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21.
中西太平洋金枪鱼围网技术及存在的问题 总被引:3,自引:0,他引:3
金枪鱼围网产量约占全球金枪鱼捕获量的70%,发展金枪鱼围网渔业具有广阔的前景.本文根据中鲁远洋渔业股份有限公司金枪鱼围网渔船的作业情况,分析了围网作业中的一些捕捞技术,并探讨了在发展该项目中存在的问题. 相似文献
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Warren B. White Kathryn A. Gloersen Francis Marsac Yves M. Tourre 《Journal of Oceanography》2004,60(3):531-541
Interannual coupled Rossby waves in the extratropical Indian Ocean propagate westward in covarying pycnocline depth, sea surface
temperature, and meridional surface wind anomalies from the west coast of Australia between 15°S and 35°S, taking 3–4 years
to transit the interior ocean to Madagascar. In the interior subtropical gyre, where the tuna longline catch (TLC) mainly
concerns two species (albacore and bigeye), these waves have been observed to affect year-to-year changes in catch, with wave
crests (troughs) in the main pycnocline associated with high (low) TLC anomalies. This suggested that tuna longline catch
is associated with the entrainment of nutrient-rich pycnocline water into the photic zone and a subsequent increase in primary
productivity there. Here, this hypothesis is examined within the context of SeaWiFS chlorophyll concentration (CC). We find
the situation the opposite of that expected, with wave crests (troughs) in the main pycnocline associated with low (high)
CC anomalies averaged over the photic zone. These results are shown to be consistent with a model relating the anomalous CC
tendency to upper-layer divergence in the wave, not unlike that relating surface slicks to upper-layer divergence in internal
gravity waves. Thus, the connection between interannual coupled Rossby waves and TLC in the interior subtropical gyre does
not appear to derive from wave-induced modulation of the pelagic food web.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
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两种结构延绳钓渔具使用效果的比较研究--以金枪鱼(Thunnus)为例 总被引:3,自引:1,他引:2
分析比较两种不同结构的延绳钓渔具 1998年 2~ 9月期间在印度洋东部作业的生产效果。结果显示 ,钓具 A(平均放钓水深 90 .8m)与钓具 B(平均放钓水深 72 .7m)相比 ,钓捕效果差异显著 ,在渔获尾数、渔获重量、上钓率三个指标上 ,A钓具分别高于后者 2 9.52 %、30 .2 1%和9.80 %。提出了符合印度洋生产需要的钓具优化设计方案。 相似文献
27.
《Marine Policy》2014
In recent decades there has been steady progress towards a risk-based management approach for fisheries. An important first step in a risk analysis framework is scoping to identify, describe and catalog the sources of uncertainty that might have an impact on a fishery. This paper introduces a methodology based on a range of tools to formalize the process of elicitation of uncertainties, from both experts and stakeholders, for the International Commission for the Conservation of Atlantic Tunas (ICCAT). ICCAT is a regional fisheries management organization responsible for the conservation of tunas and other highly migratory fish in the Atlantic Ocean and its adjacent seas. The aim of the elicitation was to identify and prioritize uncertainties for inclusion in Operating Models for Management Strategy Evaluation (MSE). The tool presented in this paper supports the qualitative prioritization of uncertainties, while also visualizing the degree of consensus among stakeholders on particular issues. Perceptions of uncertainty in fisheries often vary widely among scientists, industry and other interest groups, so tools that can facilitate inclusion and representation of different opinions are useful where decision-making depends on broad agreement and more generally, where effective management depends on commitment from stakeholders. 相似文献
28.
Cheng Zhou Yuanyuan Hu Jie Cao Liuxiong Xu Xuefang Wang Rong Wan Yu Xiao Jiangfeng Zhu Hao Tang 《海洋学报(英文版)》2022,41(3):1-2
In the western and central Pacific Ocean, upper strata waters exhibit highly dynamic oceanographic features under ENSO variability. This has been proved to be responsible for the dynamic change of both abundance and zonal distribution of skipjack tuna(Katsuwonus pelamis). Although causality has been suggested by researchers using physical–biological interaction models, cumulative evidence needs to be obtained and the tenability of assertion needs to be tested from an ecological habitat perspecti... 相似文献
29.
Quentin Hanich 《Marine Policy》2012,36(2):327-332
The Western and Central Pacific Ocean is home to the world's most productive tuna fisheries, with the majority of tuna catches occurring inside the exclusive economic zones (EEZs) of the region's developing coastal States. It is important that these fisheries are managed effectively throughout their range, both within and between EEZs and on the high seas. Unrestrained exploitation in a particular EEZ or on the high seas has the potential to significantly impact on catches elsewhere with potentially devastating consequences for developing coastal States, some of which have few alternate resources. The Western and Central Pacific Fisheries Commission (WCPFC) was established in 2004 to manage the region's highly migratory tuna fisheries. However, the WCPFC has since repeatedly failed to adopt conservation and management measures that are sufficient to meet the WCPFC's conservation and sustainable use objectives. This paper analyses catch data from the WCPFC and suggests that the weak position of bigeye (in a strategic political context), the unwillingness of members to compromise their interests and the lack of a transparent framework for distributing the burden of conservation are key factors in the WCPFC's failure to adopt sufficiently strong conservation and management measures. 相似文献
30.
2010年7月利用灯光罩网和延绳钓对南沙北部海域进行了初步的渔业资源调查,报道了该海域的鸢乌贼(Symplectoteuthis oualaniensis)和金枪鱼的渔获与分布状况。灯光罩网平均CPUE 63.90 kg/网,主要渔获物为鸢乌贼,占总产量的67.57%,平均胴长122 mm,质量89.6 g;延绳钓平均CPUE为18.19 kg/百钩,其中大目金枪鱼(Thunnus obesus)3.24 kg/百钩、短鳍斜齿鲨(Scoliodon Palasorrah)10.46 kg/百钩,渔获尾数较多的为帆蜥鱼(Alepisaurus ferox)和黑魟(Dasyatis atratus),分别占总数的39.13%和26.09%。提出南沙金枪鱼捕捞采用延绳钓与灯光罩网联合方式的建议。 相似文献