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1. Assessments of by-catch in trawl fisheries at Heard and McDonald Islands

   / Description:  This paper assesses the potential for the commercial trawl fisheries in the Heard Island area ... (Statistical Division 58.5.2) to significantly affect, in the long term, spawning biomass of three taxa caught ... skates). The long-term annual yield for each of the three taxa was estimated using the generalised yield ... model (GYM) used by the CCAMLR Working Group on Fish Stock Assessment (WG-FSA). Input data included ... the end of 20 years of exploitation should be 75% of the pre-exploitation spawning biomass and that ... Abstract This paper assesses the potential for the commercial trawl fisheries in the Heard Island area ... (Statistical Division 58.5.2) to significantly affect, in the long term, spawning biomass of three taxa caught ... skates). The long-term annual yield for each of the three taxa was estimated using the generalised yield ...

   Science Journal Paper : CCAMLR Science, Volume 5 (CCAMLR Science, Volume 5) : 231–243 : Автор(ы): Constable, A.J., R. Williams and W.K. de la Mare

2. Editorial

   Paper Title:  Editorial Abstract / Description:  This is the 18th volume of CCAMLR Science and the ... contents reflect the important science that supports CCAMLR’s management of the marine living resources of ... the Southern Ocean. In particular there is a suite of papers that address key aspects of improving ... assessment of the population status of toothfish and of assessing the risk associated with gathering data and ... Science, Vol. 18 (2011): 167 167 This is the 18th volume of CCAMLR Science and the contents reflect the ... important science that sup- ports CCAMLR’s management of the marine living resources of the Southern Ocean ... . In particular there is a suite of papers that address key aspects of improving assessment of the ... population status of toothfish and of assessing the risk associated with gathering data and interpreting ...

   Science Journal Paper : CCAMLR Science, Volume 18 (CCAMLR Science, Volume 18) : 167 : Автор(ы): Editors

3. Spatial distribution of management measures, Antarctic krill catch and Southern Ocean bioregions: implications for conservation planning

   conservation planning for developing marine spatial protection includes analysis of the spatial distribution of ... fishing activities, existing management and ecological characteristics. This paper assesses the overlap ... between habitat (bioregion), existing spatial management and Antarctic krill catch in the Southern Ocean ... . The analysis required standardised information on the location and extent of spatial fisheries ... at the lower end of the meso-scale (~100 km in linear boundary extent), and is currently one of the ... CCAMLR has endorsed the development of a representative system of marine protected areas (MPAs) in the ... measure (CM) agreed by the Commission in 2011 (CM 91-04) sets out a general framework for establishing ... MPAs, stating that: ‘CCAMLR MPAs shall be established on the basis of the best available scientific ...

   Science Journal Paper : CCAMLR Science, Volume 20 (CCAMLR Science, Volume 20) : 1–19 : Автор(ы): Grant, S.M., S.L. Hill and P.T. Fretwell

4. Comparison of two methods to assess fish losses due to depredation by killer whales and sperm whales on demersal longlines

   conservation issues. However, estimating the amount of resource depredated can be especially challenging when ... depredation occurs on fish in the marine environment. This is the case for killer whales (Orcinus orca) and ... sperm whales (Physeter macrocephalus) depredation on the demersal Patagonian toothfish (Dissostichus ... eleginoides) longline fishery operating within the Crozet Islands EEZ (southern Indian Ocean). This study ... rates remain unchanged on a longline after odontocetes begin to depredate, while Patagonian toothfish ... -economic, ecological and conservation issues. However, estimating the amount of resource depredated can be ... especially challenging when depredation occurs on fish in the marine environment. This is the case for ... killer whales (Orcinus orca) and sperm whales (Physeter macrocephalus) depredation on the demersal ...

   Science Journal Paper : CCAMLR Science, Volume 22 (CCAMLR Science, Volume 22) : 1–14 : Автор(ы): Gasco, N., P. Tixier, G. Duhamel and C. Guinet

5. Determination of Antarctic krill acoustic back-scattering cross-section

   / Description:  When determining the density krill of concentrations it is necessary to know the acoustic cross ... -section of back-scattering of krill. The target strength can be determined in situ by measuring the echo ... signal from one specimen resolved by the hydroacoustic instrument. By calculating the mean level of the ... directivity diagramme of the antenna and the mean level of the standardized echo signal, it is possible to ... When determining the density krill of concentrations it is necessary to know the acoustic cross ... -section of back-scattering of krill. The target strength can be determined in situ by measuring the echo ... signal from one specimen resolved by the hydroacoustic instrument. By calculating the mean level of the ... directivity diagramme of the antenna and the mean level of the standardized echo signal, it is possible to ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/3 (Selected Scientific Papers, SC-CAMLR-SSP/3) : 141-152 : Автор(ы): Protaschuk, V.A. and T.A. Lukashova

6. 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 ... . Design of the prototype probability density functions To begin with, the three sets of , hB Δ ω were ... – Ancona Largo Fiera della Pesca, I-60125 Ancona, Italy Email – m.azzali@ismar.cnr.it Abstract The ... problem of acoustically identifying and estimating the sizes of two euphausiid species is considered. A ... euphausiid aggregation is represented by a three-dimensional probabilistic vector whose components are the ...

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

7. Preliminary model of krill fishery behaviour in Subarea 48.1

   :  A simple model of the behaviour of the krill fishery in FAO Statistical Subarea 48.1 (South Shetland ... Islands and Antarctic Peninsula) is described. Parameters of the model are calculated from Chilean fishery ... data over the period 1989 to 1992. The distribution of catches predicted by the model, which is ... restricted to the four months December to March, compares favourably with the historical distribution of ... simple model of the behaviour of the krill fishery in FAO Statistical Subarea 48.1 (South Shetland ... Islands and Antarctic Peninsula) is described. Parameters of the model are calculated from Chilean ... fishery data over the period 1989 to 1992. The distribution of catches predicted by the model, which is ... restricted to the four months December to March, compares favourably with the historical distribution of ...

   Science Journal Paper : CCAMLR Science, Volume 1 (CCAMLR Science, Volume 1) : 71–79 : Автор(ы): Agnew, D.J. and V.H. Marín

8. Marine mammals and demersal longline fishery interactions in Crozet and Kerguelen Exclusive Economic Zones: an assessment of depredation levels

   toothfish (Dissostichus eleginoides) in the Crozet and Kerguelen Islands Exclusive Economic Zones (EEZs ... ) between 2003 and 2005. In the Crozet EEZ, the reported interactions involved killer whales and sperm ... whales. These two species, alone or in co-occurrence with each other, were observed in 71% of the 1 308 ... longlines set. In the Kerguelen EEZ, the reported interactions involved sperm whales and fur seals. These ... attached to each end of the line. While sperm whales are able to dive to these depths, killer whales ... ) in the Crozet and Kerguelen Islands Exclusive Economic Zones (EEZs) between 2003 and 2005. In the ... Crozet EEZ, the reported interactions involved killer whales and sperm whales. These two species, alone ... or in co-occurrence with each other, were observed in 71% of the 1 308 longlines set. In the ...

   Science Journal Paper : CCAMLR Science, Volume 14 (CCAMLR Science, Volume 14) : 67–82 : Автор(ы): Roche, C., C. Guinet, N. Gasco and G. Duhamel

9. Selectivity of commercial and research trawls in relation to krill

   / Description:  This paper describes the results of fishing a single krill aggregation with a commercial trawl ... RT 72/308 and an Isaacs-Kidd midwater research trawl (IKMT). The commercial trawl catches contained ... more large krill (35-58 mm) than catches of the research trawl (30-54 mm). The maximum difference in ... krill length composition was observed between catches made by the research trawl, while in commercial ... This paper describes the results of fishing a single krill aggregation with a commercial trawl RT 72 ... /308 and an Isaacs-Kidd midwater research trawl (IKMT). The commercial trawl catches contained more ... large krill (35-58 mm) than catches of the research trawl (30-54 mm). The maximum difference in mean ... length composition was observed between catches made by the research trawl, while in commercial trawl ...

   Science Journal Paper : CCAMLR Science, Volume 4 (CCAMLR Science, Volume 4) : 161–169 : Автор(ы): Kasatkina, S.M

10. Estimating krill recruitment and its variability

    likelihood method is developed for the decomposition of krill density-at-length data into the proportion of ... surveys in the South Atlantic and the Indian Ocean sectors of the Southern Ocean give a mean recruitment ... rate for 1+ krill (the ratio of the number of krill aged one year to the number of krill aged one year ... and above) of 0.339 with a standard deviation (SD) of 0.100. The corresponding result for recruitment ... 7050 Tasmania, Australia Abstract A maximum likelihood method is developed for the decomposition ... of krill density-at-length data into the proportion of recruits in a population sampled by a net ... haul survey. Preliminary results from a series of five net haul surveys in the South Atlantic and the ... Indian Ocean sectors of the Southern Ocean give a mean recruitment rate for l+ krill (the ratio of the ...

    Science Journal Paper : CCAMLR Science, Volume 1 (CCAMLR Science, Volume 1) : 55–69 : Автор(ы): de la Mare, W.K

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