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Comparison of two methods to assess fish losses due to depredation by killer whales and sperm whales on demersal longlines
from 6 525 longline sets were used to calculate the difference between catch-per-unit-effort (CPUE) of ... approach, which can only be implemented when a sufficient level of by-catch species occurs, provides ... were estimated to range from 27.3% to 29.1% of the total catch (landed and depredated), which is one of ... between catch-per-unit- effort (CPUE) of non-depredated and depredated lines. When killer whales and sperm ... -catch species occurs, provides comparable results and thus strong support for the CPUE method. From ... these two methods, depredation rates were estimated to range from 27.3% to 29.1% of the total catch ... . The amount of depredated fish is part of the total catch and is often disregarded when defining ...
Science Journal Paper : CCAMLR Science, Volume 22 (CCAMLR Science, Volume 22) : 1–14 : Autor(es): Gasco, N., P. Tixier, G. Duhamel and C. Guinet
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An integrated stock assessment for the Patagonian toothfish (Dissostichus eleginoides) for the Heard and McDonald Islands using CASAL
) abundance estimates by length bin, commercial catch-at-length data, standardised CPUE series for the trawl ... , iteratively estimated process error for the catch-at-length data and the inclusion versus exclusion of the tag ... commercial catch CPUE data is given, but incorporation of process error for the RSTS data was not considered ... length bin, commercial catch-at-length data, standardised CPUE series for the trawl grounds, and tag ... , iteratively estimated process error for the catch-at-length data and the inclusion versus exclusion of the ... abundance data and commercial catch CPUE data is given, but incorporation of process error for the RSTS ... multiple fisheries catch- at-length proportions, fisheries-independent re- search survey data (RSTS ...
Science Journal Paper : CCAMLR Science, Volume 15 (CCAMLR Science, Volume 15) : 1–34 : Autor(es): Candy, S.G and A.J. Constable
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Evaluation of the results of trawl selectivity experiments by Poland, Spain and USSR in 1978/79, 1981/82 and 1986/87
different characteristics of experimental codends, length frequency distribution of stocks sampled, catch ... rates and catch composition. Details of these data were analyzed and minimum mesh sizes for several ... different characteristics of experimental codends, length frequency distribution of stocks sampled, catch ... rates and catch composition. Details of these data were analyzed and minimum mesh sizes for several ... fish in the stock sampled, catch rates and catch composition. All these factors may influence the ... in Figure 1 is only a rough estimate. The effect of catch rates on fish selection cannot be ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/6 (Selected Scientific Papers, SC-CAMLR-SSP/6) : 163–196 : Autor(es): Slosarczyk, W., E. Balguerias, K. Shust and S. Iglesias
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Observations of fishing operations on a krill trawler and distributional behaviour of krill off Wilkes Land during the 1985/86 season
fishing areas. While catch per towing time reflects within-swarm density, catch per day was thought to be ... to 10 km with different distributions occurring in different fishing areas. While catch per towing ... time reflects within-swarm density, catch per day was thought to be a good index to measure abundance ... stock but also to monitor and manage the Antarctic ecosystem as a whole. The usefulness of CPUE (catch ... than half the total Japanese catch is used for direct human consumption. processing constraints differ ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/4 (Selected Scientific Papers, SC-CAMLR-SSP/4) : 335-368 : Autor(es): Ichii, T.
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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
estimation of age composition of catch requires that age/length data and random length frequency have been ... composition of catch for Dissostichus eleginoides was obtained with the application of a single age/length key ... estimation of age composition of catch requires that age/length data and random length frequency have been ... composition of catch for Dissostichus eZeginoides was obtained with the application of a single age/length ...
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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The fishery for Patagonotothen brevicauda guntheri in CCAMLR Subarea 48.3
they would also catch undersized individuals of other, larger species. Survey results suggest that such ... -catch of other fisheries; this suggests that illegal nets were used. File: 16-Everson-and-Mitchell.pdf ... . guntheri means that they can only be caught with net meshes so small that they would also catch undersized ... significant effect on other species. P.b. guntheri has been reported as a by-catch of other fisheries; this ... 12NII which limited the total catch for the season to 13 000 tonnes. In the following year the total ... allowable catch (TAC) was set at 12000 tonnes (Conservation Measure 16NIII). At the end of the fishing ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 275–283 : Autor(es): Everson, I. and C. Mitchell
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The 1991/92 fishery for Dissostichus eleginoides in Subarea 48.3
Chilean vessels. The maximum catch taken in a five-day period was 375 tonnes. Catch rate was not ... tonnes was taken by one Bulgarian, five Russian and eight Chilean vessels. The maximum catch taken in a ... five-day period was 375 tonnes. Catch rate was not influenced by fishing depth, time of day or soak ... ceased fishing on 24 March. The maximum catch taken in a five-day period was 375 tonnes (Figure 1 ... , and as shown in Table 1 for Chile. 1.1 Data Sources Catch and effort data were reported by five ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/9 (Selected Scientific Papers, SC-CAMLR-SSP/9) : 31–48 : Autor(es): Agnew, D.J. and C.A. Moreno
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A simulation study of krill fishing by an individual Japanese trawler
proportional biomass decrease. Catch statistics collected at present (centred primarily on catch per fishing ... time) are of low utility in detecting biomass decline. Combination catch rate indices incorporating ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I (Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I) : 1–108 : Autor(es): Butterworth, D.S.
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A fine-scale model of the overlap between penguin foraging demands and the krill fishery in the South Shetland Islands and Antarctic Peninsula
using the total catch of krill taken within 100 km of penguin colonies in their breeding season ... the krill resource and is based on a detailed model of penguin foraging patterns combined with catch ... , Australia Abstract CCAMLR has been using the total catch of krill taken within 100 km of penguin ... that 75 to 90% of the total catch for the subarea was taken between December and March within 100 km ... catch taken within this 'critical period-distance' as an indicator of the potential overlap between ... catch may be taken within the foraging distance of land-based colonies, those colonies containing the ...
Science Journal Paper : CCAMLR Science, Volume 2 (CCAMLR Science, Volume 2) : 99–110 : Autor(es): Agnew, D.J. and G. Phegan
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Seabird interactions with longlining operations for Dissostichus eleginoides at the South Sandwich Islands and South Georgia
involving the setting and hauling of longlines to catch the toothfish Dissostichus eleginoides around the ... and observations of longline vessels fishing around South Georgia, however, indicate significant catch ... days of operations involving the setting and hauling of longlines to catch the toothfish Dissostickus ... , however, indicate significant catch rates of albatrosses. Resume Les interactions reelles et ... ) repor ted a catch ra te of 0.41 seabirds/thousand hooks in the southern bluefin t u n a longline f ... point out to 500 m astern of the vessel. In encounters over offal or discarded by-catch, a hierarchy ...
Science Journal Paper : CCAMLR Science, Volume 1 (CCAMLR Science, Volume 1) : 143–153 : Autor(es): Ashford, J.R., J.P. Croxall, P.S. Rubilar and C.A. Moreno