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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 : Autor(es): Rodhouse, P.G.
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A statistical method for estimating the level of IUU fishing: application to CCAMLR Subarea 48.3
, 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 ... and by-catch of birds. It utilises high quality, well-documented fi sheries protection vessel (FPV ... ) cruise data. The method takes explicit account of both ‘seen’ and ‘unseen’ IUU fi shing by using a ... bird catches by IUU vessels. In order to estimate an IUU catch there must have been at least one ... incident detected by the FPV, a theoretical maximum time over which this IUU activity could have occurred ...
Science Journal Paper : CCAMLR Science, Volume 12 (CCAMLR Science, Volume 12) : 119–141 : Autor(es): 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.
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 ... number of recaptures-at-age and model the population numbers- at-age by annual difference equations ... obtained by integrating an ordinary differential equation (ODE) for within-year population dynamics. The ... . Simulations which passed catch-at-age numbers to the estimation algorithm after perturbation by observational ... BODE model. The reason for this is explained by the confounding of selectivity parameter estimates ...
Science Journal Paper : CCAMLR Science, Volume 18 (CCAMLR Science, Volume 18) : 1–27 : Autor(es): Candy, S.G.
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Directed research. Antarctic Marine Living Resources (AMLR). A program development plan
Living Resources Convention Act of 1984, P.L. 98-623, was signed into law by President Reagan on November ... Antarctic Program.” The US Program of directed research is defined by this Program Development Plan. The ... research efforts which are being planned and undertaken by the member countries of the CCAMLR, in support ... Research Program (USARP) of basic research managed by the National Science Foundation (NSF), with the goal ... , was signed into law by President Reagan on November 8, 1984, implementing the CCAMLR for the United ... directed research is defined by this Program Development Plan. - 364 - The presence of large fishing ... research efforts which are being planned and undertaken by the member countries of the CCAMLR, in support ... . Antarctic Research Program (USARP) of basic research managed by the National Science Foundation (NSF), with ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/3 (Selected Scientific Papers, SC-CAMLR-SSP/3) : 363-373 : Autor(es): Office of Science and Technology, NMFS, NOAA, US Department of Commerce (USA)
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Length- and age-at-spawning of Antarctic toothfish (Dissostichus mawsoni) in the Ross Sea
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 ... developed group of oocytes accumulating at the final maturation stage by approximately May each year. The ... 133.2 cm (95% CI 130.9–135.7) by length. On average, males spawn at a younger age with an A50% of 12.8 ... years (95% CI 11.9–14.0) or 120.4 cm (95% CI 114.8–126.7) by length. Evidence of skip-spawning was ... (older) by applying the slope-derived ogive to the northern Ross Sea region depends on the proportion of ...
Science Journal Paper : CCAMLR Science, Volume 17 (CCAMLR Science, Volume 17) : 53–73 : Autor(es): Parker, S.J. and P.J. Grimes
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Scientific observations in CCAMLR fisheries – past, present and future
standard catch and effort data supplied by vessels, the collection of data by scientifically qualified ... management purposes. The Scheme of International Scientific Observation, adopted by CCAMLR in 1992, is ... which are covered by the CCAMLR System of Inspection. Under the scheme, observers are deployed under ... complicate matters. Therefore, in addition to the standard catch and effort data supplied by vessels, the ... collection of data by scientifi cally qualifi ed observers on board fi shing vessels has assumed prominence ... Scientifi c Observation, adopted by CCAMLR in 1992, is designed to gather and validate fi shery- related ... observation only and is separate from enforcement issues which are covered by the CCAMLR System of Inspection ...
Science Journal Paper : CCAMLR Science, Volume 12 (CCAMLR Science, Volume 12) : 81–98 : Autor(es): Sabourenkov, E.N. and E. Appleyard
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Preliminary atlas of Balaenopterid whale distribution in the Southern Ocean based on pelagic catch data
the locations of pelagic catches of Balaenopterid whales by month between 1931/32–1979/80. Two sets of ... maps were produced. The first series contains 24 maps of catches by species by month, and the second ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/2 (Selected Scientific Papers, SC-CAMLR-SSP/2) : 113-193 : Autor(es): Mizroch, S.A. et. al
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Long-term monitoring of krill recruitment and abundance indices in the Elephant Island area (Antarctic Peninsula)
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 ... . Proportional recruitment indices 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 ... significant fluctuations in krill density over the period 1977 to 1994 are also confirmed by this study using ... ). Furthermore it is necessary to know if high variability of the R, index is a real phenomenon or is biased by ...
Science Journal Paper : CCAMLR Science, Volume 4 (CCAMLR Science, Volume 4) : 19–35 : Autor(es): Siegel, V., W. de la Mare and V. Loeb
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Marine mammals and demersal longline fishery interactions in Crozet and Kerguelen Exclusive Economic Zones: an assessment of depredation levels
marine mammal species alone or in co-occurrence. In the Crozet EEZ, CPUE was found to be reduced by 22.5 ... longline fishing operations were reported by observers on board fishing vessels targeting Patagonian ... monitored. Interactions were observed in all fishing areas. The effect of depredation was assessed by ... % in the presence of killer whales, 12.1% by sperm whales, and 42.5% when both species were present ... mammal species alone or in co-occurrence. In the Crozet EEZ, CPUE was found to be reduced by 22.5% in ... ) negatively affected in the pres- ence of these species; and/or (ii) by the negative correlations found for ... reported by observers on board fi shing vessels targeting Patagonian toothfi sh (Dissostichus eleginoides ... . Interactions were observed in all fi shing areas. The effect of depredation was assessed by comparing catch ...
Science Journal Paper : CCAMLR Science, Volume 14 (CCAMLR Science, Volume 14) : 67–82 : Autor(es): Roche, C., C. Guinet, N. Gasco and G. Duhamel
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Supplementary data on exploited stocks in Division 58.5.1 (Kerguelen)
Notothenia rossii, a species which is at present only fishable as a by-catch. The total biomass of the stock ... , however, remains very low according to the assessments carried out by the 1987 and 1988 scientific ... increase has been recorded recently, accompanied by an increase in the abundance index, following a ... reduction in catch and fishing effort. This trend could well be reversed by too high a catch in 1988/89 ... fishable as a by-catch. The total biomass of the stock, however, remains very low according to the ... assessments carried out by the 1987 and 1988 scientific research cruises. The abundant 1985 cohort of ... since the creation of the EEZ, a slight increase has been recorded recently, accompanied by an increase ... reversed by too high a catch in 1988/89. Finally, it is not possible to accurately estimate the stock ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/6 (Selected Scientific Papers, SC-CAMLR-SSP/6) : 147–161 : Autor(es): Duhamel, G.