Résultats de la recherche
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Estimating the impact of depredation by killer whales and sperm whales on longline fishing for toothfish (Dissostichus eleginoides) around South Georgia
the season in August. Killer whale interactions appear to be more consistent with no obvious pattern ... Paper Title: Estimating the impact of depredation by killer whales and sperm whales on longline ... data collected on longliners between 2003 and 2009 were analysed to look at the levels of depredation ... , and often appear to actively seek out fishing vessels and ‘strip’ the line of a large number of ... on observed sets which had no cetacean interactions, Cy,l is the declared catch in year y on ... sets having interactions of type l and sets having no cetacean interactions. The three interaction ... confirm the much higher impact of killer whales, with CPUE usually being reduced by 50%, but no ... with no general trend during the time period from 2003 to 2009 (Table 2). The large difference in ...
Science Journal Paper : CCAMLR Science, Volume 17 (CCAMLR Science, Volume 17) : 163–178 : Auteur(s): Moir Clark, J. and D.J. Agnew
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Vertical migrations of mackerel icefish (Champsocephalus gunnari) on the South Georgia shelf
had yielded almost no catches at all. The information obtained on vertical migrations of C. gunnari ... Paper Title: Vertical migrations of mackerel icefish (Champsocephalus gunnari) on the South ... Georgia shelf Abstract / Description: High values of coefficient of variation resulting from the ... calculation of mackerel icefish biomass (Champsocephalus gunnari) from trawl survey data on the South Georgia ... observed at night. Fishing during this period with bottom trawls had yielded almost no catches at all. The ... this period yielded almost no catches at all. The second peak from 11:00 to 16:00 hr was observed only ... (CHAMPSOCEPHALUS GUNNARI) ON THE SOUTH GEORGIA SHELF J.A. Frolkina and V .I. Shlibanov* * Abstract High ... values of coefficient of variation resulting from the calculation of mackerel icefish biomass ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/8 (Selected Scientific Papers, SC-CAMLR-SSP/8) : 3–14 : Auteur(s): Frolkina, J.A. and V.I. Shlibanov
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Effects of recruitment variability and natural mortality on generalised yield model projections and the CCAMLR decision rules for Antarctic krill
the annual size distributions of krill in penguin diets. Simulations with either no fishing, or with ... projections and the CCAMLR decision rules for Antarctic krill Abstract / Description: The generalised yield ... model (GYM) was used by CCAMLR to establish the precautionary catch limit for the Antarctic krill ... (Euphausia superba) fishery. The current precautionary catch limit was based on supplying the GYM with a ... studies and in the annual size distributions of krill in penguin diets. Simulations with either no ... all years of the recruitment vector in a single trial. Four values of gamma were modelled: no catch ... Island recruitment proportions with no additional CV on the recruitment vector and natural mortality ... from all four regions were all above the CCAMLR depletion decision rule at no catch, at the trigger ...
Science Journal Paper : CCAMLR Science, Volume 20 (CCAMLR Science, Volume 20) : 81–96 : Auteur(s): Kinzey, D., G. Watters and C.S. Reiss
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Movement, growth and available abundance to the fishery of Dissostichus eleginoides Smitt, 1898 at Heard Island, derived from tagging experiments
Paper Title: Movement, growth and available abundance to the fishery of Dissostichus eleginoides ... Patagonian toothfish (Dissostichus eleginoides) in different sectors of the Southern Ocean are considered to ... be genetically distinct. However, in the Indian Ocean, it is largely unknown whether stocks are ... separate between shelves and banks separated by deep water. More particularly, the separation of stocks on ... the same stock and there is no need to conduct separate assessments for each ground (Constable et al ... occur, but so far no such movement has been detected. All the fi shing grounds are located on the ... normally found on the grounds. No tagged fi sh have been recaptured in the French trawl fi shery near ... west of Heard Island respectively (Figure 1), or the Elan or BANZARE Banks to the south. No tagged ...
Science Journal Paper : CCAMLR Science, Volume 9 (CCAMLR Science, Volume 9) : 33–48 : Auteur(s): Williams, R., G.N. Tuck, A.J. Constable and T. Lamb
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Analysis and modelling of the Soviet Southern Ocean krill fleet
Paper Title: Analysis and modelling of the Soviet Southern Ocean krill fleet Abstract ... / Description: The first part of this document contains an analysis of data pertaining to the Soviet krill ... fleet. The data base consists of the records of 12 different cruises by 8 different research vessels ... between 1981 and 1984. The data are analyzed according to operational characteristics of the fishing ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I (Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I) : 127–235 : Auteur(s): Mangel, M.
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Methodological guidelines on the assessment of trawl catchability of krill by means of statistical modelling
Paper Title: Methodological guidelines on the assessment of trawl catchability of krill by means ... of statistical modelling Abstract / Description: This paper offers an approach to the assessment of ... the relative effectiveness of krill fishing gear by means of statistical modelling. The Monte-Carlo ... method, which is described in the works by Metropolis, N., Ulam, S. (1949) and Sobol, I.M. (1978), is ... . Metropolis, N., Ulam :S. The Monte Carlo method. J. Amer. Statist. Assoc., v. 44, No. 247, 1949, p. 335-341 ... THE ASSESSMENT OF TRAWL CATCHABILITY OF KRILL BY MEANS OF STATISTICAL MODELLING Z.I.Kizner (U. S ... . S. R.) Abstract This paper offers an approach to the assessment of the relative effectiveness ... of krill fishing gear by means of statistical modelling. The Monte-Carlo method, which is described ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/3 (Selected Scientific Papers, SC-CAMLR-SSP/3) : 195-222 : Auteur(s): Kizner, Z.I.
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Notothenia (P.) guntheri stock status and TAC estimation in the area of Shag Rocks (Subarea 48.3)
Paper Title: Notothenia (P.) guntheri stock status and TAC estimation in the area of Shag Rocks ... -1987/88 were used to analyse N. guntheri stock status. On the basis of these data using VPA method with ... , using F regression on fishing effort and using average weighted F. Prior to the beginning of fishery N ... . guntheri abundance was estimated as 227 thousand tonnes (using all the above mentioned methods). For 1986 ... TAC ESTIMATION IN THE AREA OF SHAG ROCKS (SUBAREA 48.3) K. Shust and R. Borodin Abstract Data ... . guntheri stock status. On the basis of these data using V P A method with different adjustments stock ... fishing effort and using average weighted F. Prior to the beginning of fishery N. guntheri abundance was ... estimated as 227 thousand tonnes (using all the abovementioned methods). For 1986/87 the figure was only ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/5 – Part II (Selected Scientific Papers, SC-CAMLR-SSP/5 – Part II) : 53-68 : Auteur(s): Shust, K. and R. Borodin
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Observations of fishing operations on a krill trawler and distributional behaviour of krill off Wilkes Land during the 1985/86 season
of krill off Wilkes Land during the 1985/86 season Abstract / Description: Japanese krill fishing ... operations were observed on board a commercial vessel and the actual operation described in detail. ‘Fish ... -finder’ was most useful in detecting swarms, while sonar was used to judge the towing direction. The size ... capture, whereas meal can be processed much later. The major products of Zuiyo Maru No. 2 were fresh ... . - 340 - Zuiyo Maru No. 2, in 1985/86, chose the ground off Wilkes Land, although she had to engage in ... another company that had already been operating there. Unfortunately there was no white krill by the ... Zuiyo Maru No. 2 in 1985/86 season was within the area of good harvesting in the past. During ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/4 (Selected Scientific Papers, SC-CAMLR-SSP/4) : 335-368 : Auteur(s): Ichii, T.
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Joint Polish/American hydroacoustic survey of Elephant Island and the vicinity of King George Island, 1988
Paper Title: Joint Polish/American hydroacoustic survey of Elephant Island and the vicinity of ... King George Island, 1988 Abstract / Description: The hydroacoustic survey found a low krill abundance ... in most areas covered by last year’s survey. The total biomass in the vicinity of Elephant Island was ... estimated from 120 kHz data to be 260k tonnes and that in the Bransfield Strait south of King George Island ... system (American) and the hull mounted system (Polish) in the RN Professor SiedJecki. There were no ... indications of interference between systems due to the operating frequencies having no common multiple (50 ... vessel track following the method described in BIOMASS Report Series No. 40. Mean volume back-scattering ... SURVEY OF ELEPHANT ISLAND AND THE VICINITY OF KING GEORGE ISLAND, 1988 M.C. Macaulay Abstract The ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I (Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I) : 357–377 : Auteur(s): Macaulay, M.C.
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Assessment and tag program adaption methods for exploratory fisheries in the CAMLR Convention Area: an example application for Division 58.4.3a
Paper Title: Assessment and tag program adaption methods for exploratory fisheries in the CAMLR ... Convention Area: an example application for Division 58.4.3a Abstract / Description: A methodology for the ... exploratory stocks in the CAMLR Convention Area. The assessment methodology is designed to be able to ... catch-at-length/age data and tagging data at-length/age. A simple algorithm, based upon the Petersen ... no direct age- structured information, apart from the intrinsic rate of increase parameter, r. This ... K an improper uniform prior is assumed – no information is added to the likelihood for all values ... be no recaptures to base an abundance esti- mate on). For an exploitation rate of one, the CV in ... (see Appendix 1). There are no CPUE data, and no estimate process error terms for the recap- ture ...
Science Journal Paper : CCAMLR Science, Volume 16 (CCAMLR Science, Volume 16) : 101–113 : Auteur(s): Hillary, R.M