{"title":"Comparative study of growth rates, condition factors and natural mortality of Oreochromis niloticus fish from culture fisheries and capture fisheries at Lake Kariba, Zambia","authors":"Chinyama Makeche Mauris, Nhiwatiwa Tamuka, Chitondo Lufeyo, Kanyati Malvern, K. Cyprian, Kaminsa Chipasha, Kaona Mirriam, Ndebe Joseph, M. Malala, Sipho Khumalo Cynthia, Simulundu Edgar, C. Katendi, Chitanga Simba, Mubemba Benjamin, Muleya Walter, Makwelele Geofrey","doi":"10.5897/ijfa2023.0852","DOIUrl":"https://doi.org/10.5897/ijfa2023.0852","url":null,"abstract":"Oreochromis niloticus were sampled","PeriodicalId":415026,"journal":{"name":"International Journal of Fisheries and Aquaculture","volume":"89 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133751054","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}
E. Idowu, J. Oso, Agunbiade Razaq Olusola Abayomi, Joy Valentina Efemieyah
This study was conducted to determine the trophic relationship of Clarias gariepinus , Parachanna obscura , and Oreochromis niloticus collected from Ogbese River, Ado Ekiti, South-Western, Nigeria between June and September, 2017. The fish specimens were examined and their stomach contents analyzed. Numerical, frequency of occurrence and volumetric methods were employed in this study. The result of the analysis showed that C. gariepinus , P. obscura and O. niloticus fed on similar food items. These were mainly algae, nematode worms and insects. The stomach content of C. gariepinus consisted of animal and plant materials, planktons (phytoplankton and zooplankton) as well as detritus. The dominant animal material found was flying termite Cryptotermes species with 55.23% and plant material was maize seed with 16.62%. The stomach of P. obscura consists mainly of plant and animal materials, planktons and unidentified food items. Algae represented by Euglena species accounted for 66.67% and Nematode worm (22.22%) was the dominant animal material. The stomach of O. niloticus consisted of plant and animal materials, detritus and mud. Filamentous algae represented by Spirogyra spp. 75.42% was the dominant plant material. Thus, each species depended on more than one food source. However, overlaps existed, fishes were found to feed on more than one type of food item which reduced competition and encouraged coexistence. Based on the food items encountered for the period of study in the stomachs of C. gariepinus and P. obscura are omnivorous while O. niloticus is herbivorous in Ogbese River, Ado-Ekiti. The relative importance index (RI) showed that the most important food items in C. gariepinus , P. obscura and O. niloticus are insect (45.0%), algae (59.91%) and (62.42%), respectively .
{"title":"Trophic relationship of fish species in Ogbese River, Ado-Ekiti, South-Western, Nigeria","authors":"E. Idowu, J. Oso, Agunbiade Razaq Olusola Abayomi, Joy Valentina Efemieyah","doi":"10.5897/ijfa2020.0777","DOIUrl":"https://doi.org/10.5897/ijfa2020.0777","url":null,"abstract":"This study was conducted to determine the trophic relationship of Clarias gariepinus , Parachanna obscura , and Oreochromis niloticus collected from Ogbese River, Ado Ekiti, South-Western, Nigeria between June and September, 2017. The fish specimens were examined and their stomach contents analyzed. Numerical, frequency of occurrence and volumetric methods were employed in this study. The result of the analysis showed that C. gariepinus , P. obscura and O. niloticus fed on similar food items. These were mainly algae, nematode worms and insects. The stomach content of C. gariepinus consisted of animal and plant materials, planktons (phytoplankton and zooplankton) as well as detritus. The dominant animal material found was flying termite Cryptotermes species with 55.23% and plant material was maize seed with 16.62%. The stomach of P. obscura consists mainly of plant and animal materials, planktons and unidentified food items. Algae represented by Euglena species accounted for 66.67% and Nematode worm (22.22%) was the dominant animal material. The stomach of O. niloticus consisted of plant and animal materials, detritus and mud. Filamentous algae represented by Spirogyra spp. 75.42% was the dominant plant material. Thus, each species depended on more than one food source. However, overlaps existed, fishes were found to feed on more than one type of food item which reduced competition and encouraged coexistence. Based on the food items encountered for the period of study in the stomachs of C. gariepinus and P. obscura are omnivorous while O. niloticus is herbivorous in Ogbese River, Ado-Ekiti. The relative importance index (RI) showed that the most important food items in C. gariepinus , P. obscura and O. niloticus are insect (45.0%), algae (59.91%) and (62.42%), respectively .","PeriodicalId":415026,"journal":{"name":"International Journal of Fisheries and Aquaculture","volume":"71 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122825114","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}
Haragi Shivakumar, K. Prashant, N. Saavi, P. Rajeshree, H. Shreedevi, GB Sreekanth
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{"title":"Study on the Green Mussel, Perna viridis (L.) distribution, artificial spat collection, and raft culture along the Karwar Coast, Eastern Arabian Sea","authors":"Haragi Shivakumar, K. Prashant, N. Saavi, P. Rajeshree, H. Shreedevi, GB Sreekanth","doi":"10.5897/ijfa2023.0847","DOIUrl":"https://doi.org/10.5897/ijfa2023.0847","url":null,"abstract":".","PeriodicalId":415026,"journal":{"name":"International Journal of Fisheries and Aquaculture","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122049984","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}
Adékambi Désiré Adéyèmi, A. Kayodé, I. B. Chabi, C. M. B. Amoussou, L. FifamèEmeline, Fassinou, M. J. R. Nout, Anita R Linnemann
.
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{"title":"Process conditions for successful low-cost extrusion of floating fish feed granules for African catfish, Clarias gariepinus in West Africa","authors":"Adékambi Désiré Adéyèmi, A. Kayodé, I. B. Chabi, C. M. B. Amoussou, L. FifamèEmeline, Fassinou, M. J. R. Nout, Anita R Linnemann","doi":"10.5897/ijfa2022.0835","DOIUrl":"https://doi.org/10.5897/ijfa2022.0835","url":null,"abstract":".","PeriodicalId":415026,"journal":{"name":"International Journal of Fisheries and Aquaculture","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125307071","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}
Tia Iddrisu Fuseini, Ahunoabobirim Agya Bosompem, Esi. Edziyie Regina, Betey Campion Benjamin, Nsoh Akongyuure Daniel, Adjei-Boateng Daniel
The potential of irrigation reservoirs in northern Ghana to support Nile Tilapia ( Oreochromis niloticus ) production in 1 m 3 budget cages was assessed over six-months in three reservoirs (Bontanga, Golinga and Libga). Fingerlings with a mean weight of 17.0 ± 5.0 g were randomly stocked at 50, 100, 150, 200 and 250 fish per cage in duplicate and fed with a commercial tilapia feed (Raanan, 30% protein level) at 3 to 5% body weight. The results indicated that the lower densities (50 and 100 fish m -3 ) had a higher specific growth rate (SGR) compared to higher densities (150-250 fish m -3 ). The gross yield (7.5–23.1 kg cage -1 ) differed with increasing density on all reservoirs. Consumers in the Tamale Metropolis preferred small sized tilapias (5-6 fish kg -1 ) and were willing to pay US$ 1.40-2.34 kg -1 of fish, while restaurants preferred 2-3 fish kg -1 and were willing to pay US$ 3.27- 3.51 kg -1 . The 200 fish m -3 stocking density was the most profitable and is recommended for cage culture on reservoirs in northern Ghana.
{"title":"Assessing the impact of a budget cage technology on Nile Tilapia (Oreochromis niloticus) production in the Bontanga, Golinga and Libga reservoirs in Northern Ghana, Africa","authors":"Tia Iddrisu Fuseini, Ahunoabobirim Agya Bosompem, Esi. Edziyie Regina, Betey Campion Benjamin, Nsoh Akongyuure Daniel, Adjei-Boateng Daniel","doi":"10.5897/ijfa2021.0827","DOIUrl":"https://doi.org/10.5897/ijfa2021.0827","url":null,"abstract":"The potential of irrigation reservoirs in northern Ghana to support Nile Tilapia ( Oreochromis niloticus ) production in 1 m 3 budget cages was assessed over six-months in three reservoirs (Bontanga, Golinga and Libga). Fingerlings with a mean weight of 17.0 ± 5.0 g were randomly stocked at 50, 100, 150, 200 and 250 fish per cage in duplicate and fed with a commercial tilapia feed (Raanan, 30% protein level) at 3 to 5% body weight. The results indicated that the lower densities (50 and 100 fish m -3 ) had a higher specific growth rate (SGR) compared to higher densities (150-250 fish m -3 ). The gross yield (7.5–23.1 kg cage -1 ) differed with increasing density on all reservoirs. Consumers in the Tamale Metropolis preferred small sized tilapias (5-6 fish kg -1 ) and were willing to pay US$ 1.40-2.34 kg -1 of fish, while restaurants preferred 2-3 fish kg -1 and were willing to pay US$ 3.27- 3.51 kg -1 . The 200 fish m -3 stocking density was the most profitable and is recommended for cage culture on reservoirs in northern Ghana.","PeriodicalId":415026,"journal":{"name":"International Journal of Fisheries and Aquaculture","volume":"38 4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125927468","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 preliminary study was carried out to formulate high quality least-cost feed for the farming of African catfish ( Clarias gariepinus Burchell 1822) in Sierra Leone. Locally sourced feed ingredients with vitamin premixes, lysine and methionine were used to formulate a 45% crude protein feeds for the African catfish. Proximate contents determined for the practical feed were compared with two imported commercially produced feeds (Ranaan feed and Aller Aqua). Mean proximate values for protein, moisture, fat, fibre, ash and dry matter were 40.59 ± 2.22 to 42.16 ± 2.31%, 21.39 ± 0.23 to 22.77 ± 0.16, 0.30 ± 0.07 to 1.07 ± 0.04, 2.81 ± 0.14 to 3.28 ± 0.15%, 16.62 ± 0.06 to 17.60 ± 0.13%), and 77.22 ± 0.16 to 78.61 ± 0.23%, respectively. P in µg/g, Na in µg/g and percentage Ca were the minerals determined. Some of the values obtained, compared favourably with Ranaan and Aller Aqua at a cheaper cost. This study has shown that it is possible to develop a least-cost and nutrient rich feed for commercialization in Sierra Leone.
{"title":"Development of fish feeds for African catfish (Clarias gariepinus Burchell 1822) farming in Sierra Leone, West Africa","authors":"O. J. Olapade, P. Saboleh","doi":"10.5897/ijfa2022.0837","DOIUrl":"https://doi.org/10.5897/ijfa2022.0837","url":null,"abstract":"This preliminary study was carried out to formulate high quality least-cost feed for the farming of African catfish ( Clarias gariepinus Burchell 1822) in Sierra Leone. Locally sourced feed ingredients with vitamin premixes, lysine and methionine were used to formulate a 45% crude protein feeds for the African catfish. Proximate contents determined for the practical feed were compared with two imported commercially produced feeds (Ranaan feed and Aller Aqua). Mean proximate values for protein, moisture, fat, fibre, ash and dry matter were 40.59 ± 2.22 to 42.16 ± 2.31%, 21.39 ± 0.23 to 22.77 ± 0.16, 0.30 ± 0.07 to 1.07 ± 0.04, 2.81 ± 0.14 to 3.28 ± 0.15%, 16.62 ± 0.06 to 17.60 ± 0.13%), and 77.22 ± 0.16 to 78.61 ± 0.23%, respectively. P in µg/g, Na in µg/g and percentage Ca were the minerals determined. Some of the values obtained, compared favourably with Ranaan and Aller Aqua at a cheaper cost. This study has shown that it is possible to develop a least-cost and nutrient rich feed for commercialization in Sierra Leone.","PeriodicalId":415026,"journal":{"name":"International Journal of Fisheries and Aquaculture","volume":"71 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130322972","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}
Food is necessary for good health as well as the social and political stability of the society. Fish food provides essential nourishment especially proteins of high biological values. It is highly nutritious, tasty and easily digestive. Enterprise budgeting and descriptive statistics were used to estimate the value of smallholder aquaculture systems on a census population using a semi-structured questionnaire in the South West Region of Cameroon, Africa. It was established that aquaculture is a marginal activity in the region with less than 41 active farmers. 100% of the famers were male with 84.4% above 45 years and 71.9% of them had more than primary level education. The farmers produce only Tilapia (34 tons) and Catfish (49 tons) mainly in small sized pond with statistical mode of 25 m2. All the aquaculture productive systems, extensive, semi-intensive and intensive systems were profitable and significantly different from zero (P <0.01). The variable costs of all the systems were more than 50% to total cost indicating little investment in modern technologies, rendering them traditional. The farmers, therefore, had potentials to increase productivity with targeted training and increase accessibility to fingerlings. However, it was concluded that since aquaculture is profitable, an enabling policy is necessary to increase participation of farmers especially women and youth in order to empower them economically. Key words: Aquaculture, production systems, cost benefit analysis, Cameroon.
{"title":"Cost-benefit analysis for small-scale aquaculture production systems: A case of South West Region of Cameroon, Africa","authors":"Majory O. Meliko, Siri B. Ngoh, J. Okolle","doi":"10.5897/IJFA2020.0785","DOIUrl":"https://doi.org/10.5897/IJFA2020.0785","url":null,"abstract":"Food is necessary for good health as well as the social and political stability of the society. Fish food provides essential nourishment especially proteins of high biological values. It is highly nutritious, tasty and easily digestive. Enterprise budgeting and descriptive statistics were used to estimate the value of smallholder aquaculture systems on a census population using a semi-structured questionnaire in the South West Region of Cameroon, Africa. It was established that aquaculture is a marginal activity in the region with less than 41 active farmers. 100% of the famers were male with 84.4% above 45 years and 71.9% of them had more than primary level education. The farmers produce only Tilapia (34 tons) and Catfish (49 tons) mainly in small sized pond with statistical mode of 25 m2. All the aquaculture productive systems, extensive, semi-intensive and intensive systems were profitable and significantly different from zero (P <0.01). The variable costs of all the systems were more than 50% to total cost indicating little investment in modern technologies, rendering them traditional. The farmers, therefore, had potentials to increase productivity with targeted training and increase accessibility to fingerlings. However, it was concluded that since aquaculture is profitable, an enabling policy is necessary to increase participation of farmers especially women and youth in order to empower them economically. \u0000 \u0000 Key words: Aquaculture, production systems, cost benefit analysis, Cameroon.","PeriodicalId":415026,"journal":{"name":"International Journal of Fisheries and Aquaculture","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126569942","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 cage farming was first introduced in Lake Victoria in 2005, however, its adoption and production has not met expectations. It is a promising venture that can help solve the problems of food insecurity, unemployment and alleviate poverty if, a conducive investment environment is put in place. This study sought to explore the adoption determinants, challenges and opportunities of this technology within the Lake Victoria shoreline. Using a cross-sectional survey, a questionnaire was administered to 100 respondents along the Lake Victoria beaches in Bondo Sub County of western Kenya. Data were analyzed using a Probit model. Gender, credit access, training, were major determinants of cage adoption while market, quality seed and feed, high investment cost, policy framework, insecurity were found to be major challenges. Nevertheless, dwindling wild capture, growing market and changing lifestyle, government initiatives such as Big Four Agenda and Blue Economy were the emerging opportunities identified in the region. Conclusively, solving the challenges would help prospective investors take advantage of the opportunities thus enhancing adoption. Key Words: Aquaculture, food security, livelihood
{"title":"Cage fish culture in the lake victoria region: Adoption determinants, challenges and opportunities","authors":"M. Orinda, E. Okuto, Martin Abwao","doi":"10.5897/ijfa2020.0798","DOIUrl":"https://doi.org/10.5897/ijfa2020.0798","url":null,"abstract":"Fish cage farming was first introduced in Lake Victoria in 2005, however, its adoption and production has not met expectations. It is a promising venture that can help solve the problems of food insecurity, unemployment and alleviate poverty if, a conducive investment environment is put in place. This study sought to explore the adoption determinants, challenges and opportunities of this technology within the Lake Victoria shoreline. Using a cross-sectional survey, a questionnaire was administered to 100 respondents along the Lake Victoria beaches in Bondo Sub County of western Kenya. Data were analyzed using a Probit model. Gender, credit access, training, were major determinants of cage adoption while market, quality seed and feed, high investment cost, policy framework, insecurity were found to be major challenges. Nevertheless, dwindling wild capture, growing market and changing lifestyle, government initiatives such as Big Four Agenda and Blue Economy were the emerging opportunities identified in the region. Conclusively, solving the challenges would help prospective investors take advantage of the opportunities thus enhancing adoption. \u0000 \u0000 Key Words: Aquaculture, food security, livelihood","PeriodicalId":415026,"journal":{"name":"International Journal of Fisheries and Aquaculture","volume":"212 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117311772","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. Julius, Kpundeh Mathew Didlyn, Quinn Patrick George, Nyuma Grace Janet Yawa
Fish and fish products bear potential hazards and risks of public health concern. A preliminary study of hazards, injuries and risks among fisherfolk in Tombo, Sierra Leone, West Africa was carried out on November 2018. Sixty subjects from among the organized fish processor groups were interviewed with semi-structured questionnaire. Results obtained from the study were analyzed with Microsoft Excel and presented in tables and charts. The results of the study indicated that females (56.7%) were more involved in fish processing than males (41.7%); and the active age of these processors fell in the age range of 35-45 years. Married people (71.7%), dominated singles, widowed and divorced put together. Dominant religion in the study area was Islam and Christianity. Smoking (hot and cold), frying, packing, icing, filleting, seasoning or the combination of two or more according to the subjects was the prevailing processing methods used by processors in Tombo. Inherent hazards, injuries and risks reported by the respondents included high blood pressure, cardiovascular disease, nervous tension, insomnia, skin disease, bronchitis or asthma, muscular problems or those of the joint, long-term neck and back pains, eye problem, typhoid, malaria, and hearing problem caused by environmental noise. To mitigate the hazard and risks associated with fish processing in Tombo, training on appropriate fish handling and processing techniques; the provision of appropriate handling and processing equipment by responsible stakeholders were considered according to the subjects rational options. Key words: Occupation, hazards, injuries, risks, fish processors, Tombo, Sierra Leone.
{"title":"Occupational hazards, risk and injuries of fish processors in Tombo a coastal fish landing site, Sierra Leone, West Africa","authors":"O. Julius, Kpundeh Mathew Didlyn, Quinn Patrick George, Nyuma Grace Janet Yawa","doi":"10.5897/IJFA2020.0770","DOIUrl":"https://doi.org/10.5897/IJFA2020.0770","url":null,"abstract":"Fish and fish products bear potential hazards and risks of public health concern. A preliminary study of hazards, injuries and risks among fisherfolk in Tombo, Sierra Leone, West Africa was carried out on November 2018. Sixty subjects from among the organized fish processor groups were interviewed with semi-structured questionnaire. Results obtained from the study were analyzed with Microsoft Excel and presented in tables and charts. The results of the study indicated that females (56.7%) were more involved in fish processing than males (41.7%); and the active age of these processors fell in the age range of 35-45 years. Married people (71.7%), dominated singles, widowed and divorced put together. Dominant religion in the study area was Islam and Christianity. Smoking (hot and cold), frying, packing, icing, filleting, seasoning or the combination of two or more according to the subjects was the prevailing processing methods used by processors in Tombo. Inherent hazards, injuries and risks reported by the respondents included high blood pressure, cardiovascular disease, nervous tension, insomnia, skin disease, bronchitis or asthma, muscular problems or those of the joint, long-term neck and back pains, eye problem, typhoid, malaria, and hearing problem caused by environmental noise. To mitigate the hazard and risks associated with fish processing in Tombo, training on appropriate fish handling and processing techniques; the provision of appropriate handling and processing equipment by responsible stakeholders were considered according to the subjects rational options. \u0000 \u0000 Key words: Occupation, hazards, injuries, risks, fish processors, Tombo, Sierra Leone.","PeriodicalId":415026,"journal":{"name":"International Journal of Fisheries and Aquaculture","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125388406","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}
Alex J. Rosburg, Cameron Enright, J. Voorhees, M. E. Barnes
To evaluate the effects of water hardness on survival to hatch of eyed rainbow trout Oncorhynchus mykiss eggs during iodophor disinfection, hard (300 mg/L CaCl2) and soft water (20 mg/L CaCl2) solutions were used in combination with iodophor treatments of 0, 100, 200, 400, 800, and 1600 mg/L. Water hardness did not significantly influence egg survival-to-hatch. In addition, there was no significant interaction between water hardness and iodine concentration on egg survival. However, significant differences in egg survival due to iodine concentration were observed. Egg survival significantly decreased at 800 mg/L, with near complete mortality occurring at 1,600 mg/L. Rainbow trout eyed egg disinfection using iodine concentrations of 800 mg/L or greater are not recommended, regardless of water hardness (calcium) concentrations. Keywords: Eyed eggs, iodophor, disinfection, rainbow trout, water hardness, mortality.
{"title":"Water hardness does not influence iodine-induced mortality of rainbow trout eyed eggs","authors":"Alex J. Rosburg, Cameron Enright, J. Voorhees, M. E. Barnes","doi":"10.5897/IJFA2021.0804","DOIUrl":"https://doi.org/10.5897/IJFA2021.0804","url":null,"abstract":"To evaluate the effects of water hardness on survival to hatch of eyed rainbow trout Oncorhynchus mykiss eggs during iodophor disinfection, hard (300 mg/L CaCl2) and soft water (20 mg/L CaCl2) solutions were used in combination with iodophor treatments of 0, 100, 200, 400, 800, and 1600 mg/L. Water hardness did not significantly influence egg survival-to-hatch. In addition, there was no significant interaction between water hardness and iodine concentration on egg survival. However, significant differences in egg survival due to iodine concentration were observed. Egg survival significantly decreased at 800 mg/L, with near complete mortality occurring at 1,600 mg/L. Rainbow trout eyed egg disinfection using iodine concentrations of 800 mg/L or greater are not recommended, regardless of water hardness (calcium) concentrations. \u0000 \u0000 Keywords: Eyed eggs, iodophor, disinfection, rainbow trout, water hardness, mortality.","PeriodicalId":415026,"journal":{"name":"International Journal of Fisheries and Aquaculture","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131220063","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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