Résultats de la recherche

1. The ecosystem approach to managing fisheries: achieving conservation objectives for predators of fished species

   across a range of 'ecosystem' effects and, as formulated here, can also be related directly to ... fisheries impact incidentally on an ecosystem, (ii) what should be the conservation objectives for predators ... of fished species, and (iii) what approaches could be considered for achieving the conservation ... , theory tells us that predators of fished species would be competing with the fishery only if they are ... fished species? The advantage of such evaluations is that the initial management system can be built on ... met by fisheries. These points are illustrated using a simple simulation model that could be used as ... interactions between species. Species that directly interact with the target and by-catch species (hereafter ...

   Science Journal Paper : CCAMLR Science, Volume 8 (CCAMLR Science, Volume 8) : 37–64 : Auteur(s): Constable, A.J

2. A study of Patagonian toothfish (Dissostichus eleginoides) post-tagging survivorship in Subarea 48.3

   . Toothfish were kept in tanks with seawater replacement for at least 12 hours after tagging. On one vessel ... , fish with a variety of injuries were selected to see if this affected recovery. In the final analysis ... , 396 animals were included, with an overall survivorship of 90%. Smaller animals and animals in better ... suggest that experienced observers using animals in good condition would normally achieve a toothfish post ... observer had only chosen fish that were judged to be in good or average condi- tion and otherwise suitable ... that had been tagged and released in earlier years, or were assumed to be fish that had fallen off the ... on survivorship was most significant for fish greater than 90 cm, with a suggestion that ... information from observers, who report that large fish are difficult to tag. However, it also might be an ...

   Science Journal Paper : CCAMLR Science, Volume 13 (CCAMLR Science, Volume 13) : 279–289 : Auteur(s): Agnew, D.J., J. Moir Clark, P.A. McCarthy, M. Unwin, M. Ward, L. Jones, G. Breedt, S. Du Plessis, J. Van Heerdon and G. Moreno

3. Potential nursery areas for fish in the Prydz Bay region

   survey with a fine-meshed midwater trawl in Prydz Bay in January/February 1991 indicated the potential ... for the shelf area of the Bay to be a nursery ground for nototheniid and channichthyid fish. Nearly ... area could be considered a nursery area. File:  22-Williams.pdf ... alone will be analysed. Pleuragramma antarcticum constituted the great majority of the catch, with ... that nearly all juvenile fish caught in the Prydz Bay region are associated with the continental shelf ... the shelf break area, and while channichthyid catches are much lower, it should be remembered that ... PRYDZ BAY REGION R. Williams* * Abstract A survey with a fine-meshed midwater trawl in Prydz Bay ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/8 (Selected Scientific Papers, SC-CAMLR-SSP/8) : 369–380 : Auteur(s): Williams, R.

4. Factors affecting the incidental mortality of seabirds in the Dissostichus eleginoides fishery in the southwest Atlantic (Subarea 48.3, 1995 season)

   with the information collected by international scientific observers from each vessel. It was thus ... . aequinoctialis (8.9%). A study of the variables affecting incidental mortality shows that the distance from land ... in vessels' analyses of catch of birds per unit effort (BPUE), as well as of the haul-by-haul ... board the FV Marunaka. It should also be noted that neither vessel deployed streamer lines. Effect ... cycle and distance from shore, showed that 72 hauls were made without streamer lines and 17 with ... conservation measure adopted to minimise incidental mortality is that requiring longlines to be set only ... disagree with this view and show that this factor is significant when considered in isolation. The ...

   Science Journal Paper : CCAMLR Science, Volume 3 (CCAMLR Science, Volume 3) : 79–91 : Auteur(s): Moreno, C.A., P.S. Rubilar, E. Marschoff and L. Benzaquen

5. Observation of seabirds in the Southern Ocean in 1988/89

   Antarctic coast. It should be noted that thin new ice with an ice density of 10 points covered the entire ... flocks while the numbers of snow petrel did not exceed 200 individuals. It ought be noted that for the ... (100 at one observation shift) was recorded in the Mawson Sea. It should be noted that between two and ... area, the Mawson Sea, indicated that this may be its permanent feeding ground and possibly, breeding ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 521–542 : Auteur(s): Vagin, A.V. and V.V. Popov

6. Hook selectivity in the longline fishery of Dissostichus eleginoides (Nototheniidae) off the Chilean coast

   the coast of Valdivia, South East Pacific, are also taken into consideration. The data show that ... caught with straight hooks Nos 3 and 4 are not significantly different, but hooks No. 3 are nearly 31 ... worth noting that the ratio of females increases significantly in catches, when the size of straight ... captured fish. This analysis agrees with the conclusion of SRL (1987) that circle hooks are significantly ... than that of hook No. 4. This conclusion is in agreement with Zapata (1976). Figure 3 demonstrates ... also taken into consideration. The data show that circle hooks are far more efficient than straight ... hooks. The length frequency distributions of fish caught with straight hooks Nos 3 and 4 are not ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/8 (Selected Scientific Papers, SC-CAMLR-SSP/8) : 107–119 : Auteur(s): Moreno, C.A.

7. Large-scale peculiarities of phytocenosis species composition in the surface layer in the Antarctic Atlantic and Indian Ocean sectors

   samples (layer between 0 and 1 m) taken with a sampler towed by RV Professor Vize, Corethron criophilus ... be analysed. Comparisons showed that species composition of dominating diatoms in samples taken with ... ) taken with a sampler towed by RV Professor Vize, Corethron criophilus dominated over vast areas within ... la periferia sur de la Corriente Circumpolar Antartica. To study plankton over vast areas with ... filtration device with changeable filters (plankton net N 70) fitted to the reception hose made it possible ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/5 – Part II (Selected Scientific Papers, SC-CAMLR-SSP/5 – Part II) : 201-214 : Auteur(s): Makarov, R.R. and K.P. Fedorov

8. Intra-annual variability in the density of Antarctic krill (Euphausia superba) at South Georgia, 2002–2005: within-year variation provides a new framework for interpreting previous ‘annual’ estimates of krill density

   estimates with the observed pattern of within-year variability showed that some of the apparent ‘year-to ... /2000. Moored instruments provide valuable data that could be important for ecosystem-based management ... = 64.2). A sinusoidal regression model (period = 52 weeks) with time as the independent variable ... surveys in adjacent time periods, suggesting that the point estimates from moored instruments were ... instruments provide valuable data that could be important for ecosystem-based management at South Georgia ... moorings (Reid and Brierley, 2001). It has been shown previously (Reid and Brierley, 2001) that sizes of ... distribution, and thus that they can be used to infer target strength (TS). ‘Virtual’ survey transects ADCP ... ) such that mooring-based estimates of krill density could be considered in the context of possible ...

   Science Journal Paper : CCAMLR Science, Volume 14 (CCAMLR Science, Volume 14) : 27–41 : Auteur(s): Saunders, R.A., A.S. Brierley, J.L. Watkins, K. Reid, E.J. Murphy, P. Enderlein and D.G. Bone

9. A hybrid approach to acoustic classification and length estimation of krill

   can be used to estimate the radius of the backscattering cross section from a model such as that for ... (L) of a euphausiid with equivalent radius (afj / fi ) can be estimated by approximating its trunk ... ) = binomial coeffi cient). These estimates can be com- bined and estimation of the mean animal size that ... mean body length of 40 mm was estimated to be 41.9° (SD = 5.7°), which is about 12° more than that of ...

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

10. Analysis of albatross and petrel distribution within the CCAMLR Convention Area: results from the Global Procellariiform Tracking Database

    , the subareas with the highest proportion of albatross and petrel breeding distribution were Subareas ... petrel breeding ranges extend across the majority of the Convention Area. Subareas with the lowest ... identified, especially relating to studies of nonbreeding distribution. These data will be essential for ... Convention Area. This paper is the product of such an analysis, with the benefit of new data that have been ... ° was selected on the basis that this was likely to be the smallest practical unit for management on ... recognised that not all areas used by the albatrosses and petrels will be areas of foraging. However, these ... CCAMLR open and closed fishing periods that apply to Subarea 48.3 (open 1 May–31 August, closed 1 ...

    Science Journal Paper : CCAMLR Science, Volume 13 (CCAMLR Science, Volume 13) : 143–174 : Auteur(s): BirdLife International (prepared by C. Small and F. Taylor)

Pages