Search results
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Options for allocating the precautionary catch limit of krill among small-scale management units in the Scotia Sea
.5 . 6 0 W 6 0 S 5 5 S 6 5 S 2 0 W 3 0 W 4 0 W 5 0 W 7 0 W 4 8 .3 4 8 .2 4 8 .1 4 8 .4 S c o ti a S e a S o u th G e o rg ia S o u th O rk n e y Is la ... IN THE SCOTIA SEA R.P. Hewitt Southwest Fisheries Science Center 8604 La Jolla Shores Drive La Jolla, CA 92037 ... Drive La Jolla, CA 92037, USA J.L. Watkins British Antarctic Survey Natural Environment Research ... , la CCAMLR a établi une limite de capture de précaution de 4 millions de tonnes et a ensuite adopté ... management units in the Scotia Sea Abstract / Description: Following an assessment of Antarctic krill ... (Euphausia superba) in the Scotia Sea, CCAMLR established a precautionary catch limit of 4 million tonnes and ... catch limit for krill among the SSMUs so as to preclude the inadvertent concentration of catches in a ... small portion of the surveyed area. Five options for allocating the catch limit among the SSMUs in the ...
Science Journal Paper : CCAMLR Science, Volume 11 (CCAMLR Science, Volume 11) : 81–97 : Author(s): Hewitt, R.P., G. Watters, P.N. Trathan, J.P. Croxall, M.E. Goebel, D. Ramm, K. Reid, W.Z. Trivelpiece and J.L. Watkins
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An integrated stock assessment for the Patagonian toothfish (Dissostichus eleginoides) for the Heard and McDonald Islands using CASAL
s in D iv is io n 58 .5 .2 u si ng C A SA L . M od el D es cr ip ti on Se le ct iv ... eleginoides) aux îles Heard et McDonald (Division 58.5.2 de la CCAMLR) réalisée à partir de CASAL et de ... d'évaluation stratifiée aléatoire au chalut (RSTS) pluriannuelle, en données commerciales de capture selon la ... sexe et une seule zone, mais la complexité spatiale de la pêcherie est modélisée au moyen de fonctions ... representative of the main plateau, where juvenile fish are found, but are of relatively low intensity in effort ... compared to the commercial shots. In contrast, the commercial shots are very restricted in space ... , consisting of three main grounds. The model implemented in CASAL is a simple, single-sex, single-area ... population model, but spatial complexity in the fishery was modelled using separate fishing selectivity ...
Science Journal Paper : CCAMLR Science, Volume 15 (CCAMLR Science, Volume 15) : 1–34 : Author(s): Candy, S.G and A.J. Constable
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Length-at-age in juvenile Patagonian toothfish (Dissostichus eleginoides)
de distribución de la densidad de tallas era claramente polimodal, para determinar si las edades ... la densité était nettement polymodale, nous avons cherché à déterminer si les âges estimés par la ... en fonction de l’âge ont été comparées de manière graphique à la densité générale des longueurs ... observée. De plus, pour chaque poisson, un âge a été présumé en fonction de sa longueur, puis cet âge ... Paper Title: Length-at-age in juvenile Patagonian toothfish (Dissostichus eleginoides) Abstract ... estimated from reading otoliths in a goodness-of-fit test. The majority of the otoliths (83.6%) were ... observed in the length density represent different age cohorts separated by one year. File: 01ashford.pdf ...
Science Journal Paper : CCAMLR Science, Volume 9 (CCAMLR Science, Volume 9) : 1–10 : Author(s): Ashford, J., C. Jones, S. Bobko and I. Everson
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Marine mammals and demersal longline fishery interactions in Crozet and Kerguelen Exclusive Economic Zones: an assessment of depredation levels
identifi cación fotográfi ca dedicada principalmente a las orcas permitió identifi car un total de 103 ... ballenas. El análisis de la identifi cación fotográfi ca indicó que un pequeño número de orcas solitarias ... in g se ct or Sl op e Sa m pl e si ze t- va lu es P v al ue s 1 –1 7. 77 26 ... (Arctocephalus spp.) et les opérations de pêche à la palangre ont été enregistrées par les observateurs à bord ... Paper Title: Marine mammals and demersal longline fishery interactions in Crozet and Kerguelen ... 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 ...
Science Journal Paper : CCAMLR Science, Volume 14 (CCAMLR Science, Volume 14) : 67–82 : Author(s): Roche, C., C. Guinet, N. Gasco and G. Duhamel
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CCAMLR ecosystem monitoring and management: future work
incluye disposiciones para el uso de la información científi ca en el proceso de toma de decisiones. Si ... evaluación de los límites de captura toma en cuenta las necesidades de los depredadores. El éxito de este ... controlar la explotación sobre la base de la información científi ca disponible, y de las evaluaciones ... in g A d él ie p en gu in Po te nt ia l f or m an y pr ed at or s w it h co m pe ti ti ... : Harvesting of marine living resources in the Southern Ocean is managed by the Commission for the Conservation ... managing fisheries with the maintenance of ecological relationships included in the conservation objectives ... . In the late 1980s, CCAMLR’s precautionary approach was developed, incorporating principles of how to ... use scientific evidence in the decision-making process. Even though this approach was based on the ...
Science Journal Paper : CCAMLR Science, Volume 9 (CCAMLR Science, Volume 9) : 233–253 : Author(s): Constable, A.J
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Australian research on Antarctic bird and seal diets
predadores en el control del estado de las poblaciones de especies-presa es, por 10 tanto, muy limitado, si ... d'importantes especes de vertebres predateurs dans la baie de Prydz et autour des lies subantarctiques Heard ... et Macquarie. Plusieurs considerations emergent apres la confrontation et la recapitulation de ... resultats publies et non publies. Dans la baie de Prydz, centre de la zone d'etude prioritaire du ... data on the diets of important vertebrate predator species in Prydz Bay and around the sub-Antarctic ... results are collated and summarised, and several important points emerge. In Prydz Bay, on which is ... Pleuragramma antarcticum are important in most diets, and many predators can switch between prey species. The ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/5 – Part II (Selected Scientific Papers, SC-CAMLR-SSP/5 – Part II) : 231-249 : Author(s): Williams, R.
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CPUE indices used in Soviet krill fishery statistics from 1977 to 1992 and their possible utility for evaluation of relative changes in krill biomass
le 2 : C or re la ti on c oe ff ic ie nt s (C C s) b et w ee n ca tc h pe r ha ... d at a w er e us ed fo r C P U E c al cu la ti on o nl y w he n th e nu ... . 6 C C s be tw ee n ca tc h pe r ha ul a nd th e to w ti m e w er e ca lc ul at ed ... el ty pe a nd to ta l t ow ti m e w er e ca lc ul at ed . 10 C C s be tw ee ... Paper Title: CPUE indices used in Soviet krill fishery statistics from 1977 to 1992 and their ... possible utility for evaluation of relative changes in krill biomass Abstract / Description: Key catch-per ... -unit-effort (CPUE) indices used in Soviet krill fishery statistics, as well as the main sources of data ... fluctuations in haul duration due to the different fishing strategies used when targeting krill intended for ...
Science Journal Paper : CCAMLR Science, Volume 11 (CCAMLR Science, Volume 11) : 165–177 : Author(s): Litvinov, F.F., A.Z. Sundakov and V.I. Arkhipov
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A statistical method for estimating the level of IUU fishing: application to CCAMLR Subarea 48.3
un navire de surveillance en une année; dans le cas contraire, la pêche IUU est considérée comme ... de los barcos guardapesca (FPV). El método toma en cuenta explícitamente la pesca INDNR “observada ... ) de poisson et de la capture accidentelle d’oiseaux. Il utilise des données de campagnes de navires ... de surveillance des pêches de très bonne qualité et bien documentées. La méthode tient compte ... , and confidence intervals for, fish and bird catches by IUU vessels. In order to estimate an IUU catch ... there must have been at least one encounter with an FPV in a year; no encounters in a year are ... to have been observed when the IUU vessel and the FPV vessel were in the same place at the same time ... observed. These data were obtained in the early licensed fishery (1997) when few vessels used mitigation ...
Science Journal Paper : CCAMLR Science, Volume 12 (CCAMLR Science, Volume 12) : 119–141 : Author(s): Agnew, D.J. and G.P. Kirkwood
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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.
allowable catch under the set of decision rules applied in these CCAMLR fisheries (Constable and de la ... classes by combining F with a fishing selectivity function, Sa, gives (see Branch, 2009a, 2009b ... that it is usual to assume that both the form and parameter values for the function for Sa do not vary across ... AS S , where there are A age-classes considered for the population (i.e. so that Sa has a mean of 1), rather ... process error in predicted catch-at-age numbers. Simulations assumed 1 000 releases per year over 12 years ... perturbation by observational error were also carried out for each model in order to investigate the effect on ... estimates with that for M. In contrast, when sigmoidally shaped selectivity was simulated, and the ... functional form of selectivity was correctly specified in the BODE model, both models gave close to unbiased ...
Science Journal Paper : CCAMLR Science, Volume 18 (CCAMLR Science, Volume 18) : 1–27 : Author(s): Candy, S.G.
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Estimation of natural mortality for the Patagonian toothfish at Heard and McDonald Islands using catch-at-age and aged mark-recapture data from the main trawl ground
5 40 12 9 67 10 4 59 15 8 61 6 A ge d sa m pl e si ze : 90 55 9 72 5 78 ... 9 1 R an do m sa m pl e of le ng th s m ea su re d fr om th e ca tc h. 2 N um ... be r o f t ag s r el ea se d an d re ca pt ur ed e xc lu de s t ag s f or w hi ch re ca pt ur ... B in R es id ua l V ar ia nc e Bin mean expected recaptures B in re si du al v ar ia nc e 0 20 ... in integrated assessments via CASAL for the Heard and McDonald Islands (HIMI, Division 58.5.2 ... to 2008. A large proportion of the recaptures of fish released in this fishery were aged and these ... in R, based on alternative ordinary differential equations (ODE) for within-year population dynamics ... of M have been studied using simulation. In application to the data obtained for the HIMI main trawl ...
Science Journal Paper : CCAMLR Science, Volume 18 (CCAMLR Science, Volume 18) : 29–45 : Author(s): Candy, S.G., D.C. Welsford, T. Lamb, J.J. Verdouw and J.J. Hutchins