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首页> 外文期刊>Journal of Fish Biology >Major changes in fecundity and the effect on population egg production for three species of north-west Atlantic flatfishe
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Major changes in fecundity and the effect on population egg production for three species of north-west Atlantic flatfishe

机译：三种西北大西洋比目鱼繁殖力的重大变化及其对种群产卵的影响

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Temporal and spatial variability in fecundity was investigated for three species of north-west Atlantic flatfishes: American plaice Hippoglossoides platessoides, yellowtail flounder Limanda ferruginea and witch flounder Glyptocephalus cynoglossus. Significant log sub(10) linear relationships existed between fecundity and total length (L sub(T)) for all three species and for all combinations of area (NAFO regulatory areas) and year. Fecundity differed between areas for yellowtail flounder and witch flounder and changed significantly for all three species since the last reported fecundity studies in the region 30-40 years ago. Three populations experienced decreases in fecundity (3LNO American plaice and yellowtail flounder, 3Ps witch flounder), one experienced an increase (3NO witch flounder) and one did not change (3L witch flounder). Significant yearly variability in fecundity at length and relative fecundity existed for all three species within the 6 year sampling period (1993-1998). Estimates of population egg production based on new and historic fecundity data revealed that using the old, invariant fecundity and L sub(T) relationship resulted in overestimation of total annual egg production by up to 24% for 3LNO American plaice and as high as 41% for 3LNO yellowtail flounder. These results clearly demonstrate the variable nature of fecundity for flatfishes in Newfoundland waters and suggest that the use of an invariant fecundity and L sub(T) relationship may result in inaccurate estimates of stock reproductive potential.
机译：调查了西北大西洋比目鱼三种繁殖力的繁殖力时空变化：美洲Hippoglossoides platesoides，黄尾比目鱼Limanda ferruginea和女巫比目鱼Glyptocephalus cynoglossus。对于所有三个物种以及所有区域组合（NAFO管制区域）和年份，繁殖力与总长度（L sub（T））之间存在显着的对数sub（10）线性关系。自从30-40年前该地区最近一次关于繁殖力的研究报告以来，黄尾比目鱼和巫婆比目鱼的繁殖力有所不同，并且这三种物种的繁殖力都发生了显着变化。 3个种群的繁殖力下降（3LNO美国和黄尾比目鱼，3Ps女巫比目鱼），一个种群增加（3NO女巫比目鱼），而一个不变（3L女巫比目鱼）。在6年的采样期内（1993年至1998年），所有三个物种的繁殖力和相对繁殖力均存在显着的年度变化。根据新的和历史的繁殖力数据估算的种群产蛋量表明，使用旧的不变的繁殖力和L sub（T）关系，美国3LNO产生的年总产蛋率高估了24％，而高估了41％ 3LNO黄尾比目鱼。这些结果清楚地表明了纽芬兰水域中比目鱼的繁殖力的可变性，并表明使用不变的繁殖力和L sub（T）关系可能导致种群繁殖潜力的估计不准确。

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