Sampling Krill

and, Jon Watkins; Macaulay, Michael C.

doi:10.1002/9780470999493.ch2

Cited by 12 publications

(3 citation statements)

References 51 publications

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“…We have included both targeted and non-targeted hauls for analysis of length frequency distribution, following the recommendation 34 that the priority is to sample a sufficient number of krill to be representative of the wider population, which can require combining targeted and non-targeted hauls where necessary. However to test whether this may have caused a bias in the time trends we divided the hauls into those that provided a representative sample of the whole top 100m layer and the remainder (including targeted hauls).…”

Section: Transformation and Screening Of Datamentioning

confidence: 99%

Krill (Euphausia superba) distribution contracts southward during rapid regional warming

et al. 2019

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Section: Transformation and Screening Of Datamentioning

confidence: 99%

Krill (Euphausia superba) distribution contracts southward during rapid regional warming

et al. 2019

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“…The distribution of krill is circumpolar, and South Georgia, Bird Island, South Orkney Island, Elephant Island, the Bransfield Strait and the Ross Sea have higher biomass than other areas of Antarctica (Hofmann and Hüsrevoglu, 2003;Siegel, 2005;Atkinson et al, 2009). Krill often congregate in different forms (path, shoal, swarm, and school) on the edge of the continental shelf, near sea ice and around islands and exhibit diurnal vertical movement behavior (Watkins et al, 2000). Krill have obvious vertical movement behavior in the day and night, inhabiting deep water at depths of 200-500 m in the daytime and rising to the surface or upper 0-200 m at night.…”

Section: Antarctic Krill Distribution and Historymentioning

confidence: 99%

An Integrated, Size-Structured Stock Assessment of Antarctic Krill, Euphausia superba

Wang

Song

et al. 2021

Front. Mar. Sci.

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The Antarctic krill (Euphausia superba) fishery is the largest fishery in the Southern Ocean, and it has been operating for over 45 years. In the past decade, the spatial distribution of the krill fishery has focused on the Bransfield Strait off the Antarctic Peninsula (subarea 48.1). However, the high fishing effort and climate change have placed great pressure on krill resources in this region, and conservation concerns have been raised. Because aging krill is difficult and uncertain, we developed an integrated size-structured model to estimate the fishing mortality, recruitment and spawning biomass of krill. The results indicated that in 1992–2011, the average spawning biomass of krill ranged from 1.14 × 106 to 1.45 × 106 tons, the estimated biomass of the maximum sustainable yield (BMSY) ranged from 3.96 × 105 to 4.90 × 105 tons and the estimated average recruitment ranged from 2.3 × 1012 to 5.03 × 1012 individuals in the research area. We explored the effect of different data weighting schemes for the length data on the assessment output. However, our estimates also have uncertainties. In addition, an attempt was made to analyze the correlation between model-estimated recruitment and mature biomass with climate change. Future stock assessments of krill resources should be comprehensive and multimethod, and the management of krill resources should be based on science that considers the demand of fishing communities and ecosystem protection.

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Section: Antarctic Krill Distribution and Historymentioning

confidence: 99%

Data_Sheet_1.docx

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Sampling Krill

Cited by 12 publications

References 51 publications

Krill (Euphausia superba) distribution contracts southward during rapid regional warming

Krill (Euphausia superba) distribution contracts southward during rapid regional warming

An Integrated, Size-Structured Stock Assessment of Antarctic Krill, Euphausia superba

Data_Sheet_1.docx

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