北海道南西沿岸における海藻給餌飼育がエゾバフンウニの成熟に及ぼす効果について

抄録

On the implications for mariculture, the effects of breeding with algal food supply to promote maturity of sea urchin, Strongylocentrotus intermedius (A. Agassiz) were examined from December 2000 to November 2001.Urchins were reared in tank under artificial condition with algal food supply as experimental urchins (EU). Maturity of the EU was compared with that of wild urchins (WU) to reveal the effects of algal food supply. Before spawning, the changes in gonad index (GI) and maturity stage of EU were similar to these of WU, which implied that the food supply breeding did not accelerate maturity of sea urchins. However, significant differences were observed in GI and maturity stage between experimental groups in spawning season. Satiation feeding of algae is considered to extend spawning period and slow gonad reduction for sea urchin S. intermedius.