Search results
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Variations in condition indices of mackerel icefish at South Georgia from 1972 to 1997
of applying an ecosystesn approacl~ to management as required by the Convention for the Conservation ... months prior to spawning. Depending on locality, that will mean that except for the months of March ... little influence on the variation in C, through most of the year. Annual Variation The mean indices ... in Figure 4. The mean values fluctuate although not in an apparently regular manner. Periods during which ... of considerable value in interpreting the results from ecosystein assessments such as that in ... Paper Title: Variations in condition indices of mackerel icefish at South Georgia from 1972 to ... predominantly on krill. An index of condition which uses the ratio of the measured total mass to the estimated ... mass is shown to provide a good indicator of local krill density. The index is likely to be little ...
Science Journal Paper : CCAMLR Science, Volume 8 (CCAMLR Science, Volume 8) : 119–132 : Author(s): Everson, I. and K.-H. Kock
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Protecting young fish and spawning aggregations of Champsocephalus gunnari in Subarea 48.3 (South Georgia): a review
of conservation measures for the C. gunnavi fishery in Subarea 48.3 whch, whether specifically intended ... to 4 036 tonnes by a CCAMLR conservation measure (Conservation Measure 175/XVIII; CCAMLR, 1999 ... during the open season by investing in more efficient vessels and equipment. CCAMLR CONSERVATION ... introduced a variety of conservation measures intended to protect young fish, including gear restrictions ... measures put in place by CCAMLR to date. These measures are re-examined in the light of new information ... , and a strategy for the future protection of young fish and spawning aggregations of C. gunnari in ... Paper Title: Protecting young fish and spawning aggregations of Champsocephalus gunnari in ... spawning aggregations in fisheries generally, and specifically in the Champsocephalus gunnari fishery in ...
Science Journal Paper : CCAMLR Science, Volume 7 (CCAMLR Science, Volume 7) : 75–86 : Author(s): Parkes, G.B
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Midwater trawl catchability in relation to krill and possible ways of assessing gross catch
6blJ111 BbInOJ1HeHbl no ,llaHHbIM aKcne,llI1~I1H ATJ1aHTIlliPO 3a nep"o,ll 1983-1990 rr. B Mope ... aumentarla. 1. IN1RODUCTION Krill is an important element in the Antarctic ecosystem. The rational ... development of the kriU fishery hinges on the conservation of the Antarctic marine ecosystem and presupposes ... components in solving many problems associated with the krill fishery. The term "gross catch" means ... the basis of data obtained from AtlantNIRO expeditions from 1983 to 1990 in the Scotia Sea. A ... Paper Title: Midwater trawl catchability in relation to krill and possible ways of assessing ... 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 ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 87–113 : Author(s): Zimarev, Yu.V., S.M. Kasatkina and Yu.P. Frolov
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Mitigation of seabird captures during hauling in CCAMLR longline fisheries
) and has been a major contributory factor to their unfavourable conservation status. The success ... to the amendment of CCAMLR’s Conservation Measure 29/XII (Minimisation of the Incidental Mortality of Seabirds ... of different haul mitigation and an assessment of the effectiveness of those measures by means of detailed ... to make any meaningful comparison with the other designs. Nevertheless, no seabirds have been captured ... Paper Title: Mitigation of seabird captures during hauling in CCAMLR longline fisheries Abstract ... as 1994/95 when steps were taken to reduce the attraction of seabirds to vessels during the hauling ... process. Since 2003, increased efforts have been made to improve the design and performance of bird ... these two key functional characteristics into the specification of a BED to be deployed by longline ...
Science Journal Paper : CCAMLR Science, Volume 17 (CCAMLR Science, Volume 17) : 155–162 : Author(s): Reid, E., B. Sullivan and J. Clark
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Marine mammals and demersal longline fishery interactions in Crozet and Kerguelen Exclusive Economic Zones: an assessment of depredation levels
and marine mammal conservation. Losses due to depredation are in fact not usually accounted for in fi sh ... the mean CPUE in different combina- tions of marine mammal species observed within each of the fi shing ... EEZ The mean numbers of killer whales, sperm whales and fur seals observed in longline fi sh- ery ... sectors (Table 2) and, when present, were responsi- ble for a mean decrease in CPUE of 12 ± 23% and 21 ... whales. These two species, alone or in co-occurrence with each other, were observed in 71% of the 1 308 ... two species, alone or in co-occurrence with each other, were observed in 54% of the 6 262 longlines ... monitored. Interactions were observed in all fishing areas. The effect of depredation was assessed by ... comparing catch-per-unit-effort (CPUE) (fish/weight/hook) of each longline set in the absence/presence of ...
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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Age, growth and size at sexual maturity of Macrourus carinatus caught as by-catch in Australian sub-Antarctic trawl fisheries
on the Conservation of Antarctic Marine Living Resources (CCAMLR). In some areas the macrourid by-catch comprises ... . This relatively high level of precision was also indicated by a bias corrected bootstrap mean IAPE = 2.6% (CI ... corrected bootstrap mean IAPE = 4.6% (CI = 3.2–6.0%), indicating a greater discrepancy between readers ... no signifi cant departure of the mean lengths at age from the fi tted von Bertalanffy curve ... McDonald Islands (Division 58.5.2) in 1992 and 1993. The range of estimated ages was 4 to 25 years. There ... Paper Title: Age, growth and size at sexual maturity of Macrourus carinatus caught as by-catch in ... operations in the Heard Island region in 2000. The length at first maturity (L 50) was 418 mm (total length ... Australian sub-Antarctic trawl fisheries Abstract / Description: Estimates of age and growth were obtained ...
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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A study of Patagonian toothfish (Dissostichus eleginoides) post-tagging survivorship in Subarea 48.3
survivorship of 95% or more. An assumption of 90% post-tagging survivorship is a conservative value which might ... . An assumption of 90% post-tagging survivorship is a conservative value which might be appropriate to use ... -tagging survivorship is a conservative value which might be appropriate to use in population estimators ... . Details of the tanks and number of fish exam- ined is provided in Table 1. All vessels were long- liners ... survivorship is a conservative value which might be appropriate to use in population estimators until further ...
Science Journal Paper : CCAMLR Science, Volume 13 (CCAMLR Science, Volume 13) : 279–289 : Author(s): Agnew, D.J., J. Moir Clark, P.A. McCarthy, M. Unwin, M. Ward, L. Jones, G. Breedt, S. Du Plessis, J. Van Heerdon and G. Moreno
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Trends in population size and breeding success at colonies of macaroni and rockhopper penguins, Marion Island, 1979/80–1995/96
of those eggs that hatched (chick survival) the mean numbers of eggs hatched and chicks fledged per ... River were not significantly correlated to those at the other colonies (Table 1). The mean number ... Boogaard River in 1989/90) and 0.83 at Archway Bay in 1985/86 (Figure 3). The overall mean number ... % at Macaroni Bay in 1989/90. The overall mean value for chick survival was 72% (n = 4 312). Trends in chick ... . The only significant relationship between inter-season trends in the number of pairs breeding at the ... period, while the other remained stable. Trends in the number of pairs breeding at the three rockhopper ... of macaroni penguins were significantly correlated in all three inter-colony comparisons over the ... were significantly correlated in only one of the three inter-colony comparisons. The greater coherence ...
Science Journal Paper : CCAMLR Science, Volume 4 (CCAMLR Science, Volume 4) : 89–103 : Author(s): Cooper, J., A.C. Wolfaardt and R.J.M. Crawford
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Results of E.L. Holmberg 1997 fish survey in Subarea 48.3
in the previous cruises. Mean densities were obtained considering the spatial aggregation of stations in a nested ... ANOVA model. No significant changes in the mean densities of several species, including Champsocephalus ... in the previous cruises. Mean densities were obtained considering the spatial aggregation of stations in a nested ... ANOVA model. No significant changes in the mean densities of several species, including Champsocephalus ...
Meeting Document : WG-FSA-97/47 : Author(s): Prenski, B., Calcagno, J., Marschoff, E.R., Gonzalez, B.
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Preliminary model of krill fishery behaviour in Subarea 48.1
~ ~ H B M H ~ C T O H H 3JIeaaHT B YepeAyWqHeCR TOAbI, IIpMBeAeT K CpeAHeMy roAoBOMy BbIn ... OBy, K O T O P ~ I ~ ~ 6 y ~ e T aHanormeH cospeMeHHoMy. T ~ M He MeHee, B TOM cnyqae B TerIeHMe YepeAymwHxcrr neT BbIn ... distributed and accordingly er,, was sampled from a log-normal distribution with mean ln(cpue),, taken from ... Table 1. However, since sample sizes in Table 1 varied considerably, an approximate mean CV of 0.4 ... : A simple model of the behaviour of the krill fishery in FAO Statistical Subarea 48.1 (South Shetland ... catches in the subarea. A number of management scenarios are considered which involve the closure of (i) a ... . However, in this scenario, the catch would be more concentrated in foraging areas of land-based predators ... Paper Title: Preliminary model of krill fishery behaviour in Subarea 48.1 Abstract / Description ...
Science Journal Paper : CCAMLR Science, Volume 1 (CCAMLR Science, Volume 1) : 71–79 : Author(s): Agnew, D.J. and V.H. Marín