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首页> 外文期刊>ICES Journal of Marine Science >Fecundity of the European lobster (Homarus gammarus) off southwestern Norway after stock enhancement: do cultured females produce as many eggs as wild females
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Fecundity of the European lobster (Homarus gammarus) off southwestern Norway after stock enhancement: do cultured females produce as many eggs as wild females

机译：种群增加后，挪威西南部欧洲龙虾的产卵情况：养殖雌性产卵的数量与野生雌性一样多

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摘要

An enhancement project with European lobster (Homarus gammarus) began in 1990, and over the following 5 years some 128 000 hatchery-produced juveniles of average age about 9 months were released around the islands of Kvitsey, southwestern Norway. Recaptures of reproductive female lobsters of cultured origin raised the question as to whether hatchery-reared females could perform as well as wild females in terms of egg production. A fecundity study therefore compared females of wild and cultured origin during autumn of 1996, and spring and autumn of 1997. No significant differences were found in size-specific fecundity (F = 0.0045 CL~(3.22); n — 215; r~2 = 0.88; CL is carapace length), weight of egg mass, embryonic development, or egg size (diameter or dry weight). Further, the number of eggs produced per female was in the same range as it was about 90 years ago, i.e. before the local stock collapsed. There were no indications of significant differences in fecundity between seasons and therefore no egg loss for the incubation period from October 1996 to the end of May 1997. The results suggest that more eggs are produced by the larger females than in lobsters elsewhere in Europe, but compare well with American lobsters (H. americanus) of the same size range and living in the same temperature regime (off Newfoundland).
机译：欧洲龙虾（Homarus gammarus）的增强项目始于1990年，在随后的5年中，挪威西南部的Kvitsey岛上约有128 000头孵化场生产的平均年龄约9个月的幼体被释放。重获具有养殖血统的繁殖雌性龙虾引发了一个问题，即孵化场饲养的雌性在产卵方面是否能和野生雌性一样好。因此，一项繁殖力研究比较了1996年秋季和1997年春季和秋季的野生和养殖雌性。在大小比繁殖力上没有发现显着差异（F = 0.0045 CL〜（3.22）; n — 215; r〜2 = 0.88； CL为甲壳长度），卵重，胚胎发育或卵大小（直径或干重）。此外，每只雌性产卵的数量与大约90年前相同，即本地种群崩溃之前。没有迹象表明不同季节之间的繁殖力存在显着差异，因此从1996年10月到1997年5月底的潜伏期没有卵损失。结果表明，雌性更大的卵比欧洲其他地方的龙虾产卵，但是与相同大小范围，生活在相同温度范围（纽芬兰附近）的美国龙虾（H. americanus）进行比较。

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