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Modelling krill recruitment
Paper Title: Modelling krill recruitment Abstract / Description: A method is developed for using ... observed values of the mean proportion of recruits and its variance to model recruitment in a krill ... other parameters consistent with the observed proportional recruitment parameters. A procedure is given ... , Australia Abstract A method is developed for using observed values of the mean proportion of recruits ... and its variance to model recruitment in a krill population in terms of numbers of recruits. The ... proportional recruitment parameters. A procedure is given for generating families of recruitment functions ... , population, modelling, recruitment, mortality, CCAMLR INTRODUCTION In a paper published in this volume ...
Science Journal Paper : CCAMLR Science, Volume 1 (CCAMLR Science, Volume 1) : 49–54 : Autor(es): W.K. de la Mare
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Preliminary appraisal of Antarctic fish selection by the 32/36 bottom trawl combined with various codends
codends (mesh size 120 mm) and single-layer tape codends with a mesh size of 60 and 100 mm were determined ... , especially Scotia Sea icefish and South Georgia icefish the determination of a proper mesh size of trawls ... used in fishing for them requires further research. It should first of all cover twine codends with a ... mesh size of 80 mm, currently used on factory trawlers, as well as codends with a structure resembling ... -layer tape codends with a mesh size of 60 and 100 mm were determined. It was found that the ... Sea icefish and South Georgia icefish the determination of a proper mesh size of trawls used in ... fishing for them requires further research. It should first of all cover twine codends with a mesh size ... of 80 mm, currently used on factory trawlers, as well as codends with a structure resembling tape ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/4 (Selected Scientific Papers, SC-CAMLR-SSP/4) : 1-48 : Autor(es): Zaucha, J.
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Catch per unit effort (CPUE) data from the early years of commercail krill fishing operations in the Atlantic sector of the Antarctic
years on a subarea and area basis, and between oceanic and shelf regions. Results show that the CPUE may ... differ between subareas, years and shelf/oceanic regions. Obviously, a consistent pattern of CPUE values ... the circumstances, a commercial CPUE index may seriously under- or overestimate the amount of krill ... available in a statistical subarea. Overall length-frequency distributions from commercial fishing ... subareas in single years, between years on a subarea and area basis, and between oceanic and shelf regions ... . Results show that the CPUE may differ between subareas, years and shelf/oceanic regions. Obviously, a ... is expressed in this regard. Depending on the circumstances, a commercial CPUE index may seriously ... under- or overestimate the amount of krill available in a statistical subarea. Overall length-frequency ...
Science Journal Paper : CCAMLR Science, Volume 5 (CCAMLR Science, Volume 5) : 31–50 : Autor(es): Siegel, V., V. Sushin and U. Damm
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Experimental evaluation of the effectiveness of weighting regimes in reducing seabird by-catch in the longline toothfish fishery around South Georgia
seabird by-catch in the longline toothfish fishery around South Georgia Abstract / Description: A series ... attached at 40 m intervals on a Spanish-rigged longline. There was a significant reduction in bird ... regimes. The importance of a good design in experiments of this type is emphasised, because even though ... Abstract A series of experiments was carried out in February 1999 at South Georgia (Subarea 48.3) to ... and 12.75 kg attached at 40 m intervals on a Spanish- rigged longline. There was a significant ... effective line-weighting regimes. The importance of a good design in experiments of this type is emphasised ... . Resume Une serie d'experiences menees en fevrier 1999 en Georgie du Sud (sous-zone 48.3) a permis ...
Science Journal Paper : CCAMLR Science, Volume 7 (CCAMLR Science, Volume 7) : 119–131 : Autor(es): Agnew, D.J., A.D. Black, J.P. Croxall and G.B. Parkes
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Quantification of Southern Ocean phytoplankton biomass and primary productivity via satellite observations and biogeochemical models (submitted to the 2008 Joint CCAMLR-IWC Workshop)
regard to their use in the Southern Ocean. A brief history of algorithms linking ocean colour to primary ... regional approaches. Using monthly climatologies of SeaWiFS chlorophyll, a phenology of phytoplankton ... regarding phytoplankton species composition and succession is summarised. A review of ecosystem and ... biogeochemical models for the Southern Ocean is presented, with a focus on those models that have been validated ... oceanic reservoir. The Southern Ocean (here mostly defined as south of 50°S) is a vast province with ... use in the Southern Ocean. A brief history of al- gorithms linking ocean colour to primary ... regional approaches. Using monthly climatologies of SeaWiFS chlorophyll, a phenology of phytoplankton ... regarding phytoplankton species composition and succession is summarised. A review of ecosystem and ...
Science Journal Paper : CCAMLR Science, Volume 19 (CCAMLR Science, Volume 19) : 247–265 : Autor(es): P.G. Strutton, N.S. Lovenduski, M. Mongin and R. Matear
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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 ... for a conservative approach to management. Such an approach includes the use of catch/effort controls ... design. One of the main aims in designing a management plan is to allow the fishery to develop at a rate ... Prince's Gardens London SW7 INA, UK Abstract A new fishery for the lithodid crab, Paralomis ... Convention point to the need for a conservative approach to management. Such an approach includes the use of ... given to their design. One of the main aims in designing a management plan is to allow the fishery to ... develop at a rate compatible with the expansion of the information base available for assessment ...
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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Can toothfish catches be used to predict the presence of vulnerable benthic invertebrate taxa?
rates and benthic invertebrate catch rates at the scale of a longline segment, ~1 200 m. Analysis of the ... predicting Antarctic toothfish (Dissostichus mawsoni) catch at the scale of a longline segment. This supports ... catch at the scale of a longline set, ~7 km. Further studies at intermediate scales (10–100 km) would be ... distributions, showing a high degree of spatial overlap with the fishery. File: 06parker-smith.pdf ... to correlate toothfish catch rates and benthic invertebrate catch rates at the scale of a longline ... of a longline segment. This supports conclusions of previous work finding no relationship between ... aggregate VME indicator taxa weight and toothfish catch at the scale of a longline set, ~7 km. Further ... VME indicator taxa have regionally concentrated distributions, showing a high degree of spatial ...
Science Journal Paper : CCAMLR Science, Volume 18 (CCAMLR Science, Volume 18) : 87–96 : Autor(es): Parker, S.J. and M.H. Smith
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Discrimination of Macrourus whitsoni and M. caml (Gadiformes, Macrouridae) using otolith morphometrics
, was recognised in 2010 with the identification of a new species, M. caml. Grenadier are the main by ... -frequency and relative importance of grenadiers as prey to toothfish, a method of distinguishing between ... otoliths of the two species was sought. Based on 220 M. whitsoni and 307 M. caml otoliths, a linear ... excellent discrimination between the two species (92% success). A method was also developed to discriminate ... (CCAMLR Subareas 88.1 and 88.2) (Stevenson et al., 2014). A by-catch of 10 tonnes of grenadiers was ... (Stevenson et al., 2014). Grenadiers are also a major prey species of Ant- arctic toothfish in the region ... potential for a ‘predation release’ of grenadiers as the number of toothfish reduces due to fishing ... Year Census of Antarctic Marine Life (IPY- CAML) voyage in 2008 led to the identification of a new ...
Science Journal Paper : CCAMLR Science, Volume 22 (CCAMLR Science, Volume 22) : 15–28 : Autor(es): Pinkerton, M.H., C. Ó Maolagáin, J. Forman and P. Marriott
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Modelling and decision making as part of the CCAMLR management regime
/ Description: This paper outlines a stylised scheme designed to address the multi-objective decision ... horizons, time steps, constraints and data) were identified in an attempt to provide a blueprint for the ... formulation of a suitable decision-making protocol for management purposes. File: 16-Miller.pdf ... outlines a stylised scheme designed to address the multi-objective decision environment essential for the ... data) were identified in an attempt to provide a blueprint for the development of suitable ... simulations of important Antarctic marine ecosystem interactions and to facilitate the formulation of a ... prise de decisions a objectifs multiples necessaire aI' amenagement efficace de l' ecosysteme marin de ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/3 (Selected Scientific Papers, SC-CAMLR-SSP/3) : 295-322 : Autor(es): Miller, D.G.M.
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CCAMLR ecosystem monitoring and management: future work
management of a single species (Antarctic krill, Euphausia superba), it takes account of the needs of ... predators in the assessment of catch limits. The success of this process is due to the formulation of a ... up to detect the effects of fishing on krill predators. CCAMLR needs to adopt a management procedure ... which has a good chance of maintaining ecological relationships and meeting the needs of predators ... approach was based on the management of a single species (Antarctic krill, Euphausia superba), it takes ... to the formulation of a management procedure which includes decision rules that specify how harvest ... adopt a management procedure which has a good chance of maintaining ecological relationships and ... fi shery for designing a monitoring program to detect the effects of fi shing, and the types of ...
Science Journal Paper : CCAMLR Science, Volume 9 (CCAMLR Science, Volume 9) : 233–253 : Autor(es): Constable, A.J