The study was conducted to assess the fishery, challenges and opportunities in Denbi reservoir, Ethiopia. Interview, focus group discussion and personal observations were used to generate data. Response was solicited from households within the catchment area of the reservoir, key informants, elders, workers of the reservoir and fishery cooperative members. The data was analyzed by combining quantitative, qualitative methods and descriptive statistics. The result showed that there was one legally registered fishery cooperative organization. Majority (81.8%) of the cooperatives members organized were men with age ranging from 18 to 35 years. It was observed that there was division of labor among men and women cooperative members where men generally did capturing and women were involved in washing mesh, processing, transporting and selling of fish. Fishing in the reservoir was carried out each other day using non-motorized single boats. The post harvest activities undertaken by the fishermen included gutting and removal of offal from fish. The demand for the fish was neither affected by season nor religious affiliation due to the low supply of fish in the study area. Lack of fishing gear and motorized boat were the top two ranked constraints. Fish production and fishery system of Denbi reservoir was characterized by low inputs and low production resulting in an underutilization of the water resource. There should be emphasis on integrated management for effective utilization of the resources. Key words: Constraints, Denbi reservoir, fish, fishing practices, opportunities.
{"title":"Assessment of the fishery, challenges and opportunities of Denbi reservoir in Bench Maji Zone, South Western part of Ethiopia","authors":"G Askale, Michael, Tegegn Fantahun","doi":"10.5897/IJFA2018.0692","DOIUrl":"https://doi.org/10.5897/IJFA2018.0692","url":null,"abstract":"The study was conducted to assess the fishery, challenges and opportunities in Denbi reservoir, Ethiopia. Interview, focus group discussion and personal observations were used to generate data. Response was solicited from households within the catchment area of the reservoir, key informants, elders, workers of the reservoir and fishery cooperative members. The data was analyzed by combining quantitative, qualitative methods and descriptive statistics. The result showed that there was one legally registered fishery cooperative organization. Majority (81.8%) of the cooperatives members organized were men with age ranging from 18 to 35 years. It was observed that there was division of labor among men and women cooperative members where men generally did capturing and women were involved in washing mesh, processing, transporting and selling of fish. Fishing in the reservoir was carried out each other day using non-motorized single boats. The post harvest activities undertaken by the fishermen included gutting and removal of offal from fish. The demand for the fish was neither affected by season nor religious affiliation due to the low supply of fish in the study area. Lack of fishing gear and motorized boat were the top two ranked constraints. Fish production and fishery system of Denbi reservoir was characterized by low inputs and low production resulting in an underutilization of the water resource. There should be emphasis on integrated management for effective utilization of the resources. \u0000 \u0000 Key words: Constraints, Denbi reservoir, fish, fishing practices, opportunities.","PeriodicalId":415026,"journal":{"name":"International Journal of Fisheries and Aquaculture","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130101548","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}
{"title":"Is the culture of exotic fish species the answer to low fish productivity? A case study on the use of Oreochromis niloticus in Zambia","authors":"Shula Kefi Alexander, M. John","doi":"10.5897/ijfa2018.0703","DOIUrl":"https://doi.org/10.5897/ijfa2018.0703","url":null,"abstract":"","PeriodicalId":415026,"journal":{"name":"International Journal of Fisheries and Aquaculture","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131472040","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}
{"title":"Otolith morphometry and fish length relation of Amblypharyngodon mola (Ham.) from Middle Ganga region (India)","authors":"Nimesh Neetu, J. Seema","doi":"10.5897/ijfa2018.0698","DOIUrl":"https://doi.org/10.5897/ijfa2018.0698","url":null,"abstract":"","PeriodicalId":415026,"journal":{"name":"International Journal of Fisheries and Aquaculture","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114189417","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}
Delmonte Barbara, Pierro Mendonca Pedro, Borges Deminicis Bruno, Del Caro Selvatici Paula, Gomes da Silveira Deminicis Renata
{"title":"Performance of Nile tilapia (Oreochromis niloticus) fed with diets containing caffeine","authors":"Delmonte Barbara, Pierro Mendonca Pedro, Borges Deminicis Bruno, Del Caro Selvatici Paula, Gomes da Silveira Deminicis Renata","doi":"10.5897/ijfa2018.0690","DOIUrl":"https://doi.org/10.5897/ijfa2018.0690","url":null,"abstract":"","PeriodicalId":415026,"journal":{"name":"International Journal of Fisheries and Aquaculture","volume":"28 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120845269","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 aims to investigate the use of clove oil as an anaesthetic agent for Heterobranchus bidorsalis juveniles and assess the effects on the test fish, using some hematological parameters. Different concentrations of clove oil (0.8 to 1.2 ppm) were used in static water to determine the induction time and recovery time of the test organisms. Behavioral changes of the test fish were observed, the time the fish became immobilized and recovery from anaesthesia was recorded. The results showed erratic swimming, loss of equilibrium, loss of body movement with continued operculum movements, and loss of reflex of the test organisms during the period of exposure at higher concentrations (1.0 to 1.2 ppm) of clove oil. The physiological stress responses of H. bidorsalis juveniles increase when compared with fish in the control experiment. The induction time (119 s) significantly decreased with increasing concentrations of clove oil (1.2 ppm), while the recovery times ranged between 180 to 906 s from lower concentration (0.8 ppm) of clove oil to the highest concentrations (1.2 ppm).There was a positive linear effect (R2=0.95, P<0.05) between the concentration of clove oil and the induction time. The values obtained from hematological responses of the test organisms exposed to different concentrations of clove oil showed that the clove oil caused a concentration dependent changes in the blood of H. bidorsalis juveniles with significant reduction (P<0.05) in the values of packed cell volume (PCV) (26.00 to 16.00), haemoglobin (Hb) (8.70 to 5.90), mean corpuscular volume (MCV) (130.00 to 70.70) and the values of mean corpuscular haemoglobin (MCH) (38.61 to 32.41), and white blood cell (WBC) (29.50 to 73.50) increased significantly (P<0.05) with increasing concentrations of clove oil, while the values of red blood cell (RBC) and mean cell haemoglobin concentration (MCHC) varies with no definite pattern. Clove oil could be used as anaesthetic agent in fisheries because the induction and recovery times were within the recommendation range used in fishery management and does not pose any environmental hazard. Key words: Heterobranchus bidorsalis, clove oil, anaesthetic effect, haematology examination, induction time, recovery time.
{"title":"Anaesthetic effects and haematological responses of heterobranchus bidorsalis juveniles exposed to \u0000clove oil","authors":"M. Olufayo, O. Ojo","doi":"10.5897/IJFA2016.0590","DOIUrl":"https://doi.org/10.5897/IJFA2016.0590","url":null,"abstract":"This study aims to investigate the use of clove oil as an anaesthetic agent for Heterobranchus bidorsalis juveniles and assess the effects on the test fish, using some hematological parameters. Different concentrations of clove oil (0.8 to 1.2 ppm) were used in static water to determine the induction time and recovery time of the test organisms. Behavioral changes of the test fish were observed, the time the fish became immobilized and recovery from anaesthesia was recorded. The results showed erratic swimming, loss of equilibrium, loss of body movement with continued operculum movements, and loss of reflex of the test organisms during the period of exposure at higher concentrations (1.0 to 1.2 ppm) of clove oil. The physiological stress responses of H. bidorsalis juveniles increase when compared with fish in the control experiment. The induction time (119 s) significantly decreased with increasing concentrations of clove oil (1.2 ppm), while the recovery times ranged between 180 to 906 s from lower concentration (0.8 ppm) of clove oil to the highest concentrations (1.2 ppm).There was a positive linear effect (R2=0.95, P<0.05) between the concentration of clove oil and the induction time. The values obtained from hematological responses of the test organisms exposed to different concentrations of clove oil showed that the clove oil caused a concentration dependent changes in the blood of H. bidorsalis juveniles with significant reduction (P<0.05) in the values of packed cell volume (PCV) (26.00 to 16.00), haemoglobin (Hb) (8.70 to 5.90), mean corpuscular volume (MCV) (130.00 to 70.70) and the values of mean corpuscular haemoglobin (MCH) (38.61 to 32.41), and white blood cell (WBC) (29.50 to 73.50) increased significantly (P<0.05) with increasing concentrations of clove oil, while the values of red blood cell (RBC) and mean cell haemoglobin concentration (MCHC) varies with no definite pattern. Clove oil could be used as anaesthetic agent in fisheries because the induction and recovery times were within the recommendation range used in fishery management and does not pose any environmental hazard. \u0000 \u0000 Key words: Heterobranchus bidorsalis, clove oil, anaesthetic effect, haematology examination, induction time, recovery time.","PeriodicalId":415026,"journal":{"name":"International Journal of Fisheries and Aquaculture","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125690034","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}
{"title":"Seasonality in the photosynthetic productivity and biomass of phytoplankton in Lake Tinishu Abaya (Rift Valley, Ethiopia): The basis for fish production","authors":"Enawgaw Yirga, Lemma Brook","doi":"10.5897/ijfa2017.0651","DOIUrl":"https://doi.org/10.5897/ijfa2017.0651","url":null,"abstract":"","PeriodicalId":415026,"journal":{"name":"International Journal of Fisheries and Aquaculture","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117268670","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}
{"title":"Observations on the biology of Nile tilapia, Oreochromis niloticus L., in Tekeze Reservoir, Northern Ethiopia","authors":"T. Tsegay, Zebib Haftom, M. Tesfay","doi":"10.5897/ijfa2017.0637","DOIUrl":"https://doi.org/10.5897/ijfa2017.0637","url":null,"abstract":"","PeriodicalId":415026,"journal":{"name":"International Journal of Fisheries and Aquaculture","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128898246","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}
{"title":"Physical, chemical parameters and plankton in a tropical earthen pond catfish farm in Badagry, Nigeria","authors":"Agenuma Anetekhai Martins, Oritseweyinmi Clarke Edwin, Adebisi Osodein Oluwayemisi, Tolulope Dairo Morenikeji","doi":"10.5897/ijfa2017.0632","DOIUrl":"https://doi.org/10.5897/ijfa2017.0632","url":null,"abstract":"","PeriodicalId":415026,"journal":{"name":"International Journal of Fisheries and Aquaculture","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124728454","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}
Gbai Medard, Ouattara N’Golo, Bamba Yacouba, O. Mamadou, Ouattara F. Allassane, Y. Kouakou
{"title":"Substitution of the fish meal by the earthworm and maggot meal in the feed of Nile tilapia Oreochromis niloticus reared in freshwater","authors":"Gbai Medard, Ouattara N’Golo, Bamba Yacouba, O. Mamadou, Ouattara F. Allassane, Y. Kouakou","doi":"10.5897/ijfa2018.0682","DOIUrl":"https://doi.org/10.5897/ijfa2018.0682","url":null,"abstract":"","PeriodicalId":415026,"journal":{"name":"International Journal of Fisheries and Aquaculture","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114164741","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}
{"title":"Zooplankton communities as an indicator of ecosystem productivity in Lake Tinishu Abaya, Rift Valley, Ethiopia","authors":"Enawgaw Yirga, Lemma Brook","doi":"10.5897/ijfa2018.0675","DOIUrl":"https://doi.org/10.5897/ijfa2018.0675","url":null,"abstract":"","PeriodicalId":415026,"journal":{"name":"International Journal of Fisheries and Aquaculture","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124442382","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：