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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 ... sit upright in the water was recorded with the same watch as used for the TDRs. Analyses The sink ... 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 ...
Science Journal Paper : CCAMLR Science, Volume 11 (CCAMLR Science, Volume 11) : 179–187 : Autor(es): Wienecke, B. and G. Robertson
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A von Bertalanffy growth model for toothfish at Heard Island fitted to length-at-age data and compared to observed growth from mark–recapture studies
aged. Subsampling of random lengthfrequency (LF) data used to obtain the samples of fish for ageing ... used length-bin sampling involving a fixed sample size per bin. Estimation of the VB parameters used a ... definition of the likelihood function based on variable probability (VP) sampling due to the prespecified ... length-dependent selectivity function for trawl fishing and the additional effect of length-bin sampling ... that the term N/n no longer appears in p’. Note that for the LF data the Nj are observed totals for ... of L∞ calculated for each of the equations (A9) to (A12) given in Appendix 2, was no greater than ... sh that were aged. Subsampling of random length- frequency (LF) data used to obtain the samples of fi ... sh for ageing used length-bin sampling involving a fi xed sample size per bin. Estimation of the VB ...
Science Journal Paper : CCAMLR Science, Volume 14 (CCAMLR Science, Volume 14) : 43–66 : Autor(es): Candy, S.G., A.J. Constable, T. Lamb and R. Williams
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Scientific observations in CCAMLR fisheries – past, present and future
/ Description: CCAMLR has the primary competency for managing fishing south of the Antarctic Polar Front ... -independent studies are difficult and expensive to conduct. In addition, the size of the Convention Area, its ... remoteness and prevailing inclement weather further complicate matters. Therefore, in addition to the ... standard catch and effort data supplied by vessels, the collection of data by scientifically qualified ... reviewing the application of the scheme, CCAMLR is able to identify data which no longer need be collected ... , Australia Email – eugene@ccamlr.org Abstract CCAMLR has the primary competency for managing fi shing ... south of the Antarctic Polar Front. Despite a relatively long history of scientifi c research and fi ... addition, the size of the Convention Area, its remoteness and prevailing inclement weather further ...
Science Journal Paper : CCAMLR Science, Volume 12 (CCAMLR Science, Volume 12) : 81–98 : Autor(es): Sabourenkov, E.N. and E. Appleyard
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Distribution of mackerel icefish (Champsocephalus gunnari) (Channichthyidae) around South Georgia at various stages of its life cycle
South Georgia at various stages of its life cycle Abstract / Description: The distribution of mackerel ... into account the spatial–temporal variability of C. gunnari. Young fish of the first age group (<15 ... cm in length) were mainly found in the southern part of the study area, immature fish (15–25 cm) in ... the east and southwest, and adults (25–39 cm) in the north. The distribution of C. gunnari changes ... the shelf (Frolkina et al., 1998) (Table 1). In the Shag Rocks area no fi sh smaller than 12 cm ... , while in the Shag Rocks and Black Rocks areas no pre-spawning and spawning fi sh were observed. This ... concentrations were available over the entire shelf, fi sh aggregations were stable and no long migrations were ... were caught in the northeast area. There were no fi sh smaller or 59 Distribution of mackerel ...
Science Journal Paper : CCAMLR Science, Volume 9 (CCAMLR Science, Volume 9) : 49–69 : Autor(es): Frolkina, Zh.A
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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 : Autor(es): Kawaguchi, S., S. Candy, S. Nicol, K. Taki and M. Naganobu
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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 : Autor(es): Azzali, M., I. Leonori and G. Lanciani
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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 : Autor(es): Hillary, R.M., G.P. Kirkwood and D.J. Agnew
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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 : Autor(es): Everson, I. and S. Campbell
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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 : Autor(es): Pakhomov, Y.A. and V.B. Tseitlin
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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 : Autor(es): Zaucha, J.