Search results
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Simulation of recovery rates of fish stocks in the South Georgia and Kerguelen Islands areas
of important fish stocks. While annual recruitment is the primary factor affecting recovery, the age of first ... recruitment is the primary factor affecting recovery, the age of first recruitment is also an important ... rates from the VPA for each year. The mortality rates of each age within a year were scaled from ... the age of maximum mortality rate within that year to the lowest age of fish caught. The estimated ... fishing mortality at age was rather variable from year to year. The age of first recruitment was chosen ... from the VPA data was also used for the survey analysis of one year's data. 3. Simulation Model ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/4 (Selected Scientific Papers, SC-CAMLR-SSP/4) : 229-298 : Author(s): Hennemuth, R.C., K.D. Bisack and G. Duhamel
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Status of the krill stock around Elephant Island in 1991/92 and 1992/93
the austral summers of 1991/92 and 1992/93 are described and compared with information from previous years ... distributions and maturity stage composition reflected relatively good year class success from the 1990/91 ... spawning season but poor success from 1991/92. Year class success from these and other years appears ... salp concentrations during 1992/93 and 1989/90. File: 02loeb-siegel.pdf ... % of the total (Figure 11). These subadults (2+ age class) represent last year's successful juvenile age class ... to the absence of the small juvenile (l+) age class and the unimodal distribution. Only two clusters were ... H ~ ~ K O H O M ~ P H O C T M pacnpeAeneHux Kpmx B p a i o ~ e o - ~ a 3 n e Q a ~ ~ BO BpeMR IoXHOrO neTa 1991192 H l992193 r . On ... i n o n o ~ o 3 p e n o c ~ ~ KpHnx cornacyeTcs c npeAbIAywuMH onHcaaHsMa H npeAcTasnseTcs noBTopaIoquMcs ...
Science Journal Paper : CCAMLR Science, Volume 1 (CCAMLR Science, Volume 1) : 7–33 : Author(s): Loeb, V. and V. Siegel
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A quantified Bayesian Maximum Entropy estimate of Antarctic krill abundance across the Scotia Sea and in small-scale management units from the CCAMLR-2000 Survey
decreases as one moves away from the completely smooth image) and the like- lihood (which increases ... And in sMAll-scAle MAnAgeMent units froM the ccAMlr-2000 survey B.G. Heywood and A.S. Brierley Pelagic ... are becoming Bayesians). This paper presents just one relatively non-mathematical argument for the use ... , prob(h), needs to be assigned. This specifies one’s original ideas, without the data, about ...
Science Journal Paper : CCAMLR Science, Volume 13 (CCAMLR Science, Volume 13) : 97–116 : Author(s): Heywood, B.G., A.S. Brierley and S.F. Gull
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Age, growth and size at sexual maturity of Macrourus carinatus caught as by-catch in Australian sub-Antarctic trawl fisheries
and McDonald Islands (Division 58.5.2) in 1992 and 1993. The range of estimated ages was 4 to 25 years ... of estimated ages was 4 to 25 years. There were no significant differences in growth parameters calculated ... Paper Title: Age, growth and size at sexual maturity of Macrourus carinatus caught as by-catch ... in Australian sub-Antarctic trawl fisheries Abstract / Description: Estimates of age and growth were obtained ... % were within one year of each other and 92% were aged within two years of each other. The bias ... whitsoni from the Ross Sea. 0 100 200 300 400 500 600 700 0 5 10 15 20 25 30 Age (years) To ta ... . The range of estimated ages was 4 to 25 years. There were no signifi cant differences in growth parameters ... otolith (estimated age: 14 years) viewed using transmitted light. The ageing transect illustrates ...
Science Journal Paper : CCAMLR Science, Volume 10 (CCAMLR Science, Volume 10) : 139–151 : Author(s): van Wijk, E.M., R. Williams and A.J. Constable
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Fitting Euphausia superba into Southern Ocean food-web models: a review of data sources and their limitations
(sustained sampling in one place and wide area and time coverage) and via predators (long time series ... , or from one region to another. File: Atkinson-krill.pdf ... , time series, biomass and swarm-scale information), the fishery (sustained sampling in one place ... to schooling krill, or from one region to another. ... , and regularly with an estimated ~20% of the stock deeper than 200 m at any one time. The fourth undersampled ... Sea, there appear to be two ‘populations’ of krill, one in the ACC and another in the East Wind ... the 80–150°E (Indian) sector there is a positive rela- tionship between krill abundance and the aver- age ... -scale information), the fishery (sustained sampling in one place and wide area and time coverage ...
Science Journal Paper : CCAMLR Science, Volume 19 (CCAMLR Science, Volume 19) : 219–245 : Author(s): A. Atkinson, S. Nicol, S. Kawaguchi, E. Pakhomov, L. Quetin, R. Ross, S. Hill, C. Reiss, V. Siegel, G. Tarling (submitted to the 2008 Joint CCAMLR-IWC Workshop)
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Is the attempt to estimate the biomass of Antarctic fish from a multi-species survey appropriate for all targeted species? Notothenia rossii in the Atlantic Ocean sector – revisited
was one of the first conservation measures adopted by CCAMLR. Fish biomass within a CCAMLR subarea or part ... was one of the first conservation measures adopted by CCAMLR. Fish biomass within a CCAMLR subarea or part ... of the species have been small (<50 kg/ 30 min) with the exception of one or two hauls yielding 500–1 000 kg/30 ... obtained for N. rossii have in general been low. Due to one or two large catches, 95% CVs often exceeded ... in the same localities and were stable over a number of years. At South Georgia, one concentration ... , Hobart, Australia: 30 pp. Barrera-Oro, E.R. and R.J. Casaux. 1992. Age deter- mination of juvenile ...
Science Journal Paper : CCAMLR Science, Volume 11 (CCAMLR Science, Volume 11) : 141–153 : Author(s): Kock, K.-H., M. Belchier and C.D. Jones
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Seabird mortality in the Patagonian toothfish longline fishery around Crozet and Kerguelen Islands, 2001–2003
petrels is explained by the time of year, geographical area and type of longliner (manual versus automatic ... of the mortality of white-chinned petrels and grey petrels is explained by the time of year, geographical area ... of one, two or three streamer lines attached at the stern. Details on the design of the streamer line ... fi shing vessels, with one of the vessels taking nearly half of all incidental by-catch. Nearly 80 ... heavily than the automatically baited ones. The vessels set longlines with several thousand hooks (mean ... hooks per longline) and can set several longlines during one night. Fourteen observers were employed ...
Science Journal Paper : CCAMLR Science, Volume 12 (CCAMLR Science, Volume 12) : 53–80 : Author(s): Delord, K., N. Gasco, H. Weimerskirch, C. Barbraud and T. Micol
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Results of a longline survey on seamounts in the southeast Atlantic and in Subarea 48.6 and Division 58.4.4
, of which D. eleginoides comprised 20.502 tonnes (96%). The seamounts differed substantially in relation ... . The sex ratio of immature D. eleginoides less than 90 cm total length did not significantly vary from ... 1:1. Females accounted for 70% of individuals of more than 90 cm in total length. The stratum with the highest ... comprised 20.502 tonnes (96%). The seamounts differed substantially in relation to seabed topography ... strate ou l'on a realise la plus grande capture (en poids) par unit6 d'effort est celle des 600 B 800 ... between 670 and 1 400 m; below this depth, the slope fell away sharply making sampling impractical. Only ... one set was made between 700 and 1 200 m on the abrupt slope of the Bouvet Island area. Ob and Lena ... females (2%) were at stage 5 and one at stage 3 (developing). These results indicated that spawning had ...
Science Journal Paper : CCAMLR Science, Volume 6 (CCAMLR Science, Volume 6) : 99–116 : Author(s): López Abellán, L.J. and J.F. González Jiménez
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A composite recruitment index to describe interannual changes in the population structure of Antarctic krill at South Georgia
differences, due in part to bias arising from a large number of krill in just one of the station net hauls ... of krill in just one of the station net hauls. Therefore, when the number of station net hauls is limited ... recruitment year due to krill spawned in 1994/95. File: 06watkins.pdf ... in the population increased with a very successful recruitment year due to krill spawned in 1994/95. ... rt20prHM B 0 BpeMX 7 pefico~, IIpOBeAeHHblX C 1989 no 1998 r. 1994 r . KOnH~eCTBO KPMJlR rOn ... to 1993/94. There was generally a good separation between the l + and 2+ krill sizes in any one year ... differences, due in part to bias arising from a large number of krill in just one of the station net hauls ... MHAeKC nOnOJlHeHMR OCHOBBH Ha QaHHblX n0 nAOTHOCTH, IIOAyYeHHblX no aKYCTMYeCKllM CXeMKaM, H Ha AaHHbIX ...
Science Journal Paper : CCAMLR Science, Volume 6 (CCAMLR Science, Volume 6) : 71–84 : Author(s): Watkins, J.L
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Timing of clutch initiation in Pygoscelis penguins on the Antarctic Peninsula: towards an improved understanding of off-peak census correction factors
two components. One is a model to estimate the date of peak egg laying for a given site in a given ... , in that the number of sites surveyed comes at the expense of the timing of surveys at any one loca- tion ... of censuses that must be accounted for along with other, more typical, sources of error. One ... of the challenges associated with such an approach to penguin population research, one also shared with much ... Paper Title: Timing of clutch initiation in Pygoscelis penguins on the Antarctic Peninsula ... censuses on the Antarctic Peninsula are often subject to logistical challenges that preclude nest counts ...
Science Journal Paper : CCAMLR Science, Volume 16 (CCAMLR Science, Volume 16) : 149–165 : Author(s): Lynch, H.J., W.F. Fagan, R. Naveen, S.G. Trivelpiece and W.Z. Trivelpiece