Search results
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Estimation of krill (Euphausia superba) mortality and production rate in the Antarctic peninsula region
a rate of Z=0.88 (1989/90) and Z=0.96 (1987/88). Production was estimated and resulted a P/B ratio ... of 0.88 to 0.94 for different years. The exchange rate of water masses and krill biomass within one summer ... production) of 4.3 and 5.0*106 tonnes passing through the survey area during the respective summer. Author ... . Krill mortality was calculated by linearized catch curve analysis and resulted a rate of Z=0.88 (1989/90 ...
Meeting Document : WG-KRILL-91/15 : Author(s): Delegation of Germany
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UPDATE OF THE INTEGRATED STOCK ASSESSMENT FOR THE PATAGONIAN TOOTHFISH (DISSOSTICHUS ELEGINOIDES) FOR THE HEARD AND MCDONALD ISLANDS USING CATCH-AT-AGE DATA AND TWO YEARS OF SURVEY ABUNDANCE-AT-AGE DATA
combination of fishery and year had available at least 50 aged fish. For the trawl fisheries that were divided ... for each fishing period within that year. For years where insufficient fish were aged the catch-at-length ... fisheries were 15 and 20 yr, respectively. The results presented suggest that future ageing work would give ... AND TWO YEARS OF SURVEY ABUNDANCE-AT-AGE DATA Approval: Approved ...
Meeting Document : WG-SAM-09/09 : Author(s): S.G. Candy (Australia)
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Surface water masses, primary production, krill distribution and predator foraging in the vicinity of Elephant Island during the 1989-90 austral summer
was found to have a different age, sex and size distribution than that found in net samples, implying fine ... was found to have a different age, sex and size distribution than that found in net samples, implying fine ... of chinstrap penguins and over 80% of the diet of fur seals throughout the observation period. Fur seals ... , but at different distances (18-100 km for fur seals, 20-35 km for macaroni penguins, 11-24 km for chinstrap ...
Meeting Document : WG-CEMP-90/11 : Author(s): A.F. Amos, J.L. Bengtson, O. Holm-Hansen, V.J. Loeb, M.C. Macaulay and J.H. Wormuth (USA)
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Development of the Southern Ocean Continuous Plankton Recorder survey
the 1925–1927 Discovery Expedition, and has been used successfully for 70 years to monitor plankton ... in the North Sea and North Atlantic Ocean. Sixty-five years later the CPR as a Type II version returned ... south on 110°E in early December and north on 150°E in mid-March each year, and will serve ... the Australian data. Since 1991, over 90 tows have been made, providing over 36,000 nautical miles of records ...
Meeting Document : WS-BSO-07/P4 : Author(s): Hosie, G., M. Fukuchi and S. Kawaguchi
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Continuation of multi-Member research on the Dissostichus mawsoni exploratory fishery in East Antarctica (Divisions 58.4.1 and 58.4.2) from 2018/19 to 2021/22
and to allow more time for review by Working Groups of major reporting and review years in non-stock-assessment ... years. Compared to last year (WG-FSA-18/59), this research plan has been updated with 2019/20 operating ... . 2017, Eléaume et al. 2018). Here, we update the research plan for 2018/19 to 2021/22 (WG-FSA-18/59 ... ), in accordance with ANNEX 24-01/A, Format 2. This plan has been designed as a 4-year plan, based on the low risk ...
Meeting Document : WG-FSA-2019/44 : Author(s): Delegations of Australia, France, Japan, Republic of Korea and Spain
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Preliminary studies on age, growth and size at sexual maturity of Dissostichus eleginoides in the Ob-Lena Bank in the 2007/08 season
, but underestimate for > 30 years, as compared to AAD readers. This means that the present results on age, growth ... and comments. The estimated ages ranged from 5 to 48 years for males and from 4 to 48 years for females. Ten ... to fifteen years gave large contribution to the total age groups for both sexes. Females grew at a faster ... hand, the age at 50 % maturity for females and males was estimated to be 12.3 and 12.5 year ...
Meeting Document : WG-FSA-11/16 : Author(s): K. Taki, T. Iwami and M. Kiyota (Japan)
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Entanglement of Antarctic fur seals (Arctocephalus gazella) in man-made debris at Bird Island, South Georgia, during the 2004 winter and 2004/05 breeding season
by 64% from last year. For the first time since records started in 1990, none of the injuries were ... % compared to last year; the lowest number of entanglements recorded since 1989. As in previous years, most ... individuals observed entangled in debris were juveniles (80% of winter and 50% of summer observations ... ). Of the entanglements where the animal could be sexed, males made up the majority of both seasons. After the high ...
Meeting Document : SC-CAMLR-XXIV/BG/16 : Author(s): Delegation of the United Kingdom
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An index of per capita recruitment
)eM where R1 is the proportion of age-1 animals sampled in year y and M is the post-recruit mortality ... does not vary over age or between years; 2) 100% of age-1 animals spawn; 3) a representative sample ... is constant over all ages and years, and when all age-1 animals spawn. These conclusions are insensitive ... is the proportion of age-1 animals sampled in year y and M is the post-recruit mortality rate. The intent ...
Meeting Document : WG-EMM-99/50 : Author(s): R. Hewitt (USA)
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To the problem of assessment of probability of finding Antarctic krill concentrations in Division 58.4.2
and Cosmonauts Seas (30–80°E). At this the following main problems were addressed:- Systematization of krill ... Abstract: In 1994 the group of above mentioned authors has completed the first stage ... In 1994 the group of above mentioned authors has completed the first stage of researches ... for creation of an imitation model of krill distribution and search in the Cooperation and Cosmonauts Seas (30 ...
Meeting Document : WG-Krill-94/7 Rev. 1 : Author(s): V.N. Yakovlev, V.A. Bibik and L.M. Kokoz (Ukraine)
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Growth models for D. eleginoides for the Heard Island plateau region (Division 58.5.2) calibrated from otolith-based length at age data and validated using mark-recapture data
than 20 years the general trend in the data of length with age did not exhibit obvious asymptotic ... than 20 years the general trend in the data of length with age did not exhibit obvious asymptotic ... fixing the t0 and L? parameters of the VB model to give age zero length of 30 mm and asymptotic length ... model fitted by maximising the VP likelihood. For the 5 to 25 year age range predicted lengths from ...
Meeting Document : WG-FSA-05/64 Rev. 1 : Author(s): S.G. Candy, T. Lamb, A.J. Constable and R. Williams (Australia)