Résultats de la recherche
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Estimating the impact of depredation by killer whales and sperm whales on longline fishing for toothfish (Dissostichus eleginoides) around South Georgia
whales occur during May at the start of the season with the sightings becoming fewer towards the end of ... Paper Title: Estimating the impact of depredation by killer whales and sperm whales on longline ... data collected on longliners between 2003 and 2009 were analysed to look at the levels of depredation ... , and often appear to actively seek out fishing vessels and ‘strip’ the line of a large number of ... the start of the season with the sightings becoming fewer towards the end of the season in August ... end of the season; over the seven years, 27% of observed sets have been set in May, 26% in June and ... at the start of the season in the east and at the end to the west, which could imply that the ... , continuing westwards towards the end of the season and moving on towards the Falkland Islands or South ...
Science Journal Paper : CCAMLR Science, Volume 17 (CCAMLR Science, Volume 17) : 163–178 : Auteur(s): Moir Clark, J. and D.J. Agnew
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Notothenia (P.) guntheri stock status and TAC estimation in the area of Shag Rocks (Subarea 48.3)
, using F regression on fishing effort and using average weighted F. Prior to the beginning of fishery N ... Paper Title: Notothenia (P.) guntheri stock status and TAC estimation in the area of Shag Rocks ... -1987/88 were used to analyse N. guntheri stock status. On the basis of these data using VPA method with ... . guntheri abundance was estimated as 227 thousand tonnes (using all the above mentioned methods). For 1986 ... fishing effort and using average weighted F. Prior to the beginning of fishery N. guntheri abundance was ... TAC ESTIMATION IN THE AREA OF SHAG ROCKS (SUBAREA 48.3) K. Shust and R. Borodin Abstract Data ... . guntheri stock status. On the basis of these data using V P A method with different adjustments stock ... estimated as 227 thousand tonnes (using all the abovementioned methods). For 1986/87 the figure was only ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/5 – Part II (Selected Scientific Papers, SC-CAMLR-SSP/5 – Part II) : 53-68 : Auteur(s): Shust, K. and R. Borodin
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An assessment of the mackerel icefish (Champsocephalus gunnari) off Heard Island
survey conducted at the end of the 1997 fishing season would allow for a catch limit on the Heard Plateau ... Paper Title: An assessment of the mackerel icefish (Champsocephalus gunnari) off Heard Island ... Abstract / Description: Assessments of the abundance and potential yield of the mackerel icefish ... (Champsocephalus gunnari) populations at Heard Island are developed from the results of four scientific surveys ... tonnes for Sliell Bank. An assessment based on the results of a survey conducted at the end of the 1997 ... difference in the upper end of the distribution arises because the catch consists of age classes other than ... end of the run to median spawning biomass at time 0) and the probability of depletion to below 0.2 ... classes. Based on the results of a survey conducted at the end of the 1997 fishing season, some interim ...
Science Journal Paper : CCAMLR Science, Volume 5 (CCAMLR Science, Volume 5) : 79–101 : Auteur(s): de la Mare, W.K., R. Williams and A.J. Constable
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Movement, growth and available abundance to the fishery of Dissostichus eleginoides Smitt, 1898 at Heard Island, derived from tagging experiments
end of the size range normally found on the grounds. These four long-range movers provide the first ... Paper Title: Movement, growth and available abundance to the fishery of Dissostichus eleginoides ... Patagonian toothfish (Dissostichus eleginoides) in different sectors of the Southern Ocean are considered to ... be genetically distinct. However, in the Indian Ocean, it is largely unknown whether stocks are ... was at the upper end of the size range normally found on the grounds. These four long-range movers ... short time. The fi sh that moved from ground A to Kerguelen was at the upper end of the size range ... Heard Island trawl fi shery (CCAMLR Statistical Division 58.5.2) in May 1998 after the fi shery itself ... started in April 1997. The tagging program was initiated after a successful program had been running on ...
Science Journal Paper : CCAMLR Science, Volume 9 (CCAMLR Science, Volume 9) : 33–48 : Auteur(s): Williams, R., G.N. Tuck, A.J. Constable and T. Lamb
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Revised age and growth estimates for Antarctic starry skate (Amblyraja georgiana) from the Ross Sea
) from the Ross Sea Abstract / Description: A previous study on the age and growth of Amblyraja ... georgiana in the Ross Sea suggested that these skates initially grow very rapidly for about five years ... and growth in A. georgiana that is radically different from the published interpretation is presented ... . By counting fine growth bands in the caudal thorns instead of broad diffuse bands, growth curves have ... (Table 1). Reader 1’s growth curve fitted the data at the upper end bet- ter and had more plausible ... age and gRowth estimates foR antaRctic staRRy skate (AmblyrAjA georgiAnA) fRom the Ross sea M.P ... , Wellington New Zealand Email – m.francis@niwa.co.nz M.J. Gallagher Irish Sea Fisheries Board The New ... Pier, Killybegs Co. Donegal, Ireland Abstract A previous study on the age and growth of Amblyraja ...
Science Journal Paper : CCAMLR Science, Volume 16 (CCAMLR Science, Volume 16) : 211–220 : Auteur(s): Francis, M.P. and M.J. Gallagher
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Biological characteristics of Antarctic fish stocks in the southern Scotia Arc region
Lepidonontothen squamifrons was spawning while Trematomus hansoni was already coming to the end of its ... Paper Title: Biological characteristics of Antarctic fish stocks in the southern Scotia Arc ... region Abstract / Description: Commercial exploitation of finfish in the southern Scotia Arc took place ... from 1977/78 to 1989/90, and was in its heyday from 1977/78 to 1981/82. Except for Elephant Island, the ... hansotzi was already coming to the end of its reproductive season. Chionodraco rastvospinostis and ... Trematomus hansoni) were spawning in March or were approaching the end of their spawning season (T ... Georgia where the species was already mature towards the end of its third year of life (Kock and Everson ... at South Georgia. The stock was depleted within two seasons after about 500 000 tonnes had been ...
Science Journal Paper : CCAMLR Science, Volume 7 (CCAMLR Science, Volume 7) : 1–41 : Auteur(s): Kock, K.-H., C.D. Jones and S. Wilhelms
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Long-term monitoring of krill recruitment and abundance indices in the Elephant Island area (Antarctic Peninsula)
Paper Title: Long-term monitoring of krill recruitment and abundance indices in the Elephant ... for the Elephant Island area with regard to the representativeness of the study area (60°-62 o 30´S ... 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 ... generally reaches its maximum at the end of December (Siegel, 1988). This maximum can be observed until ... approximately four weeks to give an earlier start or later end to the cycle. From March onward, the krill ... mesh selection occurs for krill smaller than 20 mm (Siegel, 1986), which is the lower end of the ... boundary of the area after 25 days. In 1995 anather buoy was released close to the continental slope in ...
Science Journal Paper : CCAMLR Science, Volume 4 (CCAMLR Science, Volume 4) : 19–35 : Auteur(s): Siegel, V., W. de la Mare and V. Loeb
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Precautionary measures for a new fishery on Martialia hyadesi (Cephalopoda, Ommastrephidae) in the Scotia Sea: an ecological approach
. hyadesi after the chick-rearing period of the most sensitive predator (grey-headed albatross) would ... minimise competition locally and ensure that the fishery only exploited the stock after escapement from ... , Ommastrephidae) in the Scotia Sea: an ecological approach Abstract / Description: In anticipation of the ... development of a new fishery for the ommastrephid squid Martialia hyadesi in the Scotia Sea, this paper ... consume relatively small and immature specimens of M. Izyadesi. Fishing for M. hyadesi after the chick ... and ensure that the fishery only exploited the stock after escapement from most higher predator ... adults returning to feed the chicks (most species) or from chicks on the nest immediately after being ... effects for predators. Holding the fishery closed until after the breeding season of grey-headed ...
Science Journal Paper : CCAMLR Science, Volume 4 (CCAMLR Science, Volume 4) : 125–139 : Auteur(s): Rodhouse, P.G
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Natural mortality rate in the mackerel icefish (Champsocephalus gunnari) around South Georgia
(Champsocephalus gunnari) from the period prior to known large-scale commercial harvesting is discussed. After ... Paper Title: Natural mortality rate in the mackerel icefish (Champsocephalus gunnari) around ... South Georgia Abstract / Description: Information on natural mortality rates of the mackerel icefish ... careful consideration of the data and available methods, several errors are noted in earlier estimates ... prior to known large-scale commercial harvesting is discussed. After careful consideration of the data ... . The age/length key from 1972 was obtained from a period several years after large-scale fishing ... composition data used in this study because the catches were reported to have been made during or after the ... NATURAL MORTALITY RATE IN THE MACKEREL ICEFISH (CHMPSOCEPHALUS GUNNARn AROUND SOUTH GEORGIA I. Everson ...
Science Journal Paper : CCAMLR Science, Volume 5 (CCAMLR Science, Volume 5) : 245–257 : Auteur(s): Everson, I
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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.
of 500 000. Simulations which passed catch-at-age numbers to the estimation algorithm after ... multi-cohort simulation study comparing estimation for a model based on the Baranov equations versus a ... 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 ... the num- ber of recaptures. Representing end of each year by { }0 01,...,= + + fy t t n , the ... number of fish in the population at the end of fishing year yi in age class a. Appendix 3 gives the ... . Simulations which passed catch-at-age numbers to the estimation algorithm after perturbation by observational ... error on estimation of M, after the simulated data were obtained and before the ,iy aC were passed to ...
Science Journal Paper : CCAMLR Science, Volume 18 (CCAMLR Science, Volume 18) : 1–27 : Auteur(s): Candy, S.G.