Search results

1. Estimation of effective sample size for catch-at-age and catch-at-length data using simulated data from the Dirichlet-multinomial distribution

   year is important for such assessments, and this issue is studied using simulation. Between-haul ... heterogeneity within fishing year was simulated using samples from the Dirichlet-multinomial (D-M) distribution ... using aggregate year-level frequencies. The other three estimators use the haul-level frequencies ... on the new CV model; and (iii) that based on the PMLE. The year-level method gave very inaccurate estimates ... obtained from the integer values of year, y, so that for a 20-year simulation period y’ = y – 10 ... model A simulation model consisted of simulating 100 replications of a series of 20 fishing years ... from simu- lated sampling of the population age structure. For each of the 20 years in a replicate ... . For simulation Model 3, the selec- tivity parameter λ was varied linearly from 5.88 for the first year of the 20 ...

   Science Journal Paper : CCAMLR Science, Volume 15 (CCAMLR Science, Volume 15) : 115–138 : Author(s): Candy, S.G

2. Biological parameters for icefish (Chionobathyscus dewitti) in the Ross Sea, Antarctica

   340–360 mm total length (TL) and about 3–4 years of age, and that 95% were mature at about 370–400 mm ... TL and 6–8 years of age. Counts of growth zones in sectioned otoliths were used to determine ages ... a significantly larger mean asymptotic maximum size than males. Maximum ages of 8 and 11 years were obtained ... ;360 mm total length (TL) and about 3–4 years of age, and that 95% were mature at about 370&ndash ... ) and about 3–4 years of age, and that 95% were mature at about 370–400 mm TL and 6–8 years of age. Counts ... maximum size than males. Maximum ages of 8 and 11 years were obtained for male and female fish ... from most of the calendar year were therefore lacking, so it was not possible to investigate ... respectively. This is consistent with Artigues et al. (2003) who calculated b estimates of 3.80 and 3.37 ...

   Science Journal Paper : CCAMLR Science, Volume 15 (CCAMLR Science, Volume 15) : 139–165 : Author(s): Sutton, C.P., M.J. Manning, D.W. Stevens and P.M. Marriott

3. Distribution, biomass and characteristics of the Euphausia superba fishery around South Georgia (Subarea 48.3)

   H3MeHQHBOCTH H WHpOKoro ,l{Hana30Ha nOJIYQeHHbIX 3HaQeHHU 6HOMaCCbI, QTO B CBOIO OQepe,l{b npHBO,l{HT ... K HeOnpe,l{eJIeHHOCTH B o~eHKe 6HOMaCCbI KPHJI5I B 3TOM paUOHe. TaKHM 06Pa30M, MO)l{HO 6bIJIO C,l{eJIaTb ... ,l{CTaBHTeJIbHbIX CbeMOK, BbInOJIHeHHbIX B 3TOM paUOHe COBeTCKHMH YQeHbIMH 3a nepHO,l{ C 1974 no 1988 rr ... 6MOMaCCbI KPMJISI peKoMeH~yeTcSI npOBeCTM 60JIee WMpOKMe HCCJIe~OBaHHSI, BKJIIOl..IalO~Me BbIn ... South Georgia (Subarea 48.3) Abstract / Description:  Krill distribution in the South Georgia area and ... many aspects of its variability have been extensively described in scientific literature. A summary of ... recent findings is discussed in this paper. There has been less focus on data concerning krill biomass ... assessments. The existing uncertainty in krill biomass assessment can be largely attributed to high ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 123–147 : Author(s): Latogursky, V.I., R.R. Makarov and L.G. Maklygin

4. Analysis of albatross and petrel distribution within the CCAMLR Convention Area: results from the Global Procellariiform Tracking Database

   for the estimation of distribution during the breeding season for all 20 albatross, petrel and shearwater species ... two colonies, together rep- resenting <1% of the population of this species, and for this reason ... also been identified as varying between years, though analysis suggests that while differences do ... periods that apply to Subarea 48.3 (open 1 May–31 August, closed 1 September–30 April). Assessment ... successful measures to reduce the incidental mortality of seabirds in most of the fisheries within its ... and petrels in the CCAMLR Convention Area to inform the CCAMLR risk-assessment process. Albatross and ... petrel distribution is analysed in terms of its division into FAO areas, subareas, divisions and ... including areas managed by CCSBT, ICCAT, IOTC and WCPFC. Priority gaps in current tracking data are ...

   Science Journal Paper : CCAMLR Science, Volume 13 (CCAMLR Science, Volume 13) : 143–174 : Author(s): BirdLife International (prepared by C. Small and F. Taylor)

5. Alternative methods for determining subarea or local area catch limits for krill in Statistical Area 48

   npOMbICJlOBble ~aHHble 3a npe~bI~y~He ce30Hbl C ~eJlblO yCTaHoBJleHH~ OrpaHHqeHHti Ha BbIJlOB, MO)KHO ... oxapaKTepH30BaTb KaK HMelO~He HH3KHti nOTeH~HaJl 3a~ep~KH B npHMeHeHHH, OHH Bce-TaKH He npHHHMalOT BO BHHMaHHe ... npHMeHeHHH. HH O~Ha H3 aJlbTepHaTHB He Mo~eT 6blTb oxapaKTepH30BaHa KaK 6HOJlOrHQeCKH 060CHOBaHHYlO ... by Article II of the CCAMLR Convention. The probability of adverse impact is affected by our understanding ... Paper Title:  Alternative methods for determining subarea or local area catch limits for krill in ... precautionary catch limit on krill (Euphausia superba) in Statistical Area 48. The measure also implies an ... application in future of precautionary limits to subareas or local areas of this area. Nine alternative ... current fishing patterns; and (vi) the potential for delay in implementing the alternative. An alternative ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/9 (Selected Scientific Papers, SC-CAMLR-SSP/9) : 237–249 : Author(s): Watters, G. and R.P. Hewitt

6. A simulation study of the method of deriving natural mortality rate using data for Champsocephalus gunnari in Subarea 48.3

   npOMbICJIOBOH CMepTHOCTU (onpe,lleJIeHHbIM npu nOMOlQU VPA) U npOMbICJIOBbIM YCUJIUeM. CBo60,llHbIH 4JIeH in ... gunnari B IIO,llpaHOHe 48.3 UCnOJIb30BaHbI ,llJI5.I nO,llTBep)J{,lleHU5.I ~eJIeC006pa3HOCTU onucaHHoro ... by the Working Group on Fish Stock Assessment (WG-FSA) in previous years. In 1990 the same authors confirmed ... composition of the catches, Ca.)!, for a series of years and standardised values of fishing effort Ey ... Champsocephalus gunnari in Subarea 48.3 Abstract / Description:  A method of determining the rate of natural ... been correctly chosen. Data for Champsocephalus gunnari in Subarea 48.3 are used to show that the ... described method is sound. When a mistake is made in the choice of natural mortality coefficient, the ... estimate of the intercept of the regression is other than zero. A bias in the intercept will be positive if ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/8 (Selected Scientific Papers, SC-CAMLR-SSP/8) : 69–83 : Author(s): Gasyukov, P.S. and R.S. Dorovskikh

7. Comparative feeding ecology of Patagonian toothfish (Dissostichus eleginoides) in the southwestern Atlantic

   between 46°-55°S and 60°-64°W, and around South Georgia between 53°-55°30' and 3°-45°W. The South ... continental shelf/slope, the length of D. eleginoides ranged from 30 to 95 cm total length (TL) which ... ;S and 60°-64°W, and around South Georgia between 53°-55°30' and 3°-45° ... continental shelf/slope, the length of D. eleginoides ranged from 30 to 95 cm total length (TL) which ... ' 42'23' 36'30' 45'00' 60'54' 62"15' 60'18' 64'20' 60'19' 62'39' Study Area/Vessel South Georgia ... 42.9 30.5 75.0 1.9 1.9 86.5 100.0 76.2 69.5 100.0 0.8 0.8 20.1 23.8 17.1 25.0 2.9 2.9 22.7 ... 1.64 96.30 1.41 0.17 22.54 98.40 3.50 18.31 98.26 3.20 Males 90.2 1671 6.3 ... W 55.93 55.30 13.20 16.10 15.15 83.42 27.90 29.50 3.30 9.32 8.33 3.08 1.69 1.52 9.32 10.61 0.08 ...

   Science Journal Paper : CCAMLR Science, Volume 4 (CCAMLR Science, Volume 4) : 105–124 : Author(s): García de la Rosa, S.B., F. Sánchez and D. Figueroa

8. Preliminary appraisal of Antarctic fish selection by the 32/36 bottom trawl combined with various codends

   +---------r-----------~------------+_-------- 15 20 25' 30 45 50 55 fish length (TL,cm) Figure 7 Double-layer codend (mesh 120 mm) selectivity ... ~--------+--------- ---!--------- 15 20 25 30 35 40 45 0 j:;"sh Length ITL, qm/ Figure 8 Double-layer codend (mesh 120 mm ... - ~ ~ o 0 0 / / i V I / I 20 25 30 40 50 !is 60 fish length (TL,cm) Double-layer codend (mesh 120 mm) selectivity ogive ... ~+----~~------~----------j-------+ (5 20 25 30 35 40 Its 'So .F;'sh Length (rL, ern) Figure 11 Twine codend (mesh 120 mm) selectivity ... . It was found that the selectivity properties of twine codends are unsatisfactory in the case of ... used in fishing for them requires further research. It should first of all cover twine codends with a ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/4 (Selected Scientific Papers, SC-CAMLR-SSP/4) : 1-48 : Author(s): Zaucha, J.

9. Distribution of fish larvae at South Georgia: horizontal, vertical, and temporal distribution and early life history relevant to monitoring year-class strength and recruitment

   distribution and early life history relevant to monitoring year-class strength and recruitment Abstract ... and early life history relevant to monitoring year-class strength and recruitment ... caught in lower numbers and were most abundant in the upper 20 m (Figure 30). The larger larvae/late ... 54' S20··L-~----~--------~~--------------~~ 36' 30'W S 4 (a) Location ... TO MONITORING YEAR-CLASS STRENGTH AND RECRUITMENT A.W. North (United kingdom) Abstract Four studies ... , VERTICAL, AND TEMPORAL DISTRIBUTION AND EARLY LIFE HISTORY RELEVANT TO MONITORING YEAR-CLASS STRENGTH ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/4 (Selected Scientific Papers, SC-CAMLR-SSP/4) : 105-141 : Author(s): North, A.W.

10. Cephalopod research in the Antarctic

    collection of squid from the vicinity of the South Georgia shelf break. The collection, together ... million tonnes per year respectively, demonstrate the importance of squid in the ecosystem ... of data in turn may be useful, in the future, for predicting year class strength of exploited species ... span is approximately one year; spawning occurs once and is quickly followed by death. Size ... Paper Title:  Cephalopod research in the Antarctic Abstract / Description:  Cephalopods are a ... policy for management of Antarctic cephalopods. In view of the rapidity that cephalopod fisheries can ...

    Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/4 (Selected Scientific Papers, SC-CAMLR-SSP/4) : 323-334 : Author(s): Rodhouse, P.G.

Pages