Résultats de la recherche
-
LENGTH-BASED ASSESSMENT FOR MACKEREL ICEFISH (CHAMPSOCEPHALUS GUNNARI) IN SUB-AREA 48.3
accurate identification of age cohorts from the survey data. In this paper we describe a length‐based ... the survey data which, in conjunction with the bootstrapped survey biomass data, yields an estimate of ... ) in sub‐area 48.3 employs the CMIX and GYM packages, which derives population numbers‐at‐age and ... approach that removes the problem of cohort determination. A stratified bootstrap technique (consistent ...
Meeting Document : WG-FSA-09/27 : Auteur(s): R.M. Hillary (Australia), C.T.T. Edwards, R.E. Mitchel and D.J. Agnew (United Kingdom)
-
Uncertainty in echosounder calibrations
Abstract: Calibration of echo sounders for fish stock assessment are commonly performed using the ... standard sphere method (Johannesson and Mitson, 1983; Simmonds et al., 1984). To determine the accuracy of ... the method, direct measurements of target strength (TS) were made of three standard spheres (Copper ... (Cu)- 23.0 mm and tungsten carbide (WC)- 33.0 mm and 38.1 mm). At the best case range of 5 m, the TS ...
Meeting Document : WG-EMM-96/40 : Auteur(s): Soule, M.A., Demer, D.A.
-
Total mercury and methylmercury concentrations in Antarctic toothfish (Dissostichus mawsoni): Health risk assessment
Abstract: In the present study, the concentrations of total mercury in different organs of the ... concentrations of 0.165 ± 0.095 mg/kg (0.023–0.454 mg/kg) in the Antarctic toothfish. In fish muscle ... , methylmercury accounted for approximately 40% of the total mercury. In a comparison analysis, muscle and liver ... Division 58.4.1 off the coast of Antarctica were determined. The results revealed total mercury ...
Meeting Document : WG-FSA-17/P02 : Auteur(s): M. Yoon, M.-R. Jo, K.-T. Son, W.-S. Choi, S. I. Kang, S.-G. Choi, J. H. Lee and T. S. Lee
-
Principles for evaluating data collection plans in data-poor exploratory fisheries
in accordance with the principles set forth in Article II of the Convention. However, several times ... over the last five years the Scientific Committee has noted with concern the lack of progress in ... of fishing increases the risk of over-exploitation of fish stocks. In this paper we articulate a set ... of principles to assist the Scientific Committee with developing a framework for research in data ...
Meeting Document : WG-SAM-11/08 : Auteur(s): P.E. Ziegler, D.C. Welsford and A.J. Constable (Australia)
-
Habitat partitioning in Antarctic krill: spawning hotspots and nursery areas
early to late part of the austral season, juvenile distribution moves from ocean to shelf, opposite in ... whether “hotspots” of egg production and early stage nursery occurred, and secondly whether the available ... -frequency databases. Although adult males and females of spawning age were widely distributed, the ... distribution of eggs, nauplii and metanauplii indicates that spawning is most intense over the shelf and shelf ...
Meeting Document : WG-EMM-2019/20 : Auteur(s): F. Perry, A. Atkinson, S.F. Sailley, G.A. Tarling, S.L. Hill, C.H. Lucas and D.J. Mayor
-
Data on krill (Euphausia superba Dana) consumption by coastal fishes in Division 58.4.2 (Kosmonavtov and Sodruzhestva Seas)
taking into account their distribution in the particular study area of Antarctica. Total fish stock was ... is 551 300 tonnes, fish will consume 960 000 tonnes of krill. Given the total krill biomass in the ... 58.4.2 (Kosmonavtov and Sodruzhestva Seas) Abstract / Description: Current estimates of the level of ... then been extrapolated over all of Antarctica. According to these calculations the entire amount of ... relationships are used in this work. The mean krill stock size in the Sodruzhestva Sea (to the south of 65°30'S ... the drop in feeding rates (mean index of stomach fullness was from 2.0 to 6.9%) and a switch from E ... ., 1985). Assessments contained in this paper are based on results of research conducted in the ... account their distribution in the particular study area of Antarctica. Total fish stock was calculated ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/8 (Selected Scientific Papers, SC-CAMLR-SSP/8) : 305–319 : Auteur(s): Pakhomov, Y.A., V.A. Bibik and V.V. Gerasimchuk
-
A nonparametric algorithm to model movement between polygon subdomains in a spatially explicit ecosystem model
part of the modelling effort. In marine applications, a flow field grid describing the water movement ... are not designed to model movement on the larger scale of polygons, resulting in disproportionately ... usually forms the basis for movement of passive or nearly passive biomass. Grid-based advection algorithms ... effective algorithm to model movement at the polygon level is proposed, preserving the general properties of ...
Meeting Document : WG-EMM-06/35 : Auteur(s): T. Lenser and A. Constable (Australia)
-
A study on calibration for commercial echosounder using bottom backscattering strength in Antarctic
fishing vessel to use it in estimating biomass of Antarctic krill (Euphausia superba). The method of ... calibration was to analyze the difference between the bottom backscattering strength of the commercial ... , was examined to verify the calibration result. The analysis result confirmed the possibility of ... calibration by bottom backscattering strength, since the proportion of krill swarm signals within 2 dB < S ...
Meeting Document : SG-ASAM-17/P01 : Auteur(s): S.-G. Choi, H. Lee, K. Lee and J. Lee
-
Quantifying within- and between-season variability in Adélie penguin fledgling weights: statistical and practical implications for detecting change
Béchervaise Island and use them in a power analysis as a continuation of the CEMP review. The statistical ... fledgling weights with a decline in resource availability, the consideration of total chick failure during ... reducing to 30 the number of birds weighed in a single 5-day period each year. If practical, this outcome ... severe food shortages and a possible change in variance associated with a change in the mean value. With ...
Meeting Document : WG-EMM-05/20 : Auteur(s): L. Emmerson, C. Southwell and J. Clarke (Australia)
-
Adélie penguin breeder abundance in CCAMLR Divisions 58.4.1 and 58.4.2
future krill fisheries in those regions. We present here estimates of the breeding Adélie penguin ... Adelie penguins were attempting to breed at the time of the surveys in Divisions 58.4.1 and 58.4.2. This ... estimate is substantially higher than the previously available estimate in Woehler (1993) of 767,000 ... predators of the Southern Ocean including ice-breeding seals, fur seals, penguins and flying seabirds. The ...
Meeting Document : WG-EMM-13/09 : Auteur(s): C. Southwell, J. McKinlay, L. Emmerson (Australia), A. Takahashi (Japan), C. Barbraud, K. DeLord and H. Weimerskirch (France)