| 大磷虾性比、怀卵量与某些生殖特点的分析 |
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| 引用本文： | 王荣,陈时华.大磷虾性比、怀卵量与某些生殖特点的分析[J].极地研究,1989,1(3):61-68. |
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| 作者姓名： | 王荣 陈时华 |
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| 作者单位： | 中国科学院海洋研究所 青岛
(王荣)，国家海洋局第二研究所 杭州(陈时华) |
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| 摘 要： | 对1985年在南极半岛西北海域各拖网点获得的3852尾大磷虾标本,进行了性别、体长、体重、性成熟度和即将排卵的雌性成体怀卵量的测定。结果得出雌性个体占61.9％,雄性占38.1％;雄性比例在体长51-55毫米个体组中降为20.7％,大于55毫米个体组中仅占8.3％。雌性怀卵量在2457到10799个之间。同一虾群内已排卵的雌性成体比未排卵成体的体重小约1/3。乔治王岛东北海域的虾群在考察时(1月22日)已完成交配,并有2.3％的雌体已经排卵,大部分雌体到2月下旬才会排卵。布兰斯菲尔德海峡的大磷虾性成熟度较低。
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| 关 键 词： | 南极大磷虾 南大洋 怀卵量 生殖特点 |
SEX RATIO, FECUNDITY AND SOME REPRODUCTION CHARACTERISTICS OF KRILL (EUPHAUSIA SUPERBA DANA) IN THE WATER NORTHWEST OF ANTARCTIC PENINSULA |
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| Wang Rong.SEX RATIO, FECUNDITY AND SOME REPRODUCTION CHARACTERISTICS OF KRILL (EUPHAUSIA SUPERBA DANA) IN THE WATER NORTHWEST OF ANTARCTIC PENINSULA[J].Chinese Journal of Polar Research,1989,1(3):61-68. |
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| Authors: | Wang Rong |
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| Abstract: | During the First Chinese Antarctic Expedition extensive IKMT (Isaacs- Kidd midwat-er trawl) tows were made. The body length, weight, sex and sexual maturity of Euphausia superba in the samples were determined. And the fecundity of 65 gravid females were measured.
Among 3640 individuals, the sex of which can be determined, only 38.1% are males. Evidence shows that the larger the body length, the smaller the percehtagp of male is. In group of 51-55 mm body length the male decreases to 20.7%. In group larger than 55mm the male drops to 8.3%. This is probably due to die off of male after pairing or due to changes in behavior.
The fecundity of gravid female ranges from 2457 to 10799. The relation between body weight (W) and fecundity (F) is as follows:
F=4890×W-190(r=0.9178) The weight of ovary is about 42.14% (s.d. = 6.96%) of the body weight. The average body weight of spent female (3EF) is olny 65.6% of that of gravid female. The loss of weight after spawning is as big as 34.4%.
There is a great variation in sexual maturity from place to place. In water north of South Shetland Islands only adults were found in swarms. Gravid female account for 20.2%, spent female 3.4%. In the eastern mouth of Bransfield Strait, owing to the influence of Weddell drift the sexual maturity is much lower than other parts observed. No gravid and spent female were found. The sub-adults were dominant in the swarms. |
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| Keywords: | Antarctic krill Southern Qccan Kcproduction Bccuncity |
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