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A composite recruitment index to describe interannual changes in the population structure of Antarctic krill at South Georgia
Paper Title: A composite recruitment index to describe interannual changes in the population ... substantial differences, due in part to bias arising from a large number of krill in just one of the station ... net hauls. Therefore, when the number of station net hauls is limited, bias is likely to be reduced if ... target net haul data can be included by using the composite recruitment index. This index is used to ... population structure have been obtained from krill eaten by predators at the western end of South Georgia ... comparisons presented in the rest of the paper. After the length-frequency distributions within an area ... population in the year after spawning, R2 as the pro ortion of 2+ animals in 2+ an$ older in the seconR°F2 ... in offshore waters at the eastern end of the island. The calculation of recruitment indices from ...
Science Journal Paper : CCAMLR Science, Volume 6 (CCAMLR Science, Volume 6) : 71–84 : Autor(es): Watkins, J.L
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Environment–krill relations in the South Georgia marine ecosystem
Paper Title: Environment–krill relations in the South Georgia marine ecosystem Abstract ... / Description: Interannual variability in the Southern Ocean ecosystem has long been noted and physical factors ... appear to dominate the dynamics. There are, however, few ecological time series available to assess this ... variability and it is only recently that physical datasets have been generated for the Southern Ocean. In this ... westerly winds (Figure 5), while the M-AT index decreased after the mid-1970s indicating greater ... fishery consistently operated from late summer through to the end of winter (April-May to September ... -water temperature at the beginning of the year. How does this system affect krill distribution ... RELATIONS IN THE SOUTH GEORGIA MARINE ECOSYSTEM P.P. Fedoulov Atlantic Research Institute of Marine ...
Science Journal Paper : CCAMLR Science, Volume 3 (CCAMLR Science, Volume 3) : 13–30 : Autor(es): Fedoulov, P.P., E. Murphy and K.E. Shulgovsky
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A preliminary assessment of age and growth of Antarctic silverfish (Pleuragramma antarcticum) in the Ross Sea, Antarctica
antarcticum) in the Ross Sea, Antarctica Abstract / Description: Antarctic silverfish (Pleuragramma ... antarcticum) were sampled during a trawl survey in the Ross Sea, Antarctica. Biological data, including fish ... otoliths were used to estimate ages and von Bertalanffy growth parameters. The species is relatively slow ... -growing with a moderate longevity; the maximum estimated age was 14.3 years. Von Bertalanffy parameters ... (1989) concluded that the opaque zone had formed by the end of sum- mer. Consequently, the first opaque ... zone formed about 0.3 years after the birthday, had a radius of only about 0.1 mm, and was often ... about 0.6 mm. Because the fish for the current work were sam- pled at the end of summer, otolith ... subsample of 99 otoliths was reread by the primary reader (CS) six weeks after the ini- tial reading to ...
Science Journal Paper : CCAMLR Science, Volume 18 (CCAMLR Science, Volume 18) : 75–86 : Autor(es): Sutton, C.P. and P.L. Horn
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Results of the CCAMLR Antarctic fish otoliths/scales/bones exchange system
Paper Title: Results of the CCAMLR Antarctic fish otoliths/scales/bones exchange system Abstract ... / Description: An exchange system was established among Members of CCAMLR to compare age determinations for the ... same species among different laboratories. Four species were included in the exchange: Notothenia ... rossii, Champsocephalus gunnari, Notothenia gibberifrons and Pleuragramma antarcticum. The level of ... readers (Figure 8). 4. DISCUSSION Since the beginning of the 1970s, many studies on age and growth of ... gibberifrons from the South Shetland Islands. (Data of reader 5 have not been included due to submission after ... SC-CAM LR-VIIIIBG/46 RESULTS OF THE CCAMLR ANTARCTIC ... established among Members of CCAMLR to compare age determinations for the same species among different ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/6 (Selected Scientific Papers, SC-CAMLR-SSP/6) : 197–226 : Autor(es): Kock, K.-H.
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A review of the effectiveness of streamer lines as a seabird by-catch mitigation technique in longline fisheries and CCAMLR streamer line requirements
Paper Title: A review of the effectiveness of streamer lines as a seabird by-catch mitigation ... large degree on the precedent set by CCAMLR in 1991, the streamer line has become the primary, and most ... light of a review of existing literature and available data on the effectiveness of single and paired ... (or multiple) streamer lines. Research to determine the optimal streamer line design and configuration ... end, literature and available data on the effectiveness of streamer lines in reducing seabird ... device at the end to create tension so that the mainline streams directly behind the ship even in ... is being asked to achieve. The tension created by the towed object at the end of a streamer line ... the end to create tension so that the mainline streams directly behind Distance (m) One streamer ...
Science Journal Paper : CCAMLR Science, Volume 11 (CCAMLR Science, Volume 11) : 189–201 : Autor(es): Melvin, E.F., B. Sullivan, G. Robertson and B. Wienecke
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A statistical method for estimating the level of IUU fishing: application to CCAMLR Subarea 48.3
Paper Title: A statistical method for estimating the level of IUU fishing: application to CCAMLR ... -documented fisheries protection vessel (FPV) cruise data. The method takes explicit account of both ‘seen ... interpreted as zero IUU fishing. For each IUU incident detected by the FPV, a theoretical maximum time over ... to have been observed when the IUU vessel and the FPV vessel were in the same place at the same time ... after the end of the fi rst FPV cruise, but over- laps with the next two FPV cruises. It is missed by ... activity increased considerably at South Georgia, with the result that after detecting a few inci- dents ... basing D on the prior and subsequent FPV cruises, it is effectively assumed that after detection by an ... the area or the planned end of the IUU cruise. Fourthly, and by the same token, it is assumed that ...
Science Journal Paper : CCAMLR Science, Volume 12 (CCAMLR Science, Volume 12) : 119–141 : Autor(es): Agnew, D.J. and G.P. Kirkwood
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Evidence to support the annual formation of growth zones in otoliths of Antarctic toothfish (Dissostichus mawsoni)
Paper Title: Evidence to support the annual formation of growth zones in otoliths of Antarctic ... the Ross Sea (CCAMLR Subarea 88.1) have been aged assuming that one translucent zone is formed ... annually in the otoliths of this species. However, no evidence to validate this assumption has previously ... been presented. In the current work, otoliths from four distinct juvenile length-frequency modes were ... assigned to each year class based on the time elapsed between the estimated end of the spawning season ... year or more after tagging. Otoliths from the recaptured fi sh were embed- ded whole and unbaked in ... otolith in the summer immediately after tagging was poorly formed and not apparent in the photographs ... (2002) recorded some spawning fi sh in May at the end of the 2001/02 fi shing season. Yukhov (1982 ...
Science Journal Paper : CCAMLR Science, Volume 10 (CCAMLR Science, Volume 10) : 125–138 : Autor(es): Horn, P.L., C.P. Sutton and A.L. DeVries
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The choice of procedure for deciding when to close fisheries regulated by CCAMLR: a simulation model
Paper Title: The choice of procedure for deciding when to close fisheries regulated by CCAMLR: a ... simulation model Abstract / Description: The methods, described in CCAMLR Conservation Measures, used for ... deciding the closure date for fisheries monitored by the Secretariat of CCAMLR, have been difficult to ... implement because of the variation in catch rates shown by the fisheries. Non-fluctuating random and ... falling due at the end of the period following that in which catches are taken; • the Secretariat should ... Secretariat was modelled by: where D is the total time from the end of a reporting period to the arrival of ... is Catch rate of most recent The end of the reporting is the model described greater than a ... The end of the reporting ad hoc method by the the period immediately period period within which the ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/9 (Selected Scientific Papers, SC-CAMLR-SSP/9) : 81–97 : Autor(es): Agnew, D.J.
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Fish distribution and biomass in the Heard Island zone (Division 58.5.2)
Paper Title: Fish distribution and biomass in the Heard Island zone (Division 58.5.2) Abstract ... / Description: Division 58.5.2 encompasses the southern part of the Kerguelen plateau, and contains Heard ... Island and the McDonald Islands, an Australian Territory around which a 200-mile EEZ has been declared ... . In order to assess the potential of this area for commercial fishing, and to obtain some preliminary ... Survey End 23 June 1990 13 February 1992 28 September 1993 designated as a separate stratum. The ... . As the spawning season is not until the end of October at Kerguelen (Duhamel and Ozouf-Costaz ... spread of strong younger size classes. By spring 1993, 18 months after summer 1992, the large size ... AND BIOMASS IN THE HEARD ISLAND ZONE (DIVISION 58.5.2) R. Williams and W.K. de la Mare Australian ...
Science Journal Paper : CCAMLR Science, Volume 2 (CCAMLR Science, Volume 2) : 1–20 : Autor(es): Williams, R. and W.K. de la Mare
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Mesopelagic fish of the Southern Ocean - summary results of recent Soviet studies
Paper Title: Mesopelagic fish of the Southern Ocean- summary results of recent Soviet studies ... a part of the general multi-disciplinary program of research on Antarctic biological resources ... . Studies concentrate primarily on the following four most abundant species: Electrona carlsbergi, Electrona ... antarctica, Krefftichthys (Protomyctophum) anderssoni and Gymnoscopelus nicholsi. The data obtained so far ... plankton development. Reproduction: Spawning apparently takes place at the end of winter (June/July) or ... at the beginning of spring (August/September). From November to May gonads of E. carlsbergi were ... the end of autumn or in the winter (April to June). Feeding: The diet of G. nicholsi consists of ... WG-FSA-90/23 MESOPELAGIC FISH OF THE SOUTHERN OCEAN ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 433–457 : Autor(es): Sabourenkov, E.N.