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ANALYSIS OF VARIABILITY OF KRILL SIZE AND FISH BY-CATCH IN JAPANESE KRILL FISHERY BASED ON SCIENTIFIC OBSERVER DATA
Abstract: To investigate spatio-temporal variability of krill body length and number of bycatch ... fish, observer data sets on Japanese krill fishery from 1995 to 2008 were analyzed by using a ... dynamics from observation error caused by the fishery activity and individual observation. In both krill ... variability of krill population structure and a difficulty in predicting krill population dynamics. Variances ...
Meeting Document : WG-EMM-11/39 : Autor(es): T. Okuda and M. Kiyota (Japan)
KRILL CATCHES INDICATE THE IMPACT OF THE EL-NIŇO – SOUTHERN OSCILLATION RELATED PROCESSES ON THE DISTRIBUTION OF KRILL BIOMASS BETWEEN SUBAREAS OF THE ATLANTIC SECTOR OF ANTARCTIC
different climate oceanographic regimes and its influence on krill biomass into the discussion of krill ... fishery management issues. Krill catch data in Subareas 48.1, 48.2 and 48.3 are compared to the AMLR ... Programme findings as described by Loeb et al. (2009). It is shown that krill fisheries statistics may be ... inter-annual variation of krill biomass distribution between the major statistical subareas. The ...
Meeting Document : WG-EMM-09/47 : Autor(es): V. Spiridonov (Russia)
MaxEnt reconstructions of krill distribution and estimates of krill density from acoustic surveys at South Georgia 1996–2000
Abstract: We present Maximum Entropy (MaxEnt) reconstructions of krill distribution and estimates ... of mean krill density within two survey boxes of dimensions 80 km x 100 km to the north east and ... gathered in the boxes in austral summers 1996 – 2000. Krill densities had previously been determined at ... 1600 krill density estimates per box. The MaxEnt technique uses a Bayesian approach to infer the most ...
Meeting Document : WG-EMM-02/36 : Autor(es): M.H. Wafy, A.S. Brierley, S.F. Gull and J.L. Watkins (United Kingdom)
Abstract: The relationship between krill abundance and predator performance is fundamental to an ... ecosystem based approach to resource management. We propose a method using krill sampled from the diet of ... predators to provide a length-frequency distribution of krill at times when it is possible to run automated ... operations. This will allow a robust estimate of krill abundance to be estimated from acoustic data. Changes ...
Meeting Document : WG-EMM-00/42 : Autor(es): K. Reid and A.S. Brierley (United Kingdom)
The krill distribution in waters around the South Shetland Islands: Preliminary results from an acoustic survey conducted by a Chinese krill fishing vessel in December 2013
data for the estimation of krill stock and its management. In December 2013, a trial acoustic survey ... was conducted by the Chinese krill fishing vessel ‘FURONGHAI' in waters around the South Shetland ... Islands. Krill was found in most part of the survey area. The mean Sv of krill swarm tend to be higher in ... strait. The majority of the krill swarms were found in the upper 100 m with a thickness less than 30 m ...
Meeting Document : WG-EMM-14/47 : Autor(es): X. Wang, X. Zhao, G. Qi, T. Zuo, J. Zhu, J. Zhang and X. Li (People’s Republic of China)
Analysis of variability of krill size and fish by-catch in Japanese krill fishery based on scientific observer data
Antarctic krill commercial fishing vessels, we estimated the relationship between statistical precision and ... sample size by using variance component analysis. Observer datasets on Japanese krill fishery from 1995 ... biological process error in the population dynamics from fishery process as observation error. In both krill ... -temporal variability in size structure of krill population, which is presumably derived from large ...
Meeting Document : WG-EMM-12/68 : Autor(es): T. Okuda and M. Kiyota (Japan)
Krill distribution pattern due to water structure and dynamics near the South Sandwich Islands in January–February 2000 (Krill Synoptic Survey 2000)
krill distribution is carried out. There are determined three krill groups which differ each other by ... length frequency, maturity stages and waters inhabited. Distribution of the 1st krill group (juveniles 25 ... concentration of krill of the 3rd group (50-56 mm) transported there by ACC waters. Such concentrated schools ... are transported to South from East of archipelago, and may be mixed with krill of the 1st group. It is ...
Meeting Document : WG-EMM-00/33 : Autor(es): V. Sushin, P. Chernyshkov, V. Shnar, F. Litvinov and K. Shulgovskiy (Russia)
Modelling growth and reproduction of Antarctic krill: implications of spatial and temporal trends in temperature and food for ecosystem-based management of krill fisheries
Abstract: Errors in the growth model used in stock assessments of Antarctic krill, specifically ... higher rates of growth than occur in reality, could inadvertantly lead to over-exploitation of the krill ... population and cause impacts on krill predators. We review the three classes of models available for ... modelling krill growth – the von Bertalanffy class, the moult-cycle class based on measures of the duration ...
Meeting Document : WG-EMM-12/38 : Autor(es): A.J. Constable and S. Kawaguchi (Australia)
Abstract: Antarctic Krill, Euphausia superba, is the key species of the Southern Ocean ecosystem ... . Earlier analysis suggested decrease in krill abundance by 50% since the mid 1970’s to early 2000’s in the ... -ice coverage. More recent studies suggest more complex and/or dynamic nature of krill population ... trajectory as well as its link with decadal climatic events. Krill population dynamics is thought to be ...
Meeting Document : WG-EMM-18/07 : Autor(es): B. Meyer and S. Kawaguchi
Modelling Movement of Antarctic Krill (MMAK): the importance of retention, dispersal and behaviour for krill distribution
Abstract: Effective management of the Antarctic krill (Euphausia superba, hereafter krill ... ) fishery requires an understanding of the controls on the distribution and abundance of krill ... . Particularly important are the pathways and timescales of movement and retention affecting krill distribution ... the regional and local-scale processes that influence the distribution of krill in CCAMLR Area 48 ...
Meeting Document : WG-EMM-17/31 : Autor(es): S. Thorpe, E. Young and E. Murphy