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Bias in the estimation of krill yield from using a deterministic formulation of the median unexploited spawning biomass
Paper Title: Bias in the estimation of krill yield from using a deterministic formulation of the ... unexploited spawning biomass. These models are used in order to account for uncertainty in the biological ... model as a basis for setting catch limits in the krill fishery, while the GYM is used for assessing ... yield in other finfish fisheries but can also be used for krill. The decision rules relate to the ... spawning biomass after 20 and 30 years relative to median So in each run with no fishing was 1.099 and ... and for three levels of y - 0.15, 0.2 and 0.4. Projections for 20 years and 30 years were undertaken ... Butterworth et al. (1994). Values in parentheses are probabilities of depletion over a 30-year projection ... perio . Table 2: Escapement of spawning biomass at the end of 20 and 30-year projections for different ...
Science Journal Paper : CCAMLR Science, Volume 5 (CCAMLR Science, Volume 5) : 1–8 : Autor(es): Constable, A.J. and W.K. de la Mare
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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 ... fishery of varying intensity, in peak years yielding a total catch of over 100 000 tonnes (Kock, 1992 ... consider only those fish greater than or equal in total length to 30 cm. This group is composed of ... been measured and which were 30 cm or greater in total length: males: total mass = 0.001322.L,"J5 ... percentage increases, in the case of female Antarctic fish, to over 20% in the months leading up to ...
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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Analysis of trends in Japanese krill fishery CPUE data, and its possible use as a krill abundance index
Paper Title: Analysis of trends in Japanese krill fishery CPUE data, and its possible use as a ... definitions of effort and catch-per-unit-effort (CPUE), variables were modelled using linear mixed models in ... . The results strongly suggest that the krill fishery in the South Georgia area is operating at a ... critical level of krill availability which is just enough to maintain the best factory performance. In this ... for those years during which the fi shery has operated. In the late 1980s, several attempts were ... . TTPD was very small (≈30 min) in the 1980/81 season, and showed a rapid increase until the 1985/86 ... to spend more time searching on their own behalf than in previous years. CPUE indices showed a ... where fl eets can maximise their production extends further offshore in years of high, compared to ...
Science Journal Paper : CCAMLR Science, Volume 12 (CCAMLR Science, Volume 12) : 1–28 : Autor(es): Kawaguchi, S., S. Candy, S. Nicol, K. Taki and M. Naganobu
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Fish stock assessment survey in Subarea 48.3
Paper Title: Fish stock assessment survey in Subarea 48.3 Abstract / Description: A demersal ... fish survey in the vicinity of South Georgia, CCAMLR Subarea 48.3, is described. Details are given of ... important commercial species in the area, Champsocephalus gunnari, is shown to have undergone a major ... at 20 cm, which coincides with the trough in the length distribution. The length frequency ... , which have been a major component in the diet of C. gunnari in previous years, were rarely the dominant ... 1 22 1 6 13 53 19.80 42 44.30 463 27 2 22 1 10 10 53 28.40 42 18.20 232 30 3 22 1 14 20 53 26.00 ... 6.00 188 30 18 26 1 11 58 53 48.20 38 23.80 183 30 19 26 1 14 32 53 38.00 37 51.00 176 21 20 27 1 4 ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/8 (Selected Scientific Papers, SC-CAMLR-SSP/8) : 25–67 : Autor(es): Everson, I., G. Parkes, K.-H. Kock, S. Campbell, Z. Cielniaszek and J. Szlakowski
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The Soviet krill fishery in the Atlantic Sector of the Antarctic from 1977 to 1991: fishing effort distribution and interannual patterns
Paper Title: The Soviet krill fishery in the Atlantic Sector of the Antarctic from 1977 to 1991 ... fishery in the Atlantic Sector of the Antarctic from 1977 to 1992 are discussed. The total fishing effort ... from 1977 to 1991 was 50 086 vessel-days fished, in Subareas 48.3 (45% of the total for the period ... ), 48.2 (36%) and 48.1 (19%). Three distinct patterns in the distribution of monthly fishing effort ... 0 0 0 0 0 0 0 91 7 1. 8 R T M S 92 86 30 4 39 6 20 6 20 2 11 6 89 ... distribution for several years at a time: the three major patterns in the distribution of fi shing effort ... leaving, vessels worked in Sub- area 48.2 and reported good fi shing conditions with up to 10–20 tonnes ... of krill taken in 1–2 hauls during the day and 10–20 tonnes in 3–4 hauls at night. In January 1983 ...
Science Journal Paper : CCAMLR Science, Volume 10 (CCAMLR Science, Volume 10) : 1–13 : Autor(es): Litvinov, F.F., V.A. Sushin, G.A. Chernega and O.A. Berezhinsky
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A preliminary assessment of the stock of the ommastrephid squid Martialia hyadesi in the Scotia Sea based on data from predators
Paper Title: A preliminary assessment of the stock of the ommastrephid squid Martialia hyadesi in ... Martialia hyadesi; will be attempted in the future. This squid is an important component of the diet of ... several species of albatross and the southern elephant seal and is probably taken in significant ... predators in the Scotia Sea is 326 098 to 330 642 tonnes, 94% of which is taken by southern elephant seals ... OF THE OMMASTREPHID SQUID MARTIALIA BY ADESI IN THE SCOTIA SEA BASED ON DATA FROM PREDATORS· P.G ... exploitation of the sub-Antarctic ommastrephid species Martialia hyadesi will be attempted in the future. This ... seal and is probably taken in significant quantities by several other Southern Ocean vertebrate ... predators. Estimated annual consumption by known predators in the Scotia Sea is 326 098 to 330642 tonnes ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 479–480 : Autor(es): Rodhouse, P.G.
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An iterative model to construct an age/length key to assess the age composition of a new fishery for Dissostichus eleginoides in Chilean waters
new fishery for Dissostichus eleginoides in Chilean waters Abstract / Description: Traditional ... los 3 y 20 aiios y la moda estuvo en el grupo de edad 12. En general se aprecia que los machos son ... errors in cohort analysis. American Fisheries Society Symposium, 6: 49-65. ROBOTHAM, H., V. OJEDA Y W ... de la captura de Merluccius australis. En prensa. WESTRHEIM, S.J. and RICKER, W.E. 1978. Bias in ... 14378 1,63 12631 1,44 19 1796 0,20 1760 0,20 20 1058 0,12 1378 0,16 Total 880772 100,00 879866 ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/9 (Selected Scientific Papers, SC-CAMLR-SSP/9) : 11–20 : Autor(es): Robotham, V. H. and Z. Young U.
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Supplementary data on exploited stocks in Division 58.5.1 (Kerguelen)
Paper Title: Supplementary data on exploited stocks in Division 58.5.1 (Kerguelen) Abstract ... / Description: The results of fishing cruises carried out from 1986/87 to 1988/89 in Division 58.5.1 (Kerguelen ... average annual growth of 36% has been noted in the abundance of the juvenile section of the stock of ... research cruises. The abundant 1985 cohort of Champsocephalus gunnari appeared in the shelf stock and it ... than three years present over the Kerguelen Shelf was carried out in 1987 and 1988 (Duhamel, 1988 ... correspond to (be followed by) a doubling of the biomass of the stock in five years. The implementation of ... little less than three years. The growth in the biomass of the juvenile stock is noted and a deferred ... due to a change in fishing methods recorded in the past few years (selective use of semipelagic ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/6 (Selected Scientific Papers, SC-CAMLR-SSP/6) : 147–161 : Autor(es): Duhamel, G.
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Diurnal variations in biological characteristics of krill, Euphausia superba Dana, to the west of the South Orkney Islands, 24 March to 18 June 1990 - based on data reported by a biologist-observer
Paper Title: Diurnal variations in biological characteristics of krill, Euphausia superba Dana ... biologist-observer Abstract / Description: Investigations of diurnal variations in the size composition of ... from March to June 1990. Observations at six daily stations were carried out in various locations ... trawl (9 to 12 tows per station, over one day). An increase in the total average size of animals caught ... to 14 and 18 to 20 hrs. Some changes were also observed in females, but they were less evident than ... WG-KRlLL-92/9 DIURNAL V ARIATIONS IN BIOLOGICAL ... * Abstract Investigations of diurnal variations in the size compoSItion of Euphausia superba were carried ... . Observations at six daily stations were carried out in various locations inside the fishing area. Each station ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/9 (Selected Scientific Papers, SC-CAMLR-SSP/9) : 201–222 : Autor(es): Vagin, A.V., R.R. Makarov and L.L. Menshenina
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Marine debris and fishing gear associated with seabirds at sub-Antarctic Marion island, 1996/97 and 1997/98: in relation to longline fishing activity
island, 1996/97 and 1997/98: in relation to longline fishing activity Abstract / Description: Marine ... debris found in association with seabirds at sub-Antarctic Marion Island for the period May 1996 to April ... suspending Patagonian toothfish (Dissostichus eleginoides) in blast freezers and 23 toothfish hooks were ... been found in association with seabird nests at Marion Island. Fishery-related marine debris was found ... opposed to 1 300 (Gales, 1998)) and that the amount of hooks set in the respective years was very ... FISHING GEAR ASSOCIATED WITH SEABIRDS AT SUB-ANTARCTIC MARION ISLAND, l996197 AND 1997198: IN RELATION ... Ornithology University of Cape Town Rondebosch 7701, South Africa Abstract Marine debris found in ... eleginoides) in blast freezers and 23 toothfish hooks were found. Prior to this study only three hooks (all ...
Science Journal Paper : CCAMLR Science, Volume 6 (CCAMLR Science, Volume 6) : 85–96 : Autor(es): Nel, D.C. and J.L. Nel