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Results of fish stock assessment survey, South Georgia region, November - December 1986
/85 year classes. Coefficients of variation ranged from 67.9% (Notothenia squamifrons) to 12.6 ... than 1984/85, probably due to good recruitment of 1983/84 and 1984/85 year classes. Coefficients ... and 20 cm (Figure 5) would correspond to age groups 1-3, respectively; a mode expected near 26 cm (age ... 4) is not evident; and the peak at 38 cm would correspond to age 8 fish (1978;79 year class) (Boronin ... age 3-5 fish, with relatively few age 6-8 year olds (25-29 cm). The peak at 37-38 cm would ... then correspond to age 12 fish, the 1974;75 year class. Biomass at Shag Rocks was relatively low (400 mt ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/4 (Selected Scientific Papers, SC-CAMLR-SSP/4) : 143-183 : Author(s): Gabriel, W.L.
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Mesopelagic fish of the Southern Ocean - summary results of recent Soviet studies
on their feeding, reproduction and age/length composition. The paper summarizes recently published results ... on their feeding, reproduction and age/length composition. The paper summarizes recently published results ... reported length was 12.5. Maximum age is 4 to 5 years. Age of maturity is 2 to 3 years (Shust and Kochkin ... of samples taken in different areas are shown in Figure 3. Maximum age is not greater than 5 years. A slight ... ). Maximum reported length was 10.5. Maximum age is 4 to 5 years. Age of maturity is 2 to 3 years (Shust ... 5. Maximum age is less than 5 years. Annual growth rate is 2.7 to 3.4 cm. Growth pattern is considered ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 433–457 : Author(s): Sabourenkov, E.N.
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Effects of recruitment variability and natural mortality on generalised yield model projections and the CCAMLR decision rules for Antarctic krill
based on maximum age. Murphy and Reid (2001) suggested that a value of 1.25 produced the best match ... inputs to the GYM include the CV of the unexploited biomass B0, weight-at-length/age relationships ... . Modelling Antarctic krill: scale, movement, and age-structure. Document WG-EMM-11/43 Rev. 1. CCAMLR ... below 20% of its pre-fishing median level over a twenty-year period, called the ‘threshold ... projections and the CCAMLR decision rules for Antarctic krill Abstract / Description: The generalised yield ... model (GYM) was used by CCAMLR to establish the precautionary catch limit for the Antarctic krill ... natural mortality rate of 0.8 and recruitment variability generated using a Beta distribution for ... proportional recruitment of krill. In this study, krill sampling data for empirical size frequencies were ...
Science Journal Paper : CCAMLR Science, Volume 20 (CCAMLR Science, Volume 20) : 81–96 : Author(s): Kinzey, D., G. Watters and C.S. Reiss
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Is the attempt to estimate the biomass of Antarctic fish from a multi-species survey appropriate for all targeted species? Notothenia rossii in the Atlantic Ocean sector – revisited
, Hobart, Australia: 30 pp. Barrera-Oro, E.R. and R.J. Casaux. 1992. Age deter- mination of juvenile ... in the area. CCAMLR Science, 7: 43–52. Burchett, M.S. 1983. Age and growth of the Ant- arctic fi sh ... (1): 58–64. Freytag, G. 1980. Length, age and growth of No tothenia rossii marmorata Fischer 1885 ... . Age determination of Antarctic fi sh. Cybium, 1980 (8): 7–11. Parkes, G.B. 1991. The UK fi sh stock ... appropriate for all targeted species? Notothenia rossii in the Atlantic Ocean sector – revisited Abstract ... already heavily fished at the beginning of the 1970s. The closure of the fishery for this species in 1985 ... to provide more accurate estimates of the abundance of the species, it is suggested that an acoustic ...
Science Journal Paper : CCAMLR Science, Volume 11 (CCAMLR Science, Volume 11) : 141–153 : Author(s): Kock, K.-H., M. Belchier and C.D. Jones
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Identifying taxonomic groups vulnerable to bottom longline fishing gear in the Ross Sea region
approached 30 years of age (Miller et al., 2004). Stylasterids can be large, up to 1 m in height in Alaska ... Rhabdocalyptus dawsoni in a British Columbia fjord, extrapolated to 220 years of age for large speci- mens ... m near the Bahamas was aged using amino acid com- position at 250 years, which conflicted with a radi ... - ocarbon age estimate of 1 800 years (Goodfriend, 1997). Subsequently, several specimens have been shown ... the fishery being assessed. New Zealand identified an interim list of taxa to monitor in fishery by ... -catch in the Ross Sea as part of its benthic fisheries impact assessment. The rationale for including or ...
Science Journal Paper : CCAMLR Science, Volume 17 (CCAMLR Science, Volume 17) : 105–127 : Author(s): Parker, S.J. and D.A. Bowden
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Distribution of mackerel icefish (Champsocephalus gunnari) (Channichthyidae) around South Georgia at various stages of its life cycle
into account the spatial–temporal variability of C. gunnari. Young fish of the first age group (<15 cm ... of C. gunnari. Young fish of the first age group (<15 cm in length) were mainly found in the southern part ... and northwest. Until they reach three years of age (at a length of about 25 cm) these groups remain ... in age–length distribution and mean length of 2- to 4-year-old fi sh in the western and Shag Rocks ... Shag Rocks. As a rule, this species is not fi shed commercially until it reaches three years of age ... ; rarely at the age of 2 years. The age–length distribution for all years of observation showed ...
Science Journal Paper : CCAMLR Science, Volume 9 (CCAMLR Science, Volume 9) : 49–69 : Author(s): Frolkina, Zh.A
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Sensitivity investigation of the SDWBA Antarctic krill target strength model to fatness, material contrast and orientation
. In this study, the SDWBA TS pattern and frequency response behaviours at standard survey frequencies and animal ... and the distribution of animal orientations. Due to the high variability of TS to realistic changes in parameters ... at standard survey frequencies and animal lengths are explored via a sensitivity analysis of some important ... the organism and the surrounding seawater and the distribution of animal orientations. Due to the high ... of the new SDWBApack age2010 was evaluated using sensitivity tests of some parameters with regard to krill ... no ta tio n in t hi s pa pe r (S ym bo l) an d SD W B A pa ck ag e2 00 50 60 3 al ... go rit hm . C la ss Pa ra m et er Sy m bo l Pa ck ag e va ria bl e U ni ... ag e2 00 50 60 3 an d di gi tis ed M cG eh ee e t al . (1 99 8) sh ap e vo lu ...
Science Journal Paper : CCAMLR Science, Volume 18 (CCAMLR Science, Volume 18) : 97–122 : Author(s): Calise, L. and G. Skaret
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A preliminary investigation of the possible effects of rhizocephalan parasitism on the management of the crab fishery around South Georgia
the main characteristics of the system. An age-based host-parasite model is constructed, incorporating two ... a population model that captures the main characteristics of the system. An age-based host-parasite model ... of the main effects of the parasite is to render infected animals sterile. Parasitism can therefore reduce ... in spawning stock. The effects of harvesting both healthy and infected animals are contrasted with the effects ... of healthy animals. Also recall that there is at least one year (i.e., age class) in which mature animals ... in the previous year. Once a crab is infected it remains infected. Male crabs are harvested at a size/age one ... in each age class, with two categories for each age class: healthy animals and infected animals. Natural ... of healthy animals (i.e., susceptibles) in that age class. The coefficient of proportionality (or infection ...
Science Journal Paper : CCAMLR Science, Volume 1 (CCAMLR Science, Volume 1) : 175–192 : Author(s): Basson, M
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Distribution and size–age composition of Antarctic krill (Euphausia superba) in the South Orkney Islands region (CCAMLR Subarea 48.2).
Paper Title: Distribution and size–age composition of Antarctic krill (Euphausia superba ... ) in the South Orkney Islands region (CCAMLR Subarea 48.2). Abstract / Description: The distribution, size–age ... . The distribution of size–age groups in association with particular water masses indicated that age 2+ krill ... dominated in cold Weddell Sea waters in the southern parts of the fishing area, while older age classes ... 25–30 mm) and 2-year-old krill (age 2+; modal length 40–45 mm); the 3-, 4- and 5-year-old krill age ... was apparent with only a small pro- portion of individuals of this generation found in catches in 2009 (age ... 3 and 6). Similar results indicating the absence of krill less than 28–30 mm (1+ age cohort) were reported ... papers have reported the presence of juvenile E. superba (1+ age cohort) of less than 30 mm TL, down ...
Science Journal Paper : CCAMLR Science, Volume 18 (CCAMLR Science, Volume 18) : 123–134 : Author(s): Sologub, D.O. and A.V. Remeslo
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A hypothetical life cycle for Antarctic toothfish (Dissostichus mawsoni) in the Ross Sea region
of Antarctic toothfish (Dissostichus mawsoni) in the Ross Sea region are reviewed. Based on the presumed ... mawsoni) in the Ross Sea region are reviewed. Based on the presumed location and timing of spawning ... to an age of 9–10 years (Dunn and Hanchet, 2006). However, Livingston and Grimes (2005) consid- ered ... slope areas. Fish mature at a length of 100–120 cm, at an age of 8–12 years, by which time they have ... understand- ing of the depth, location and size and age distri- bution of the D. mawsoni catch (e.g. Hanchet ... and abun- dance (e.g. Dunn and Hanchet, 2006; Fenaughty, 2006), age and growth (Horn, 2002; Horn et al ...
Science Journal Paper : CCAMLR Science, Volume 15 (CCAMLR Science, Volume 15) : 35–53 : Author(s): Hanchet, S.M., G.J. Rickard, J.M. Fenaughty, A. Dunn and M.J. Williams