musaceae, particularly plantain, should be given special consideration in prioritizing species for crop production in the study area. Keywords: importance value index, family importance value, plant, species, Musaceae
{"title":"Determination of importance value indices of some plant species using closest individual sampling techniques","authors":"F. O. Ezulike, C. Ukpaka, B. Chinyere","doi":"10.4314/jas.v34i1.10","DOIUrl":"https://doi.org/10.4314/jas.v34i1.10","url":null,"abstract":"This study was conducted to determine the Important Value Indices (IVI) of some plants in the University farm. Eighty plant stands belonging to three families (Musaceae, Caricaceae and Arecaceae) were identified. Their frequency and coverage percentage were measured within the sampling plot. Data obtained were subjected to Chi-square analysis to test for significance at 5% level of significance. The results indicated that the mean richness of Caricaceae, Arecaceae and Musaceae species in the study area were 3, 2 and 6, respectively. The highest (p<0.05) Floral Value Index of 90.52 was recorded in plantain group while the least value (22.40) was recoreded in coconut. The relative density ranged from 7.5 to 45 for the genus Cocos l. and Musa l. The highest Relative Frequency (46.03 %) was recorded for Musa l. and the least in Cocos l respectively. The Important Value Indices ranged between 20 and 152 which indicated that Igbariam had a very rich Agricultural soil for Economic plant development particularly for the families of Musaceae. The Musaceae showed the maximum IVI, hence the most important family among the studied plant species in the Agricultural farm plot. Thus, it is concluded that Musaceae, particularly plantain, should be given special consideration in prioritizing species for crop production in the study area. \u0000Keywords: importance value index, family importance value, plant, species, Musaceae","PeriodicalId":32064,"journal":{"name":"Turkish Journal of Aquatic Sciences","volume":"50 1","pages":"79-85"},"PeriodicalIF":0.0,"publicationDate":"2020-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83067557","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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