Search results

1. Estimation of natural mortality using catch-at-age and aged mark-recapture data: a multi-cohort simulation study comparing estimation for a model based on the Baranov equations versus a new mortality equation.

   τ - = - -å . (15) In simulation studies this last form of the like- lihood for number of recaptures was found ... number of recaptures-at-age and model the population numbersat- age by annual difference equations ... obtained by integrating an ordinary differential equation (ODE) for within-year population dynamics. The ... perturbation by observational error were also carried out for each model in order to investigate the effect on ... so for the BODE model. The reason for this is explained by the confounding of selectivity parameter ...

   Science Journal Paper : CCAMLR Science, Volume 18 (CCAMLR Science, Volume 18) : 1–27 : Author(s): Candy, S.G.

2. A statistical method for estimating the level of IUU fishing: application to CCAMLR Subarea 48.3

   the various areas could not be found, because vessels tend to fi sh predominantly in one area and thus ... , unregulated and unreported (IUU) catches of fish and by-catch of birds. It utilises high quality, well ... ’ and ‘unseen’ IUU fishing by using a simulation model to arrive at statistically rigorous estimates of ... , and confidence intervals for, fish and bird catches by IUU vessels. In order to estimate an IUU catch ... interpreted as zero IUU fishing. For each IUU incident detected by the FPV, a theoretical maximum time over ...

   Science Journal Paper : CCAMLR Science, Volume 12 (CCAMLR Science, Volume 12) : 119–141 : Author(s): Agnew, D.J. and G.P. Kirkwood

3. Distribution of the Soviet krill fishing fleet in the South Orkneys area (Subarea 48.2) during 1989/90

   over oceanic areas, and targeted krill aggregations found in the major current flowing towards ... aggregations found in the major current flowing towards the north-east of the region. The fleet was observed ... fished over oceanic areas, and targeted krill aggregations found in the major current flowing towards ... an exploratory tack where the most dense and extended swarms were found, the vessel turned around and retraced ... . If such patches were available locally, certainly some would be found and exploited by the fleet, since some ... found in coastal or shelf-break areas. In shelf and coastal areas hydrodynamic processes may promote ...

   Science Journal Paper : CCAMLR Science, Volume 5 (CCAMLR Science, Volume 5) : 51–62 : Author(s): Sushin, V.A

4. A preliminary assessment of the stock of the ommastrephid squid Martialia hyadesi in the Scotia Sea based on data from predators

   been characterized by dramatically fluctuating annual catches and frequent switches to exploit new ... quantities by several other Southern Ocean vertebrate predators. Estimated annual consumption by known ... predators in the Scotia Sea is 326 098 to 330 642 tonnes, 94% of which is taken by southern elephant seals ... OF THE OMMASTREPHID SQUID MARTIALIA BY ADESI IN THE SCOTIA SEA BASED ON DATA FROM PREDATORS· P.G ... , Loliginidae and Ommastrephidae. Fisheries for the latter have been characterized by dramatically fluctuating ... seal and is probably taken in significant quantities by several other Southern Ocean vertebrate ... predators. Estimated annual consumption by known predators in the Scotia Sea is 326 098 to 330642 tonnes ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 479–480 : Author(s): Rodhouse, P.G.

5. Length- and age-at-spawning of Antarctic toothfish (Dissostichus mawsoni) in the Ross Sea

   for the presence of developing sperma- tocytes. Testes were found to be in one of three stages: Immature ... maturation stage by approximately May each year. The age at 50% spawning for females on the Ross Sea slope ... region is 16.6 years (95% CI 16.0–17.3) or 133.2 cm (95% CI 130.9–135.7) by length. On average, males ... ) by length. Evidence of skip-spawning was observed for females only and results in a flatter, right ... the overall population ogive is biased right (older) by applying the slope-derived ogive to the ...

   Science Journal Paper : CCAMLR Science, Volume 17 (CCAMLR Science, Volume 17) : 53–73 : Author(s): Parker, S.J. and P.J. Grimes

6. Factors that may influence the accuracy of abundance estimates from CCAMLR tag-recapture programs for Dissostichus spp. and best practice for addressing bias

   and released through blood loss, infection and lice attack. A study by Agnew et al. (2006a) found ... . United States Dept. of Agriculture Circular, 118: 1–4. Marlow, T.R., D.J. Agnew, M.G. Purves ... spatial structure of release and recapture efforts by fishing and research vessels, development of ...

   Science Journal Paper : CCAMLR Science, Volume 20 (CCAMLR Science, Volume 20) : 63–72 : Author(s): Welsford, D.C. and P.E. Ziegler

7. Long-term monitoring of krill recruitment and abundance indices in the Elephant Island area (Antarctic Peninsula)

   countercurrents flow from east to west in nearshore waters. The spawning stock is found north ... and Harm, 1996). A different juvenile size category is found regularly to the south and southeast ... "S, approximately from the tip of the Peninsula to the east; often they are found over the northern shelf ... were re-calculated applying the delta distribution approach introduced by de la Mare (1994a). The high ... interannual variability of krill recruitment is confirmed by the present analysis. Results are compared for ... krill density over the period 1977 to 1994 are also confirmed by this study using randomisation tests on ...

   Science Journal Paper : CCAMLR Science, Volume 4 (CCAMLR Science, Volume 4) : 19–35 : Author(s): Siegel, V., W. de la Mare and V. Loeb

8. Annual changes in species composition and abundance of myctophid fish in the north of South Georgia (Subarea 48.3), Antarctica, during austral winters from 2002 to 2008

   and G. nicholsi from larvae to adults were found, suggesting that these species may have their nursery ground ... from larvae to adults were found, suggesting that these species may have their nursery ground around ... abundant. Different life stages of K. anderssoni and G. nicholsi from larvae to adults were found ... and Kubodera, 1990; Duhamel, 1998; Pusch et al., 2004). However, E. antarctica has not been found in Japanese ... in Antarctic coastal waters. However, this species has not been found in Japanese trawl by-catch samples ...

   Science Journal Paper : CCAMLR Science, Volume 18 (CCAMLR Science, Volume 18) : 155–163 : Author(s): Iwami, T., M. Naganobu, K. Taki and M. Kiyota

9. Distribution, biomass and characteristics of the Euphausia superba fishery around South Georgia (Subarea 48.3)

   data and biomass assessments have been tabulated and illustrated by various survey maps. It was found ... been tabulated and illustrated by various survey maps. It was found that the distribution of krill ... and biomass assessments have been tabulated and illustrated by various survey maps. It was found ... it took place and areas where abundance of krill was found to be greatest. 128 It should also ... and small catches the fishing fleet found it impossible to operate in the area (see catch statistics ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 123–147 : Author(s): Latogursky, V.I., R.R. Makarov and L.G. Maklygin

10. Mitigation of seabird captures during hauling in CCAMLR longline fisheries

    . Although the United Nations Food and Agriculture Organization’s International Plan of Action for Seabirds ... curtain on board Patagonian toothfish longliners. References Food and Agriculture Organization ... hauling in CCAMLR longline fisheries. Haul captures were first recognised by CCAMLR as a problem as early ... exclusion devices (BEDs) placed around the hauling bay. Data collected by scientific observers since 2003 ... these two key functional characteristics into the specification of a BED to be deployed by longline ...

    Science Journal Paper : CCAMLR Science, Volume 17 (CCAMLR Science, Volume 17) : 155–162 : Author(s): Reid, E., B. Sullivan and J. Clark

Pages