Résultats de la recherche
-
A declining trend in the abundance of Notothenia rossii marmorata and Notothenia gibberifrons observed in fjords in two sites in the South Shetland Islands
as significant. The material for the current study was obtained with trammel nets at Potter Cove ... species in relation to Notothenia neglecta, a species with similar ecological habits in the fjords. Since ... material for the current study was obtained with trammel nets at Potter Cove, King George/25 de Mayo 1 ... Notothenia neglecta, a species with similar ecological habits in the fjords. Since sampling by this method ... neglecta, a species with similar ecological habits. Comparisons with earlier data taken from the ... was not controlled, with the result that various yields were obtained per haul (Figure 2). Potter ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 263–274 : Auteur(s): Barrera-Oro, E. and E. Marschoff
-
On the intensity of sampling krill trawl catches
be discerned (e.g., length-with-age). At present, and in the interests of both statistical rigour and ... grouped into 2 mm size classes; • biological implications associated with the detection of specific ... differences in length should be considered in conjunction with the need to collect information on maturity ... desired biological characteristics which are to be discerned (e.g., length-with-age). At present, and in ... implications associated with the detection of specific differences in length should be considered in ... conjunction with the need to collect information on maturity stages; • for most purposes a minimum sample ... also urged Members to report any difficulties experienced with the interim sampling procedure outlined ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 29–48 : Auteur(s): Miller, D.G.M.
-
Small scale krill surveys: simulations based on observed euphausiid distributions
that the coefficient of variation (CV) of mean krill density varies inversely with mean density, and is ... that with probability of Type I and Type II errors 0.1 and 0.2 respectively, about 100 transects would ... (cv) of mean krill density varies inversely with mean density, and is lowest for the survey design ... on the power of surveys to reliably detect changes in mean density indicate that with probability ... earlier surveys, however, were run with the main transects running east-west. This survey design was ... used with some success during the BIOMASS experiments (Miller and Hampton, 1989) on areas with ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/8 (Selected Scientific Papers, SC-CAMLR-SSP/8) : 245–256 : Auteur(s): Agnew, D.J. and S. Nicol
-
Hook selectivity in the longline fishery of Dissostichus eleginoides (Nototheniidae) off the Chilean coast
caught with straight hooks Nos 3 and 4 are not significantly different, but hooks No. 3 are nearly 31 ... hooks. The length frequency distributions of fish caught with straight hooks Nos 3 and 4 are not ... than others (Inostroza, 1975). During 1990, catches of D. eleginoides with longlines along the Chilean ... coast reached a record of 9.387 tonnes (SERNAP, 1991). In accordance with information by DeWitt et al ... regulation does not consider types and sizes of hooks utilised. 3. FISIDNG WITH LONGLINES The first ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/8 (Selected Scientific Papers, SC-CAMLR-SSP/8) : 107–119 : Auteur(s): Moreno, C.A.
-
Surface water circulation in krill fishing areas near the South Shetland Islands
with a drogue attached at a depth of 30 m to assess flow patterns at the depth range where krill tended ... sluggish southwest current with a series of small-scale circular and semi-circular flows in the shelf ... calculations. The picture obtained of the surface circulation was considered in conjunction with the ... oceanic waters to the north of the South Shetland Islands. Each buoy was deployed with a drogue attached ... current with a series of small-scale circular and semi-circular flows in the shelf region, whereas the ... . The picture obtained of the surface circulation was considered in conjunction with the distribution ... regions. It was also emphasised that analyses of data to determine regions of rapid water transport with ...
Science Journal Paper : CCAMLR Science, Volume 3 (CCAMLR Science, Volume 3) : 125–136 : Auteur(s): Ichii, T. and M. Naganobu
-
Distribution of the Soviet krill fishing fleet in the South Orkneys area (Subarea 48.2) during 1989/90
fishing ground off the northwestern tip of Coronation Island. CPUE showed variability with a minimum in ... hydrodynamic characteristics of the area, for example a complex current around the islands together with ... north-east of the region. The fleet was observed drifting with the current together with krill ... aggregations. A maximum CPUE (3.8 tonnes/hour) was recorded at the beginning of the period, with a subsequent ... one fishing ground off the northwestern tip of Coronation Island. CPUE showed variability with a ... islands together with topographically-induced effects. Except in November 1989, temporally and spatially ... major current flowing towards the north-east of the region. The fleet was observed drifting with the ... current together with krill aggregations. A maximum CPUE (3.8 tonnes/hour) was recorded at the beginning ...
Science Journal Paper : CCAMLR Science, Volume 5 (CCAMLR Science, Volume 5) : 51–62 : Auteur(s): Sushin, V.A
-
Analysis of variability of krill size and fish by-catch in the Japanese krill fishery based on scientific observer data
datasets were calculated by the multistage sampling formula with the variance terms derived from the ... population dynamics. Variances of observer datasets were calculated by the multistage sampling formula with ... variables of interest, krill lengths were measured for ca. 100 individuals from a haul, with 9.2% of hauls ... prior distribution with a mean of zero and a large variance term (10 000 in this model). αi, βj and γ ... respectively. These parameters were assumed to follow a normal distribution for the prior with a mean of zero ...
Science Journal Paper : CCAMLR Science, Volume 19 (CCAMLR Science, Volume 19) : 31–47 : Auteur(s): Okuda, T. and M. Kiyota
-
Integrating Count Effort by Seasonally Correcting Animal Population Estimates (ICESCAPE): a method for estimating abundance and its uncertainty from count data using Adélie penguins as a case study
animal count data to a common reference point of breeding chronology for species with a complex temporal ... reported measures of uncertainty associated with originally published counts are propagated through to the ... animal count data to a common reference point of breeding chronology for species with a complex temporal ... , all reported measures of uncertainty associated with originally published counts are propagated ... interacts with the types of bias noted above, concerns sampling. Often, sam- ple counts will be taken from ... relatively brief visits to sites, compared with collecting adjustment data that may require much longer ...
Science Journal Paper : CCAMLR Science, Volume 17 (CCAMLR Science, Volume 17) : 213–227 : Auteur(s): McKinlay, J., C. Southwell and R. Trebilco
-
Krill population biology during the 1991 Chilean Antarctic krill fishery
and 55 mm TL, with a mean TL of 45 mm for females and 48 mm for males. A very weak mode for juvenile ... % juveniles. Of the females sampled, 25.2% bore spermatophores. Although the smallest specimen found with a ... spermatophore had a 36.5 mm TL, 80% of the females with spermatophores had a TL larger than 45 mm. In Area B, a ... bimodal size frequency distribution and a larger size range were found, with one mode between 32 and 55 mm ... between 30 and 55 mm TL, with a mean TL of 45 mm for females and 48 mm for males. A very weak mode for ... specimen found with a spermatophore had a 36.5 mm TL, 80% of the females with spermatophores had a TL ... , with one mode between 32 and 55 mm TL (mean length 43 mm for females and 46 mm for males), and the ... %, males 40% and juveniles 12.9%. Of the females sampled, 27.1 % bore spermatophores, with a size range ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/9 (Selected Scientific Papers, SC-CAMLR-SSP/9) : 223–235 : Auteur(s): Mujica R., A., E. Acuña S. and A. Rivera O.
-
Age determination of Notothenia gibberifrons from the South Shetland Islands, Antarctic Peninsula subarea (Subarea 48.1)
most reliable method. Mean length data at age presented here for Low I. specimens were compared with ... presented here for Low I. specimens were compared with previous published values. This confirmed that fish ... al. (1985); Shust and Pinskaya (1978) and Skora (quoted in Kock et al. 1985) worked with scales ... , while Hoffmann (1982) worked with first pelvic fin ray. Later on, Clasing et al. (1985), using otoliths ... of this paper is to contribute new data on age and length of N. gibberifrons from the South Shetland ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/5 – Part II (Selected Scientific Papers, SC-CAMLR-SSP/5 – Part II) : 143-160 : Auteur(s): Barrera-Oro, E.