Résultats de la recherche
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Changes in the fish biomass around Elephant Island (Subarea 48.1) from 1976 to 1996
. gunnari stocks remained at a low level. The status of N. rossii is still unclear, although some recovery ... little prospect at present of re-opening the fishery around Elephant Island. File: 09kock.pdf ... from 1978/79 to 1988/89, with most of the commercial harvesting taking place in the first two years of ... the fishery. Results of bottom trawl surveys conducted by Germany in the vicinity of Elephant Island ... apparently recovered to a large extent by the second half of the 1980s, while C. gunnavi stocks remained at ... exploited on a localised fishing ground northeast of Joinville Island at the tip of the Antarctic ... shelf around Elephant Island at depths of 50 to 550 m from 1981 to 1996 (Table 2). The surveys were ... the course of a tow at a towing speed of approximately 4 knots. Mean horizontal openings between the ...
Science Journal Paper : CCAMLR Science, Volume 5 (CCAMLR Science, Volume 5) : 165–189 : Auteur(s): Kock, K.-H
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CCAMLR ecosystem monitoring and management: future work
: Harvesting of marine living resources in the Southern Ocean is managed by the Commission for the Conservation ... of Antarctic Marine Living Resources (CCAMLR). CCAMLR is widely known for its ecosystem approach to ... managing fisheries with the maintenance of ecological relationships included in the conservation objectives ... . In the late 1980s, CCAMLR’s precautionary approach was developed, incorporating principles of how to ... a Target Population Environment Predators Prey Other Catch Estimation of Status D at a D at ... it h ef fe ct s of c ha ng es in pr ey o n pr ed at or s an d th e co nv er ... al fo rc in g of p re y d yn am ic s D at a us ed E st im at ed p ar am et er ... s ca n be u se d So m e fi tt in g of m od el s to es ti m at ed p ar am ...
Science Journal Paper : CCAMLR Science, Volume 9 (CCAMLR Science, Volume 9) : 233–253 : Auteur(s): Constable, A.J
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A proposed management procedure for the toothfish (Dissostichus eleginoides) resource in the Prince Edward Islands vicinity
-recruitment curve steepness h is low. These tests also indicate that monitoring of future catch-at-length ... ) resource in the Prince Edward Islands vicinity Abstract / Description: The status of the toothfish ... , whereas catch-at-length information indicates that past catches have had relatively little impact on ... future TACs in the face of this appreciable uncertainty. Four Operating Models (OMs) reflecting ... curve steepness h is low. These tests also indicate that monitoring of future catch-at-length ... attempt at an assessment of the tooth- fish resource in the Prince Edward Islands region through the use ... percent of its pre-exploitation level. Brandão et al. (2002b) extended the ASPM to incorporate catch-at ... eliminated some of either the earlier CPUE data and/or the earlier catch-at-length data, so that the ...
Science Journal Paper : CCAMLR Science, Volume 16 (CCAMLR Science, Volume 16) : 33–69 : Auteur(s): Brandão, A. and D.S. Butterworth
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Surface water circulation in krill fishing areas near the South Shetland Islands
with a drogue attached at a depth of 30 m to assess flow patterns at the depth range where krill tended ... deployed in shelf and oceanic waters to the north of the South Shetland Islands. Each buoy was deployed ... buoy tracks, the surface circulation to the north of the South Shetlands shelf was described as a slow ... sluggish southwest current with a series of small-scale circular and semi-circular flows in the shelf ... at a depth of 30 m to assess flow patterns at the depth range where krill tended to be most abundant ... ; cylindrical type - length 8.6 m, diameter 0.94 m in 1994/95) at a depth of 30 m to assess flow pattern at ... merged into large swarms at 58-59's along 49"W, which happens to be on the route of the oceanic ... . Naganobu National Research Institute of Far Seas Fisheries 5-7-1, Orido, Shimizu, 424 Japan Abstract ...
Science Journal Paper : CCAMLR Science, Volume 3 (CCAMLR Science, Volume 3) : 125–136 : Auteur(s): Ichii, T. and M. Naganobu
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Assessment and tag program adaption methods for exploratory fisheries in the CAMLR Convention Area: an example application for Division 58.4.3a
initial stock assessment and adaption of catch limits and tagging rates is presented for new and ... catch-at-length/age data and tagging data at-length/age. A simple algorithm, based upon the Petersen ... tagging levels that will produce an expected abundance estimate in the following year of a given precision ... whilst ensuring the sustainable exploitation of the stock as per the CCAMLR management procedure. The ... using the relevant tag mortality parameter. The shedding rate, TS, is a function of the time-at ... in Seber (1982). For a given number of tag-releases, the CV in abundance is at a maximum at zero ... observed number of tags would be very close to being fished-out, at least for certain param- eter draws ... chance at all in obtaining a reli- able estimate of r from the data alone. Normally, the r parameter is ...
Science Journal Paper : CCAMLR Science, Volume 16 (CCAMLR Science, Volume 16) : 101–113 : Auteur(s): Hillary, R.M
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Integrating Count Effort by Seasonally Correcting Animal Population Estimates (ICESCAPE): a method for estimating abundance and its uncertainty from count data using Adélie penguins as a case study
series are typically collected at only a limited number of sites, so surrogate availability information ... , the method is applied to several examples of published studies of Adélie penguin abundance at breeding ... animal count data to a common reference point of breeding chronology for species with a complex temporal ... function of sampling availability. ICESCAPE (Integrating Count Effort by Seasonally Correcting Animal ... . Such time series are typically collected at only a limited number of sites, so surrogate availability ... , the method is applied to several examples of published studies of Adélie penguin abundance at ... variable. The numbers of breeding Adélie penguins, nests and chicks present at a site are known to vary ... . The former are typified by one-off counts collected from a relatively large number of sites at times ...
Science Journal Paper : CCAMLR Science, Volume 17 (CCAMLR Science, Volume 17) : 213–227 : Auteur(s): McKinlay, J., C. Southwell and R. Trebilco
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Preliminary study on nesting Adélie penguins disturbance by unmanned aerial vehicles
Abstract / Description: The importance of unmanned aerial vehicles (UAVs) in remote sensing is rapidly ... potential effects of wildlife disturbance by fixed-wing UAVs are investigated. In austral summer 2014/15 ... , UAV overflights were conducted in the Adelié penguin (Pygoscelis adeliae) breeding colony at Point ... . Thomas (Western Shore of Admiralty Bay, King George Island, Antarctica, Subarea 48.1). The impacts of ... conducted in the Adelié penguin (Pygoscelis adeliae) breeding colony at Point. Thomas (Western Shore of ... images at a lower cost than manned airplanes or satellites, and, therefore, offer ecologists a way of ... were done at the altitude of 350 m AGL. Take-offs and landings were from Arctowski Station, approx ... near their nest or at their neighbours. Type V – escape – birds abandoning nests. The number of ...
Science Journal Paper : CCAMLR Science, Volume 23 (CCAMLR Science, Volume 23) : 1–16 : Auteur(s): Korczak-Abshire, M., A. Kidawa, A. Zmarz, R. Storvold, S.R. Karlsen, M. Rodzewicz, K. Chwedorzewska and A. Znój
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1989/90 stock status and TAC assessment for Champsocephalus gunnari in Subarea 48.3 (South Georgia)
) using standardized fishing effort. For the beginning of the 1989/90 fishing season, the stock was ... assessed at 130.2 thousand tonnes and the TAC at 23.6 thousand tonnes. File: 02-Frolkina-and-Gasyukov.pdf ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/6 (Selected Scientific Papers, SC-CAMLR-SSP/6) : 15–27 : Auteur(s): Frolkina, Zh.A. and P. Gasyukov
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An integrated stock assessment for the Patagonian toothfish (Dissostichus eleginoides) for the Heard and McDonald Islands using CASAL
, iteratively estimated process error for the catch-at-length data and the inclusion versus exclusion of the tag ... Division 58.5.2), using CASAL and data consisting of multi-year random stratified trawl survey (RSTS ... ) abundance estimates by length bin, commercial catch-at-length data, standardised CPUE series for the trawl ... representative of the main plateau, where juvenile fish are found, but are of relatively low intensity in effort ... , iteratively estimated process error for the catch-at-length data and the inclusion versus exclusion of the ... Constable 4 method of determining effective sample size (ESS) for commercial catch-at-length data as ... ) reported that this method, when compared to simulations of between-haul heterogeneity in proportions-at ... for process error in catch-at-length data taking into account systematic lack-of-fit (SLOF) using a ...
Science Journal Paper : CCAMLR Science, Volume 15 (CCAMLR Science, Volume 15) : 1–34 : Auteur(s): Candy, S.G and A.J. Constable
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The Kerguelen database
and biological data for the Kerguelen EEZ has been operating in France since 1979. At the end of the ... representation of these data is presented for several parameters including a distribution of the fishing effort ... , position of individual trawls, total catches and catch per species. Four species (Champsocephalus gunnari ... , Notothenia squamifrons, N. rossii and Dissostichus eleginoides) represent about 99% of the total catches ... been operating in France since 1979. At the end of the 1984/85 fishing season, the data from 25445 ... . At the end of the split-year 1985/86 25445, trawlings have been registered in a database. The LFD ... modify the value of CPUE if the same cohort is followed. The length at first maturity is 25 cm. This ... . The actual mean length is less than the length at first maturity. The values of CPUE do not reflect ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/3 (Selected Scientific Papers, SC-CAMLR-SSP/3) : 23-54 : Auteur(s): Duhamel, G.