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Age, growth and size at sexual maturity of Macrourus carinatus caught as by-catch in Australian sub-Antarctic trawl fisheries
Paper Title: Age, growth and size at sexual maturity of Macrourus carinatus caught as by-catch in ... McDonald Islands (Division 58.5.2) in 1992 and 1993. The range of estimated ages was 4 to 25 years. There ... were no significant differences in growth parameters calculated for males and females. Von Bertalanffy ... operations in the Heard Island region in 2000. The length at first maturity (L 50) was 418 mm (total length ... /February 1992 and September 1993, and a commercial trawl fi shing trip to Heard and McDonald Islands in ... commercial trawl fi shing trip to Heard and McDonald Islands in September/October 2000. The fi sh were ... BY-CATCH IN AUSTRALIAN SUB-ANTARCTIC TRAWL FISHERIES E.M. van Wijk , R. Williams and A.J ... otolith samples collected during two research voyages to Heard and McDonald Islands (Division 58.5.2) in ...
Science Journal Paper : CCAMLR Science, Volume 10 (CCAMLR Science, Volume 10) : 139–151 : Autor(es): van Wijk, E.M., R. Williams and A.J. Constable
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Distribution and relative abundance of juvenile icefish (Champsocephalus gunnari) from a trawl survey of the South Georgia shelf in June–July 1985
) from a trawl survey of the South Georgia shelf in June–July 1985 Abstract / Description: A trawl ... survey of the distribution and relative abundance of juvenile icefish (Champsocephalus gunnari) in South ... Georgia waters was carried out in June–July 1985. Shelf and slope areas extending from the 12 nautical ... highest in the west, south and south-east shelf areas and the greatest abundance was found in shallow ... station in a depth of 245-270 m, where the juvenile distribution was determined in the upper, middle ... . Juvenile mackerel icefish rarely occurred in the middle and surface layers during the 24-hour period ... ABUNDANCE OF JUVENILE ICEFISH (CHAMPSOCEPHALUS GUNNARI) FROM A TRAWL SURVEY OF THE SOUTH GEORGIA SHELF IN ... the distribution and relative abundance of juvenile icefish (Chamsocephalus gunnari) in South ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/3 (Selected Scientific Papers, SC-CAMLR-SSP/3) : 55-63 : Autor(es): Boronin, V.A., G.P. Zakharov and V.P. Shopov
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The role of fish as predators of krill (Euphausia superba) and other pelagic resources in the Southern Ocean (submitted to the 2008 Joint CCAMLR-IWC Workshop)
resources in the Southern Ocean (submitted to the 2008 Joint CCAMLR-IWC Workshop) Abstract / Description ... of fish as krill predators in the Southern Ocean is critical to understanding how changes in fish ... abundance, such as through fishing or environmental change, are likely to impact on the food webs in the ... region. First attempts to estimate the krill and pelagic food consumption by Antarctic demersal fish in ... OTHER PELAGIC RESOURCES IN THE SOUTHERN OCEAN K.-H. Kock* Institut für Seefischerei Johann Heinrich ... webs in the Southern Ocean (i.e. Kock et al., 2007a; Murphy et al., 2007a). Whether the marine ... Southern Ocean in winter or disperse over large areas (e.g. the Scotia Sea, the whole Southern Ocean or ... considerable interannual variability superimposed upon apparent trends in both physical and biologi- cal ...
Science Journal Paper : CCAMLR Science, Volume 19 (CCAMLR Science, Volume 19) : 115–169 : Autor(es): Kock, K.-H., E. Barrera-Oro, M. Belchier, M.A. Collins, G. Duhamel, S. Hanchet, L. Pshenichnov, D. Welsford and R. Williams
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Preliminary results of investigations of the Federal Republic of Germany on Notothenia rossii marmorata (Fischer, 1885) in January/February 1985
Notothenia rossii marmorata (Fischer, 1885) in January/February 1985 Abstract / Description: A bottom trawl ... survey carried out by FRV " Walther Hervig " in January/February 1985 was used to collect ... rebuild the stock around South Georgia might be successful. Although reported catches in recent years have ... probably still less than 10% of the pristine stock, Mean length in the catches has only slightly increased ... NOTOTHENIA ROSSII MARMORATA (FISCHER, 1885) IN JANUARY/FEBRUARY 1985 Abstract A bottom trawl survey ... carried out by FRV "Walther Hervig" in January/February 1985 was used to collect further basic: data ... around South Georgia might be successful. Although reported catches in recent years have been low, N ... than 10% of the pristine stock, Mean length in the catches has only slightly increased since 1981/82 ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/2 (Selected Scientific Papers, SC-CAMLR-SSP/2) : 33-57 : Autor(es): Kock, K.-H.
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Factors to consider in developing management measures for krill
Paper Title: Factors to consider in developing management measures for krill Abstract ... WG-KRILL-90/14 FACTORS TO CONSIDER IN DEVELOPING ... . INTRODUCTION If krill (Euphausia superba, Dana) were considered in isolation it is reasonably certain that ... baleen whales in the Antarctic (Laws, 1977). The baleen whales were the object of major fisheries, with ... Antarctic Marine Living Resources (CCAMLR). This is in contrast to the situation under which most other ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 175–187 : Autor(es): de la Mare, W.K.
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Variations in condition indices of mackerel icefish at South Georgia from 1972 to 1997
Paper Title: Variations in condition indices of mackerel icefish at South Georgia from 1972 to ... responds rapidly to changes in krill density and therefore can provide indications of short-term variations ... in krill availability. Condition index provides a useful proxy for krill density and is likely to be ... of considerable value in interpreting the results from ecosystein assessments such as that in ... the breeding site. The foraging trip and diet parameters integrate over these same scales but in ... CCAMLR Scier~ce, Vol. 8 (2001): 119-132 VARIATIONS IN ... is much less than the highest observed values. The condition index responds rapidly to changes in ... krill density and therefore can provide indications of short-term variations in krill availability ...
Science Journal Paper : CCAMLR Science, Volume 8 (CCAMLR Science, Volume 8) : 119–132 : Autor(es): Everson, I. and K.-H. Kock
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Prey monitoring surveys: a discussion of the characteristics necessary in prey surveys
Paper Title: Prey monitoring surveys: a discussion of the characteristics necessary in prey ... distribution to relate to changes in predator demography. The paper discusses the constraints imposed on such ... DISCUSSION OF THE CHARACTERISTICS NECESSARY IN PREY SURVEYS I. Everson (United Kingdom) Abstract The ... CCAMLR Ecosystem Monitoring Programme requires information on prey distribution to relate to changes in ... CHARACTERISTICS NECESSARY IN PREY SURVEYS Inigo Everson British Antarctic Survey Natural Environment ... parameters is believed to be praticable. Evaluation of the cause of changes in the values of these ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/4 (Selected Scientific Papers, SC-CAMLR-SSP/4) : 377-391 : Autor(es): Everson, I.
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Consideration of major issues in ecosystem monitoring and management
Paper Title: Consideration of major issues in ecosystem monitoring and management Abstract ... interactions and the manner in which their populations vary naturally. Large-scale interactions are catered for ... in the Krill Yield Model (KYM). Smaller-scale interactions centre around three main categories: the ... availability of krill, variation in vital rates of the dependent species and the overlap between commercial ... . 9 (2002): 213–232 213 CONSIDERATION OF MAJOR ISSUES IN ECOSYSTEM MONITORING AND MANAGEMENT I ... for information on harvested and dependent species, their interactions and the manner in which their ... populations vary naturally. Large-scale interactions are catered for in the Krill Yield Model (KYM ... ). Smaller-scale interactions centre around three main categories: the availability of krill, variation in ...
Science Journal Paper : CCAMLR Science, Volume 9 (CCAMLR Science, Volume 9) : 213–232 : Autor(es): Everson, I
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Natural mortality rate in the mackerel icefish (Champsocephalus gunnari) around South Georgia
Paper Title: Natural mortality rate in the mackerel icefish (Champsocephalus gunnari) around ... careful consideration of the data and available methods, several errors are noted in earlier estimates ... , 1905) from South Georgia waters began in the 1960s and large-scale catches have been reported from ... NATURAL MORTALITY RATE IN THE MACKEREL ICEFISH (CHMPSOCEPHALUS GUNNARn AROUND SOUTH GEORGIA I. Everson ... and available methods, several errors are noted in earlier estimates. Unfortunately, because none of ... INTRODUCTION In age-structured models of fish population dynamics, total mortality (Z) can be estimated ...
Science Journal Paper : CCAMLR Science, Volume 5 (CCAMLR Science, Volume 5) : 245–257 : Autor(es): Everson, I
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Quantifying vessel performance in the CCAMLR tagging program: spatially and temporally controlled measures of tag-detection rates
Paper Title: Quantifying vessel performance in the CCAMLR tagging program: spatially and ... tagging program is critical to the successful management of a number of toothfish fisheries in Antarctica ... . In particular, tag-detection rates are directly linked to stock size estimated from the tag data in ... an integrated stock assessment. Previous attempts to assess the relative reliability of vessels in ... In CCAMLR Subareas 88.1 and 88.2, tag- release and -recapture data are used in an integrated age ... yields (Mormede et al., 2011a, 2011b; Mormede, 2011). In those analyses, the assumed values of ... parameters. For example, under- estimating the tag-detection rate of the fleet will result in an ... that there may be impor- tant differences between vessels in their respective detection rates of ...
Science Journal Paper : CCAMLR Science, Volume 20 (CCAMLR Science, Volume 20) : 73–80 : Autor(es): Mormede, S. and A. Dunn