白俄罗斯水体中窄爪小龙虾的繁殖力

A. Alekhnovich
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摘要

对白俄罗斯湖泊和水库中窄爪小龙虾种群的幼虫孵化前繁殖力和卵巢繁殖力进行了测定。不同水体雌鱼的繁殖力有统计学上的显著差异,只有基奇诺湖有统计学上的差异。对于所有其他水体,繁殖力对雌性长度的依赖没有统计学差异,并由一个方程描述。在产卵期(产卵期)、授精期和与雌性多足体的附着期,卵损失最大。在短时间内(2 ~ 3小时),120 mm TL雌虫的卵死亡率为30%,小雌虫死亡率降低,大雌虫死亡率升高。在怀孕期间,卵子死亡率平均为8%。
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Fecundity of the narrow-clawed crayfish Pontastacus leptodactylus in the water bodies of Belarus
Pre-larvae hatching fecundity and ovarian fecundity of narrow-clawed crayfish populations were estimated in the lakes and reservoirs of Belarus. Statistically significant differences in the fecundity of females from various water bodies were noted only for Lake Kichino. For all other water bodies, the fecundity dependence on the length of females did not differ statistically and was described by one equation. The greatest loss of eggs was noted during the spawning period (oviposition), insemination and attachment to pleopods of the female. During this short period (2–3 hours), egg mortality of females 120 mm TL is 30 %, it decreases for small females and increases for large ones. During the gestation period, egg mortality averages 8 %. 
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