Résultats de la recherche

1. Analysis of trends in Japanese krill fishery CPUE data, and its possible use as a krill abundance index

   krill abundance index Abstract / Description:  Haul-by-haul logbook catch and effort data from the ... Japanese krill fishery for the 1980/81 to 2003/04 fishing seasons were analysed. For a number of ... . The results strongly suggest that the krill fishery in the South Georgia area is operating at a ... critical level of krill availability which is just enough to maintain the best factory performance. In this ... based on the data from Subarea 48.3. Similarly, there were no data from Subarea 48.3 outside the May ... similar analyses for the fl eets of other fi shing nations. At the moment there is no way of validating ... the Environment and Heritage Channel Highway, Kingston 7050 Tasmania, Australia Email – so.kawaguchi ... -ku Shizuoka, 424-8633 Japan Abstract Haul-by-haul logbook catch and effort data from the Japanese ...

   Science Journal Paper : CCAMLR Science, Volume 12 (CCAMLR Science, Volume 12) : 1–28 : Auteur(s): Kawaguchi, S., S. Candy, S. Nicol, K. Taki and M. Naganobu

2. Age and growth of Antarctic euphausiacea (crustacea) under natural conditions

   regressions. No difference in growth of krill was observed between the Antarctic Peninsula area and the ... Abstract / Description:  Five species of Antarctic euphausiid crustaceans were studied from the Antarctic ... Peninsula and the south-eastern Weddell Sea. Life spans range from two years for Euphausia frigida to six ... years for the krill Euphausia superba. Growth in length and weight was calculated by non-linear ... Five species of Antarctic euphausiid crustaceans were studied from the Antarctic Peninsula and the ... south-eastern Weddell Sea. Life spans range from two years for Euphausia frigida to six years for the ... krill Euthausia superba. Growth in length and weight was ca culated by non-linear regressions. No ... difference in growth of krill was observed between the Antarctic Peninsula area and the eastern Weddell Sea ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/4 (Selected Scientific Papers, SC-CAMLR-SSP/4) : 369-370 : Auteur(s): Siegel, V.

3. Statistical problems in krill stock hydroacoustic assessments

   -strength measurements. In the case of statistical methods, there are no clear guidelines for deciding what ... :  Two primary issues are at question for hydroacoustic assessments of krill. The first is the methods ... applied to establish biomass in a survey area and the second is the improvement in accuracy of target ... method is most appropriate, this is made even more difficult by the fact that most survey methods assume ... assessments of krill. The first is the methods applied to establish biomass in a survey area and the second ... is the improvement in accuracy of target-strength measurements. In the case of statistical methods ... , there are no clear guidelines for deciding what method is most appropriate, this is made even more ... difficult by the fact that most survey methods assume the population is fixed in space, relative to the ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I (Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I) : 301–309 : Auteur(s): Macaulay, M.C.

4. Distribution and population structure of Dissostichus eleginoides and D. mawsoni on BANZARE Bank (CCAMLR Division 58.4.3b), Indian Ocean.

   proportion to abundance, suggesting that no substantial recruitment takes place on BANZARE Bank and the ... BANZARE Bank (CCAMLR Division 58.4.3b), Indian Ocean. Abstract / Description:  The distribution, size ... investigated using biological data collected by a Japanese commercial fishing vessel during the austral summer ... shallower banks (<1 000 m), while D. mawsoni was caught on deeper slopes (>1 500 m). Separation of the ... commercial vessel, the FV Shinsei Maru No. 3, has been operating a longline explor- atory fishery for ... Toothfish are the largest nototheniid species in the Southern Ocean, with two species having a cir ... seamounts, between 50 and 60°S, and on the Patagonian Shelf and the southern coast of Chile to 30°S ... Gakuin University 2600 Aihara-cho, Machida Tokyo 194-0292, Japan Abstract The distribution, size ...

   Science Journal Paper : CCAMLR Science, Volume 18 (CCAMLR Science, Volume 18) : 145–153 : Auteur(s): Taki, K., M. Kiyota, T. Ichii and T. Iwami

5. A hybrid approach to acoustic classification and length estimation of krill

   / Description:  The problem of acoustically identifying and estimating the sizes of two euphausiid species is ... components are the mean ratios of the volume backscattering coefficients, measured at two different ... frequencies. The decisions on the species and the relative misclassification errors are calculated ... are derived by integrating the individual decisions. The size structure of the classified aggregation ... ). If there is no majority (situation (iii)), no decision is taken. Error probability of the Bayesian ... = 38. The correlation differs very signifi cantly from 0 (no correlation). The conversion factor ... estimates are derived from the absolute abundance of all size classes. A third shortcoming is that no ... , where no hauls were possible and the standard method had to rely only on visual estimation of ...

   Science Journal Paper : CCAMLR Science, Volume 11 (CCAMLR Science, Volume 11) : 33–58 : Auteur(s): Azzali, M., I. Leonori and G. Lanciani

6. An assessment of toothfish in Subarea 48.3 using CASAL

   paper presents an assessment of the stock of toothfish around South Georgia (Subarea 48.3) using the ... CASAL stock assessment software (Bull et al., 2005). Detailed attention is given to the incorporation of ... as much of the available tuning data as possible, as well as a whole range of assessment ... sensitivities – to fixed parametric assumptions, model structures and alternative data scenarios. Given the ... no other reason than that there is now no guarantee that the recruitment estimates provide a ... assumption that there was no process error in the second CPUE series, while still retain- ing a process ... are no clearly iden- tifiable cohorts moving through the survey data – nothing that would tally with ... pattern, with no strong or weak cohorts moving through the data – espe- cially not in the later years ...

   Science Journal Paper : CCAMLR Science, Volume 13 (CCAMLR Science, Volume 13) : 65–95 : Auteur(s): Hillary, R.M., G.P. Kirkwood and D.J. Agnew

7. Validation of sink rates of longlines measured using two different methods

   sight behind waves or in congregations of seabirds before the target depth was reached. No TDRs were ... of the ground line – IW-50 lines) were measured during commercial fishing operations using two ... = –0.181, P = 0.859). When the target depth was 15 m, sink rates measured using the bottle method (0.20 ... behind the vessel, i.e. out of the observer’s sight, when they reached the target depth. Bottles had a ... before the target depth was reached. No TDRs were lost during the trial. Bottle tests were most useful ... with 50 g.m–1 lead integrated into two strands of the ground line – IW-50 lines) were measured during ... difference was not statistically signifi cant (t12 = –0.181, P = 0.859). When the target depth was 15 m ... , sink rates measured using the bottle method (0.20 ± 0.02 m.s–1) were signifi cantly slower than those ...

   Science Journal Paper : CCAMLR Science, Volume 11 (CCAMLR Science, Volume 11) : 179–187 : Auteur(s): Wienecke, B. and G. Robertson

8. Feeding patterns of nine species of Antarctic fish and assessment of their daily food consumption

   food consumption Abstract / Description:  Little is known about the feeding patterns of non-commercial ... fish species in Antarctic waters. The aim of this study is to collect information on the feeding ... patterns of several commercially non-targeted species in the Indian Ocean sector of the Southern Ocean ... : Nototheniidae (four species), Channichthyidae (three species) and Bathydraconidae (two species). The study ... * * Abstract Little is known about the feeding patterns of non-commercial fish species in Antarctic waters ... . The aim of this study is to collect information on the feeding patterns of several commercially non ... -targetted species in the Indian Ocean sector of the Southern Ocean: Nototheniidae (four species ... ), Channichthyidae (three species) and Bathydraconidae (two species). The study concentrated on analysing the food ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/8 (Selected Scientific Papers, SC-CAMLR-SSP/8) : 321–333 : Auteur(s): Pakhomov, Y.A. and V.B. Tseitlin

9. Selectivity of standard Polish commercial trawl codends on Antarctic fishing grounds

   of 4.2 mm. The studies covered 6 major fish species. It appears from the study that Antarctic icefish ... and bumphead notothenia are subject to selection during trawling, although the effectiveness of this ... process- especially in the latter case- is not satisfactory. Scotia Sea icefish, Chaenodraco wilsoni, and ... Chionodraco rastrospinosus exhibit a lower tendency to pass through meshes of the codend than Antarctic ... Haberstroh (1987) expressed an opinion that the change of mesh shape from rhomboid to square has no special ... passed onto cover "no" to the sum of the same number of fish and the number of fish "nw" in the codend ... and having a length not greater than those in the cover, i.e. length L100, N = no. 100 no + nw ... weights of fish escaped and retained by the codend were exceptionally high, indicating that there were no ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/5 – Part II (Selected Scientific Papers, SC-CAMLR-SSP/5 – Part II) : 107-142 : Auteur(s): Zaucha, J.

10. Toothfish, Dissostichus eleginoides, at South Georgia

    Paper Title:  Toothfish, Dissostichus eleginoides, at South Georgia Abstract / Description:  The ... that the exploited fish are senescent and not contributing to the breeding population (CCAMLR-VIII ... , paragraph 106). Histological examination of the gonads of a small sample of fish taken from a commercial ... longliner in January 1990 indicates that the fish are sexually mature and, at the time of sampling, are ... longline fishery was justified (CCAMLR-VIII, paragraph 106). We know of no fishery anywhere in the World ... towards spawning condition. We see no reason to believe that the situation was any different during the ... SOUTH GEORGIA I. Everson and S. Campbell* Abstract The Dissostichus eleginoides fishery at South ... Georgia has expanded greatly in recent years. It has been claimed that the exploited fish are senescent ...

    Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 255–261 : Auteur(s): Everson, I. and S. Campbell

Pages