Search results
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The influence of bait quality on the sink rate of bait used in the Japanese longline tuna fishing industry: an experimental approach
Paper Title: The influence of bait quality on the sink rate of bait used in the Japanese longline ... determine the effects of bait size (large versus small) and bait condition (frozen versus thawed) on the ... sink rate of five species of bait used in the Japanese longline tuna fishery in Tasmanian waters. The ... effect of adding lead sinkers to baited hooks was also examined. While all factors (bait species, size ... of the swim bladders of fish, and was not known at the time of the experiments. To remove the ... hook is placed in a bait, the angle at which the shank of the hook protrudes from the fish, and the ... without standard deviation for the sake of simplicity. specimens of thawed aji-l (both sizes) sank at ... suppliers and may have been caught at different locations and/or at different times of the year. Some ...
Science Journal Paper : CCAMLR Science, Volume 2 (CCAMLR Science, Volume 2) : 123–129 : Author(s): Brothers, N., A. Foster and G. Robertson
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Validation of sink rates of longlines measured using two different methods
Paper Title: Validation of sink rates of longlines measured using two different methods Abstract ... / Description: Sink rates of integrated weight longlines (lines with 50 g.m –1 lead integrated into two strands ... of the ground line – IW-50 lines) were measured during commercial fishing operations using two ... methods: electronic time depth recorders (TDRs) and pieces of string of known length wrapped around empty ... on the sink rates caused by the anchors at either end of the lines. When lines were set during the ... the internal temperature sensors of the TDRs and kept them at the same temperature as the seawater ... a measure of how a sinking longline behaved in the propeller-wash zone near the surface and at ... pressure transducer communications port 183 Validation of longline sink rates The time at which the ...
Science Journal Paper : CCAMLR Science, Volume 11 (CCAMLR Science, Volume 11) : 179–187 : Author(s): Wienecke, B. and G. Robertson
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Simulation of recovery rates of fish stocks in the South Georgia and Kerguelen Islands areas
Paper Title: Simulation of recovery rates of fish stocks in the South Georgia and Kerguelen ... Islands areas Abstract / Description: The benefits of conservation measures are generally based on the ... rebuilding of the depleted stocks and improvement in yields. It is desirable that such measures be based on ... the expected rate of recovery relative to rates of fishing. A simulation model based on a ... group also estimated that the stock could be expected to increase at an approximate rate of 30% per ... presents projections of the stocks and catch over the next 20 years for the major species of concern at ... over time, at least relative to the effects of recruitment. With these fixed parameters, the ... caught. The estimated fishing mortality at age was rather variable from year to year. The age of first ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/4 (Selected Scientific Papers, SC-CAMLR-SSP/4) : 229-298 : Author(s): Hennemuth, R.C., K.D. Bisack and G. Duhamel
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Possible effects of different levels of krill fishing on predators – some initial modelling attempts
Paper Title: Possible effects of different levels of krill fishing on predators – some initial ... suggested by the Joint Meeting of CCAMLR's Working Group on Krill (WG-Krill) and Working Group for the ... CCAMLR Ecosystem Monitoring Program (WG-CEMP) in 1992, in order to investigate the possible effects of ... krill fishing on krill predators. First, estimates are made of the parameters of predator survival rates ... . one realised after any transient effects from the commencement of fishing at an intensity y have ... widening. The survival rates and breeding success of krill predators must depend, to some extent at ... least, on the level of krill biomass. Both will tend to be good at high biomass levels, and poor at ... for some of the parameters. To render the effects at work in the analysis of this paper more ...
Science Journal Paper : CCAMLR Science, Volume 2 (CCAMLR Science, Volume 2) : 79–97 : Author(s): Butterworth, D.S. and R.B. Thomson
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A Marine Protected Area scenario by New Zealand for the Ross Sea region
and the planning method by which the scenario was developed, and provides supplemental information requested ... method by which the scenario was developed, and provides supplemental information requested by the CCAMLR ...
Meeting Document : SC-CAMLR-XXX/10 : Author(s): Delegation of New Zealand
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Analyses of acoustic line-transect data from the waters around South Georgia: estimation of krill (Euphausia superba Dana) – biomass
Paper Title: Analyses of acoustic line-transect data from the waters around South Georgia ... : estimation of krill (Euphausia superba Dana) – biomass Abstract / Description: A large-scale acoustic survey ... of zooplankton stocks in the waters around South Georgia was carried out during November and December ... 1981. The data have been analysed using various definitions of strata. The total biomass in the area of ... at random to reduce the possibility of systematic errors. Each transect was divided into six ... (MVBS). 226 At the end of each section various 'station' activities were carried out as part of ... -107.8 Pulse duration was measured at 0.6 msec. Not all of the acoustic targets will have been krill ... . An estimate of the mean bottom depth was available for each section. The CTD profiles collected at ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/8 (Selected Scientific Papers, SC-CAMLR-SSP/8) : 225–243 : Author(s): Murphy, E., I. Everson and A. Murray
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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
Paper Title: Distribution and relative abundance of juvenile icefish (Champsocephalus gunnari ... ) 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 ... juvenile trawl of 13.6 m. The size range of juvenile icefish collected was 82–146 mm. Catches were the ... -bottom (2-5 m off the sea-bed), mid-Water and near surface. The duration of each haul was 10 minutes at ... station at one location was sampled with 16 tows. * the term "stratum" refers to the shelf zone of ... of 16 hauls was conducted to study vertical distribution of the juvenile mackerel icefish at one ... . The day-time catches of juvenile fish were in general 8.5 times higher than those at night. This ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/3 (Selected Scientific Papers, SC-CAMLR-SSP/3) : 55-63 : Author(s): Boronin, V.A., G.P. Zakharov and V.P. Shopov
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A balanced model of the food web of the Ross Sea, Antarctica
Paper Title: A balanced model of the food web of the Ross Sea, Antarctica Abstract / Description ... : A quantitative food web of the Ross Sea is presented here as a step towards investigating ecosystem ... effects of the fishery for Antarctic toothfish (Dissostichus mawsoni). The model consolidates quantitative ... information on trophic links across all the major biota of the Ross Sea and tests for data consistency. The ... of the Antarctic Slope Front (Jacobs, 1991) which, in part at least, hydrodynamically separates the ... Ross Sea (Norkko et al., 2004) is estimated to be unimportant to flows of material at the scale of ... of animals that died due to predation but were not consumed at the time; (v) transfers of biota ... ‘closest’ to the initial set of estimated parameters as defined below. The problem at this stage is non ...
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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Assessments of the stocks of Notothenia rossii marmorata and Champsocephalus gunnari in the South Georgia area
Paper Title: Assessments of the stocks of Notothenia rossii marmorata and Champsocephalus gunnari ... in the South Georgia area Abstract / Description: The stocks of Notothenia rossii marmorata and ... estimates from surveys by the FRG. These data indicate that the stock of N. rossii in 1985 was about 2.5% of ... its pre-exploitation biomass, while the stock of Champsocephalus gunnari has fluctuated greatly with ... survivorship schedule, a range of alternatives must be considered. At one extreme, the survival rate can be ... - stock in the latter part of the 1970's, give some indication of the sustainable exploitation rate at ... would imply a maximum sustainable yield of 45,000 tonnes per annum at a recruited stock size of ... length distributions of the USSR catch at age samples are very dissimilar from FRG samples on which the ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/3 (Selected Scientific Papers, SC-CAMLR-SSP/3) : 1-21 : Author(s): Cooke, J.G.
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Mesopelagic fish of the Southern Ocean - summary results of recent Soviet studies
on Biological Resources ofTalassobathyal Zone of the World Ocean, Rhybnoye, November 1988. Moscow. pp. 27-28 ... . In: Integrated Fishery-Related Studies ofVNIRO in the World Ocean. Moscow. pp. 19-43. (In Russian). MAZHIRYNA ... 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 ... are sufficient to allow a description of the general ecology and distribution of these species. Some ... recently published results of these studies. A general description of mesopelagic myctophids is followed by ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 433–457 : Author(s): Sabourenkov, E.N.