Search results
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Quantifying the escape mortality of trawl caught Antarctic krill (Euphausia superba)
commonly used commercial trawl mesh sizes. A vital component of the overall management of a fishery is to ... fishing gear. The methods for determining fishing mortality in krill are still poorly developed. We used a ... 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 ...
Meeting Document : WG-EMM-16/04 : Author(s): B.A. Krafft, L.A. Krag, A. Engås, S. Nordrum, I. Bruheim and B. Herrmann
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Biomass results from the International Synoptic Krill Survey in Area 48, 2019
a standing stock estimate of 72 mt with a sampling CV of 13%. For the AMLR strata the density was ... 64.2 gm-2, standing stock 8 mt, and a CV of 16%. However, the choice of krill length distributions used ... to convert acoustic backscatter into krill density has a significant effect on these estimates and ... . Fielding, S. Choi, S. Chung, K. Demianenko, V. Podhornyi, K. Vishnyakova, L. Pshenichnov, A. Chuklin, A ...
Meeting Document : SG-ASAM-2019/08 Rev. 1 : Author(s): G. Macaulay, G. Skaret, T. Knutsen, O.A. Bergstad, B. Krafft, S. Fielding, S. Choi, S. Chung, K. Demianenko, V. Podhornyi, K. Vishnyakova, L. Pshenichnov, A. Chuklin, A. Shishman, X. Wang, X. Zhao and M. Cox
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Modelling egg and larval transport of Antarctic toothfish (Dissostichus mawsoni) in the East Antarctic region: preliminary result using satellite data
Abstract: Using two different surface geostrophic filed data (A-1: without and A-2: with temporal ... observed in the experiment A-1, the majority of particles were advected eastward in the experiment A-2. A ... experiment A-2 because of effects of temporal eddy activities. In the northern continental slope region, most ...
Meeting Document : WG-FSA-2019/63 : Author(s): M. Mori, K. Mizobata, T. Okuda and T. Ichii
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Does the current South Georgia groundfish survey accurately estimate the standing stock of mackerel icefish?
Abstract: In subarea 48.3 mackerel icefish (Champsocephalus gunnari) are currently assessed by a ... bottom trawl survey, but evidence from predators and acoustics indicates that a considerable portion of ... the icefish biomass is in midwater and therefore missed by the bottom trawl survey. In January 2004, a ... midwater and reinforced the evidence that a bottom trawl survey significantly underestimates biomass. An ...
Meeting Document : WG-FSA-SAM-04/20 : Author(s): Agnew, D., Goss, C., Xavier, J., Belchier, M., Collins, M., Reid, K.
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Technical note on the sampling procedures of the Saga Sea
that a Norwegian-flagged vessel, “Saga Sea” would be fishing for krill in the 2005/06 fishing season ... considered a ‘new and exploratory fishery’ if a monitoring system was implemented that provided adequate ... response to these concerns a monitoring system has been developed in collaboration between Norway’s ... onboard by a UK CCAMLR Scientific and National Observers. Author(s): J. Hooper (United Kingdom), T ...
Meeting Document : WG-EMM-06/18 : Author(s): J. Hooper (United Kingdom), T. Knutsen (Norway), D. Agnew (United Kingdom) and S.A. Iversen (Norway)
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Assessment of toothfish in Subarea 48.3, 2006
Abstract: 1. As requested by SAM-2006, we provide a reference assessment for toothfish in Subarea ... data. We additionally provide a sensitivity run which examines uncertainty in IUU catches from 1995, as ... requested by the Joint Assessment Group. 2. Also as requested by SAM-2006, we provide a review of CPUE ... trends and construct a model that uses age-based observations, specifically estimates of catches at age ...
Meeting Document : WG-FSA-06/53 : Author(s): D.J. Agnew, R. Hillary, M. Belchier, J. Clark and J. Pearce (United Kingdom)
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Assessment of the Dissostichus eleginoides stock in Subarea 48.3 for the 1990/91 season and calculation of TAC for the 1991/92 season
optimal results, fishing operations should be conducted at a level of F0.1. In accordance with such a ... policy, a TAC of 8.8 thousand tonnes is proposed for the 1991/92 season. A sensitivity analysis ... demonstrated that the stock size and TAC were determined with a high degree of robustness Author(s): P.S ...
Meeting Document : WG-FSA-91/24 : Author(s): P.S. Gasiukov, R.S. Dorovskikh and K.V. Shust (USSR)
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MODELING PREDATION BY TRANSIENT LEOPARD SEALS FOR AN ECOSYSTEM-BASED MANAGEMENT OF SOUTHERN OCEAN FISHERIES
leopard seals on a community of mesopredators (seals and penguins) and their prey at South Georgia, and ... Antarctic krill and icefish, which are targeted by regional fisheries. We used a state-space formulation to ... combine (1) a mark-recapture open-population model and individual identification data to assess seasonally ... variable leopard seal arrival and departure dates, numbers, and residency times; (2) a size-based ...
Meeting Document : WG-EMM-09/P08 : Author(s): J. Forcada, D. Malone, J.A. Royle and I.J. Staniland
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DEVELOPMENT OF SPATIALLY EXPLICIT AGE-STRUCTURED POPULATION DYNAMICS OPERATING MODELS FOR ANTARCTIC TOOTHFISH IN THE ROSS SEA
operating models for Antarctic toothfish in the Ross Sea. The operating models consider both a coarse-scale ... program allows implementation of an aggregate movement model for use with large numbers of areas as a ... discrete time-step state-space model that represents a cohort-based population age structure in a spatially ... mortality), as well as movement processes defined as the product of a set of preference functions that are ...
Meeting Document : WG-SAM-09/18 : Author(s): A. Dunn, S. Rasmussen and S. Hanchet (New Zealand)
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Further development of coarse- and medium-scale spatially explicit population dynamics operating models for Antarctic toothfish in the Ross Sea region
these models are an improvement on earlier versions, further work is required to improve these residual ... these models are an improvement on earlier versions, further work is required to improve these residual ...
Meeting Document : WG-FSA-12/44 : Author(s): S. Mormede, A. Dunn, S. Parker and S. Hanchet (New Zealand)