Pond nursery production of southern flounder (Paralichthys lethostigma) and weaning to commercial diets.

摘要

Southern flounder, P. lethostigma, were spawned during March 1997, and 4-day post-hatch larvae (mean total length = 2.0± 0.1 mm) were stocked into two 0.1-ha ponds at a density of 74/m2. At stocking, water temperature was 20deg C and salinity 30 ppt. No supplemental feed was provided and fish were harvested after 74 days of culture (9 June). 5587 fingerlings were harvested from the ponds and average survival was 3.8%. Mean fish length in one pond was 37±7 mm (23-54 mm) while mean size of fish in the other pond was 55±8 mm (38-80 mm). Incidence of pseudoalbinism was extremely low (<1%) in both ponds. The 78-day-old fish which were harvested from the ponds were converted to dry diets in 14 days. Average survival during the transition period was 80.4%.In contrast, fish harvested, during a previous pond nursery study, at an age of 220 days required 106 days for the transition to dry feeds, survival during transition averaging 58.2%.