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首页> 外文期刊>ICES Journal of Marine Science >Assessing the impact of fisheries-related mortality of harbour porpoise (Phocoena phocoena) caused by incidental bycatch in the dynamic Norwegian gillnet fisheries
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Assessing the impact of fisheries-related mortality of harbour porpoise (Phocoena phocoena) caused by incidental bycatch in the dynamic Norwegian gillnet fisheries

机译：在动态挪威吉利渔业中，评估港口Porpoise（Phocoena Phocoena）的渔业相关死亡率的影响

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摘要

Harbour porpoise (Phocoena phocoena) bycatch for Norwegian commercial gillnet fisheries from 2006 to 2018 was estimated using a traditional ratio estimator and generalized additive linear mixed models, with weight of fish landed and number of gillnet hauls as proxies for fishing effort. Estimates were derived from data collected with a contracted reference fleet of small coastal vessels and scaled up to the whole fleet using data from landing statistics. Bycatch estimates exhibited large yearly variations, ranging from 1151 to 6144 porpoises per year. Bycatch estimates in 4 of the last 5 years were significantly less than in the preceding 2 years. The best ratio-based and model-based yearly bycatch estimates were 1580 porpoises [coefficient of variation, (C.V.) 0.10, 95% confidence interval (CI) 1302-1902] and 1642 porpoises (C.V. 0.15, 95% CI 1165-2142), respectively. About 75% of bycaught porpoises were taken in the cod (Gadus morhua) and monkfish (Lophius piscatorius) fisheries, while the rest were taken in a variety of different gillnet fisheries. Our results suggest that bycatch of harbour porpoise in Norwegian gillnet fisheries has been unsustainable for several of the last 13years but are currently within international bycatch limits due to a recent reduction in monkfish fishing effort.
机译：港口Porpoise（Phocoena Phocoena）2006年至2018年挪威商业吉尔特纳渔业的兼途估计使用传统的比例估算器和广义添加剂线性混合模型，具有鱼类重量和捕捞努力代理的吉列搬运工数量。估计估计是从收集的数据收集的小沿海船只收集的数据，并使用着陆统计数据缩减到整个舰队。兼捕估计展出了大量变化，从1151到6144个Porpoises每年。过去5年中的4个拟分类估计明显低于前两年。基于比率和基于模型的年兼捕估计值为1580 porpoises [变异系数，（CV）0.10,95％置信区间（CI）1302-1902]和1642个裂孔（CV 0.15,95％CI 1165-2142） ， 分别。在COD（GADUS MORHUA）和MONKISH（Lophius Pishatorius）渔业中占据了大约75％的咒骂豚鼠，而其余的是各种不同的吉略渔业。我们的研究结果表明，在挪威吉利渔业的兼遗产港口渔业渔业对最近13年的几个人来说是不可持续的，但目前在国际兼捕限制范围内，由于蒙克斯鱼捕捞努力迅速减少。

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