Résultats de la recherche
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Krill distribution in the western Atlantic sector of the Southern Ocean during 1983/84, 1984/85 and 1987/88 based on the results of Soviet mesoscale surveys conducted using an Isaacs-Kidd midwater trawl
Island. Surveys including from 158 to 202 stations were carried out by Soviet research vessels in the ... krill biomass distribution (g/1 000 m 3) and its mean values were analysed by subarea (Subareas 48.1 ... characterised by a change in biomass of more than two orders of magnitude in different seasons, was observed in ... in the island region during the 1983/84 season was caused exclusively by unfavourable oceanological ... Georgia Island. Surveys including from 158 to 202 stations were carried out by Soviet research vessels in ... m. Overall krill biomass distribution (g/ l 000 m3) and its mean values were analysed by subarea ... characterised by a change in biomass of more than two orders of magnitude in different seasons, was observed in ... krill in the island region during the 1983/84 season was caused exclusively by unfavourable ...
Science Journal Paper : CCAMLR Science, Volume 6 (CCAMLR Science, Volume 6) : 59–70 : Auteur(s): Sushin, V.A. and K.E. Shulgovsky
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Length-at-age in juvenile Patagonian toothfish (Dissostichus eleginoides)
density was distinctly polymodal, to see whether ages estimated by reading otoliths were congruent with ... the length modes observed. Length densities by age were compared graphically with the overall length ... observed in the length density represent different age cohorts separated by one year. File: 01ashford.pdf ... . No difference was found between predicted and estimated ages. We conclude that the two dominant modes ... pre-recruits, whose length density was distinctly polymodal, to see whether ages estimated by reading ... otoliths were congruent with the length modes observed. Length densities by age were compared ... cohorts separated by one year. Résumé À partir des otolithes d’un échantillon de pré-recrues de ... of Bedford’s (1983) method for scanning electron microscopy (SEM) use developed by Ashford et al ...
Science Journal Paper : CCAMLR Science, Volume 9 (CCAMLR Science, Volume 9) : 1–10 : Auteur(s): Ashford, J., C. Jones, S. Bobko and I. Everson
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The 1991/92 fishery for Dissostichus eleginoides in Subarea 48.3
November 1991 to 10 March 1992. A total of 3 382 tonnes was taken by one Bulgarian, five Russian and eight ... influenced by fishing depth, time of day or soak time, but was dependent on type of hook and geographical ... 0.2 in the Bulgarian. These differences were probably a result of the different hook types used by the ... tonnes was taken by one Bulgarian, five Russian and eight Chilean vessels. The maximum catch taken in a ... five-day period was 375 tonnes. Catch rate was not influenced by fishing depth, time of day or soak ... differences were probably a result of the different hook types used by the fleets. Resume En 1991/92, la ... when a total of 3 364 tonnes had been taken. A further 18 tonnes was taken by Bulgaria before it ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/9 (Selected Scientific Papers, SC-CAMLR-SSP/9) : 31–48 : Auteur(s): Agnew, D.J. and C.A. Moreno
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Age, growth and mortality of Patagonian toothfish (Dissostichus eleginoides) caught off Kerguelen
off Kerguelen in 1999 were estimated by reading transverse-sectioned otoliths. Randomly interspersed ... estimated to be –0.6 years and residual variance 2.9. Age distributions of toothfish caught by two vessels ... depth or season. Age–length keys were constructed for use in assessing toothfish catches made by ... sexes were found, estimating von Bertalanffy parameters for males to be L ∞ = 95.9, K = 0.12, t 0 = –4.6 ... for each vessel (Table 2). Longevity was found, as measured by the 99 percentile, to be 36 years for ... (Dissostichus eleginoides) caught off Kerguelen in 1999 were estimated by reading transverse-sectioned otoliths ... toothfi sh caught by two vessels showed discrepancies due to gear-specifi c catchability, or differences ... assessing toothfi sh catches made by trawlers and longliners at Kerguelen, and longevity was estimated to ...
Science Journal Paper : CCAMLR Science, Volume 12 (CCAMLR Science, Volume 12) : 29–41 : Auteur(s): Ashford, J., G. Duhamel, C. Jones and S. Bobko
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Distribution of the Soviet krill fishing fleet in the South Orkneys area (Subarea 48.2) during 1989/90
48.2) during 1989/90 Abstract / Description: The results of an analysis of haul-by-haul catch ... respectively), followed by a decrease to 6.9 and 7.1 tonnes/hour by May and June. The location of the fishing ... ground was observed to be stable, and it is considered that the location was determined by certain ... over oceanic areas, and targeted krill aggregations found in the major current flowing towards the ... locally, certainly some would be found and exploited by the fleet, since some vessels periodically make ... St. Kaliningrad 236000, Russia Abstract The results of an analysis of haul-by-haul catch ... /hour respectively), followed by a decrease to 6.9 and 7.1 tonnes/hour by May and June. The location of ... by certain hydrodynamic characteristics of the area, for example a complex current around the ...
Science Journal Paper : CCAMLR Science, Volume 5 (CCAMLR Science, Volume 5) : 51–62 : Auteur(s): Sushin, V.A
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Krill (Euphausia superba) distribution in relation to water movement and phytoplankton distribution off the northern South Shetland Islands
1990/91 a survey was conducted by RV Kaiyo Maru in the vicinity of the South Shetland Islands and ... concentration of krill and to estimate krill biomass in the area surveyed. Krill biomass estimation was done by ... means of hydroacoustics. Phytoplankton distribution was assessed by measuring surface concentrations of ... 54% lower than that observed in late January 1988. Information from studies of krill predators by US ... conducted by RV Kaiyo Maru in the vicinity of the South Shetland Islands and Elephant Island. The main ... estimate lain biomass in the area surveyed. Krin biomass estimation was done by means of hydroacoustics ... . Phytoplankton distribution was assessed by measuring surface concentrations of chlorophyll a. Water ... that observed in late January 1988. Information from studies of krill predators by US scientists also ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/8 (Selected Scientific Papers, SC-CAMLR-SSP/8) : 123–140 : Auteur(s): Ichii, T., H. Ishii and M. Naganobu
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Preliminary results of investigations of the Federal Republic of Germany on Notothenia rossii marmorata (Fischer, 1885) in January/February 1985
survey carried out by FRV " Walther Hervig " in January/February 1985 was used to collect ... around South Georgia and Elephant Island and the extent to which the measures adopted by CCAMLR to ... been low, N. rossii around South Georgia is still largely affected by the fishery. Stock size is ... carried out by FRV "Walther Hervig" in January/February 1985 was used to collect further basic: data ... Georgia and Elephant Island and the extent to which the measures adopted by CCAMLR to rebuild the stock ... . rossii around South Georgia is still largely affected by the fishery. Stock size is probably still less ... abundant) fish species around South Georgia: large near surface concentrations had already been noted by ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/2 (Selected Scientific Papers, SC-CAMLR-SSP/2) : 33-57 : Auteur(s): Kock, K.-H.
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Age estimation and maturity of the ridge-scaled macrourid (Macrourus whitsoni) from the Ross Sea
the Ross Sea Abstract / Description: Juveniles of the macrourid Macrourus whitsoni were collected by ... work on this species. Von Bertalanffy growth models assuming different growth by sex and by year-within ... of the macrourid Macrourus whitsoni were collected by the NIWA research vessel Tangaroa during the ... models assuming different growth by sex and by year-within-sex were fitted separately to a revised ... exclusively Macrourus whitsoni, comprised a substantial by-catch of the fishery, accounting for about 10% of ... been caught (Hanchet et al., 2004). Although a by-catch, this species is clearly of com- mercial ...
Science Journal Paper : CCAMLR Science, Volume 13 (CCAMLR Science, Volume 13) : 291–303 : Auteur(s): Marriott, P.M., M.J. Manning and P.L. Horn
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Catch-at-age analysis applied to new fisheries: the case of Dissostichus eleginoides
resource by coarse methods. The main aim of such surveys is to monitor fishing operations in order to ... a certain extent, limited by the complex fishing strategies of the operators and by the movements of ... possible to estimate the standing stock and potential yield of a resource by coarse methods. The main aim ... used in the statistical sampling theory. These procedures are, to a certain extent, limited by the ... complex fishing strategies of the operators and by the movements of fish stocks, which seriously affect ... stock of a resource and its potential yield utilising coarse methods similar to those proposed by ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/9 (Selected Scientific Papers, SC-CAMLR-SSP/9) : 3–9 : Auteur(s): Zuleta, A.V. and C.A. Moreno
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Mitigation of seabird captures during hauling in CCAMLR longline fisheries
hauling in CCAMLR longline fisheries. Haul captures were first recognised by CCAMLR as a problem as early ... exclusion devices (BEDs) placed around the hauling bay. Data collected by scientific observers since 2003 ... these two key functional characteristics into the specification of a BED to be deployed by longline ... captures were first recognised by CCAMLR as a problem as early as 1994/95 when steps were taken to reduce ... hauling bay. Data collected by scientific observers since 2003 suggest that there are two key aspects of ... into the specification of a BED to be deployed by longline vessels to reduce seabird captures during ... , dur- ing line setting has reduced the total number of dead seabirds in by-catch from over 5 000 in ...
Science Journal Paper : CCAMLR Science, Volume 17 (CCAMLR Science, Volume 17) : 155–162 : Auteur(s): Reid, E., B. Sullivan and J. Clark