虾夷马粪海胆的海区渡夏、室内中间培育及工厂化养成↑（*）

１９９３年７月～１９９７年５月，在夏季采用网袋、网箱开展虾夷马粪海胆Ｆ２代稚海胆的海区渡夏，壳径日平均生长量比室内提高３３．６％～６１．６％；采用网箱平面培育方法进行Ｆ２代稚海胆室内中间育成和Ｆ３代稚海胆室内中间育成中试，壳径的日平均生长量随时间呈下降趋势，为０．５３×１０－２～１．４６×１０－２ｃｍ／ｄ，体重日平均生长量呈上升趋势，介于２．３２×１０－２～１０．７２×１０－２ｇ／ｄ之间，培养中密度过大会降低海胆的成活率并导致疾病发生；采用立体水槽开展陆地工厂化养成，经１３个月，海胆壳径由１．１６ｃｍ增至５．９８ｃｍ，体重由０．４７ｇ增至６１．０ｇ，性腺指数达１８．０％。

Over-summering net cage cultivation at sea,medium culture and land pond culture of juvenile Strongylocentrotus intermedius

The over-summering cultivation at sea, indoor medium culture and land pond culture of juvenile of Strongylocentrotus intermedius transplanted from Japan were carried out from July 1993 to May 1997.The results showed that:(1) for F2 offspring cultivated by net cage,the daily growth rate in diameter in sea area is 33.6a.6% higher than that of the indoor when the water temperature is lower at sea than in indoor; (2) the daily growth rate in diameter for F2 medium indoor culture by net cage was from 0.3510-21.4610-2 cm/d,and varied with cultivation density and time.The daily growth rate in body weight increased with time from 2.3210-210.7210-2 g/d; (3) for largescale land pond culture,the diameter of sea urchin grew from 1.165.98 cm,and body weight from 0.4761.0 g within 13 months.The mean gonad index was 18.0%.