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Results of fish larvae sampling by means of fine-meshed samplers attached to a bottom trawl
postlarval fish was highest in the shallow (108-166 m), nearshore waters of the north eastern shelf of South ... bottom trawl Abstract / Description: Fine-meshed samplers were attached to the top of a bottom trawl in ... order to provide information on the composition, distribution and abundance of Antarctic fish larvae in ... sized meshes for sampling larvae in the bottom zone and the resistance of the samplers to damage during ... -meshed samplers were attached to the top of a bottom trawl in order to provide information on the ... composition, distribution and abundance of Antarctic fish larvae in the near-bottom zone, which is usually ... not sampled using plankton nets. The efficiency of various sized meshes for sampling larvae in the ... nets were more effective in sampling when attached to the top of the trawl belly, not to the codend. A ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/5 – Part II (Selected Scientific Papers, SC-CAMLR-SSP/5 – Part II) : 69-86 : Autor(es): Ślósarczyk, W. and I. Wójcik
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Status of the Polish FIBEX acoustic data from the West Atlantic
/ Description: Acoustic data from the Polish FIBEX survey in the West Atlantic were analysed using recent ... densities of krill in the oceanic parts of the Drake Passage were low (3 g m-2); however, the results also ... in the Bransfield Strait. These results are discussed in the context of spatial and seasonal ... , Madingley Road Cambridge CB3 OET, United Kingdom Abstract Acoustic data from the Polish FIBEX survey in ... , 1991a). This analysis indicated that the acoustic densities of hi l l in the oceanic parts of the ... density. High acoustic densities of krill(77 g m-') were also present in the Bransfield Strait. These ... results are discussed in the context of spatial and seasonal variation which has previously been reported ...
Science Journal Paper : CCAMLR Science, Volume 6 (CCAMLR Science, Volume 6) : 125–132 : Autor(es): Trathan, P.N., J. Kalinowski and I. Everson
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A preliminary investigation of the possible effects of rhizocephalan parasitism on the management of the crab fishery around South Georgia
levels of infection by a rhizocephalan barnacle have been found in the population of the crab Paralomis ... to declines in spawning stock. The effects of harvesting both healthy and infected animals are ... animals from the population. The need is stronger when the population is sensitive to declines in spawning ... stock. Results highlight the importance of incorporating parasitism in the design of a management ... INTRODUCTION The first fishing trip targeting crabs in Subarea 48.3, by the FV Pro Surveyor, presented in ... where the externa have been lost (Sloan, 1984). This suggests that, at least in some cases, the ... Relatively high levels of infection by a rhizocephalan barnacle have been found in the population of the ... : (i) resilience; and (ii) sensitivity to declines in spawning stock. The effects of harvesting both ...
Science Journal Paper : CCAMLR Science, Volume 1 (CCAMLR Science, Volume 1) : 175–192 : Autor(es): Basson, M
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Management and assessment options for the crab fishery around South Georgia
/ Description: A new fishery for the lithodid crab, Paralomis spinosissima, started in Subarea 48.3 in 1992 ... . The fishery is also new to CCAMLR, both in terms of the species and fishing gear. We provide an ... overview of the management options for crab fisheries in general and then consider these options in the ... in addition to the 'size-sex-season' controls. Implementation of both sets of controls ... spinosissima, started in Subarea 48.3 in 1992. The fishery is also new to CCAMLR, both in terms of the species ... and fishing gear. We provide an overview of the management options for crab fisheries in general and ... then consider these options in the context of this crab fishery with specific reference to the ... catch/effort controls in addition to the 'size-sex-season' controls. Implementation of both sets of ...
Science Journal Paper : CCAMLR Science, Volume 1 (CCAMLR Science, Volume 1) : 193–202 : Autor(es): Basson, M. and D.D. Hoggarth
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A balanced model of the food web of the Ross Sea, Antarctica
model has 38 trophic groups and is balanced in terms of annual flows of organic carbon in an average ... recent year (1990–2000). The focus of the model is on the role of Antarctic toothfish in the food web ... ) in trophic flows between groups. Parameters for biomass, production rate, growth efficiency, diet ... changes in biomass, production/biomass and production/consumption parameters were needed to balance the ... distinguished between in this model as the primary concern of this study is middle and upper TL groups. The ... consistency. The model has 38 trophic groups and is balanced in terms of annual flows of organic carbon in an ... average recent year (1990–2000). The focus of the model is on the role of Antarctic toothfish in the food ... magnitude) in trophic flows between groups. Parameters for biomass, production rate, growth efficiency ...
Science Journal Paper : CCAMLR Science, Volume 17 (CCAMLR Science, Volume 17) : 1–31 : Autor(es): Pinkerton, M.H., J.M. Bradford-Grieve and S.M. Hanchet
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Analyses of acoustic line-transect data from the waters around South Georgia: estimation of krill (Euphausia superba Dana) – biomass
of zooplankton stocks in the waters around South Georgia was carried out during November and December ... 1981. The data have been analysed using various definitions of strata. The total biomass in the area of ... (Figure 3). 18 transects Each of the nine long transects split in the middle (Figure 4). 6 strata Each ... . Murphy, I. Everson and A. Murray*· Abstract A large-scale acoustic survey of zooplankton stocks in ... been analysed using various definitions of strata. The total biomass in the area of 155 786 km2 was ... . INTRODUCTION Acoustic surveys have become a standard technique in the study of the distribution and ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/8 (Selected Scientific Papers, SC-CAMLR-SSP/8) : 225–243 : Autor(es): Murphy, E., I. Everson and A. Murray
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An overview of Southern Ocean zooplankton data: abundance, biomass, feeding and functional relationships (submitted to the 2008 Joint CCAMLR-IWC Workshop)
between the Antarctic sectors, but latitudinally it is maximal in the Polar Frontal Zone and declines to ... for differences in the extent of identification of early larval stages. Likewise, the time of year ... in size structure and abundance. Other issues are specific to polar environments, for example, lipid ... in global literature compilations. Likewise, stenothermy (narrow temperature tolerance) means that ... Antarctic sectors, but latitudinally it is maximal in the Polar Frontal Zone and declines to the north and ... south. Those compiling data on numerical density (no. m–2 or no. m–3) need to allow for differences in ... seasonal vertical migrations and their pulsed reproduction causes great seasonal changes in size structure ... leads to significantly different length-mass and mass-rate relationships than are reported in global ...
Science Journal Paper : CCAMLR Science, Volume 19 (CCAMLR Science, Volume 19) : 171–218 : Autor(es): A. Atkinson, P. Ward, B.P.V. Hunt, E.A. Pakhomov and G.W. Hosie
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Performance and geometry of the FP-120 trawl used during UK fish stock assessment surveys around South Georgia, Subarea 48.3
opening (and, thus, swept area) of a bottom trawl are discussed. In situ measurements of the FP-120 trawl ... compared to values obtained from a previous equation. The resulting difference in biomass estimates is of ... in 1992, the mini-transponder was lost on the first trawl on which it was deployed. Additionally ... using a single transducer mounted in the middle of the headline during the tow. This measurement can ... , swept area) of a bottom trawl are discussed. In situ measurements of the FP-120 trawl used during the ... compared to values obtained from a previous equation. The resulting difference in biomass estimates is of ...
Science Journal Paper : CCAMLR Science, Volume 2 (CCAMLR Science, Volume 2) : 51–69 : Autor(es): Pilling, G. and G. Parkes
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CCAMLR ecosystem monitoring and management: future work
: Harvesting of marine living resources in the Southern Ocean is managed by the Commission for the Conservation ... managing fisheries with the maintenance of ecological relationships included in the conservation objectives ... . In the late 1980s, CCAMLR’s precautionary approach was developed, incorporating principles of how to ... use scientific evidence in the decision-making process. Even though this approach was based on the ... @antdiv.gov.au Abstract Harvesting of marine living resources in the Southern Ocean is managed by the ... included in the conservation objectives. In the late 1980s, CCAMLR’s precautionary approach was developed ... , incorporating principles of how to use scientifi c evidence in the decision-making process. Even though this ... account of the needs of predators in the assessment of catch limits. The success of this process is due ...
Science Journal Paper : CCAMLR Science, Volume 9 (CCAMLR Science, Volume 9) : 233–253 : Autor(es): Constable, A.J
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Improving estimates of Adélie penguin breeding population size: developing factors to adjust one-off population counts for availability bias
presented for the collection and development of data to adjust counts of Adélie penguins made at any time in ... point one week after the peak in egg laying, consistent with Standard Method A3 of the CCAMLR Ecosystem ... illustrated using data collected at the Béchervaise Island CEMP site in 2007/08. Estimates of the breeding ... , breeding-age penguins that failed to return to the breeding site in that breeding season, nor pre-breeding ... adjustment and aggregation of multi- ple one-off counts from Eastern Antarctica. In that work, site-specific ... at any time in the breeding season to an estimate of the breeding population. The development of ... reference point one week after the peak in egg laying, consistent with Standard Method A3 of the CCAMLR ... method is illustrated using data collected at the Béchervaise Island CEMP site in 2007/08. Estimates of ...
Science Journal Paper : CCAMLR Science, Volume 17 (CCAMLR Science, Volume 17) : 229–241 : Autor(es): Southwell, C., J. McKinlay, L. Emmerson, R. Trebilco and K. Newbery