大磷虾临产个体卵母细胞数量及组成特点研究

本文利用１９８９／１９９０至１９９２／１９９３年度南大洋考察于普里兹湾邻近海域所获大磷虾标本，分析了南极磷虾临产个体卵母细胞的数量及与体长、体重的关系，以及卵母细胞的组成和发育特点。结果表明：卵母细胞的数量（怀卵量）波动在２１８８－９２６３个之间，平均为５２８３个；连续４年的平均怀卵量没有显著差异；怀卵量与体重呈较好的正相关关系；与眼径及尾肢长度的相关关系较差；卵母细胞的组成可分为４个不同的发育期，各发育期数量的比例不尽然相同，似与卵巢发育程度和产卵时间有关。

NUMBER AND COMPOSITION OF OOCYTES IN GRAVID FEMALES OF ANTARCTIC KRILL, EUPHAUSIA SUPERBA DANA

Based on the samples collected from 4 austral summer sampling cruises from 1989/1990 to 1992/1993 in the Prydz Bay region,the Indian sector of the Southern Ocean,the number and development phase composition of ovarian oocytes in gravid females of Antarctic krill, Euphausia superba Dana,and the relations of the number of ovarian oocytes with body weight and body length were studied.The number of oocytes ranged from 2188 to 9263,with average of 5283.Year to year changes of the number of oocytes was not statistically significant.The relationship between the number of oocytes(OC) and body wet weight(WW,g) was OC=5172.1 WW-1121.6,R=0.856,that between OC and eye diameter(ED,mm)was OC=3799.1 ED-3175.6,R=0.431,and that between OC and uropod length(UL,mm) was OC=813.2UL-35.98,R=0.243.Four development phases of oocytes were found in gravid females,but their composition percentages varied with different samples which were collected in different times.It seemed that the complete maturity of almost all oocytes was an indication of egg laying.