Influence of water exchange rates on fingerling production in Indian major carps in large outdoor concrete tanks |
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| Institution: | 1. ICAR-Central Institute of Freshwater Aquaculture, Kausalyaganga, Bhubaneswar 751002, India;2. ICAR-Central Inland Fisheries Research Institute, Barrackpore, West Bengal, India;1. Fisheries Engineering Research Division, National Institute of Fisheries Science, 216, Gijang-haeanro, Gijang-eup, Gijang-gun, Busan, 46083, Republic of Korea;2. Department of Marine Production Management, Chonnam National University, 50 Daehak-ro, Yeosu, Jeollananm-Do, 59626, Republic of Korea;3. Division of Marine Production System Management, Pukyong National University, 45 Yongso-ro, Busan, 48513, Republic of Korea;1. College of Ocean Engineering, Guangdong Ocean University, Guangdong 524088, China;2. College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China;3. Centre for Marine Technology and Ocean Engineering (CENTEC), Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisboa, Portugal;1. Environmental and Fisheries Sciences Division, Northwest Fisheries Science Center, National Marine Fisheries Service, National Oceanic and Atmospheric Administration, 2725 Montlake Blvd. East, Seattle, WA 98112, USA;2. Aquaculture Management Services, 1250 Sunset Grove Roads, Fallbrook, CA 92028, USA;1. Shiogama Station, Fisheries Stock Assessment Center, Fisheries Resources Institute, Japan Fisheries Research and Education Agency, Shinhama-cho, Shiogama, Miyagi 985–0001, Japan;2. PROTO solution, CO., LTD., 1–3-45 Shintera, Wakabayashi-ku, Miyagi 984–0051, Japan;3. Miyagi Prefecture Fisheries and Forestry Administration Department, Honcho Aoba-ku Sendai, Miyagi, 980–8570, Japan;4. IDDK, Inc., 1–12-8, Tomioka, Koto-ku, Tokyo 135–0047, Japan;5. ANDEX, Inc., 1–3-2, Omachi, Aoba-ku, Miyagi 980–0804, Japan;6. Miyagi Prefecture Fisheries Technology Institute, Watanoha, Sodenohama, Ishinomaki, Miyagi 986–2135, Japan;1. College of Information and Electrical Engineering, China Agricultural University, Beijing 100083, China;2. National Innovation Center for Digital Fishery, China Agricultural University, Beijing 100083, China;3. Key Laboratory of Agricultural Information Acquisition Technology, China Agricultural University, Beijing 100083, China;4. Ningbo Institute of Oceanography and Fisheries, Zhejiang 315000, China;1. School of Communication Engineering, Hangzhou Dianzi University, Hangzhou, 310018, China;2. Zhejiang Institute of Freshwater Fisheries, Huzhou, 313001, China |
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| Abstract: | Influence of varied water exchange (total of 0%, 40%, 60%, 80% and 100% in four phases during three months) on fingerling production of Indian major carps-catla, rohu and mrigal under polyculture was evaluated in large outdoor concrete tanks (50 m2). Rearing density of 30 fry m−3 was used. Survival in the control tanks reduced during the 2nd month unlike the treatments, attributed to lack of water exchange in the tanks. While no marked variation in water quality was observed among the control and treatments, graded water exchange led to proportionate improvement in the fingerling performance in terms of survival and growth in the treatments. Harvested total lengths of fingerlings were similar in all, irrespective of varied exchange levels. Although no significant variation in net weight gain (NWG) and specific growth rate (SGR) were observed among the treatments during 1st and 2nd months of rearing in any of the species, these attributes increased significantly during 3rd month with higher water exchange in treatments. The harvested body weight (HBW) also increased significantly with increased exchange level. However, survival, HBW, NWG and SGR remained similar in all species between the 80% and 100% water exchange levels. Treatment with 80% water exchange had higher water productivity in terms of number and biomass production of fingerlings per unit (m−3) of TWU and CWU for which, the study recommended 80% to be the ideal total water exchange required for fingerling production of IMC in concrete tanks. |
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| Keywords: | Fingerling production IMC Growth Survival Water exchange |
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