Résultats de la recherche

1. Killer whale (Orcinus orca) and sperm whale (Physeter macrocephalus) interactions with longline vessels in the Patagonian toothfish fishery at South Georgia, South Atlantic

   most abundant marine mammal observed in the vicinity of vessels when lines were being hauled, being ... no cetaceans were present. Catch rates were slightly higher in the presence of sperm whales and it is ... of unrecorded fish removals on stock assessment models, modifications in the behaviour of marine ... with longline vessels in the Patagonian toothfish fishery at South Georgia, South Atlantic Abstract ... abundant marine mammal observed in the vicinity of vessels when lines were being hauled, being present ... during which no cetaceans were present. Catch rates were slightly higher in the presence of sperm ... implications such as the effect of unrecorded fi sh removals on stock assessment models, modifi cations in the ... in this zone is restricted to the winter months to reduce the incidental mortality of seabirds ...

   Science Journal Paper : CCAMLR Science, Volume 11 (CCAMLR Science, Volume 11) : 111–126 : Auteur(s): Purves, M.G., D.J. Agnew, E. Balguerías, C.A. Moreno and B. Watkins

2. Towards an initial operational management procedure for the krill fishery in Subareas 48.1, 48.2 and 48.3

   (Euphausia superba) in Subareas 48.1, 48.2 and 48.3 requires a basis for the assessment of resource status ... 0.75 CPUE ref. An operating model of krill dynamics in the region is developed for simulation testing ... Paper Title:  Towards an initial operational management procedure for the krill fishery in ... , and an algorithm for specifying the levels of regulatory mechanisms (e.g., a catch control law) that ... estimation of the fraction of the mean unexploited biomass level at which MSY (in an average sense) is ... of krill dynamics in the region is developed for simulation testing purposes. A provisional ... the krill resource in the region; 192 (ii) an algorithm for specifying appropriate levels of ... discussion is in the context of a developing fishery - hence the reference to an "initial" procedure. The ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 189–219 : Auteur(s): Butterworth, D.S.

3. Krill (Euphausia superba) distribution in relation to water movement and phytoplankton distribution off the northern South Shetland Islands

   1990/91 a survey was conducted by RV Kaiyo Maru in the vicinity of the South Shetland Islands and ... concentration of krill and to estimate krill biomass in the area surveyed. Krill biomass estimation was done by ... observed. Main krill concentrations were observed in shelf waters north of the islands as usual. Tracking ... of buoys demonstrated the existence of convergent complex eddies in shelf waters of these islands. A ... conducted by RV Kaiyo Maru in the vicinity of the South Shetland Islands and Elephant Island. The main ... estimate lain biomass in the area surveyed. Krin biomass estimation was done by means of hydroacoustics ... lain concentrations were observed in shelf waters north of the islands as usual. Tracking of buoys ... demonstrated the existence of convergent complex eddies in shelf waters of these islands. A high concentration ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/8 (Selected Scientific Papers, SC-CAMLR-SSP/8) : 123–140 : Auteur(s): Ichii, T., H. Ishii and M. Naganobu

4. Target strength studies on Antarctic silverfish (Pleuragramma antarcticum) in the Ross Sea

   -larvae of P. antarcticum with a total length from 13 to 70 mm, were conducted in the southeast of the ... relationships. In the authors’ opinion the model could be used to give a first indication of the absolute ... abundance of P. antarcticum in the Ross Sea. A critical point is the decision rule to be used to ... of the Ross Sea. Following the three-frequency decision criterion described in Azzali et al. (2004 ... of the catch accounts for the largest proportion of variation in mean in situ TS estimation. Other ... difference in sound speed should not affect the measurements of the mean volume backscattering coefficient ... 1.7% (spheroid) to 2.6% (ellipsoid) (in good agreement with the mean characteristics of fish soft ... were used, giving |Rv| = 0.22, which is in reasonable agreement with the mean characteris- tics of ...

   Science Journal Paper : CCAMLR Science, Volume 17 (CCAMLR Science, Volume 17) : 75–104 : Auteur(s): Azzali, M., I. Leonori, I. Biagiotti, A. De Felice, M. Angiolillo, M. Bottaro and M. Vacchi

5. A hypothetical life cycle for Antarctic toothfish (Dissostichus mawsoni) in the Ross Sea region

   of the smallest toothfish taken in the toothfish fishery. The hypothesis presented is that D. mawsoni ... in CCAMLR Subareas 88.1 and 88.2 spawn mainly on the ridges and banks of the Pacific-Antarctic ridge ... along the continental slope and shelf to the east of the Ross Sea in Subarea 88.2. As the juveniles grow ... Paper Title:  A hypothetical life cycle for Antarctic toothfish (Dissostichus mawsoni) in the Ross ... reproduction, size distribution and movements of Antarctic toothfish (Dissostichus mawsoni) in the Ross Sea ... were moderately consistent with the distribution of the smallest toothfish taken in the toothfish ... considerable amounts of data have been gathered from D. mawsoni caught in the fishery. The fishery has been ... important implications for the management of toothfish in Subareas 88.1, 88.2 and 88.3. There have been ...

   Science Journal Paper : CCAMLR Science, Volume 15 (CCAMLR Science, Volume 15) : 35–53 : Auteur(s): Hanchet, S.M., G.J. Rickard, J.M. Fenaughty, A. Dunn and M.J. Williams

6. Fish distribution and biomass in the Heard Island zone (Division 58.5.2)

   . In order to assess the potential of this area for commercial fishing, and to obtain some preliminary ... Paper Title:  Fish distribution and biomass in the Heard Island zone (Division 58.5.2) Abstract ... / Description:  Division 58.5.2 encompasses the southern part of the Kerguelen plateau, and contains Heard ... distribution, abundance and biology of the most important species, covering a number of years and seasons. Five ... ., 1985). In order to assess the potential of this area for commerc ia l f ishing, a n d t o ob t a ... in contact with the bottom. Survey design - Estimates of abui~dance were derived from a swept ... the results from these two strata in autumn 1990; * the minimum number of trawls on Discovery ... density of C. gunnari found there during autumn 1990 and on the joint Soviet/Australian survey in 1987 ...

   Science Journal Paper : CCAMLR Science, Volume 2 (CCAMLR Science, Volume 2) : 1–20 : Auteur(s): Williams, R. and W.K. de la Mare

7. Surface water circulation in krill fishing areas near the South Shetland Islands

   deployed in shelf and oceanic waters to the north of the South Shetland Islands. Each buoy was deployed ... sluggish southwest current with a series of small-scale circular and semi-circular flows in the shelf ... calculations. The picture obtained of the surface circulation was considered in conjunction with the ... distribution of krill catches taken in the area by Japanese vessels during the period from 1981 to 1994. It is ... current with a series of small-scale circular and semi-circular flows in the shelf region, whereas the ... . The picture obtained of the surface circulation was considered in conjunction with the distribution ... of krill catches taken in the area by Japanese vessels during the period from 1981 to 1994. It is ... which contribute to the formation of stable krill concentrations in the area. The observed long ...

   Science Journal Paper : CCAMLR Science, Volume 3 (CCAMLR Science, Volume 3) : 125–136 : Auteur(s): Ichii, T. and M. Naganobu

8. Biological parameters for icefish (Chionobathyscus dewitti) in the Ross Sea, Antarctica

   empty and the few prey items recovered were generally in advanced stages of digestion. This may be due ... Paper Title:  Biological parameters for icefish (Chionobathyscus dewitti) in the Ross Sea ... Antarctic toothfish (Dissostichus mawsoni) in the Ross Sea (CCAMLR Subareas 88.1 and 88.2). Biological data ... , meristics, reproductive biology, diet and age estimation. All of the icefish sampled were identified as ... - sation. Under this model, the mean length, Lj, of the jth fish in a group of fish is: 1 1 2 1 2 1 1 ... Introduction There are about 15 species of icefish (Chan- nichthyidae), all but one of which are found in the ... icefish (Channichthyidae), in- cluding C. dewitti, by measuring the relative posi- tions of dorsal and ... anal fins in relation to vertebrae. Takahashi and Iwami (1997) investigated the diet of demersal fish ...

   Science Journal Paper : CCAMLR Science, Volume 15 (CCAMLR Science, Volume 15) : 139–165 : Auteur(s): Sutton, C.P., M.J. Manning, D.W. Stevens and P.M. Marriott

9. Trawl bag selectivity in the Champsocephalus gunnari fishery

   were carried out in June 1990 in the South Georgia area concurrently with trawl surveys as part of the ... Paper Title:  Trawl bag selectivity in the Champsocephalus gunnari fishery Abstract / Description ... and the selectivity factor was 3.10 for a mesh size of 80 mm. Comparison of these results with results ... cm) as well as earlier sexual maturation of fish were noted. It was suggested that the use of Polish ... knots with a catch of 50 tonnes showed the mean values of the angle of the corner of the top mesh in ... 1990 in the South Georgia area concurrently with trawl surveys as part of the main biological and ... 296 in the C. gunnari fishery should be conducted in the near future on the basis of this material ... of 54°25'S, 38°1O'W at depths of 230 to 250 m. The four-mile-long fishing site extended in a north ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 295–312 : Auteur(s): Bidenko, V.G. and I.G. Istomin

10. The 1991/92 fishery for Dissostichus eleginoides in Subarea 48.3

    0.2 in the Bulgarian. These differences were probably a result of the different hook types used by the ... Paper Title:  The 1991/92 fishery for Dissostichus eleginoides in Subarea 48.3 Abstract ... / Description:  The 1991/92 longline fishery for Dissostichus eleginoides in Subarea 48.3 was open from 4 ... Chilean vessels. The maximum catch taken in a five-day period was 375 tonnes. Catch rate was not ... increasing proportion of larger fish in the northwest area. Mean weights from the Bulgarian fishery showed ... . Mean weight of fish in the Russian and Bulgarian fisheries did not change over the period of the ... vessels was far in excess of that for Russian and Bulgarian vessels, with the former having a mean CPUE ... time for the lines. This lead to very different times in the water for the first group of vessels, but ...

    Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/9 (Selected Scientific Papers, SC-CAMLR-SSP/9) : 31–48 : Auteur(s): Agnew, D.J. and C.A. Moreno

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