Pub Date : 2021-01-01DOI: 10.35248/2155-9546.21.12.636
Kiweewa Bernard
Overfishing is a challenge that has caused the extinction of endemic fish species and decreasing fish stocks in Lake Albert. This study focuses on the performance of aquaponics technology as a farming alternative in Hoima region to address the challenges faced by aquaponics farmers. This technology is known to provide fish resources and agricultural products for both commercial and domestic consumption. The objectives of this study included; comparing the performance of fish, small and large leaf plants in an aquaponics system, determining the efficiency of plant beds in filtering water, and identifying the challenges faced by aquaponics farmers in Hoima district. The KYUBDAS investigation helped this study identify the performance of fish and plants in a Recirculating fish Aquaculture System (RAS). The fish species were, (1) Nile tilapia (Oreochromis niloticus) (2) African catfish (Clarius gariepinus) and vegetable plants included: (1) Coriander (Coriandrum sativa) (2) Sukuma wiki (Brassica oleracea), (3) Spinach (Spinacia oleracea), and (4) Lettuce (Lectuca sativa).
{"title":"Performance of Aquaponics Technologies in the Albertine Region, Western Uganda","authors":"Kiweewa Bernard","doi":"10.35248/2155-9546.21.12.636","DOIUrl":"https://doi.org/10.35248/2155-9546.21.12.636","url":null,"abstract":"Overfishing is a challenge that has caused the extinction of endemic fish species and decreasing fish stocks in Lake Albert. This study focuses on the performance of aquaponics technology as a farming alternative in Hoima region to address the challenges faced by aquaponics farmers. This technology is known to provide fish resources and agricultural products for both commercial and domestic consumption. The objectives of this study included; comparing the performance of fish, small and large leaf plants in an aquaponics system, determining the efficiency of plant beds in filtering water, and identifying the challenges faced by aquaponics farmers in Hoima district. The KYUBDAS investigation helped this study identify the performance of fish and plants in a Recirculating fish Aquaculture System (RAS). The fish species were, (1) Nile tilapia (Oreochromis niloticus) (2) African catfish (Clarius gariepinus) and vegetable plants included: (1) Coriander (Coriandrum sativa) (2) Sukuma wiki (Brassica oleracea), (3) Spinach (Spinacia oleracea), and (4) Lettuce (Lectuca sativa).","PeriodicalId":15243,"journal":{"name":"Journal of Aquaculture Research and Development","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82685497","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}
Fish provides nutrients that are essential to cognitive and physical development, and an important part of healthy diet. However, resource tragedy, overfishing, employing unrecommended mesh size and low management practices are discouraging fish marketed supply. This study was sought to identify the determinants of fish market supply at Lake Hawassa. The study used cross-sectional data from representative fishers of 166 and key informants. Both descriptive and Multiple Linear Regression (MLR) model were employed to analyze the data. The model indicated that market information, household education, fishing experience, owning of cold storage, credit access, fishing site and post-harvest loss affected the fish supply statistically and significantly. Accessing market information, household education, credit facility, cold storage, and experience sharing are indispensable for better fish supply.
{"title":"Determinants of Fish Market Supply in the Case of Lake Hawassa, Sidama National Regional State, Ethiopia","authors":"Tekalign Tuluka, Ketema Bekele, Kumilachew Alamerie","doi":"10.35248/2155-9546.21.12.650","DOIUrl":"https://doi.org/10.35248/2155-9546.21.12.650","url":null,"abstract":"Fish provides nutrients that are essential to cognitive and physical development, and an important part of healthy diet. However, resource tragedy, overfishing, employing unrecommended mesh size and low management practices are discouraging fish marketed supply. This study was sought to identify the determinants of fish market supply at Lake Hawassa. The study used cross-sectional data from representative fishers of 166 and key informants. Both descriptive and Multiple Linear Regression (MLR) model were employed to analyze the data. The model indicated that market information, household education, fishing experience, owning of cold storage, credit access, fishing site and post-harvest loss affected the fish supply statistically and significantly. Accessing market information, household education, credit facility, cold storage, and experience sharing are indispensable for better fish supply.","PeriodicalId":15243,"journal":{"name":"Journal of Aquaculture Research and Development","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82956899","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 : 2021-01-01DOI: 10.35248/2155-9546.21.12.654
Rakshitha Kotha
{"title":"Editorial Note on Photosynthetic Organisms in the Ocean","authors":"Rakshitha Kotha","doi":"10.35248/2155-9546.21.12.654","DOIUrl":"https://doi.org/10.35248/2155-9546.21.12.654","url":null,"abstract":"","PeriodicalId":15243,"journal":{"name":"Journal of Aquaculture Research and Development","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75372476","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 : 2021-01-01DOI: 10.35248/2155-9546.21.12.644
Teshome Belay Eshete, K. B. Workagegn, Natarajan Pavanasam
The present study was aimed at evaluating the effects of partial replacement of fishmeal with locally available feed ingredients on growth performance, feed utilization efficiency body composition and apparent digestibility coefficient of protein (ADCp) of Nile tilapia. For this purpose, seven experimental diets were prepared using 0%, 10% and 20% Jatropha, Alfalfa and Brewery waste as partial replacement of fishmeal. Healthy mixed-sex Nile tilapia with an average body weight of 6.5 ± 0.56 g were collected from Ziway Fish and Other Aquatic Life Research Center and stocked in fiberglass plastic tanks in triplicates at a stocking density of 20 fish per tank. The fish were fed three times a day with a control diet for one week and then with experimental diets for a period of four months at a rate of 3-6% body weight of fish. For ADCp studies, fish were reared for 20 days and were fed with control and test diets having an internal marker. Data were collected twice a month. The result showed that the fish fed with control diet,10%Jatropha, 10% Alfalfa and 10% and 20% Brewery waste based diets showed significantly better final body weight (28.7-30.0 g) specific growth rates (1.39-1.47%/day),feed conversion ratio (1.44-1.56) and protein utilization efficiency (0.60-0.66) than the fish fed with 20% Jatropha and Alfalfa based diets (23.8-26.0 g for final body weight, 1.25-1.33%/day for specific growth rate, 1.95-1.97 for food conversion ratio and 0.49-0.54 for protein utilization efficiency). The final survival rates of the experimental fish (73.3-86.6%) did not differ significantly (P>0.05) among feeding treatments. In conclusion, the fish meal can be replaced using the three ingredients up to 10% without negative effects on the growth and feed utilization of Nile tilapia.
{"title":"Effects of Partial Replacement of Fishmeal by Locally Available Ingredients on Growth Performance and Feed Utilization Efficiency of Nile Tilapia, Oreochromis niloticus","authors":"Teshome Belay Eshete, K. B. Workagegn, Natarajan Pavanasam","doi":"10.35248/2155-9546.21.12.644","DOIUrl":"https://doi.org/10.35248/2155-9546.21.12.644","url":null,"abstract":"The present study was aimed at evaluating the effects of partial replacement of fishmeal with locally available feed ingredients on growth performance, feed utilization efficiency body composition and apparent digestibility coefficient of protein (ADCp) of Nile tilapia. For this purpose, seven experimental diets were prepared using 0%, 10% and 20% Jatropha, Alfalfa and Brewery waste as partial replacement of fishmeal. Healthy mixed-sex Nile tilapia with an average body weight of 6.5 ± 0.56 g were collected from Ziway Fish and Other Aquatic Life Research Center and stocked in fiberglass plastic tanks in triplicates at a stocking density of 20 fish per tank. The fish were fed three times a day with a control diet for one week and then with experimental diets for a period of four months at a rate of 3-6% body weight of fish. For ADCp studies, fish were reared for 20 days and were fed with control and test diets having an internal marker. Data were collected twice a month. The result showed that the fish fed with control diet,10%Jatropha, 10% Alfalfa and 10% and 20% Brewery waste based diets showed significantly better final body weight (28.7-30.0 g) specific growth rates (1.39-1.47%/day),feed conversion ratio (1.44-1.56) and protein utilization efficiency (0.60-0.66) than the fish fed with 20% Jatropha and Alfalfa based diets (23.8-26.0 g for final body weight, 1.25-1.33%/day for specific growth rate, 1.95-1.97 for food conversion ratio and 0.49-0.54 for protein utilization efficiency). The final survival rates of the experimental fish (73.3-86.6%) did not differ significantly (P>0.05) among feeding treatments. In conclusion, the fish meal can be replaced using the three ingredients up to 10% without negative effects on the growth and feed utilization of Nile tilapia.","PeriodicalId":15243,"journal":{"name":"Journal of Aquaculture Research and Development","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87780576","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 : 2021-01-01DOI: 10.35248/2155-9546.21.12.649
Ajay Vs, R. AmruthaKrishnan
Gill net (Locally called odakku vala) design variation, operational techniques, catch composition and selectivity analysis in Vembanad wetland, Kerala was examined between January 2020 to June 2021. Netting materials used for gill net construction in Vembanad Lake were monofilament, multifilament Nylon (polyamide). The Gill net length was 25-55 m with a hung depth of 2-3 m. Gill net was highly species specific and showed selectivity for shallow water species. Its durability ranged from 3.5 months to 2 years depending on the netting material and the environmental conditions where it is being operated. Gill net fishery is one of the main types of artisanal fishery practiced occupationally by the fishermen community of Kerala. The region so far is untouched with the introduction of mechanized fishing apart from small traditionalized improvements. The Gill net was used to catch the fishes of marketable size, small fingerlings which were either used as bait or dried. Instead of using lead or aluminium needles as sinkers many of them were used to carry normal electric wire without copper string inside which reduce their cost of purchase.
{"title":"Design Characteristics and Specifications of Gill Net Operated Along the Lower Stretches of Vembanad Wetlands, Kerala, India","authors":"Ajay Vs, R. AmruthaKrishnan","doi":"10.35248/2155-9546.21.12.649","DOIUrl":"https://doi.org/10.35248/2155-9546.21.12.649","url":null,"abstract":"Gill net (Locally called odakku vala) design variation, operational techniques, catch composition and selectivity analysis in Vembanad wetland, Kerala was examined between January 2020 to June 2021. Netting materials used for gill net construction in Vembanad Lake were monofilament, multifilament Nylon (polyamide). The Gill net length was 25-55 m with a hung depth of 2-3 m. Gill net was highly species specific and showed selectivity for shallow water species. Its durability ranged from 3.5 months to 2 years depending on the netting material and the environmental conditions where it is being operated. Gill net fishery is one of the main types of artisanal fishery practiced occupationally by the fishermen community of Kerala. The region so far is untouched with the introduction of mechanized fishing apart from small traditionalized improvements. The Gill net was used to catch the fishes of marketable size, small fingerlings which were either used as bait or dried. Instead of using lead or aluminium needles as sinkers many of them were used to carry normal electric wire without copper string inside which reduce their cost of purchase.","PeriodicalId":15243,"journal":{"name":"Journal of Aquaculture Research and Development","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80633796","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 : 2020-01-01DOI: 10.35248/2155-9546.19.10.583
A. G. Tantu, Suryawati Salam, Muhammad Ishak
Efforts to increase the productivity of ponds can be done by increasing stocking densities accompanied by providing excellent input and adequate technological support. Three stocking densities are 750; 1,000; and 1,250 individu/ m2, applied to ponds with an area of 1,600 m2 with water depth of 2.0 m, equipped with aeration systems in the form of windmills and root blowers, submersible pumps, automatic feeders, central drain and collector drain as well as wastewater treatment plants. The capacity of the aeration system is 500 kg of shrimp/HP biomass. Shrimp kept for 110 days. The results showed that the stocking density applied resulted in a final shrimp weight which was relatively the same range 15.50-16.45 (15.60 ± 0.40) g/individual with a daily growth value of 0.165-0.185 (0.17 ± 0.01) g/day. The production obtained is 13,714 kg; 18,285 kg; and 21,942 kg. Value of feed conversion ratio 1.42, 1.39, 1.54 and electricity needs 3.21, 2.53, 2.42 kw/kg of shrimp and 2.25 water requirements, 1.65, 1.63 m3/kg shrimp. The lowest shrimp production cost is IDR. 30,526/kg of shrimp on a stocking density of 1,000 individu/ m2 with an operating profit of IDR 585,142,857.14/year. The stocking density of 1,000 individu/m2 produces better performance, so it is recommended to be a reference for high stocking densities for vaname shrimp farming.
{"title":"Vaname Shrimp Cultivation (Litopenaeus vannamei) on High Stocking Densities in Controlled Ponds","authors":"A. G. Tantu, Suryawati Salam, Muhammad Ishak","doi":"10.35248/2155-9546.19.10.583","DOIUrl":"https://doi.org/10.35248/2155-9546.19.10.583","url":null,"abstract":"Efforts to increase the productivity of ponds can be done by increasing stocking densities accompanied by providing excellent input and adequate technological support. Three stocking densities are 750; 1,000; and 1,250 individu/ m2, applied to ponds with an area of 1,600 m2 with water depth of 2.0 m, equipped with aeration systems in the form of windmills and root blowers, submersible pumps, automatic feeders, central drain and collector drain as well as wastewater treatment plants. The capacity of the aeration system is 500 kg of shrimp/HP biomass. Shrimp kept for 110 days. The results showed that the stocking density applied resulted in a final shrimp weight which was relatively the same range 15.50-16.45 (15.60 ± 0.40) g/individual with a daily growth value of 0.165-0.185 (0.17 ± 0.01) g/day. The production obtained is 13,714 kg; 18,285 kg; and 21,942 kg. Value of feed conversion ratio 1.42, 1.39, 1.54 and electricity needs 3.21, 2.53, 2.42 kw/kg of shrimp and 2.25 water requirements, 1.65, 1.63 m3/kg shrimp. The lowest shrimp production cost is IDR. 30,526/kg of shrimp on a stocking density of 1,000 individu/ m2 with an operating profit of IDR 585,142,857.14/year. The stocking density of 1,000 individu/m2 produces better performance, so it is recommended to be a reference for high stocking densities for vaname shrimp farming.","PeriodicalId":15243,"journal":{"name":"Journal of Aquaculture Research and Development","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89600045","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 : 2020-01-01DOI: 10.35248/2155-9546.19.10.581
C. Paruntu, S. Darwisito, A. Rumengan, D. Wewengkang, H. Rotinsulu
The objective of this research is to investigate the effects of rabbitfish (Siganus canaliculatus) existence in polyculture system and feed type against the growth performance of bigeye trevally (Caranx sexfasciatus) in floating net cage. Study on polyculture of bigeye trevally and rabbitfish and monoculture of bigeye trevally in the cage were conducted at the coastal of South Bolaang Mongondow, North Sulawesi, Indonesia in 2018. The experiment was designed with three treatments for bigeye trevally, namely: monoculture of bigeye trevally fed with fresh trash fish + corn oil 4% (Treatment A), polyculture of bigeye trevally and rabbitfish fed with fresh trash fish + corn oil 4% (Treatment B), polyculture of bigeye trevally and rabbitfish fed only fresh trash fish (Treatment C); On the other hand, 2 treatments for rabbitfish, namely: polyculture of rabbitfish and bigeye trevally which are fed with only carp pellets + fresh trash fish (1:1) (Treatment D) and polyculture of rabbitfish and bigeye trevally which are fed with carp pellets + fresh trash fish (1:1) + corn oil 4% (Treatment E). Each treatment consisted of 3 replications. The results show that the daily growth rates of bigeye trevally from treatment A, B, and C are 0.67%, 1% and 0.68% of body weight per day, while the daily growth rates of rabbitfish from treatment D and E are 0.56% and 0.81% of body weight per day, respectively. Feed conversion ratios of bigeye trevally from treatment A, B and C are 6.69, 4.86 and 6, while feed conversion ratios of rabbitfish from treatment D and E are 4.57 and 4.16, respectively. Rabbitfish existence in polyculture system and feed type gave a faster growth of bigeye trevally in the cage compared to the absence of both.
{"title":"The Effects of Rabbitfish Existence in Polyculture System and Feed Type against the Growth Performance of Bigeye Trevally in Floating Net Cage","authors":"C. Paruntu, S. Darwisito, A. Rumengan, D. Wewengkang, H. Rotinsulu","doi":"10.35248/2155-9546.19.10.581","DOIUrl":"https://doi.org/10.35248/2155-9546.19.10.581","url":null,"abstract":"The objective of this research is to investigate the effects of rabbitfish (Siganus canaliculatus) existence in polyculture system and feed type against the growth performance of bigeye trevally (Caranx sexfasciatus) in floating net cage. Study on polyculture of bigeye trevally and rabbitfish and monoculture of bigeye trevally in the cage were conducted at the coastal of South Bolaang Mongondow, North Sulawesi, Indonesia in 2018. The experiment was designed with three treatments for bigeye trevally, namely: monoculture of bigeye trevally fed with fresh trash fish + corn oil 4% (Treatment A), polyculture of bigeye trevally and rabbitfish fed with fresh trash fish + corn oil 4% (Treatment B), polyculture of bigeye trevally and rabbitfish fed only fresh trash fish (Treatment C); On the other hand, 2 treatments for rabbitfish, namely: polyculture of rabbitfish and bigeye trevally which are fed with only carp pellets + fresh trash fish (1:1) (Treatment D) and polyculture of rabbitfish and bigeye trevally which are fed with carp pellets + fresh trash fish (1:1) + corn oil 4% (Treatment E). Each treatment consisted of 3 replications. The results show that the daily growth rates of bigeye trevally from treatment A, B, and C are 0.67%, 1% and 0.68% of body weight per day, while the daily growth rates of rabbitfish from treatment D and E are 0.56% and 0.81% of body weight per day, respectively. Feed conversion ratios of bigeye trevally from treatment A, B and C are 6.69, 4.86 and 6, while feed conversion ratios of rabbitfish from treatment D and E are 4.57 and 4.16, respectively. Rabbitfish existence in polyculture system and feed type gave a faster growth of bigeye trevally in the cage compared to the absence of both.","PeriodicalId":15243,"journal":{"name":"Journal of Aquaculture Research and Development","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86382717","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 : 2020-01-01DOI: 10.35248/2155-9546.20.11.595
J. E. Trigo, Meritxell Mondéjar
The observations carried out during the spring of 2014 on different Atlantic salmon (Salmo salar Linnaeus, 1758) sea farms around the island of Froya (Sor–Trondelag), Norway, served to lay the foundations for a totally natural and environmentally friendly method for removal salmon parasitic copepods known as sea lice. The method is based on two known data: the different stages of copepod larval development, some of which are free-living as part of plankton and the existence of marine invertebrates that feed on plankton and more specifically on zooplankton, that is, the animal part of the plankton that is where the copepod larvae are. If we combine these two facts, we obtain the main idea of the method: introducing marine invertebrate filter feeders in special devices (patent pending) inside the cages of the marine farms, it will only be necessary to let these invertebrates carry out their natural function of feeding based on copepod larvae, that is, when they are in their most vulnerable phase and in which they have not yet caused harm to the salmon. In this way, sea lice can be eliminated without the use of chemicals, medicines or methods that can cause unnecessary stress to salmon on sea farms.
{"title":"New Natural Method for the Elimination of Salmon Farms Parasite Copepods","authors":"J. E. Trigo, Meritxell Mondéjar","doi":"10.35248/2155-9546.20.11.595","DOIUrl":"https://doi.org/10.35248/2155-9546.20.11.595","url":null,"abstract":"The observations carried out during the spring of 2014 on different Atlantic salmon (Salmo salar Linnaeus, 1758) sea farms around the island of Froya (Sor–Trondelag), Norway, served to lay the foundations for a totally natural and environmentally friendly method for removal salmon parasitic copepods known as sea lice. The method is based on two known data: the different stages of copepod larval development, some of which are free-living as part of plankton and the existence of marine invertebrates that feed on plankton and more specifically on zooplankton, that is, the animal part of the plankton that is where the copepod larvae are. If we combine these two facts, we obtain the main idea of the method: introducing marine invertebrate filter feeders in special devices (patent pending) inside the cages of the marine farms, it will only be necessary to let these invertebrates carry out their natural function of feeding based on copepod larvae, that is, when they are in their most vulnerable phase and in which they have not yet caused harm to the salmon. In this way, sea lice can be eliminated without the use of chemicals, medicines or methods that can cause unnecessary stress to salmon on sea farms.","PeriodicalId":15243,"journal":{"name":"Journal of Aquaculture Research and Development","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77594599","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 : 2020-01-01DOI: 10.35248/2155-9546.19.10.598
Sheena M. Tagarao, C. Solania, J. Jumawan, S. G. Masangcay, L. Calagui
Length-weight relationship (LWR) and Reproductive phenology of Johnius borneensis (Bleeker, 1850) collected from Lower Agusan River was studied from the months of May 2017 to January 2018. Throughout the sampling period, a total of 304 specimens with 185 female and 119 males were examined and analyzed. The overall sex ratio is 2:1 with female preponderance. LWR of females showed positive allometric growth (b>3; p=0.0000) while male specimens followed negative allometric (b<3; p=0.000). Ovarian GSI showed to peak in reproduction during September. Fecundity-length and fecundity-weight shows low correlation coefficient in their relationship. J. borneensis had a short reproductive period with this it is highly recommended that fishing be strictly restricted during its spawning season (September) for this fish species to propagate their population in the area.
{"title":"Length-Weight Relationship (LWR), Gonadosomatic Index (GSI) and Fecundity of Johnius borneensis (Bleeker, 1850) from Lower Agusan River basin, Butuan City, Philippines","authors":"Sheena M. Tagarao, C. Solania, J. Jumawan, S. G. Masangcay, L. Calagui","doi":"10.35248/2155-9546.19.10.598","DOIUrl":"https://doi.org/10.35248/2155-9546.19.10.598","url":null,"abstract":"Length-weight relationship (LWR) and Reproductive phenology of Johnius borneensis (Bleeker, 1850) collected from Lower Agusan River was studied from the months of May 2017 to January 2018. Throughout the sampling period, a total of 304 specimens with 185 female and 119 males were examined and analyzed. The overall sex ratio is 2:1 with female preponderance. LWR of females showed positive allometric growth (b>3; p=0.0000) while male specimens followed negative allometric (b<3; p=0.000). Ovarian GSI showed to peak in reproduction during September. Fecundity-length and fecundity-weight shows low correlation coefficient in their relationship. J. borneensis had a short reproductive period with this it is highly recommended that fishing be strictly restricted during its spawning season (September) for this fish species to propagate their population in the area.","PeriodicalId":15243,"journal":{"name":"Journal of Aquaculture Research and Development","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91309400","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 : 2020-01-01DOI: 10.35248/2155-9546.19.10.593
Atiqur Rahman Sunny, Kazi Mohammad Masum, Nusrat S. Islam, Mizanur Rahman, Arifur Rahman, Jahurul Islam, S. Rahman, Kh., aker Jafor Ahmed, S. Prodhan
Fish and fishery resources play an important role in improving socio-economic status of the fishing communities. Sylhet, the haor (bowl or saucer shape shallow depression) dominated administrative divisions (encompassing RAMSAR site and Ecological Critical Wetland Area) of Bangladesh is very promising for freshwater capture fisheries. But very few studies focused on the overall status on livelihood sustainability of fishing communities in this region. This study identified the demography, livelihood strategy, constraints of fishing and their coping strategies, strength, weakness and opportunity of fishing communities using household questionnaires, oral history interviews, and focus group discussions in Sylhet division (north eastern region of Bangladesh). The study identified physical strength and intention to work all the year round as the key strengths and acute poverty, poor economy, lack of alternative income generating opportunity and reduced fish availability as common weakness of fishers. Major threats facing by the fishers were natural calamities, overexploitation, dependency on natural resources and improper policy implication. Scope of alternative income generating opportunities, training and motivational program among the resource users and community based fisheries management could improve the situation. Findings of this study would provide important guideline for wetland management, planning and development of livelihood sustainability of the fishing communities.
{"title":"Analyzing Livelihood Sustainability of Climate Vulnerable Fishers: Insight from Bangladesh","authors":"Atiqur Rahman Sunny, Kazi Mohammad Masum, Nusrat S. Islam, Mizanur Rahman, Arifur Rahman, Jahurul Islam, S. Rahman, Kh., aker Jafor Ahmed, S. Prodhan","doi":"10.35248/2155-9546.19.10.593","DOIUrl":"https://doi.org/10.35248/2155-9546.19.10.593","url":null,"abstract":"Fish and fishery resources play an important role in improving socio-economic status of the fishing communities. Sylhet, the haor (bowl or saucer shape shallow depression) dominated administrative divisions (encompassing RAMSAR site and Ecological Critical Wetland Area) of Bangladesh is very promising for freshwater capture fisheries. But very few studies focused on the overall status on livelihood sustainability of fishing communities in this region. This study identified the demography, livelihood strategy, constraints of fishing and their coping strategies, strength, weakness and opportunity of fishing communities using household questionnaires, oral history interviews, and focus group discussions in Sylhet division (north eastern region of Bangladesh). The study identified physical strength and intention to work all the year round as the key strengths and acute poverty, poor economy, lack of alternative income generating opportunity and reduced fish availability as common weakness of fishers. Major threats facing by the fishers were natural calamities, overexploitation, dependency on natural resources and improper policy implication. Scope of alternative income generating opportunities, training and motivational program among the resource users and community based fisheries management could improve the situation. Findings of this study would provide important guideline for wetland management, planning and development of livelihood sustainability of the fishing communities.","PeriodicalId":15243,"journal":{"name":"Journal of Aquaculture Research and Development","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79276910","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：