Larval production of blacktip grouper, Epinephelus fasciatus, initially fed with smaller rotifers filtered through a fine mesh net
2007
Kawabe, K.(Tokyo-to. Ogasawara Fisheries Research Center (Japan)) | Kimura, J.
We examined the technical feasibility of mass larval production of blacktip grouper, Epinephelus fasciatus, in small tanks three times between 1998 and 1999. Normally developing eggs collected from the spawning tank were stocked into 4 to 9 transparent 1-kl round tanks at a density of about 100,000 eggs per tank. Hatched larvae were fed on S-type rotifers, Artemia nauplii, and formula feed in progression with their growth. Rotifers were selected for size (150 microm) and fed at high density (30 individuals per ml of rearing water) from 3 to 7 days after hatching. The oil film that formed naturally on the water surface was removed frequently in an attempt to promote inflation of the swim bladder of the larvae, even though this protocol may induce the so-called 'floating death'. As a result, survival at 52 to 56 days after hatching was 0.7 % to 2.0% (671 - 2,000 individuals/kl), and 38.1% to 82.6% of the juveniles produced had a swim bladder. The overall survival rate was low, but the number of individuals produced per kl of rearing water was high and suitable for commercialization.
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