Résultats de la recherche

1. Using ecosystem monitoring data to detect impacts

   purpose of ecosystem monitoring programs is to indicate the state of ecosystems and whether they have been ... impacted by activities such as fishing. This paper discusses a range of methods for inferring such impacts ... using monitoring data with no control sites. These methods assess either (i) the expected probability of ... an observed value in an unimpacted system, or (ii) the frequency of values below a fixed reference ... United Kingdom Email – sih@bas.ac.uk Abstract The purpose of ecosystem monitoring programs is to ... indicate the state of ecosystems and whether they have been impacted by activities such as fishing. This ... paper discusses a range of methods for inferring such impacts using monitoring data with no control ... sites. These methods assess either (i) the expected probability of an observed value in an unimpacted ...

   Science Journal Paper : CCAMLR Science, Volume 17 (CCAMLR Science, Volume 17) : 197–212 : Auteur(s): Hill, S.L., J. Forcada, P.N. Trathan and C.M. Waluda

2. Marine debris and fishing gear associated with seabirds at sub-Antarctic Marion island, 1996/97 and 1997/98: in relation to longline fishing activity

   TO LONGLINE FISHING ACTIVITY D.C. Nel and J.L. Nel Percy FitzPatrick Institute of African ... Ornithology University of Cape Town Rondebosch 7701, South Africa Abstract Marine debris found in ... de 1996197 y 1997198. La tasa de aumento de 10s artes de pesca encontrados entre los desechos ... . Se encontraron sesenta 'lazos corredizos' del tipo utilizado para suspender a los bacalaos de ...

   Science Journal Paper : CCAMLR Science, Volume 6 (CCAMLR Science, Volume 6) : 85–96 : Auteur(s): Nel, D.C. and J.L. Nel

3. Do krill and salps compete? Contrary evidence from the krill fisheries

   Peninsula. Interannual and seasonal variability of the timing, duration and intensity of salp blooms and the ... presence of green krill were analysed. No relationship between salp density and the proportion of green ... area, the proportion of green krill was high only when salp density was extremely low. However, no ... National Research Institute of Far Seas Fisheries 5-7-1 Orido, Shimizu, Shizuoka, Japan 424 W. K. de la ... . Interannual and seasonal variability of the timing, duration and intensity of salp blooms and the presence of ... green krill were analysed. No relationship between salp density and the proportion of green krill in ... , the proportion of green krill was high only when salp density was extremely low. However, no clear ...

   Science Journal Paper : CCAMLR Science, Volume 5 (CCAMLR Science, Volume 5) : 205–216 : Auteur(s): Kawaguchi, S., T. Ichii, M. Naganobu and W.K. de la Mare

4. Additional data on anti-Brucella antibodies in Arctocephalus gazella from Cape Shirreff, Livingston Island, Antarctica

   Shirreff, Livingston Island, Antarctica Abstract / Description:  The first instance of anti-Brucella ... detected in one sample with the RB test, and in five of the 86 samples (5.8%) using the c-ELISA test. These ... results present serological evidence of Brucella infection in A. gazella. We suggest the utility of extra ... marine mammals. We highlight the importance of evaluating in the CCAMLR Working Group on Ecosystem ... instance of anti-Bvz~celln antibodies in the Southern Hemisphere was recorded in two pinniped species from ... Bvucelln spp. were detected in one sample with the RB test, and in five of the 86 samples (5.8%) using the ... c-ELISA test. These results present serological evidence of Brzrcelln infection in A. gnzelln. We ... suggest the utility of extra-vascular fluid for this serological research. We recognise the c-ELISA test ...

   Science Journal Paper : CCAMLR Science, Volume 8 (CCAMLR Science, Volume 8) : 147–154 : Auteur(s): Blank, O., P. Retamal, P. Abalos and D. Torres

5. Fish distribution and biomass in the Heard Island zone (Division 58.5.2)

   / Description:  Division 58.5.2 encompasses the southern part of the Kerguelen plateau, and contains Heard ... . In order to assess the potential of this area for commercial fishing, and to obtain some preliminary ... distribution, abundance and biology of the most important species, covering a number of years and seasons. Five ... species were found to be abundant. There were two consistent areas of aggregation of Champsocephalus ... because of great loss of time due to bad weather. Summer 1992 10 (9) 10 (11) 10 (10) 5 (6) 10 ... encompasses the southern part of the Kerguelen plateau, and contains Heard Island and the McDonald Islands ... potential of this area for commercial fishing, and to obtain some preliminary data for its management ... of the most important species, covering a number of years and seasons. Five species were found to be ...

   Science Journal Paper : CCAMLR Science, Volume 2 (CCAMLR Science, Volume 2) : 1–20 : Auteur(s): Williams, R. and W.K. de la Mare

6. 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 ... the South to the North-East of the shelf and also to a neighbouring bank (S-W) during the second ... been operating in France since 1979. At the end of the 1984/85 fishing season, the data from 25445 ... trawls had been entered into the database. A graphical representation of these data is presented for ... several parameters including a distribution of the fishing effort, position of individual trawls, total ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/3 (Selected Scientific Papers, SC-CAMLR-SSP/3) : 23-54 : Auteur(s): Duhamel, G.

7. Estimating optimal observer coverage in the Antarctic krill fishery

   / Description:  Data collected as part of the CCAMLR Scheme of International Scientific Observation from ... estimate parameters of interest, in this case the mean (or median) krill length and the rate of larval fish ... : observers have been placed on approximately 50% of vessels fishing in any one season, and have been present ... on board for about 30% of that season. They have achieved a rate of krill sampling equivalent to 18 ... – d.agnew@mrag.co.uk 2 Statistical Services Centre University of Reading Reading RG6 6FN United Kingdom ... Abstract Data collected as part of the CCAMLR Scheme of International Scientific Observation from ... reliably estimate parameters of interest, in this case the mean (or median) krill length and the rate of ... 2002: observers have been placed on approximately 50% of vessels fishing in any one season, and have ...

   Science Journal Paper : CCAMLR Science, Volume 17 (CCAMLR Science, Volume 17) : 139–154 : Auteur(s): Agnew, D.J., P. Grove, T. Peatman, R. Burn and C.T.T. Edwards

8. Modelling catch and effort data using generalised linear models, the Tweedie distribution, random vessel effects and random stratum-by-year effects

   CCAMLR areas is to model the haul-by-haul ratios of catch to effort as the response variable in a ... generalised linear model (GLM) with a square-root link function and a unit variance function. A time series of ... ) estimated using a profile extended quasi-likelihood, and a log link function with log of effort as an offset ... model (GLMM), in order to provide more efficient estimates of the standardised CPUE time series and more ... loss of less than q degrees of freedom. In addition, û is estimated in a separate step of the GLMM ... eleginoides) for CCAMLR areas is to model the haul-by-haul ratios of catch to effort as the response variable ... time series of standardised CPUE estimates and their precision can be obtained from the ‘fi shing year ... parameter (λ) estimated using a profi le extended quasi-likelihood, and a log link function with log of ...

   Science Journal Paper : CCAMLR Science, Volume 11 (CCAMLR Science, Volume 11) : 59–80 : Auteur(s): Candy, S.G

9. Towards an initial operational management procedure for the krill fishery in Subareas 48.1, 48.2 and 48.3

   (Euphausia superba) in Subareas 48.1, 48.2 and 48.3 requires a basis for the assessment of resource status ... , and an algorithm for specifying the levels of regulatory mechanisms (e.g., a catch control law) that ... depends on the results of the assessment. The development and selection of a procedure requires a basis ... for the simulation testing of procedures, and an operational definition of CCAMLR Article II to ... International Commission for the South East Atlantic Fisheries (ICSEAF) has recently designed a series of ... 48.3 requires a basis for the assessment of resource status, and an algorithm for specifying the ... levels of regulatory mechanisms (e.g., a catch control law) that depends on the results of the ... assessment. The development and selection of a procedure requires a basis for the simulation testing of ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 189–219 : Auteur(s): Butterworth, D.S.

10. An integrated stock assessment for the Patagonian toothfish (Dissostichus eleginoides) for the Heard and McDonald Islands using CASAL

    Division 58.5.2), using CASAL and data consisting of multi-year random stratified trawl survey (RSTS ... representative of the main plateau, where juvenile fish are found, but are of relatively low intensity in effort ... , consisting of three main grounds. The model implemented in CASAL is a simple, single-sex, single-area ... functions for each ground by gear (trawl and longline) combination. Various combinations of dataset ... probability by fishery and season for recaptured tagged fish, estimation of tag- loss rates for dart tags ... mcdonAld ISlAndS uSIng cASAl S.G. Candy and A.J. Constable Department of the Environment, Water ... CASAL and data consisting of multi-year random stratified trawl survey (RSTS) abundance estimates by ... releases and recoveries by length bin, is described. The annual surveys are spatially representative of ...

    Science Journal Paper : CCAMLR Science, Volume 15 (CCAMLR Science, Volume 15) : 1–34 : Auteur(s): Candy, S.G and A.J. Constable

Pages