Résultats de la recherche

1. Estimating fishing gear selectivity for Patagonian toothfish (Dissostichus eleginoides) caught by trawlers on the Heard Island plateau region (Division 58.5.2) using trawl and longline length frequency data and forward-calculated continuation ratios

   (Dissostichus eleginoides) on the Heard Island Plateau (Division 58.5.2) was modelled as a 3-segment linear ... selectivity and a plateau section in between for the length range where fish are assumed fully selected. Using ... -2005 the upper arm of the gear selectivity function for trawlers is estimated using a two-stage process ... . In the first stage I estimate a parameter for each 40 mm wide length bin from the fit of a binomial ...

   Meeting Document : WG-FSA-05/65 : Auteur(s): S.G. Candy (Australia)

2. Cephalopods and mesoscale oceanography at the Antarctic polar front: satellite tracked predators locate pelagic trophic interactions

   cephalopod stocks in the Antarctic Polar Frontal Zone (PFZ). This is a vast, remote region where large ... monitor foraging at sea in January-March 1994. A foraging area at the PFZ, north of South Georgia, was ... located, an acoustic survey undertaken and a fixed station established where acoustic targets were found ... . A net survey was carried out with a commercial pelagic trawl, a rectangular midwater trawl 25 m2 ...

   Meeting Document : WG-EMM-96/12 : Auteur(s): Murphy, E.J., Trathan, P.N., White, M.G., Bone, D.G., Hatfield, E.M.C., Rodhouse, P.G., Prince, P.A., Watkins, J.L.

3. Selectivity of standard polish commercial trawl codends on Antarctic fishing grounds

   Abstract:  steelon codends used in commercial fishery, with a nominal mesh size A = 80 mm and A ... = 100 mm, made of double twines with a thickness of 4.2 mm. The studies covered 6 major fish species. 1 ... satisfactory. 2. Scotia Sea icefish, Chaenodraco wilsoni, and Chionodraco rastrospinosus exhibit a lower ... solution to the problem of ensuring selectivity of codends at a sufficiently good level seems possible as a ...

   Meeting Document : SC-CAMLR-VII/BG/11 : Auteur(s): J. Zaucha (Poland)

4. On the state of Champsocephalus gunnari stock in Subarea 48.3 and methods of its assessment

   2000 showed clearly a necessity to revise the methods of icefish (which is near-bottom and pelagic fish ... species) biomass assessment based on the results of bottom trawl surveys. A question on unreliability of ... ) both during the period of the icefish fishery in 1980s and after its ceasing in 1990s. In all cases, a ... , catch per unit effort (CPUE), and calculations by VPA showed a clear underestimation of the stock (Table ...

   Meeting Document : WG-FSA-00/45 : Auteur(s): K. Shust, V. Senioukov, P. Gasiukov and A. Kozlov (Russia)

5. Towards developing diagnostics tools for fishery stock assessments

   Abstract:  In this paper, we describe developments towards a set of standard diagnostic principles ... and tools used to characterise assessment models. CCAMLR has yet to develop a set of recommended ... statistical diagnostics tools to support their evaluations. While there are a number of standard visual and ... statistical diagnostics available for integrated assessments, their sufficiency to evaluate if a model is well ...

   Meeting Document : WG-SAM-15/26 : Auteur(s): P. Ziegler, P. Burch, A. Constable (Australia), C. Darby (United Kingdom), A. Dunn (New Zealand), C. Jones, D. Kinzey (USA), S. Mormede (New Zealand) and D. Welsford (Australia)

6. Using production models to assess the stock of Paralomis spinosissima around South Georgia Island

   Abstract:  Four production models were fit to a time series of daily catch per unit effort (CPUE ... considered recruitment in different ways. Model 1 contained a linear recruitment function; Model 2 had ... constant recruitment; Model 3 contained a Beverton-Holt recruitment function, and Model 4 used a Ricker ... abundance (N0), an estimate of the scaling coefficient relating abundance to CPUE (q), and a recruitment ...

   Meeting Document : WG-FSA-93/23 : Auteur(s): George Watters (USA)

7. Update on the Top Predator Alliance project, 2013–14 season: Killer whales

   reliance on toothfish as a critical prey item, have limited our ability to (a) assess the risk posed by the ... toothfish parts; no consumption of non-fish prey by TCKW was detected.  We also observed a large number of ... TCKW with small and presumably suckling calves.  Given that lactation represents a significant energy ... lactation.  A comparison of energy expenditure with energy densities of fish prey indicates that available ...

   Meeting Document : WG-EMM-14/52 : Auteur(s): R. Eisert, M.H. Pinkerton (New Zealand), L. Torres (USA), R.J.C. Currey, P.H. Ensor, E.N. Ovsyanikova, I.N. Visser (New Zealand) and O.T. Oftedal (USA)

8. OPTIONS FOR USING UNREPLICATED ECOSYSTEM MONITORING DATA TO DETECT IMPACTS

   . Furthermore, CEMP data cannot be used in a standard environmental impact assessment framework as they lack ... an important challenge. Potential strategies are likely to consist of a method for inferring impacts ... and a schedule of tactical interventions in response to these impacts (e.g. restrictions on fishing ... activity). We discuss a range of inference methods which are tractable using CEMP data. These methods ...

   Meeting Document : WG-EMM-09/26 : Auteur(s): S. Hill, J. Forcada, P. Trathan and C. Waluda (United Kingdom)

9. Investigating emigration in stock assessment models of Antarctic toothfish (Dissostichus mawsoni) in Subarea 88.2 SSRUs 88.2C–H

   Abstract:  In 2013, the Scientific Committee of CCAMLR could not achieve consensus on a stock ... the recaptures of tagged fish seen in the SSRU 88.2H fishery. The patterns showed a sharp decay rate ... of a cohort of tagged fish with few being recaptured after more than 3 years at liberty, a steepening ... of the decay rate over time, and a trend for increasing proportions of tagged fish caught over time ...

   Meeting Document : WG-FSA-14/56 : Auteur(s): S. Mormede, A. Dunn and S.M. Hanchet (New Zealand)

10. Results of the sixth Ross Sea shelf survey to monitor abundance of sub-adult Antarctic toothfish in the southern Ross Sea, January 2017

    Abstract:  At its 2011 meeting, the Scientific Committee agreed that a time series of relative ... abundance from a well-designed survey could be a useful input into the Ross Sea stock assessment model. In ... southern Ross Sea (Strata A–C) using standardised gear in a standardised manner; and monitoring trends in ... . Scaled length frequencies for the core strata indicate the progression of a strong year class that ...

    Meeting Document : WG-SAM-17/01 : Auteur(s): K. Large, L. Robinson and S. Parker

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