| 报告题名: | Updating the Antarctic krill biomass estimates for CCAMLR Subareas 48.1 to 48.4 using available data |
| 作者: | Hill, Simeon; Atkinson, Angus; Darby, Chris; Fielding, Sofie; Krafft, Bjørn Arne; Godø, Olav Rune; Skaret, Georg; trathan, phil; Watkins, J
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| 出版者: | CCAMLR
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| 出版年: | 2015
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| 发表日期: | 2015
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| 国家: | 挪威
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| 语种: | 英语
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| 中文主题词: | 生物量
; 保护
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| 主题词: | BIOMASS
; CONSERVATION
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| 英文摘要: | We present a novel index of Antarctic krill biomass in CCAMLR subareas 48.1 to 48.4,
based on data from scientific nets and covering the years between 2000 and 2011. The annual biomass
variation was significant (CV=73%) but no systematic change in krill biomass was evident during the
period. The index also suggests that realised exploitation rates were below 0.5% (i.e. catch was <0.5%
of biomass) and that the potential exploitation rates implied by the operational catch limit (the trigger
level) were below 2% during this period. These exploitation rates are much lower than the
precautionary yield estimate for the krill fishery (which is 9.3%). Biomass indices from local scale
acoustic surveys also suggest that exploitation rates are low and that there is no evidence of a
systematic change in the krill stock. This evidence suggests that the trigger level is a highly
precautionary operational catch limit which is currently appropriate for achieving the conservation
criteria for the krill stock. It also suggests that the catch levels seen in the first decade of the 21st
century are unlikely to have adversely impacted the krill stock. Nonetheless the Commission also
needs to manage the risk of adverse impacts on dependent and related populations which might occur
if fishing is concentrated in sensitive areas. Advances are needed to improve management of krill
fisheries to manage these risks and to ensure that management is robust to the potential impacts of
climate change. We suggest that frequent assessment of the krill stock, at scales relevant to the
Commission’s conservation objectives, is a prerequisite for such advances. The most effective means
to achieve this is likely to be through increased use of fishing vessels to collect data, while
maintaining current time series |
| URL: | https://brage.bibsys.no/xmlui/bitstream/handle/11250/2398483/emm-15-28.pdf?sequence=3&isAllowed=y
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| 资源类型: | 研究报告
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/29159
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| Appears in Collections: | 过去全球变化的重建
影响、适应和脆弱性
科学计划与规划
气候变化与战略
全球变化的国际研究计划
气候减缓与适应
气候变化事实与影响
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| emm-15-28.pdf（1421KB） | 研究报告 | -- | 开放获取 | | View
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| Recommended Citation: | |
Hill, Simeon,Atkinson, Angus,Darby, Chris,et al. Updating the Antarctic krill biomass estimates for CCAMLR Subareas 48.1 to 48.4 using available data. 2015-01-01.
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