大磷虾生殖力的研究

１９９２／１９９３南极夏季期间，在普里兹湾邻近海域捕获大磷虾临产雌体，于“极地”船上现场培养，观察其产卵次数、产卵量和产卵虾卵巢发育等生殖特点。对来自两个样本的５３条虾的实验结果表明，大部分虾仅产卵一次，产卵量为２２５～５９１９个，平均２１３２个，仅有两条虾于第一次产卵后的５和７天第二次产卵，第二次产卵量为５１６和４９２个。在产卵后的１～３９天内，已产个体的卵巢未见重新发育，卵巢内仅存少量成熟的卵母细胞（平均３２个），没有或极少有未成熟的卵母细胞。产卵量随体长的增加而增大，但相关水平一般。

LABORATORY STUDY ON THE FECUNDITY OF ANTARCTIC KRILL

The spawning habits including brood size,the number of broods,ovarian development of spawned females of 53 gravid females of Antarctic krill, Euphausia superba Dana,were investigated on board ship JiDi during the austral summer of 1992/1993 in the Prydz Bay region,the Indian sector of the Southern Ocean. Most of the females spawned only once. The brood size ranged from 225 to 5919 eggs with average of 2132. Only two females spawned secondly 5 and 7 days after the first spawning with brood size of 516 and 492 respectively. There were no or only a few (average of 32) mature oocytes remained in spawned ovaries. The regeneration of oocytes were not observed during 1-39 days after the spawning. The brood size increased with the increasing of body weight and body length, but the correlation were poor.