Search results
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Analysis of results from demersal fish surveys at South Georgia, undertaken by the United Kingdom and the USSR, January and February 1990
. These data included station lists and positions, catch and sample data. No age data were available because ... sampled to provide the length, age, weight and maturity stage composition for each species. References ... B 53.68 37.58 B 53.70 37.08 * B 53.65 37.23 ** C 53.89 37.27 53 30 36 0 B 53.90 36.20 B 53.90 36.27 ... (30) 0 0 D. eleginoides 335 (39) 3020* (33) 9631 (55) 1693 (21) P.b. guntheri 0 0 13 608 (90) 1918 ... these large hauls were considered in the analysis. No ideal method was found for incorporating the large ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 223–254 : Author(s): (Report of a Joint UK/USSR Workshop, 23 to 27 July 1990)
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Changes in biomass of eight species of finfish around the South Orkney Islands (Subarea 48.2) from three bottom trawl surveys
the South Orkney Islands (Subarea 48.2) suffered substantial declines from split-year 1977/78 to 1989/90 ... declines from split-year 1977/78 to 1989/90. The biomass of several species of finfish has been monitored ... (Subarea 48.2) suffered substantial declines from split-year 1977/78 to 1989/90. The biomass of several ... . The target time for a haul was 30 minutes, with any haul less than 20 minutes considered invalid ... abundance of a species is always increasing when one or two strong year classes are passing through ... ;;; 6 4 2 0 10 20 30 40 50 60 10 20 30 40 50 60 70 Length (cm) Length (cm) Figure 6: Length-frequency ...
Science Journal Paper : CCAMLR Science, Volume 7 (CCAMLR Science, Volume 7) : 53–74 : Author(s): Jones, C.D., K.-H. Kock and E. Balguerías
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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
of the age-structured model in predicting class/bin by year frequencies is used to obtain a single, across ... Paper Title: Estimation of effective sample size for catch-at-age and catch-at-length data using ... the distribution of catch-at-age or catch-at-length frequencies using a multinomial likelihood when there is extra ... , with marginal class probabilities generated using a simple age-structured model incorporating fishing ... from simu- lated sampling of the population age structure. For each of the 20 years in a replicate ... , the lack of fit of the age- structured model in predicting class/bin by year frequencies is used to obtain ... vessel and year. Further, CASAL requires the catch-at-age or catch-at-length data to be input ... the number of fish sampled from age class a for year y, aggre- gated across all hauls (j = 1,…,hy) in year ...
Science Journal Paper : CCAMLR Science, Volume 15 (CCAMLR Science, Volume 15) : 115–138 : Author(s): Candy, S.G
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Can we use discriminant function analysis to sex penguins prior to calculating an index of a morphometric characteristic?
of birds with greater than 80% success, the difference between the true and apparent mean is likely ... a discriminant function with greater than 80% success may be used to derive statistically robust estimates ... Type I and Type II errors. Lack of knowledge about the sex ratio between years makes combining the data ... are able to correctly determine the sex of birds with greater than 80% success, the difference between ... 1.31 3.91 359 1.21 35 0.63 11 1.04 85.00 1.04 1.44 4.07 388 1.30 41 0.68 13 1.28 90.00 1.28 1.63 4.30 ... discriminant functions are able to correctly determine the sex of birds with greater than 80% success ... are sampled. Therefore, under most normal sampling regimes a discriminant function with greater than 80 ... of knowledge about the sex ratio between years makes combining the data a very doubtful procedure and use ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/9 (Selected Scientific Papers, SC-CAMLR-SSP/9) : 259–272 : Author(s): Agnew, D.J.
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Intra-annual variability in the density of Antarctic krill (Euphausia superba) at South Georgia, 2002–2005: within-year variation provides a new framework for interpreting previous ‘annual’ estimates of krill density
) at South Georgia, 2002–2005: within-year variation provides a new framework for interpreting previous ... all three years, was detected. Krill densities in winter were predominantly low (mean = 18.7 ... g m –2, SD = 24.3), but had risen substantially by summer in each year (mean = 89.5 g m –2, SD = 64.2 ... to explore whether high-frequency temporal variation (i.e. within-year) could have led to the perceived ... -year variation, and examines previ- ously published interannual estimates of krill den- sity (arising ... , CCAMLR Saunders et al. 30 summer) in the light of repeated observations of within-year changes ... 30 0 19 6 30 –1 82 × 13 00 20 3 20 –1 89 × 2 19 / 02 –2 8/ 04 / 03 30 0 19 8 32 –1 84 ... 7 21 –2 13 × 5 14 / 01 –2 4/ 03 / 04 30 0 19 8 32 –1 84 × 13 00 22 6 20 –2 12 × 6 26 ...
Science Journal Paper : CCAMLR Science, Volume 14 (CCAMLR Science, Volume 14) : 27–41 : Author(s): Saunders, R.A., A.S. Brierley, J.L. Watkins, K. Reid, E.J. Murphy, P. Enderlein and D.G. Bone
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Spatial distribution of management measures, Antarctic krill catch and Southern Ocean bioregions: implications for conservation planning
, a biore- gion defined on the basis of long-term (up to 30 years) averages of time series (Grant et al ... across the Convention Area. 0 5 10 15 20 25 30 35 0 2 4 6 8 10 12 14 16 To ta l a re ... evidence, and shall contribute, taking full consideration of Article II of the CAMLR Convention where ... . Margules and Pressey, 2000; Pressey et al., 2007; Ardron et al., CCAMLR Science, Vol. 20 (2013): 1–19 ... Ocean bioregions: implications for conservation planning Abstract / Description: Systematic ... conservation planning for developing marine spatial protection includes analysis of the spatial distribution of ... season, 64% of the CAMLR Convention Area was open to fishing for at least one species. There were ... distribution of catch within the open fraction. For example, only 26% of the total area open to krill fishing ...
Science Journal Paper : CCAMLR Science, Volume 20 (CCAMLR Science, Volume 20) : 1–19 : Author(s): Grant, S.M., S.L. Hill and P.T. Fretwell
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Spatially explicit population dynamics models for Antarctic toothfish in the Ross Sea region
the dynamics of spatial heterogeneity of the population along with age structure, movement and reproductive ... stage transition in a holistic framework. Using this software, three spatially explicit age-structured ... with the results of tagging studies and fits to the other observations (age, reproductive development) were ... of the population along with age structure, movement and reproductive stage transition in a holistic framework ... 15 20 25 30 Age (years) 1.0 0.8 0.6 0.4 0.2 0.0 S el ec tiv ... processes Within each spatial cell, the number of tooth- fish in the population model aged 2 to 30 ... was recorded separately, with a plus group at age 30. Also recorded was the population at each repro- ductive ... -year time steps, plus one instan- taneous time step for aging and the movement of spawners back ...
Science Journal Paper : CCAMLR Science, Volume 21 (CCAMLR Science, Volume 21) : 19–37 : Author(s): Mormede, S., A. Dunn, S. Hanchet and S. Parker
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Champsocephalus gunnari stock status in the South Georgia area
/ Description: ata of age composition and fishing effort for 1976/77-1987/88 were used to analyse stock status ... ata of age composition and fishing effort for 1976/77-1987/88 were used to analyse stock status ... . The recruitment was taken at the lowest possible level for all these years (400 million specimens). Catch-per-unit ... intensity was F 0.1. In the first two cases TAC=25-30 thousand tonnes and stock size does not change ... intensidad de pesca fue FO.1. En los dos primeros casos, la T AG=2S-30 mil toneladas y el tamano de la ... 2 Table 3 Table 4 Table 5 Table 6 Table 7 Table 8 Table Legends Age (years) and weight (gr ... 8 Legendes des tableaux Donnees sur I'age (ans) et le poids (g). Composition en ages des prises ... IN THE SOUTH GEORGIA AREA R. Borodin, P. Kochkin Abstract Data of age composition and fishing effort ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/5 – Part II (Selected Scientific Papers, SC-CAMLR-SSP/5 – Part II) : 1-18 : Author(s): Borodin, R. and P. Kochkin
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Evaluation of the results of trawl selectivity experiments by Poland, Spain and USSR in 1978/79, 1981/82 and 1986/87
size of 108 mm would in turn correspond to the age at first capture of 4 years (Le. around 32 cm ... , to protect immature fish, or 90 mm, to protect first spawners, or 100 mm, to give an age at first capture ... retenus des classes d'age particulieres. Les lignes verticales representent Lso. Relation graphique ... Hour Per Tow (kg) kg % 630.62 90.60 29 295.30 13.20 9 1081.58 518.00 96 536.74 184.00 69 ... in 1978/79, 1981/82 and 1986/87 Abstract / Description: Trawl selectivity for several species of ... rates and catch composition. Details of these data were analyzed and minimum mesh sizes for several ... species were calculated. It is recommended that introduction of these mesh sizes should be considered for ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/6 (Selected Scientific Papers, SC-CAMLR-SSP/6) : 163–196 : Author(s): Slosarczyk, W., E. Balguerias, K. Shust and S. Iglesias
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The ecosystem approach to managing fisheries: achieving conservation objectives for predators of fished species
in that year, B ,,,,,, is the individual mass of the predator at age in that year, G,,,,,, is the age ... -specific growth rate of individuals, R,, , is the number of offspring (age 0) in that year ... of change of N,,,,,, during the year is given by where M(p,n+t) is an age-specific function of natural ... of mass in animals of that age including the basic metabolism, costs of foraging and other factors ... fisheries impact incidentally on an ecosystem, (ii) what should be the conservation objectives for predators ... Paper Title: The ecosystem approach to managing fisheries: achieving conservation objectives for ... in its infancy. A general approach is proposed for maintaining ecological relationships and providing ... for the recovery of depleted populations in food webs supporting fisheries. This paper addresses the ...
Science Journal Paper : CCAMLR Science, Volume 8 (CCAMLR Science, Volume 8) : 37–64 : Author(s): Constable, A.J