Pub Date : 2015-12-16DOI: 10.4172/2150-3508.1000152
Ahmed M. AL-Beak, Ghoneim, Si, El-Dakar Ay, M. Salem
In the present study fisheries, population dynamic and stock assessment of Diplodus sargus in the coast of North Siani (Eastern Mediterranean, Egypt) studied. Length weight relationship, catch length structure, length scale relationship, total length by the end of each year of life, growth in weight, Von Bertalanffy parameters, the values of (total, natural and fishing mortalities), survival rates, Approximate maximum length with the highest biomass of D. sargus and approximate maximum age tmax. Also Cohort analysis (VPA, age based) which represent the estimated values of the population numbers, survivors, natural and fishing mortalities for each year of life of D. sargus were studied.
{"title":"Population Dynamic and Stock Assesment of White Seabream Diplodus sargus (Linnaeus, 1758) in the Coast of North Siani","authors":"Ahmed M. AL-Beak, Ghoneim, Si, El-Dakar Ay, M. Salem","doi":"10.4172/2150-3508.1000152","DOIUrl":"https://doi.org/10.4172/2150-3508.1000152","url":null,"abstract":"In the present study fisheries, population dynamic and stock assessment of Diplodus sargus in the coast of North Siani (Eastern Mediterranean, Egypt) studied. Length weight relationship, catch length structure, length scale relationship, total length by the end of each year of life, growth in weight, Von Bertalanffy parameters, the values of (total, natural and fishing mortalities), survival rates, Approximate maximum length with the highest biomass of D. sargus and approximate maximum age tmax. Also Cohort analysis (VPA, age based) which represent the estimated values of the population numbers, survivors, natural and fishing mortalities for each year of life of D. sargus were studied.","PeriodicalId":166175,"journal":{"name":"Fisheries and Aquaculture Journal","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129563366","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}
Pub Date : 2015-12-10DOI: 10.4172/2150-3508.1000150
Marwa Mohammed Abou Hadied, A. Khidr, O. A. A. Samak, A. Said
Surface topography of anterior adhesive apparatus was studied of the gill monogenean parasite Diplectanum sp. Diesing, 1858 inhabiting the marine water fish Dicentrachus sp. using SEM. The study revealed that the parasite has three head lobes on each anterolateral region of the head; each lobe accommodates a single, ventrally located adhesive sac. These sacs receive secretion from glands openings that located on the lumen of these sacs. Rodshaped secretory bodies and granular irregularly shaped bodies which may be secretory bodies of the adhesive gland cells were seen open into the adhesive sacs. The tegument of the anterior adhesive area of Diplectanum sp. was characterized by many microvillous like structure. The possible functions of these distinctive features in the temporary attachment are discussed. Numerous adhesive papillae presumed sensory structures were found associated with the tegument of the anterior adhesive area and ventral surface of the body. A single ciliary structure supported by a collar of tegument occurs singly close to the mouth opening. It is suspected to be ciliated sensory ending serve to locate feeding sites. The possible functions of these presumed sensory structures were discussed. The parasite adaptation in its microhabitat in facing the strong water current inside the host fish gills was discussed
{"title":"Surface Topography of the Anterior Adhesive Apparatus of the Gill Monogenean Parasite Diplectanum sp. diesing, 1858, with some Surface Criteria","authors":"Marwa Mohammed Abou Hadied, A. Khidr, O. A. A. Samak, A. Said","doi":"10.4172/2150-3508.1000150","DOIUrl":"https://doi.org/10.4172/2150-3508.1000150","url":null,"abstract":"Surface topography of anterior adhesive apparatus was studied of the gill monogenean parasite Diplectanum sp. Diesing, 1858 inhabiting the marine water fish Dicentrachus sp. using SEM. The study revealed that the parasite has three head lobes on each anterolateral region of the head; each lobe accommodates a single, ventrally located adhesive sac. These sacs receive secretion from glands openings that located on the lumen of these sacs. Rodshaped secretory bodies and granular irregularly shaped bodies which may be secretory bodies of the adhesive gland cells were seen open into the adhesive sacs. The tegument of the anterior adhesive area of Diplectanum sp. was characterized by many microvillous like structure. The possible functions of these distinctive features in the temporary attachment are discussed. Numerous adhesive papillae presumed sensory structures were found associated with the tegument of the anterior adhesive area and ventral surface of the body. A single ciliary structure supported by a collar of tegument occurs singly close to the mouth opening. It is suspected to be ciliated sensory ending serve to locate feeding sites. The possible functions of these presumed sensory structures were discussed. The parasite adaptation in its microhabitat in facing the strong water current inside the host fish gills was discussed","PeriodicalId":166175,"journal":{"name":"Fisheries and Aquaculture Journal","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132752442","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}
Pub Date : 2015-12-10DOI: 10.4172/2150-3508.1000151
K. Raja, A. Gopalakrishnan, Rajkumar Singh, R. Vijayakumar
Loose shell syndrome is a chronic disease in shrimp industries, in the present study, two different L. vannamei grow-out ponds (normal and LSS infected ponds) were selected to study their water quality parameters. Average Body Weight (ABW) and Daily Growth Rate (DGR) in Prakasam district of Andhra Pradesh. The results of the present study showed, there was no much variation in water quality parameters between both the ponds except pH. The daily growth rate and average body weight was higher in the normal pond than LSS infected one. The maximum LSS prevalence was reached up to 20%. The infected shrimps became sluggish and negative allometric growth. The results of present study revealed that the LSS infected shrimps showed lower production in the grow-out pond.
{"title":"Loose Shell Syndrome (LSS) in Litopenaeus vannamei grow-out Ponds and its Effect on Growth and Production","authors":"K. Raja, A. Gopalakrishnan, Rajkumar Singh, R. Vijayakumar","doi":"10.4172/2150-3508.1000151","DOIUrl":"https://doi.org/10.4172/2150-3508.1000151","url":null,"abstract":"Loose shell syndrome is a chronic disease in shrimp industries, in the present study, two different L. vannamei grow-out ponds (normal and LSS infected ponds) were selected to study their water quality parameters. Average Body Weight (ABW) and Daily Growth Rate (DGR) in Prakasam district of Andhra Pradesh. The results of the present study showed, there was no much variation in water quality parameters between both the ponds except pH. The daily growth rate and average body weight was higher in the normal pond than LSS infected one. The maximum LSS prevalence was reached up to 20%. The infected shrimps became sluggish and negative allometric growth. The results of present study revealed that the LSS infected shrimps showed lower production in the grow-out pond.","PeriodicalId":166175,"journal":{"name":"Fisheries and Aquaculture Journal","volume":"110 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114993543","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}
Pub Date : 2015-11-27DOI: 10.4172/2150-3508.1000137
H. U. Riisgård, Josephine Goldstein, K. Lundgreen, F. Lüskow
Species composition, population densities and size of jellyfish and ctenophores were recorded during 5 cruises in the heavily eutrophicated Limfjorden in 2014. No or very few ctenophores (Pleurobrachia pileus) and jellyfish (Aurelia aurita, Cyanea lamarckii) were recorded in April and June 2014, whereas in August and September numerous small individuals of the invasive ctenophore Mnemiopsis leidyi were found on all 4 locations studied, which were strongly reduced in population density during November. M. leidyi exerted a notable predation impact, most pronounced in Logstor Bredning and Skive Fjord in August when the estimated half-lives of zooplankton were 4.8 and 7.3 d, respectively, and in late September, when the half-life in Skive Fjord was only 2.2 d. Severe oxygen depletion in Logstor Bredning and Skive Fjord between June and September resulted in a release of nutrients. This was followed by a bloom of the dinoflagellate Noctiluca scintillans and a subsequent peak in the abundance of copepods which decreased rapidly after the introduction of M. leidyi into Limfjorden from the North Sea (between early April and mid- July) to become virtually absent during the rest of the season. This subsequently resulted in starvation and decay of the M. leidyi population. The small predatory ctenophore Beroe gracilis was recorded on most locations during August and September 2014 but although B. gracilis eats small M. leidyi, their low number suggested a negligible predation impact on the M. leidyi population. Our present understanding of the many biological and environmental factors that control the species composition, abundance and predation impact of jellyfish and ctenophore populations in Limfjorden are discussed. It is concluded that there are many unsolved questions, e.g. how gelatinous predation of zooplankton may reinforce anoxia and further habitat degradation in eutrophicated waters.
{"title":"Jellyfish and Ctenophores in the Environmentally Degraded Limfjorden (Denmark) During 2014 - Species Composition, Population Densities and Predation Impact","authors":"H. U. Riisgård, Josephine Goldstein, K. Lundgreen, F. Lüskow","doi":"10.4172/2150-3508.1000137","DOIUrl":"https://doi.org/10.4172/2150-3508.1000137","url":null,"abstract":"Species composition, population densities and size of jellyfish and ctenophores were recorded during 5 cruises in the heavily eutrophicated Limfjorden in 2014. No or very few ctenophores (Pleurobrachia pileus) and jellyfish (Aurelia aurita, Cyanea lamarckii) were recorded in April and June 2014, whereas in August and September numerous small individuals of the invasive ctenophore Mnemiopsis leidyi were found on all 4 locations studied, which were strongly reduced in population density during November. M. leidyi exerted a notable predation impact, most pronounced in Logstor Bredning and Skive Fjord in August when the estimated half-lives of zooplankton were 4.8 and 7.3 d, respectively, and in late September, when the half-life in Skive Fjord was only 2.2 d. Severe oxygen depletion in Logstor Bredning and Skive Fjord between June and September resulted in a release of nutrients. This was followed by a bloom of the dinoflagellate Noctiluca scintillans and a subsequent peak in the abundance of copepods which decreased rapidly after the introduction of M. leidyi into Limfjorden from the North Sea (between early April and mid- July) to become virtually absent during the rest of the season. This subsequently resulted in starvation and decay of the M. leidyi population. The small predatory ctenophore Beroe gracilis was recorded on most locations during August and September 2014 but although B. gracilis eats small M. leidyi, their low number suggested a negligible predation impact on the M. leidyi population. Our present understanding of the many biological and environmental factors that control the species composition, abundance and predation impact of jellyfish and ctenophore populations in Limfjorden are discussed. It is concluded that there are many unsolved questions, e.g. how gelatinous predation of zooplankton may reinforce anoxia and further habitat degradation in eutrophicated waters.","PeriodicalId":166175,"journal":{"name":"Fisheries and Aquaculture Journal","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131655860","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}
Pub Date : 2015-11-24DOI: 10.4172/2150-3508.1000148
G. Naik, M. Rashid, Balkhi Mh
In an aquatic ecosystem, the density and diversity of organisms depend on availability and quality of water. During the present study an attempt was made to analyse some of the important physico-chemical parameters of the water samples at three different sites of the Manasbal Lake to check the pollution load. Various parameters were analysed for a period of six months from July 2010 to December 2010 on monthly intervals by following standard methods. Among the various parameters recorded the overall Air temperature ranged from 7.2°C to 30.2°C; surface water temperature ranged from 6.1°C to 26.5°C; Secchi-disc transparency from 1.5 m to 4.5 m; Conductivity varied from 149 to 292 μS cm-1; Dissolved oxygen from 2.5 to 8.8 mg L-1; Free Co2 from 0.2 to 13.4 mg L-1; pH from 8.1 to 9.2; Total Alkalinity varied from 126 to 243 mg L-1; Chloride values ranged from 5.9 to 33.5 mg L-1; Total Hardness ranged from 119 to 218 mg L-1; Ammonical Nitrogen varied from 27 to 193 μg L-1; Nitrate Nitrogen varied from 31 to 286 μg L-1; Ortho-Phosphate Phosphorous varied from 4.3 to 33.0 μg L-1 and Phosphate Phosphorous ranged from 83.0 to 261 μg L-1. Almost all the above parameters showed that the pollution load is increasing especially at littoral sites due to agricultural run-off and human settlements disposing sewage, besides anthropogenic stresses in the catchment area. The pH of water of this lake was higher due to calcium intrusion from Kondabal area. Hence, the present study urges the need for immediate remedial measures for protection and conservation of this lake in order to save it from further deterioration.
{"title":"Changes in Physico-chemical Parameters at different Sites of Manasbal Lake of Kashmir, India","authors":"G. Naik, M. Rashid, Balkhi Mh","doi":"10.4172/2150-3508.1000148","DOIUrl":"https://doi.org/10.4172/2150-3508.1000148","url":null,"abstract":"In an aquatic ecosystem, the density and diversity of organisms depend on availability and quality of water. During the present study an attempt was made to analyse some of the important physico-chemical parameters of the water samples at three different sites of the Manasbal Lake to check the pollution load. Various parameters were analysed for a period of six months from July 2010 to December 2010 on monthly intervals by following standard methods. Among the various parameters recorded the overall Air temperature ranged from 7.2°C to 30.2°C; surface water temperature ranged from 6.1°C to 26.5°C; Secchi-disc transparency from 1.5 m to 4.5 m; Conductivity varied from 149 to 292 μS cm-1; Dissolved oxygen from 2.5 to 8.8 mg L-1; Free Co2 from 0.2 to 13.4 mg L-1; pH from 8.1 to 9.2; Total Alkalinity varied from 126 to 243 mg L-1; Chloride values ranged from 5.9 to 33.5 mg L-1; Total Hardness ranged from 119 to 218 mg L-1; Ammonical Nitrogen varied from 27 to 193 μg L-1; Nitrate Nitrogen varied from 31 to 286 μg L-1; Ortho-Phosphate Phosphorous varied from 4.3 to 33.0 μg L-1 and Phosphate Phosphorous ranged from 83.0 to 261 μg L-1. Almost all the above parameters showed that the pollution load is increasing especially at littoral sites due to agricultural run-off and human settlements disposing sewage, besides anthropogenic stresses in the catchment area. The pH of water of this lake was higher due to calcium intrusion from Kondabal area. Hence, the present study urges the need for immediate remedial measures for protection and conservation of this lake in order to save it from further deterioration.","PeriodicalId":166175,"journal":{"name":"Fisheries and Aquaculture Journal","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124950921","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}
Pub Date : 2015-11-15DOI: 10.4172/2150-3508.1000E124
R. Wakchaure, S. Ganguly, Kausar Qadri, P. Praveen, T. Mahajan
Many faster growing transgenic fish including both cold water (salmon, trout) and warm water (tilapia, carp) species have been produced. The development of transgenic fish can serve as excellent experimental models for basic scientific investigations, environmental toxicology and in biotechnological applications. The fast growth characteristic of GH gene transgenic fish will be of great importance to support aquaculture production and economic efficiency. The transgenic fish are efficient feed converter, thus more economical for the fish farmer as the feed accounts for 60-70% of total cost in aquaculture.
{"title":"Importance of Transgenic Fish to Global Aquaculture: A Review","authors":"R. Wakchaure, S. Ganguly, Kausar Qadri, P. Praveen, T. Mahajan","doi":"10.4172/2150-3508.1000E124","DOIUrl":"https://doi.org/10.4172/2150-3508.1000E124","url":null,"abstract":"Many faster growing transgenic fish including both cold water (salmon, trout) and warm water (tilapia, carp) species have been produced. The development of transgenic fish can serve as excellent experimental models for basic scientific investigations, environmental toxicology and in biotechnological applications. The fast growth characteristic of GH gene transgenic fish will be of great importance to support aquaculture production and economic efficiency. The transgenic fish are efficient feed converter, thus more economical for the fish farmer as the feed accounts for 60-70% of total cost in aquaculture.","PeriodicalId":166175,"journal":{"name":"Fisheries and Aquaculture Journal","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116577764","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}
Pub Date : 2015-10-27DOI: 10.4172/2150-3508.1000147
F. Ahmad, K. Fazili, T. A. Sofi, Bashir A. Sheikh, A. Waza, Rabiya Rashid, Tantry Tariq Gani
The study reports the results of molecular characterization of the Internal Transcribed Spacer (ITS) of ribosomal DNA of 3 Monogenean species using polymerase chain reaction (PCR), nucleotide sequencing and construction of phylogenetic trees from different fish hosts of Kashmir. The present study shows that the size of the amplified product is 873bp long for D. kashmirensis, 1120bp long in D. aegyptensis and 687bp long in D. guptai revealing that there are intraspecific differences in their base pair lengths. Guanine and Cytocine (G+C) content of three Diplozoon species was found nearly constant for three species i.e., 47% (D. kashmirensis); 47% (D. aegyptensis) and 48% (D. guptai), this GC richness contributes to physical attributes of RNA structures, as there is correlation between GC content and optimal growth temperature. An important observation during the present study has been noticed that Schizothorax niger is infected by all the three species of Diplozoidae; D. kashmirensis; D. aegyptensis and D. guptai, but when all six fishes were collected simultaneously, parasitism by all the parasite species was never observed. Phylogenetic trees Maximum Parsimony (MP), Maximum Likelihood (ML) and Neighbor Joining (NJ) showed that D. kashmirensis and D. aegyptensis share a common host Carassius carassius and S. niger.
采用聚合酶链式反应(PCR)技术对克什米尔地区3种单基因鱼类核糖体DNA的内部转录间隔区(ITS)进行了分子鉴定、核苷酸测序和系统发育树构建。本研究结果表明，扩增产物长度分别为873bp、1120bp和687bp，表明它们的碱基对长度存在种内差异。三种双plozoon的鸟嘌呤和胞嘧啶(G+C)含量基本不变，分别为47% (D. kashmirensis);47%(埃及伊蚊)和48%(古泰伊蚊)，这种GC丰富度有助于RNA结构的物理属性，因为GC含量与最佳生长温度之间存在相关性。本研究的一个重要发现是，黑裂胸虫可被所有三种梁虫科昆虫感染;d . kashmirensis;埃及伊蚊和古泰伊蚊均有寄生，但同时采集6种鱼时，未观察到所有寄生虫的寄生情况。最大简约性(MP)、最大似然性(ML)和邻居联结(NJ)的系统进化树分析表明，喀什米尔伊蚊和埃及伊蚊有共同的寄主卡拉西斯(Carassius)和尼日尔伊蚊。
{"title":"Morphological and Molecular Characterization of Diplozoon kashmirensis;D. aegyptensis and D. guptai Collected from Fishes of Kashmir Valley-India","authors":"F. Ahmad, K. Fazili, T. A. Sofi, Bashir A. Sheikh, A. Waza, Rabiya Rashid, Tantry Tariq Gani","doi":"10.4172/2150-3508.1000147","DOIUrl":"https://doi.org/10.4172/2150-3508.1000147","url":null,"abstract":"The study reports the results of molecular characterization of the Internal Transcribed Spacer (ITS) of ribosomal DNA of 3 Monogenean species using polymerase chain reaction (PCR), nucleotide sequencing and construction of phylogenetic trees from different fish hosts of Kashmir. The present study shows that the size of the amplified product is 873bp long for D. kashmirensis, 1120bp long in D. aegyptensis and 687bp long in D. guptai revealing that there are intraspecific differences in their base pair lengths. Guanine and Cytocine (G+C) content of three Diplozoon species was found nearly constant for three species i.e., 47% (D. kashmirensis); 47% (D. aegyptensis) and 48% (D. guptai), this GC richness contributes to physical attributes of RNA structures, as there is correlation between GC content and optimal growth temperature. An important observation during the present study has been noticed that Schizothorax niger is infected by all the three species of Diplozoidae; D. kashmirensis; D. aegyptensis and D. guptai, but when all six fishes were collected simultaneously, parasitism by all the parasite species was never observed. Phylogenetic trees Maximum Parsimony (MP), Maximum Likelihood (ML) and Neighbor Joining (NJ) showed that D. kashmirensis and D. aegyptensis share a common host Carassius carassius and S. niger.","PeriodicalId":166175,"journal":{"name":"Fisheries and Aquaculture Journal","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127001538","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}
Pub Date : 2015-10-24DOI: 10.4172/2150-3508.1000146
D. Kannan, P. Thirunavukkarasu, K. Jagadeesan, N. Shettu, Aswini Kumar
The reproductive performance of the broodstock was assessed at each stage of the maturation and spawning process. Measures of maturation rate, spawning rate, fecundity, hatch rate and nauplii production rate were obtained. The reproductive performance was found for the imported Specific Pathogen Free (SPF) broodstock from Shrimp Improvement system (SIS), Florida, USA. The no.of spawning, eggs quantity, fertility, hatching rate and nauplii production were lowest in 1st to 3rd spawning when females were 7 months old and increased from 4th spawning rate onwards. As the size of females increased from 30 g to 52 g the mean number of eggs per spawning increased from 150,000 to 442,000. Although female body weight was increasingly larger through the study period and the larger females would be expected to produce more eggs per spawning and hatching. The hatching rate was increased from 3rd spawning onwards. The nauplii production rate (NPR), which is a function of egg production and hatching rate, showed a significant increasing from 48% to 96%. In 10th spawning all the activities were increased. This information can be used to select broodstock for hatchery production.
{"title":"Procedure for Maturation and Spawning of Imported shrimp Litopenaeus vannamei in Commercial Hatchery, South East Coast of India","authors":"D. Kannan, P. Thirunavukkarasu, K. Jagadeesan, N. Shettu, Aswini Kumar","doi":"10.4172/2150-3508.1000146","DOIUrl":"https://doi.org/10.4172/2150-3508.1000146","url":null,"abstract":"The reproductive performance of the broodstock was assessed at each stage of the maturation and spawning process. Measures of maturation rate, spawning rate, fecundity, hatch rate and nauplii production rate were obtained. The reproductive performance was found for the imported Specific Pathogen Free (SPF) broodstock from Shrimp Improvement system (SIS), Florida, USA. The no.of spawning, eggs quantity, fertility, hatching rate and nauplii production were lowest in 1st to 3rd spawning when females were 7 months old and increased from 4th spawning rate onwards. As the size of females increased from 30 g to 52 g the mean number of eggs per spawning increased from 150,000 to 442,000. Although female body weight was increasingly larger through the study period and the larger females would be expected to produce more eggs per spawning and hatching. The hatching rate was increased from 3rd spawning onwards. The nauplii production rate (NPR), which is a function of egg production and hatching rate, showed a significant increasing from 48% to 96%. In 10th spawning all the activities were increased. This information can be used to select broodstock for hatchery production.","PeriodicalId":166175,"journal":{"name":"Fisheries and Aquaculture Journal","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127094816","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}
Pub Date : 2015-10-24DOI: 10.4172/2150-3508.1000145
Oketoki To
Penaeus monodon is an invasive species found in the coastal waters of Nigeria. Although widely exploited with significant economic importance, investigation into its adaptation and potential ecological impact in the newly found environment is poorly known. This survey provides baseline information on the phytoplankton community and physico-chemical parameters in ten selected stations from five states where they are exploited in Nigeria. These include: Ibeno (Akwa Ibom State), Bonny (Rivers State), Kaa (Rivers State), Brass (Bayelsa State), Aiyetoro (Ondo State), Makoko (Lagos state), Folu (Lagos state), Apapa (Lagos state), Tin Can Island (Lagos state) and Tarkwa Bay (Lagos state). Total of 147 species of phytoplankton from six classes were recorded during the survey with diatoms being the most prevalent (70.4%), green algae (20.4%), Blue-green algae (5.6%), Chrysophyceae (1.9%). Water parameters recorded temperature (range: 27.33 ± 1.53°C-29.00 ± 1.00°C), pH (7.39 ± 0.08-8.13 ± 0.14), dissolved oxygen (5.40 ± 3.22 mgL-1-8.00 ± 1.44 mgL-1), Conductivity (11.22 ± 10.03 μS/cm-39.33 ± 5.87 μS/cm) and salinity (11.02 ± 15.56% -25.98 ± 2.02%). Lowest values for phosphate, nitrate-nitrogen and sulphate were 0.11 ± 0.07mgL- 1, 0.10 ± 0.07 mgL-1 and 523.67 ± 880.21 mgL-1 respectively. Generally, ecological factors in their newly found environment are similar to their native range. However, negative impact as an invasive species most be checked.
单节对虾是在尼日利亚沿海水域发现的一种入侵物种。尽管其被广泛开发并具有重要的经济意义，但对其在新发现环境中的适应性和潜在生态影响的调查却知之甚少。这项调查提供了尼日利亚五个州十个选定监测站浮游植物群落和物理化学参数的基线信息。其中包括:Ibeno(阿夸伊博姆州)、Bonny(河流州)、Kaa(河流州)、Brass(巴耶尔萨州)、Aiyetoro(翁多州)、Makoko(拉各斯州)、Folu(拉各斯州)、Apapa(拉各斯州)、Tin Can Island(拉各斯州)和Tarkwa Bay(拉各斯州)。调查共记录浮游植物6纲147种，以硅藻(70.4%)、绿藻(20.4%)、蓝绿藻(5.6%)、金藻(1.9%)最多。水参数记录温度(范围:27.33±1.53°C-29.00±1.00°C)、pH(7.39±0.08-8.13±0.14)、溶解氧(5.40±3.22 μ l -1-8.00±1.44 μ l -1)、电导率(11.22±10.03 μS/cm-39.33±5.87 μS/cm)和盐度(11.02±15.56% -25.98±2.02%)。磷酸盐、硝酸盐氮和硫酸盐的最低值分别为0.11±0.07mg -1、0.10±0.07mg -1和523.67±880.21 mg -1。一般来说，它们新发现的环境中的生态因素与它们的原生地相似。然而，作为入侵物种的负面影响仍有待检查。
{"title":"Survey on Phytoplankton Biomass and Water Parameters in the Habitats of Invasive Tigers Shrimps (Penaeus Monodon) in Nigeria","authors":"Oketoki To","doi":"10.4172/2150-3508.1000145","DOIUrl":"https://doi.org/10.4172/2150-3508.1000145","url":null,"abstract":"Penaeus monodon is an invasive species found in the coastal waters of Nigeria. Although widely exploited with significant economic importance, investigation into its adaptation and potential ecological impact in the newly found environment is poorly known. This survey provides baseline information on the phytoplankton community and physico-chemical parameters in ten selected stations from five states where they are exploited in Nigeria. These include: Ibeno (Akwa Ibom State), Bonny (Rivers State), Kaa (Rivers State), Brass (Bayelsa State), Aiyetoro (Ondo State), Makoko (Lagos state), Folu (Lagos state), Apapa (Lagos state), Tin Can Island (Lagos state) and Tarkwa Bay (Lagos state). Total of 147 species of phytoplankton from six classes were recorded during the survey with diatoms being the most prevalent (70.4%), green algae (20.4%), Blue-green algae (5.6%), Chrysophyceae (1.9%). Water parameters recorded temperature (range: 27.33 ± 1.53°C-29.00 ± 1.00°C), pH (7.39 ± 0.08-8.13 ± 0.14), dissolved oxygen (5.40 ± 3.22 mgL-1-8.00 ± 1.44 mgL-1), Conductivity (11.22 ± 10.03 μS/cm-39.33 ± 5.87 μS/cm) and salinity (11.02 ± 15.56% -25.98 ± 2.02%). Lowest values for phosphate, nitrate-nitrogen and sulphate were 0.11 ± 0.07mgL- 1, 0.10 ± 0.07 mgL-1 and 523.67 ± 880.21 mgL-1 respectively. Generally, ecological factors in their newly found environment are similar to their native range. However, negative impact as an invasive species most be checked.","PeriodicalId":166175,"journal":{"name":"Fisheries and Aquaculture Journal","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129163869","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}
Pub Date : 2015-08-26DOI: 10.4172/2150-3508.1000142
Mohammad Ali Khan, Joydev Ghosh, Banshidhar Sahoo
In this paper, we propose a new harvesting strategy namely the harvesting for controlling chaotic population in a food chain model. In particular, we have taken the three species Hastings and Powell food chain model for demonstration. We have shown threshold harvesting strategy can be effectively employed to obtain a steady or cyclic behaviour from chaotic fish population by varying either the frequency of harvesting or the amount of harvesting of fish population. Numerical simulation results are presented to show the effectiveness of the scheme. We obtain steady state; limit cycle, period-2 and period-4 behaviour from chaotic Hastings and Powell model. This threshold harvesting strategy will be very useful for species conservation and fishery management
{"title":"Controlling Chaos in a Food Chain Model through Threshold Harvesting","authors":"Mohammad Ali Khan, Joydev Ghosh, Banshidhar Sahoo","doi":"10.4172/2150-3508.1000142","DOIUrl":"https://doi.org/10.4172/2150-3508.1000142","url":null,"abstract":"In this paper, we propose a new harvesting strategy namely the harvesting for controlling chaotic population in a food chain model. In particular, we have taken the three species Hastings and Powell food chain model for demonstration. We have shown threshold harvesting strategy can be effectively employed to obtain a steady or cyclic behaviour from chaotic fish population by varying either the frequency of harvesting or the amount of harvesting of fish population. Numerical simulation results are presented to show the effectiveness of the scheme. We obtain steady state; limit cycle, period-2 and period-4 behaviour from chaotic Hastings and Powell model. This threshold harvesting strategy will be very useful for species conservation and fishery management","PeriodicalId":166175,"journal":{"name":"Fisheries and Aquaculture Journal","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130365122","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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