Search results
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Preliminary results of investigations of the Federal Republic of Germany on Notothenia rossii marmorata (Fischer, 1885) in January/February 1985
to rebuild the stock around South Georgia might be successful. Although reported catches in recent years have ... years have been low, N. rossii around South Georgia is still largely affected by the fishery. Stock size ... with a sr.1211 meshed liner of 20 mm (figs. 1,2). Total length of the spcci.mcn.s wDi:; 1nec1sured to Ll1e ... around South Georgia might be successful. Although reported catches in recent years have been low ... the onset ot large scale commercial exploitation at Lhf> end of the 1960s Lhe c-,pecies 1,>as probably one ... concentrations had already been noted by sealers i.n the early 19th (F.~NXT:iG, 1833) and whale.re ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/2 (Selected Scientific Papers, SC-CAMLR-SSP/2) : 33-57 : Author(s): Kock, K.-H.
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Estimation of natural mortality for the Patagonian toothfish at Heard and McDonald Islands using catch-at-age and aged mark-recapture data from the main trawl ground
proportions-at-length and fishery- and year-specific age–length keys (ALKs) for years 1998 to 2008. A large ... ordinary differential equations (ODE) for within-year population dynamics. These are the BODE model ... obtained using proportions-at-length and fishery- and year-specific age–length keys (ALKs) for years ... in R, based on alternative ordinary differential equations (ODE) for within-year population dynamics ... died out through natural mortality; (ii) it has been fished out; and (iii) it has been subject ... within 60 days of release or recaptures within the same within-year season of early-season (1 December ... strongly in later fishing years, most probably for a combination of the following reasons: (i) it has ... and releases by age class for this fishery were obtained using proportions-at-length and fishery- and year ...
Science Journal Paper : CCAMLR Science, Volume 18 (CCAMLR Science, Volume 18) : 29–45 : Author(s): Candy, S.G., D.C. Welsford, T. Lamb, J.J. Verdouw and J.J. Hutchins
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An assessment of CCAMLR measures employed to mitigate seabird mortality in longlining operations for Dissostichus eleginoides around South Georgia
place, and as far as possible to cover the early, middle and late stages of Assessment of CCAMLR ... ). In the following year, CCAMLR-designated observers reported extensive interactions of the fishery with seabirds ... variability in mortality rate was found between years and between months, but the presence of a streamer ... early May, therefore Ashford and Croxall restrictions on the timing of the fishery may reduce ... operations for Dissostichus eleginoides off South Georgia were assessed for interactions with seabirds and ... lines were laid from March to May 1997 using the Spanish double-line method. In accordance with CCAMLR ...
Science Journal Paper : CCAMLR Science, Volume 5 (CCAMLR Science, Volume 5) : 217–230 : Author(s): Ashford, J.R. and J.P. Croxall
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Age–length composition of mackerel icefish (Champsocephalus gunnari, Perciformes, Notothenioidei, Channichthyidae) from different parts of the South Georgia shelf
the eastern, northern, western and southern parts of the shelf, and near Shag Rocks, revealed a similar age ... . Differences were observed between those those two groups and the eastern group. The larger number of mature ... fish in the west is related to the migration of maturing individuals from the eastern and western parts ... of the area. It is implied that part of tlne western group migrates towards Shag Rocks at the age of 2-3 years ... - formed commercial concentrations in the northwest. In later years, C. gtlnizari was observed ... . An analysis of the spatial distribution of C. giirzrznri size and age groups over the eastern, northern ... in the west is related to the migration of maturing individuals from the eastern and western parts ... of 2-3 years. It has been found that, by number, recruits represent the largest part of tlne population ...
Science Journal Paper : CCAMLR Science, Volume 8 (CCAMLR Science, Volume 8) : 133–146 : Author(s): Frolkina, G.A
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A balanced model of the food web of the Ross Sea, Antarctica
trophic groups and is balanced in terms of annual flows of organic carbon in an average recent year (1990 ... recent year (1990–2000). The focus of the model is on the role of Antarctic toothfish in the food ... , starvation); (iv) ‘messy eat- ing’ i.e. parts of animals that died due to predation but were not consumed ... that primary production in the water column in the Ross Sea is bimodal (DiTullio et al., 2000; Smith et al ... trophic groups and is balanced in terms of annual flows of organic carbon in an average recent year (1990 ... or typical year, rep- resentative of the state of the Ross Sea food web during the period 1990–2000 ...
Science Journal Paper : CCAMLR Science, Volume 17 (CCAMLR Science, Volume 17) : 1–31 : Author(s): Pinkerton, M.H., J.M. Bradford-Grieve and S.M. Hanchet
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Age and growth of the Antarctic skate (Amblyraja georgiana) in the Ross Sea
of 6–7 years for males and 8–11 years for females. These estimates are near the middle to upper end ... of 6–7 years for males and 8–11 years for females. These estimates are near the middle to upper ... not been validated. The maximum estimated age was 14 years, but this should be regarded as a conservative ... L t is the pelvic length (PL) in centimetres at age t years. Applying this growth curve to the estimated lengths ... for the datasets including outliers. Reading 1 0 2 4 6 8 10 12 14 16 R ea di ng 2 (m ea n ± 2S ... 1 2 2 8 3 1 4 2 5 1 1 1 6 2 5 2 1 1 1 1 7 2 1 2 2 1 3 7 4 1 1 1 3 1 3 3 1 1 2 3 6 3 1 1 2 2 2 1 1 1 3 1 1 1 3 1 1 1 2 1 R ea di ng 2 (m ea n ± 2S E ) Figure 3: Within-reader comparison of thorn band counts ... – revisited. In: di Prisco, G., E. Pisano and A. Clarke (Eds). Fishes of Antarctica: a Biological Overview ... for males and 8–11 years for females. These estimates are near the middle to upper end of the range of ages ...
Science Journal Paper : CCAMLR Science, Volume 12 (CCAMLR Science, Volume 12) : 183–194 : Author(s): Francis, M.P. and C. Ó Maolagáin
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Distribution of mackerel icefish (Champsocephalus gunnari) (Channichthyidae) around South Georgia at various stages of its life cycle
to be dis- tributed throughout the water column at all times of the day, but they also undertake vertical ... was obtained and its functional structure described. The South Georgia population of C. gunnari is dis ... of the shelf where depth was mainly about 200 m, while mature fi sh were dis- tributed in the northern area ... migrate to the Shag Rocks area most probably die after reaching two years of age. The abovementioned ...
Science Journal Paper : CCAMLR Science, Volume 9 (CCAMLR Science, Volume 9) : 49–69 : Author(s): Frolkina, Zh.A
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Precautionary spatial protection to facilitate the scientific study of habitats and communities under ice shelves in the context of recent, rapid, regional climate change
. In: di Prisco, G. and C. Verde (Eds.). Adaptation and evolution in marine environments, Volume 1, From ... , G. Di Prisco, E. Fahrbach, J. Gutt, D.A. Hodgson, P.A. Mayewski and C.P. Summerhayes (Eds.). 2009a ... of the northern edge of the George VI ice shelf (67.840°W 71.692°S) which lost ~993 km2 over a number of years ... to recover (Kock, 1992). These over-exploited fisher- ies still remain closed some 23 years later. No com ... the loss of existing marine habitats and to the creation of new habitats, with consequent changes in ...
Science Journal Paper : CCAMLR Science, Volume 20 (CCAMLR Science, Volume 20) : 139–151 : Author(s): Trathan, P.N., S.M. Grant, V. Siegel and K.-H. Kock
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An assessment of the impact of krill fishery on penguins in the South Shetlands
obtained around Elephant Island and the eastern end of King George Island in late January and early March ... BbInOBa, TO BeCbMa ManOBePORTHO, 9 T O c y w e c ~ ~ y m u @ i npoMbrcen ... for the past ten years (CCAMLR, 1993), so only Japanese data were used here. As regards land-based predators ... for the following three months (Figure 2). Fishing was initially (in early and mid-January) concentrated over ... . Compared with the level of biomass (≥200 x 10 3 tonnes) and its variability (the order of 100 x 10 3 ... constant (3 000 to 10 000 tonnes/10-day period) due to an increase in fishing intensity in areas closer to ... large as 200 to 1 500 x 10 3 tonnes within the preferred fishing areas during the breeding season ... tonnes/10-20-day period), the present catch rate (≤10 x 10 3 tonnes/1O-day period) is smaller by one or ...
Science Journal Paper : CCAMLR Science, Volume 1 (CCAMLR Science, Volume 1) : 107–128 : Author(s): Ichii, T., M. Naganobu and T. Ogishima
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Age, growth and mortality of Patagonian toothfish (Dissostichus eleginoides) caught off Kerguelen
was estimated to be –0.6 years and residual variance 2.9. Age distributions of toothfish caught by two vessels ... by trawlers and longliners at Kerguelen, and longevity was estimated to be 36 years. Total instantaneous ... to measure precision; relative bias for the age data was estimated to be –0.6 years and residual ... at Kerguelen, and longevity was estimated to be 36 years. Total instantaneous mortality Z was estimated ... for the age data was estimated to be –0.6 years and residual variance 2.9. Age distributions of toothfi sh ... catches made by trawlers and longliners at Kerguelen, and longevity was estimated to be 36 years. Total ... лежит в диапазоне Ashford et al. 30 Introduction In contrast to early sealing and whaling ... (Jones, 1992). By monitoring these through time, fi shery man- agers can detect trends indicating ...
Science Journal Paper : CCAMLR Science, Volume 12 (CCAMLR Science, Volume 12) : 29–41 : Author(s): Ashford, J., G. Duhamel, C. Jones and S. Bobko