Resultados de la búsqueda
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An assessment of CCAMLR measures employed to mitigate seabird mortality in longlining operations for Dissostichus eleginoides around South Georgia
-chinned petrels, two black-browed albatrosses and one unidentifiable bird caught on hooks. One giant ... for 18 birds caught; giant petrels concentrated on taking discarded offal, and accounted for five ... Paper Title: An assessment of CCAMLR measures employed to mitigate seabird mortality in ... longlining operations for Dissostichus eleginoides around South Georgia Abstract / Description: Longlining ... returning bait off the line and accounted for 18 birds caught; giant petrels concentrated on taking ... number of hooks was laid each night, either on one or two shorter longlines. All deck lights were ... lasting 20 minutes each over an observation period of 1.5 to 2 hours. Observations were made from the ... Fishng Master or his assistant from a work station on the aft and starboard quarter of the bridge. Two ...
Science Journal Paper : CCAMLR Science, Volume 5 (CCAMLR Science, Volume 5) : 217–230 : Autor(es): Ashford, J.R. and J.P. Croxall
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Some principles for fisheries regulation from an ecosystem perspective
Paper Title: Some principles for fisheries regulation from an ecosystem perspective Abstract ... regulation of fisheries from an ecosystem perspective, under the Convention for the Conservation of Antarctic ... Marine Living Resources. An important task in this formulation is to derive subsidiary objectives for ... out in the Convention. An important property required for subsidiary objectives is that they are ... the level of catches. On the other hand its simplicity may make it a suitable candidate for an ... principles to be considered in the formulation of a framework for the. regulation of fisheries from an ... ecosystem perspective, under the Convention for the Conservation of Antarctic Marine Living Resources. An ... . An important property required for subsidiary objectives is that they are framed in terms of ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/3 (Selected Scientific Papers, SC-CAMLR-SSP/3) : 323-339 : Autor(es): de la Mare, W.K.
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An impact assessment framework for bottom fishing methods in the CAMLR Convention Area
Paper Title: An impact assessment framework for bottom fishing methods in the CAMLR Convention ... cumulative impact on fragile benthic organisms from bottom fishing activity. The approach has been designed ... preliminary assessment of bottom fishing impacts for the 2008/09 toothfish longline fishery. This paper ... illustrates the utility of the standardised approach and provides a methodological template for systematic ... for new and explora- tory fisheries in 2008/09 (see New Zealand, 2008). What follows is an outline ... also provide a sound basis on which to complete an ERA in future. Definition of ‘Vulnerable Marine ... , in the New Zealand case, the impact of an anchor falling on the sea floor was assumed to be ... per set, enabling calculation of the anchor footprint on a per-set basis (i.e. two anchors on either ...
Science Journal Paper : CCAMLR Science, Volume 16 (CCAMLR Science, Volume 16) : 195–210 : Autor(es): Sharp, B.R., S.J. Parker and N. Smith
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Target strengths of krill at 136 and 20 kHz
Paper Title: Target strengths of krill at 136 and 20 kHz Abstract / Description: Estimation of ... . Ensonification of encaged live krill. For aggregations with mean lengths from 45 to 50 mm the mean single-krill ... target strengths range from-68 to-69 dB at 136 kHz. For aggregations with mean lengths from 43 to 47 mm ... the mean single-krill target strengths range from-71 to-77 dB at 20 kHz. Trawl hydroacoustic method ... the ability of krill to reflect sound ("reflectability") has been going on for more than ten years ... strengths range from -71 to -77 dB at 20 kRz. Trawl hydroacoustic method. For aggregations with mean ... Group on Krill called for a review of all current works on determination of krill target strength (TS ... krill with an average length of 45 to 50 mm, while at a frequency of 20 kHz target strength values of ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/8 (Selected Scientific Papers, SC-CAMLR-SSP/8) : 141–157 : Autor(es): Kasatkina, S.M.
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Notes on the use of virtual population analysis for stock assessment of the mackerel icefish, Champsocephalus gunnari (Lönnberg, 1906) in Subarea 48.3 for the 1990/91 and 1991/92 seasons
Paper Title: Notes on the use of virtual population analysis for stock assessment of the mackerel ... techniques, from 1991 back to 1977. The predicted age structure, dominated in recent years by the 1987 year ... proportion of 5 year olds, which was not observed during the survey on Falklands Protector in January 1992 ... icefish, Champsocephalus gunnari (Lönnberg, 1906) in Subarea 48.3 for the 1990/91 and 1991/92 seasons ... biomass of 5 year olds predicted by the VPA for 1991/92 might be an artefact of the analysis. In the ... the most recent year, and hence no terminal Fs for the VPA. This report presents notes on a reworking ... ). Annual recruitment, R was generated independently for each year on each run as follows: where R = mean ... SUBAREA 48.3 FOR THE 1990/91 AND 1991/92 SEASONS G. Parkes* Abstract Following on from the apparent ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/9 (Selected Scientific Papers, SC-CAMLR-SSP/9) : 49–79 : Autor(es): Parkes, G.
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Estimation of natural mortality using catch-at-age and aged mark-recapture data: a multi-cohort simulation study comparing estimation for a model based on the Baranov equations versus a new mortality equation.
obtained by integrating an ordinary differential equation (ODE) for within-year population dynamics. The ... multi-cohort simulation study comparing estimation for a model based on the Baranov equations versus a ... new mortality equation. Abstract / Description: An estimation strategy for natural mortality, M ... applied. Two alternative estimation models were developed both using a Poisson likelihood for annual ... obtained by integrating an ordinary differential equation (ODE) for within-year population dynamics. The ... time. The initial age structure at the first year of fishing and for subsequent years is obtained by ... ) model) uses an ODE with constant within-year catch per unit time for each age class, and as a result ... series of YCS, Γ pfy , for the pre-fishery (pf) years combined with the first year of the fishery ...
Science Journal Paper : CCAMLR Science, Volume 18 (CCAMLR Science, Volume 18) : 1–27 : Autor(es): Candy, S.G.
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Refinements to the strategy for managing depleted fish stocks based on CCAMLR objectives
Paper Title: Refinements to the strategy for managing depleted fish stocks based on CCAMLR ... fish stocks to recover to levels near those giving greatest net annual increment within two to three ... decades is illustrated. These fishing mortalities are based on probabilistic descriptions of the future ... that applying a policy of F 0.1 will not always lead to stock recovery in two to three decades, and ... been put into effect the target years for recovery become fixed at 20 and 30 years after the procedure ... a great effect on the levels of fishing mortality which would prevent further decline over 20 years ... terms). SIR CV Current PL•20 > 0.95 PONAI.20 = 0.5 PGNAI.30~0.95 Stock at Stock 30 years Lower ... distribution at year 20 is the sum of the projected distributions, for the set of current stock states in the ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 467–475 : Autor(es): de la Mare, W.K. and A. Constable
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Some thoughts on precautionary measures for the krill fishery
Paper Title: Some thoughts on precautionary measures for the krill fishery Abstract / Description ... : The concept of precautionary measures for krill is discussed. A precautionary catch limit, based on ... the potential yield model developed by the CCAMLR Scientific Committee's Working Group on Krill ... (WG-Krill) is discussed and it is concluded that such a method is appropriate in setting an overall ... developed. A precautionary measure is one that, on an intuitive and pragmatic level, appears 'safe ... the fishery (pristine biomass). 2 Some Thoughts on Precautionary Measures for the Krill Fishery ... limited region close to predator colonies. Arising from this concern has been a quest for an equable way ... a catch limit that would be small enough to provide an acceptable impact on the land-based ...
Science Journal Paper : CCAMLR Science, Volume 3 (CCAMLR Science, Volume 3) : 1–11 : Autor(es): Everson, I. and W.K. de la Mare
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On the power to detect changes using the standard methods for monitoring parameters of predatory species
Paper Title: On the power to detect changes using the standard methods for monitoring parameters ... of predatory species Abstract / Description: The CCAMLR guidelines (CCAMLR, 1989) for analyzing the ... considered here are insufficient for conducting power analyses (penguin arrival weight A1.1, trend in penguin ... population size A3.1, penguin demography A4.1, penguin fledging weight A7.1). Alternative forms for analyses ... on two years or five years of monitoring (though for detecting a trend, the number of years will be ... suggestion that members compute estimates of required sample sizes for both two and five years of monitoring ... ) to compute the requisite sample sizes for detecting changes of 10%, 20% and 30% of the mean value ... sample sizes for detecting changes of 10%, 20% and 30% of the mean values are shown in Table 2. No ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/6 (Selected Scientific Papers, SC-CAMLR-SSP/6) : 377–397 : Autor(es): Boveng, P. and J.L. Bengtson
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Some comments on the procedure for testing estimators of krill abundance which utilise survey data
Paper Title: Some comments on the procedure for testing estimators of krill abundance which ... provide an encouraging improvement in fits to the distribution of inter-swarm distances observed on the ... correlation, estimators of abundance which attempt to model such effects (such as those based on Kriging ... indeed likely to provide improved performance in practice. Such studies require a simple method for ... The ability of the two-level models considered to mimic an observed spatial distribution pattern for ... WG-KRILL-91/21 SOME COMMENTS ON THE PROCEDURE FOR ... provide an encouraging improvement in fits to the distribution of inter-swarm distances observed on the ... overall abundance and of its variance. For the best possible precision (given a constraint on the survey ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/8 (Selected Scientific Papers, SC-CAMLR-SSP/8) : 191–205 : Autor(es): Butterworth, D.S., D.L. Borchers and D.G.M. Miller