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globalchange > 过去全球变化的重建

DOI:	10.1371/journal.pone.0162311
论文题名:	Quantifying the Escape Mortality of Trawl Caught Antarctic Krill (Euphausia superba)
作者:	Bjørn A. Krafft; Ludvig A. Krag; Arill Engås; Sigve Nordrum; Inge Bruheim; Bent Herrmann
刊名:	PLOS ONE
ISSN:	1932-6203
出版年:	2016
发表日期:	2016-9-13
卷:	11, 期:9
语种:	英语
英文关键词:	Death rates ; Fish physiology ; Salinity ; Fisheries science ; Oxygen ; Sea water ; Curve fitting ; Surface temperature
英文摘要:	Antarctic krill (Euphausia superba) is an abundant fishery resource, the harvest levels of which are expected to increase. However, many of the length classes of krill can escape through commonly used commercial trawl mesh sizes. A vital component of the overall management of a fishery is to estimate the total fishing mortality and quantify the mortality rate of individuals that escape from fishing gear. The methods for determining fishing mortality in krill are still poorly developed. We used a covered codend sampling technique followed by onboard observations made in holding tanks to monitor mortality rates of escaped krill. Haul duration, hydrological conditions, maximum fishing depth and catch composition all had no significant effect on mortality of krill escaping 16 mm mesh size nets, nor was any further mortality associated with the holding tank conditions. A non- parametric Kaplan-Meier analysis was used to model the relationship between mortality rates of escapees and time. There was a weak tendency, though not significant, for smaller individuals to suffer higher mortality than larger individuals. The mortality of krill escaping the trawl nets in our study was 4.4 ± 4.4%, suggesting that krill are fairly tolerant of the capture-and-escape process in trawls.
URL:	http://journals.plos.org/plosone/article/file?id=10.1371/journal.pone.0162311&type=printable
Citation statistics:
资源类型:	期刊论文
标识符:	http://119.78.100.158/handle/2HF3EXSE/25291
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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journal.pone.0162311.PDF（4889KB）	期刊论文	作者接受稿	开放获取	CC BY-NC-SA	View Download

作者单位:

Institute of Marine Research, Bergen, Norway;DTU Aqua, Technical University of Denmark, Hirtshals, Denmark;Institute of Marine Research, Bergen, Norway;Aker BioMarine AS, Oslo, Norway;Rimfrost AS, Fosnavåg, Norway;SINTEF Fisheries and Aquaculture, Fishing Gear Technology, Hirtshals, Denmark

Recommended Citation:

Bjørn A. Krafft,Ludvig A. Krag,Arill Engås,et al. Quantifying the Escape Mortality of Trawl Caught Antarctic Krill (Euphausia superba)[J]. PLOS ONE,2016-01-01,11(9)

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