Resultados de la búsqueda
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Food consumption by predators in a CCAMLR integrated study region
/ Description: A detailed description of the structure and mode of operation of a model for estimating food ... consumption of seabird predators is provided. This model is a development of earlier ones used in the South ... provided, illustrating the changes produced by using these new sub-models. Results of initial sensitivity ... analyses indicate particular sensitivity to estimation of metabolic energy requirements. The system is ... ). If periods ashore, when the animals are fasting, were regarded as involving no food consumption, the ... detailed description of the structure and mode of operation of a model for estimating food consumption of ... seabird predators is provided. This model is a development of earlier ones used in the South Georgia ... provided, illustrating the changes produced by using these new sub-models. Results of initial sensitivity ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 489–519 : Autor(es): Croxall, J.P., C. Ricketts and A.G. Wood
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Length-at-age in juvenile Patagonian toothfish (Dissostichus eleginoides)
. No difference was found between predicted and estimated ages. We conclude that the two dominant modes ... / Description: We used the otoliths from a sample of Dissostichus eleginoides pre-recruits, whose length ... the length modes observed. Length densities by age were compared graphically with the overall length ... estimated from reading otoliths in a goodness-of-fit test. The majority of the otoliths (83.6%) were ... ned as 1+ year old. As in previous years, apart from the dates of the groundfi sh survey, no ... compared with ages estimated from reading otoliths to test the null hypothesis that there was no ... interpreted as corresponding to the initiation of faster growth during late 1999/ 2000. No bias was ... . The goodness-of-fi t test included n = 232 fi sh of TL 23–46 cm; no difference was found between ...
Science Journal Paper : CCAMLR Science, Volume 9 (CCAMLR Science, Volume 9) : 1–10 : Autor(es): Ashford, J., C. Jones, S. Bobko and I. Everson
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Size at sexual maturity of Patagonian toothfish (Dissostichus eleginoides)
allowing for this bias indicates that L m50 for female fish in 1997 was no different to that for 1996. The ... (Dissostichus eleginoides) caught in the commercial fishery within Subarea 48.3. The results for 1996 indicate ... that L m50 occurs at 78.5 cm total length for male and 98.2 cm for female fish. In 1997 the results for ... male fish were essentially the same. For female fish there is evidence that in 1997 a significant ... that Lm50 for female fish in 1997 was no different to that for 1996. The implications of this ... is still a dearth of basic information on its ecology. There is still no precise information on the ... was that, due to the closure of the fishery, there were no data for August 1996; this category ... visible to the naked eye, about '1, length of the body cavity. Testis large, white and convoluted, no ...
Science Journal Paper : CCAMLR Science, Volume 6 (CCAMLR Science, Volume 6) : 37–46 : Autor(es): Everson, I. and A.W. Murray
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Midwater trawl catchability in relation to krill and possible ways of assessing gross catch
the basis of data obtained from AtlantNIRO expeditions from 1983 to 1990 in the Scotia Sea. A ... methodology was developed for and applied to determining the rate of krill filtration through the trawl rope ... and netting and also the probability that krill will come into contact with various parts of the net ... as it passes through the trawl sides. Studies were based on the results of 250 hauls made with a 72 ... . Frolov** Abstract Research into midwater trawl catchability rates was carried out on the basis of ... data obtained from AtlantNIRO expeditions from 1983 to 1990 in the Scotia Sea. A methodology was ... developed for and applied to determining the rate of krill filtration through the trawl rope and netting ... and also the probability that krill will come into contact with various parts of the net as it passes ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 87–113 : Autor(es): Zimarev, Yu.V., S.M. Kasatkina and Yu.P. Frolov
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Krill biomass in Area 48 and Area 58: recalculations of FIBEX data
/ Description: FIBEX acoustic and length frequency data held in the BIOMASS database were used to provide ... estimates of mean density and biomass for the Indian Ocean sector and the West Atlantic sector as well as ... estimates were calculated using the target strength relationships used at the original FIBEX acoustic ... workshop. Estimates for the different areas were also calculated using the target strength relationships of ... ., 1986 - p. 46), but no information was available for the Nella Dan. 2.1. 2 Acoustic Data Data were ... 41.4 mm for the cruise. Since no length frequency data were available for Kaiyo Maru, this TS value ... held in the BIOMASS database were used to provide estimates of mean density and biomass for the ... Indian Ocean sector and the West Atlantic sector as well as for FAO Statistical Area 41, and CCAMLR ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/9 (Selected Scientific Papers, SC-CAMLR-SSP/9) : 157–181 : Autor(es): Trathan, P.N., D.J. Agnew, D.G.M. Miller, J.L. Watkins, I. Everson, M.R. Thorley, E. Murphy, A.W.A. Murray and C. Goss
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An index of per capita recruitment
recruitment (PCR) is proposed such that where R 1 is the proportion of age-l animals sampled in year y and M ... is the post-recruit mortality rate. The intent of the index is to facilitate investigation of ... reproductive success and the factors postulated to affect it. The formulation of PCR is based on the ... animals spawn; (iii) a representative sample of the population is available; and (iv) the proportion of ... that the ratio of PCR to R/S would be 0.317 if half of age-2 animals spawn and to 0.266 if no age-2 ... R/S showed no central tendency with lower values more common than higher values. The distribution ... equilibrium spawning population but has no effect on the ratio of PCR and R/S. (iv) Increasing the rate at ... where R1 is the proportion of age-l animals sampled in year y and M is the post-recruit mortality rate ...
Science Journal Paper : CCAMLR Science, Volume 7 (CCAMLR Science, Volume 7) : 179–196 : Autor(es): Hewitt, R
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Age and growth of Antarctic euphausiacea (crustacea) under natural conditions
regressions. No difference in growth of krill was observed between the Antarctic Peninsula area and the ... Abstract / Description: Five species of Antarctic euphausiid crustaceans were studied from the Antarctic ... Peninsula and the south-eastern Weddell Sea. Life spans range from two years for Euphausia frigida to six ... years for the krill Euphausia superba. Growth in length and weight was calculated by non-linear ... Five species of Antarctic euphausiid crustaceans were studied from the Antarctic Peninsula and the ... south-eastern Weddell Sea. Life spans range from two years for Euphausia frigida to six years for the ... krill Euthausia superba. Growth in length and weight was ca culated by non-linear regressions. No ... difference in growth of krill was observed between the Antarctic Peninsula area and the eastern Weddell Sea ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/4 (Selected Scientific Papers, SC-CAMLR-SSP/4) : 369-370 : Autor(es): Siegel, V.
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Statistical problems in krill stock hydroacoustic assessments
-strength measurements. In the case of statistical methods, there are no clear guidelines for deciding what ... : Two primary issues are at question for hydroacoustic assessments of krill. The first is the methods ... applied to establish biomass in a survey area and the second is the improvement in accuracy of target ... method is most appropriate, this is made even more difficult by the fact that most survey methods assume ... assessments of krill. The first is the methods applied to establish biomass in a survey area and the second ... is the improvement in accuracy of target-strength measurements. In the case of statistical methods ... , there are no clear guidelines for deciding what method is most appropriate, this is made even more ... difficult by the fact that most survey methods assume the population is fixed in space, relative to the ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I (Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I) : 301–309 : Autor(es): Macaulay, M.C.
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Distribution and population structure of Dissostichus eleginoides and D. mawsoni on BANZARE Bank (CCAMLR Division 58.4.3b), Indian Ocean.
proportion to abundance, suggesting that no substantial recruitment takes place on BANZARE Bank and the ... BANZARE Bank (CCAMLR Division 58.4.3b), Indian Ocean. Abstract / Description: The distribution, size ... investigated using biological data collected by a Japanese commercial fishing vessel during the austral summer ... shallower banks (<1 000 m), while D. mawsoni was caught on deeper slopes (>1 500 m). Separation of the ... commercial vessel, the FV Shinsei Maru No. 3, has been operating a longline explor- atory fishery for ... Toothfish are the largest nototheniid species in the Southern Ocean, with two species having a cir ... seamounts, between 50 and 60°S, and on the Patagonian Shelf and the southern coast of Chile to 30°S ... Gakuin University 2600 Aihara-cho, Machida Tokyo 194-0292, Japan Abstract The distribution, size ...
Science Journal Paper : CCAMLR Science, Volume 18 (CCAMLR Science, Volume 18) : 145–153 : Autor(es): Taki, K., M. Kiyota, T. Ichii and T. Iwami
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Marine mammals and demersal longline fishery interactions in Crozet and Kerguelen Exclusive Economic Zones: an assessment of depredation levels
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 ... longlines set. In the Kerguelen EEZ, the reported interactions involved sperm whales and fur seals. These ... . Initially, no data on the arrival and/or departure time of marine mammals from the line-hauling site were ... for the differ- ent fi shing sectors when no marine mammals were detected interacting with the fi ... shing operations. No signifi cant effect and no discernable trend in CPUE could be detected in the ... mammals were present, fur seals had no signifi - cant negative effect on CPUE. But in three of the cases ...
Science Journal Paper : CCAMLR Science, Volume 14 (CCAMLR Science, Volume 14) : 67–82 : Autor(es): Roche, C., C. Guinet, N. Gasco and G. Duhamel