Prolonged photoperiod improves the growth performance for a hatchery reared right-eyed flatfish |
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| Institution: | 1. Department of Biology and Centre for Coastal Studies and Aquaculture, University of New Brunswick, Ganong Hall, P. O. Box 5050, Saint John, New Brunswick E2L 4L5, Canada;2. School of Fisheries, Aquaculture and Aquatic Sciences, Auburn University, Auburn, Alabama, USA;3. Department of Fisheries Science, Faculty of Natural Resources, University of Kurdistan, Sanandaj, Iran;4. National Institute of Aquatic Resources, Technical University of Denmark, Lyngby, Denmark;5. Billund Aquaculture, Montanavej 2, DK-7190 Billund, Denmark;6. Mount Allison University, 62 York Street, Sackville, New Brunswick E4L 1E2, Canada;1. Dept. of Civil and Environmental Engineering, University of Alberta, Edmonton, AB, T6G 2R3, Canada;2. Engineering College, Ocean University of China, Qingdao, 266100, China;3. Shandong Province Key Laboratory of Ocean Engineering, Ocean University of China, Qingdao, 266100, China;1. Craft & Hawkins, Department of Petroleum Engineering, Louisiana State University, 3207 Patrick F. Taylor Hall, Baton Rouge, LA, 70803, USA;2. Department of Biological & Agricultural Engineering, Louisiana State University, 149 E. B. Doran Building, Baton Rouge, LA, 70803, USA;3. Aquatic Germplasm and Genetic Resources Center, School of Renewable Natural Resources, Louisiana State University Agricultural Center, 2288 Gourrier Avenue, Baton Rouge, LA, 70820, USA;1. North Carolina State University, Department of Biological and Agricultural Engineering, Raleigh, NC, United States;2. North Carolina State University, Department of Civil, Construction, and Environmental Engineering, Raleigh, NC, United States;1. Fisheries and Oceans Canada, Gulf Fisheries Centre, 343 Université Ave., Moncton, NB, E1C 9B6, Canada;1. Associate Professor & Head, Department of Aquacultural Engineering, College of Fisheries Engineering, Tamil Nadu Fisheries University, Muttam Panangudi, Nagapattianam, 611002, India;2. Professor & Associate Dean, School of Civil Engineering, KIIT University, Bhubaneswar, Odisha, India;3. Assistant Professor (Rtd), Agricultural and Food Engineering Department, Indian Institute of Technology, Kharagpur, 721302, West Bengal, India |
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| Abstract: | Rearing winter flounder (Pseudopleuronectes americanus) in captivity for aquaculture and stock enhancement is a viable option to relieve fishing pressure and aid in ongoing recovery strategies. The objective of this study was to determine the effect of photoperiod on growth and survival of young-of-the-year juvenile winter flounder. Juveniles were reared for 12 weeks at three photoperiods: 24 light/0 dark, 18 light/6 dark, and 12 light/12 dark. Twenty fish were stocked into each of 18 enclosures with six enclosures per treatment. Fish in all treatments were fed to satiation every four hours. All fish were imaged at stocking and at three-week intervals. Growth was measured as changes in standard length (SL) and body area (BA). As early as Week 3, fish in all treatments were significantly different in terms of SL and BA. In general, fish grown under continuous 24 light were the largest and fish in the 12 light/12 dark regime were the smallest. Maximum specific growth rates of 0.41 % per day for SL and 0.83 % per day for BA were achieved in the 24 light/0 dark photoperiod. Average mortality rate over the course of the experiment was 9.17 % and there were no significant differences in the number of dead fish among the treatments. In conclusion, this study demonstrates that a longer day coupled with available food will increase growth rate for winter flounder juveniles, without affecting survival. By extending the photoperiod, growth in young-of-the year winter flounder is accelerated, bringing the growth rate of winter flounder close to that of other commercially produced flatfish. |
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| Keywords: | Aquaculture Juvenile Growth Metamorphosis Survival |
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