Effects of Stocking Density, Salinity, and Light Intensity on Growth and Survival of Southern Flounder Paralichthys lethostigma Larvae

Journal of the World Aquaculture Society - Tập 27 Số 2 - Trang 153-159 - 1996
Harry V. Daniels1, David L. Berlinsky2,3, Ronald G. Hodson4, Craig V. Sullivan5
1North Carolina State University. Department of Zoology, Vernon G. James Research and Extension Center, 207 Research Station Road, Plymouth, North Carolina 27962 USA
2Present address.
3University of Rhode Island, Department of Fisheries, Animal and Veterinary Science, East Farm Building 14, Rt. 108, Kingston, Rhode Island 02881 USA
4North Carolina Sea Grant Program, Box 8605, North Carolina State University, Raleigh, North Carolina 27695 USA
5North Carolina State University, Department of Zoology, Box 7616, Raleigh, North Carolina 27695 USA

Tóm tắt

AbstractFour separate studies were done on Southern flounder Paralichthys lethostigma larvae during first feeding and metamorphosis to determine the effects of stocking density, salinity, and light intensity on growth and survival. One study used stocking densities of 10, 20, 40, and 80 fish/L during first feeding; the second study compared the growth and survival of larvae stocked at 20 and 33 ppt; and a third experiment evaluated stocking densities of 1/L and 3/L under two different light intensities (1,600 lux vs 340 lux) during metamorphosis. The fourth experiment tested the effects of different salinities (0, 10, 20 and 30 ppt) on larval growth and survival during metamorphosis. Growth and survival (overall 6.9%) were not significantly different (P > 0.05) for stocking rates up to 80/L. Larvae placed into 20 ppt salinity had survival through first feeding similar to that of larvae raised at 33 ppt. During metamorphosis, light intensity had no effect (P > 0.05) on growth or survival, but fish stocked at 3/L had significantly lower (P < 0.05) survival than fish at 1/L. Complete mortality of larvae occurred at 0 ppt. Growth and survival past metamorphosis were not significantly different (P > 0.05) at 10, 20 and 30 ppt, but unmetamorphosed fish did not survive to day 60 at 10 ppt. Based on these results, practical larviculture of Southern flounder may require a two‐step process with high stocking rates (80 fish/L) through first feeding and lower densities (1/L) through metamorphosis. Fingerling production in fertilized nursery ponds might he possible at salinity as low as 20 ppt.

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