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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 ... 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 : Autor(es): Ashford, J., C. Jones, S. Bobko and I. Everson
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A hybrid approach to acoustic classification and length estimation of krill
considered. A euphausiid aggregation is represented by a three-dimensional probabilistic vector whose ... are derived by integrating the individual decisions. The size structure of the classified aggregation ... is derived from a fluid-sphere model. The effectiveness of the method is demonstrated by comparing ... euphausiid aggregation is represented by a three-dimensional probabilistic vector whose components are the ... component of a vector, using classical Bayesian techniques. Classifi cation probabilities are derived by ... uid-sphere model. The effectiveness of the method is demonstrated by comparing the acoustic estimates ... and consumed by whales. Therefore it is important to estimate the abundance and geographical distri ...
Science Journal Paper : CCAMLR Science, Volume 11 (CCAMLR Science, Volume 11) : 33–58 : Autor(es): Azzali, M., I. Leonori and G. Lanciani
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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 : Autor(es): Agnew, D.J. and C.A. Moreno
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Fishing for toothfish using pots: results of trials undertaken around South Georgia, March–May 2000
method successfully caught D. eleginoides, there was a large by-catch of crab species. The catch rate of ... eliminated bird by-catch. To capitalise on this feature, there is a need to improve the commercial viability ... of the method and minimise the quantity of by-catch. A number of potential changes are suggested to ... , there was a large by-catch of crab species. The catch rate of toothfish was notably lower than that ... achieved in the longline fishery. Importantly, the use of pots eliminated bird by- catch. To capitalise on ... ~~ant i ty of by-catch. A number of potential changes are suggested to this end. Resume De mars a ... made by CCAMLR's Working Group on Fish Stock Assessment (WG-FSA) in 1999 suggest that 210 seabirds ...
Science Journal Paper : CCAMLR Science, Volume 8 (CCAMLR Science, Volume 8) : 93–105 : Autor(es): Agnew, D.J., T.M. Daw, G.M. Pilling and M.G. Purves
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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 ... (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 ... and recruitment (Jones, 1992). By monitoring these through time, fi shery man- agers can detect ...
Science Journal Paper : CCAMLR Science, Volume 12 (CCAMLR Science, Volume 12) : 29–41 : Autor(es): Ashford, J., G. Duhamel, C. Jones and S. Bobko
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An integrated stock assessment for the Patagonian toothfish (Dissostichus eleginoides) for the Heard and McDonald Islands using CASAL
) abundance estimates by length bin, commercial catch-at-length data, standardised CPUE series for the trawl ... grounds, and tag releases and recoveries by length bin, is described. The annual surveys are spatially ... functions for each ground by gear (trawl and longline) combination. Various combinations of dataset ... data. A key uncertainty is the number of ages fully selected by the main survey series. With all the ... CASAL and data consisting of multi-year random stratified trawl survey (RSTS) abundance estimates by ... releases and recoveries by length bin, is described. The annual surveys are spatially representative of ... functions for each ground by gear (trawl and longline) combination. Various combinations of dataset ... tag data. A key uncertainty is the number of ages fully selected by the main survey series. With all ...
Science Journal Paper : CCAMLR Science, Volume 15 (CCAMLR Science, Volume 15) : 1–34 : Autor(es): Candy, S.G and A.J. Constable
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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 ... 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 ... Atlantic Ocean. Subarea 48.1 (459 thousand tonnes), the main The total catch obtained by the Soviet ...
Science Journal Paper : CCAMLR Science, Volume 5 (CCAMLR Science, Volume 5) : 51–62 : Autor(es): 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 : Autor(es): 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 : Autor(es): 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 : Autor(es): Marriott, P.M., M.J. Manning and P.L. Horn