Search results
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Analysis and modelling of the Soviet Southern Ocean krill fleet, II: Estimating the number of concentrations and analytical justification for search data
the records in each concentration, we can construct the east-west extent and north-south extent ... the east-west and north-south extent. The simplest estimate for the radius of the concentration ... concentrations and the spatial extent of concentrations. The east-west extent of concentration i in data set ... for the entire fishing period of14 to 30 days.) 290 9. A MORE DETAILED ANALYSIS OF THE DATA FROM RV MYS ... Paper Title: Analysis and modelling of the Soviet Southern Ocean krill fleet, II: Estimating the ... number of concentrations and analytical justification for search data Abstract / Description: In this ... of concentrations of krill (Butterworth, 1988; Mangel, 1988) in a given region of the Southern Ocean ... make accurate inferences. In the appendix, a method for correcting for the bias in the detection of ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/6 (Selected Scientific Papers, SC-CAMLR-SSP/6) : 283–322 : Author(s): Mangel, M.
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A preliminary investigation of the possible effects of rhizocephalan parasitism on the management of the crab fishery around South Georgia
of the parasite is likely to be, but at the one extreme a parasite could live until its host dies. Crabs ... fishing trip targeting crabs in Subarea 48.3, by the FV Pro Surveyor, presented in Otto and MacIntosh ... fishing trip, indicate that very few infected animals are found above the minimum 'commercial' size ... survive, the harvest would only include healthy males. If the infected discards are destroyed or die ... Paper Title: A preliminary investigation of the possible effects of rhizocephalan parasitism on ... the management of the crab fishery around South Georgia Abstract / Description: Relatively high ... levels of infection by a rhizocephalan barnacle have been found in the population of the crab Paralomis ... spinosissima, which has been harvested by a new fishery around South Georgia (Subarea 48.3) since 1992. One of ...
Science Journal Paper : CCAMLR Science, Volume 1 (CCAMLR Science, Volume 1) : 175–192 : Author(s): Basson, M
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Detection and quantitative estimation of krill concentrations by hydroacoustic instruments
which mainly depend on light conditions. During daylight hours, krill usually stay in the middle ... Paper Title: Detection and quantitative estimation of krill concentrations by hydroacoustic ... instruments Abstract / Description: The limited capabilities of existing hydroacoustic instruments in ... detecting dispersed and surface concentrations of krill lead to considerable underestimates of krill biomass ... in areas surveyed. The task of detecting surface concentrations of krill can be solved with the help ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/3 (Selected Scientific Papers, SC-CAMLR-SSP/3) : 123-139 : Author(s): Yudanov, K.I.
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Assessments of the stocks of Notothenia rossii marmorata and Champsocephalus gunnari in the South Georgia area
rn 1970 0.84 0.16 0.76 0.24 1971 0.82 0.19 0.73 0.26 1972 0.84 0.20 0.75 0.28 1973 0.89 0.32 ... Paper Title: Assessments of the stocks of Notothenia rossii marmorata and Champsocephalus gunnari ... in the South Georgia area Abstract / Description: The stocks of Notothenia rossii marmorata and ... estimates from surveys by the FRG. These data indicate that the stock of N. rossii in 1985 was about 2.5% of ... its pre-exploitation biomass, while the stock of Champsocephalus gunnari has fluctuated greatly with ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/3 (Selected Scientific Papers, SC-CAMLR-SSP/3) : 1-21 : Author(s): Cooke, J.G.
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Estimation of effective sample size for catch-at-age and catch-at-length data using simulated data from the Dirichlet-multinomial distribution
that corresponds marginally (i.e. averaged across hauls) to a particular mixed-effect multinomial dis- tribution ... a D-M distri- bution for haul-level frequencies. A possible criticism of the use of the D-M dis- tribution ... as a function of predicted class proportions, pya, assuming a multinomial dis- tribution of yn′ independently ... means its expected value not the randomly drawn value from the Poisson dis- tribution). For all ... Paper Title: Estimation of effective sample size for catch-at-age and catch-at-length data using ... simulated data from the Dirichlet-multinomial distribution Abstract / Description: The incorporation of ... ‘effective sample size’ (ESS) in integrated assessments is an approximate but simple way of modelling the ... distribution of catch-at-age or catch-at-length frequencies using a multinomial likelihood when there is extra ...
Science Journal Paper : CCAMLR Science, Volume 15 (CCAMLR Science, Volume 15) : 115–138 : Author(s): Candy, S.G
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The gentoo penguin as a candidate species for the CCAMLR Ecosystem Monitoring Program
appear to feed chiefly on fish, at least during single foraging trips (Jablonski, 1985; Croxall et al ... , foraging trip duration, demography). 4. ADDmONAL CONSIDERATIONS 4.1 Resident Species Gentoo penguins ... Regions (ISRs) of the CCAMLR Ecosystem Monitoring Program), we suggest (and provide a full bibliography of ... in the CEMP. The extensive dependence of this species in these ISRs on Euphausia superba, (including ... in winter), its residence in the ISRs in winter and its early attainment of sexual maturity are all ... features of special relevance to the CEMP. File: 30-Croxall-and-Williams.pdf ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 483–488 : Author(s): Croxall, J.P. and T.D. Williams
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Distribution, morphology and ecology of Macrourus whitsoni and M. caml (Gadiformes, Macrouridae) in the Ross Sea region
, J. Brown and J. Vorster. 2008. Trophic study of Ross Sea Antarctic toothfish (Dis sostichus mawsoni ... , Slope and East strata, with a spatial distribution similar to that of other samples used in this study ... was conducted at shallower depths on the continental slope, and deeper depths in the east, so effects ... stratum, moved to the Shelf and then finished in the East so that changes in gonad stage by region ... Paper Title: Distribution, morphology and ecology of Macrourus whitsoni and M. caml (Gadiformes ... identification of a new species of Southern Ocean grenadier, Macrourus caml, which had hitherto been identified ... as M. whitsoni. The first comparison of the distribution and ecology of the two species of Macrourus ... in the Ross Sea region is presented. The number of rays in the left pelvic fin and number of rows of ...
Science Journal Paper : CCAMLR Science, Volume 20 (CCAMLR Science, Volume 20) : 37–61 : Author(s): Pinkerton, M.H., P. McMillan, J. Forman, P. Marriott, P. Horn, S. Bury and J. Brown
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A comparison between otoliths and scales for use in estimating the age of Dissostichus eleginoides from South Georgia
determination in Antarctic fish. In: Di Prisco, G., B. Maresca and B. Tota (Eds). Biology of A n tarctic Fish ... c t r u r b r s a T e n n M M nnx Di,ssostich~,s elegirzoicler 1.13 p a i i o ~ a K)rn~or"i r e o p r m i . Ta6n ... . I (a): n p ~ ~ e p n o A c v e T a ~ 0 3 p a c ~ a no n o n e p e Y H o M y cpe3y O T o n M T a Di,~sostichu.s elegiizoides, ~ c n o n b s y n KPHTePAM XYPO M 03y@-Koc~a (1980 ... considerably lower, leading to a more conservative management strategy. However the loss of wholesale value ... Paper Title: A comparison between otoliths and scales for use in estimating the age of ... understanding the population dynamics and productivity of a fish stock. The use of scales to estimate age can ... result in large errors in age data for long-lived species, usually due to compression of scale circuli ... whose age has been estimated using both scales and otoliths. We estimated the age of D. eleginoides ...
Science Journal Paper : CCAMLR Science, Volume 8 (CCAMLR Science, Volume 8) : 75–92 : Author(s): Ashford, J.R., S. Wischniowski, C. Jones, S. Bobko and I. Everson
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Maximum entropy reconstructions of krill distribution and estimates of krill density from acoustic surveys at South Georgia, 1996–2000
g m-2 in the west and 159 to 11 g m-2 in the east; see Table 1), there is evidence of some consistent features ... , in the east, for all three years when data are available, a cluster is visible at approximately x = 95 km ... 28.75 35.70 9.22 8.51 -1139 JR11 1996 East 40.57 13.40 9.02 54.94 30.17 10.00 -1040 JR17 1997 West ... 25.17 18.44 17.06 19.9 6.88 13.19 ------- JR17 1997 East 54.65 36.55 11.06 51.26 13.39 7.14 -1869 JR28 ... Paper Title: Maximum entropy reconstructions of krill distribution and estimates of krill density ... Entropy (MaxEnt) reconstructions of krill distribution and estimates of mean krill density within two ... survey boxes (dimensions 80 km × 100 km) north of South Georgia. The reconstructions were generated from ... . Krill densities had previously been determined at approximately 0.5 km intervals along each of the ten ...
Science Journal Paper : CCAMLR Science, Volume 10 (CCAMLR Science, Volume 10) : 91–100 : Author(s): Wafy, M.H., A.S. Brierley, S.F. Gull and J.L. Watkins
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Age, growth and size at sexual maturity of Macrourus carinatus caught as by-catch in Australian sub-Antarctic trawl fisheries
obtained during two commercial trawl fi shing trips to Macquarie Island in January 1999 and June 2000 ... 1993, and a commercial trawl fi shing trip to Heard and McDonald Islands in September/October 2000 ... shing trip to Heard and McDonald Islands in September/October 2000. The fi sh were measured for total ... Paper Title: Age, growth and size at sexual maturity of Macrourus carinatus caught as by-catch in ... Australian sub-Antarctic trawl fisheries Abstract / Description: Estimates of age and growth were obtained ... McDonald Islands (Division 58.5.2) in 1992 and 1993. The range of estimated ages was 4 to 25 years. There ... maturity of M. carinatus was determined from 162 specimens collected during commercial trawl fishing ...
Science Journal Paper : CCAMLR Science, Volume 10 (CCAMLR Science, Volume 10) : 139–151 : Author(s): van Wijk, E.M., R. Williams and A.J. Constable