Can the length composition of krill in predator diets provide information on the age-dependence of krill natural mortality?
of krill is split between predator species. This method uses data on the length distribution of krill from ... predator stomachs. The proportions estimated depend, through the krill yield model, on the schedule ... of krill natural mortality at age. In principle, such a method would allow inferences about this schedule ... ., Butterworth, D.S. Title: Can the length composition of krill in predator diets provide information on the age ...
Meeting Document : WG-EMM-95/40 : Author(s): Thomson, R.B., Butterworth, D.S.
Operation results of Ukrainian vessels at Antarctic krill fishery in Subareas 48.2 and 48.3 in March-June 1994. Krill size composition
Abstract: In 1993 Ukraine has recommenced krill fishing which was terminated in 1993 ... of Ukrainian vessels at Antarctic krill fishery in Subareas 48.2 and 48.3 in March-June 1994. Krill size ... In 1993 Ukraine has recommenced krill fishing which was terminated in 1993. It is conducted by two ... Operation results of Ukrainian vessels at Antarctic krill fishery in Subareas 48.2 and 48.3 ...
Meeting Document : WG-Krill-94/33 : Author(s): V.A. Bibik and V.N. Yakovlev (Ukraine)
Some aspects of the relation between Antarctic krill abundance and CPUE measures in the Japanese krill fishery. (Component of SC-CAMLR-VI/BG/4)
Abstract: The history of the Japanese krill fishery is reviewed briefly. Important aspects ... quality considerations- in particular the increasing tendency to avoid catching "green” krill ... . These factors result in Catch-per-Day and Catch-per-Haul measures being unlikely to index krill abundance ... of indexing the extent of the krill distribution through routine oceanographic monitoring merits attention ...
Meeting Document : WS-KCPUE-89/03 : Author(s): D.S. Butterworth (South Africa)
Review of Russian investigations of krill escape through the meshes of commercial trawls: approaches to estimating gross removal at krill fishery
Abstract: In this study the review of Russian investigations of krill escapement through ... of fine-meshed chafers) and analytical methods are presented. The main factors affected on krill ... mortality» assessment in krill fishery. It is suggested to use the models of probability-statistical theory ... of the «escape mortality» process; obtaining standardized indices of krill mortality during one fishing operation ...
Meeting Document : WG-EMM-10/19 : Author(s): S.M. Kasatkina (Russia)
A model at the level of the foraging trip for the indirect effects of krill (Euphausia superba) fisheries on krill predators
on krill (Euphausia superba) predators, using the Adelie penguin (Pygoscelis adeliae) as a model organism ... . The model involves: (i) the description of the biomass and spatial distribution of krill; (ii) the effects ... of the fishery on the krill; (iii) the description of penguin breeding; and (iv) the indirect effects ... reproductive success and adult survival in the absence or presence of a fishery. The biomass of krill ...
Meeting Document : WG-EMM-98/48 : Author(s): M. Mangel and P.V. Switzer (USA)
Why does it necessary to consider krill flux for developing the feedback management strategy for krill fishery in the Area 48?
Abstract: The authors discussed the necessity to investigate krill flux for estimating the local ... . Estimates of krill flux factors in Subarea 48.3 based on the Soviet/Russian scientific observations from ... it necessary to consider krill flux for developing the feedback management strategy for krill fishery ... The authors discussed the necessity to investigate krill flux for estimating the local harvest ...
Meeting Document : WG-EMM-15/24 : Author(s): S. Kasatkina and V. Shnar (Russia)
Further computations of the consequences of setting the annual krill catch limit to a fixed fraction of the estimate of krill biomass from a survey
Abstract: The results of Butterworth et al. (1992) relating potential krill yield to a pre ... by the Third and Fourth Meetings of Working Group on Krill. The most important of these extensions ... , as specified by the Fourth Meeting, results in marked reductions in the probabilities of krill spawning biomass ... and S. Chalis (South Africa) Title: Further computations of the consequences of setting the annual krill catch ...
Meeting Document : WG-KRILL-93/42 : Author(s): D.S. Butterworth, G.R. Gluckman, R.B. Thomson and S. Chalis (South Africa)
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 ... 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 : Author(s): 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 ... on the inter-annual variation of krill biomass distribution between the major statistical subareas ...
Meeting Document : WG-EMM-09/47 : Author(s): V. Spiridonov (Russia)
Analysis of variability of krill size and fish by-catch in Japanese krill fishery based on scientific observer data
on 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 : Author(s): T. Okuda and M. Kiyota (Japan)