Improvement of larval survival rates by water agitation and medication in the seed production of snow crab Chionoecetes opilio
2007
Kogane, T.(National Center for Stock Enhancement, Obama, Fukui (Japan). Obama Station) | Hamasaki, K. | Dan, S.
Behavioral characteristics of snow crab Chionoecetes opilio larvae such as phototaxis and geotaxis in relation to their depth regulation were examined in the laboratory. Further, effects of agitation and bath treatment with sodium nifurstyrenate (NFS-Na) for larval rearing water on survival rates of larvae, rates of larvae which floated in the rearing water, and mortality rates of larvae which sunk to the bottom of the tank were investigated. The first stage zoeas floated in the upper layer of the rearing chamber showing positive phototaxis and negative geotaxis, however, almost all larvae of the later stages showed no reaction to a light stimulus and sunk to the bottom of the chamber. Larval floating rates and survival rates were improved by agitation and bath treatment with NFS-Na for rearing water; especially, survival rates significantly increased in the tanks with NFS-Na bath treatment.
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