Search results
-
Fish as diet of the blue-eyed shag, Phalacrocorax atriceps bransfieldensis at Half-Moon Island, South Shetland Islands
Shetland Islands, during January and February 1993, were analyzed to determine the importance of fish in ... the diet of the blue-eyed shag Phalacrocorax atriceps bransfieldensis. Fish species were identified by ... means of otoliths found in the casts. The size and weight of the fish were estimated from the otolith ... , comprising 91% of prey items. From the 937 otoliths found, 562 fish were represented and 524 were assigned to ...
Meeting Document : WG-CEMP-94/32 : Author(s): E.R. Barrera-Oro and R.J. Casaux (Argentina)
-
Information report on the age determination methods of toothfish Dissostichus spp.
Abstract: The document presents the experience of the age determination of toothfish of the genus ... Dissostichus by recording structures (otoliths). Sampling processing is carried out on the basis of annual data ... collected in the CCAMLR Convention Area. The equipment used, the procedure for processing and reading age ... are described. The achieved volumes and results are given. And also the problems that arose and the ...
Meeting Document : WG-SAM-18/29 : Author(s): I.V. Slypko and P.M. Zabroda
-
Underwater noises produced by research vessels (some comments on acoustic sampling protocol for the Area 48 synoptic survey
Abstract: The underwater vessel noise levels perceived by the echosounder EK-500 transducers of ... three Russian research vessels have been presented. These data have been compared to the estimate of the ... underwater noise level, produced by the Icelandic R/V B.Saemundsson.. Underwater noise level perceived by the ... that the level of underwater noise produced by vessel is an important technical property to be taken ...
Meeting Document : WG-EMM-99/18 : Author(s): S. Kasatkina (Russia)
-
Seasonal variation in the diet of Arctocephalus gazella at 25 de Mayo/King George Island, South Shetland Islands, Antarctica
Abstract: The trophic study of Arctocephalus gazella is an essential tool for assessing its ... ecological role as a top predator of the Antarctic marine ecosystem. The aim of this study was to analyse its ... diet during an annual cycle. To our knowledge, this is the first report of the feeding habits of A ... . gazella during the winter period in the South Shetlands area. A total of 224 scats were collected in the ...
Meeting Document : WG-EMM-15/37 : Author(s): A. Harrington, G.A. Daneri, A.R. Carlini, D.S. Reygert and A. Corbalán (Argentina)
-
Theoretical considerations for estimating the density of cohorts and mean recruitment of Patagonian toothfish (Dissostichus eleginoides) based on research trawl survey data
Abstract: The current method used by the Working Group on Fish Stock Assessment (WG-FSA) for ... assessing the long-term yield for toothfish fisheries in CCAMLR uses estimates of density of juvenile ... toothfish derived from research trawl surveys as an estimate of absolute abundance of recruitment to the ... fishery. At the 2003 meeting of WG-FSA a number of inconsistencies were identified in the estimation of ...
Meeting Document : WG-FSA-04/92 : Author(s): C.R. Davies, E.M. van Wijk and A.J. Constable (Australia)
-
Using preferred habitat models for chinstrap penguins (Pygoscelis antarctica) to help improve krill fisheries management during the penguin breeding season
planning. Using habitat models to understand which variables influence the distribution of predators at-sea ... can enable us to predict the distributions of un-tracked populations, and thus help to identify any ... potential threats they may face. In the Southern Ocean the expanding krill fisheries have the potential to ... impact penguin populations. We show that the distribution of chinstrap penguins can be predicted using ...
Meeting Document : WG-EMM-17/33 : Author(s): V. Warwick-Evans, N. Ratcliffe, H.L. Clewlow, L. Ireland, A. Lowther, F. Manco and P.N. Trathan
-
Population dynamics of wandering albatross Diomedea exulans and Amsterdam albatross D. amsterdamensis in the Indian Ocean and their relationships with longline fisheries: conservation implications
Abstract: Studies carried out over the past three decades at Crozet and Kerguelen Islands in the ... 1986 have shown slow recovery. The population of the endangered Amsterdam albatross Diomedea ... study of the Crozet population indicates that the earlier decline was mainly the result of increased ... band recoveries of non breeding birds indicate that during and outside the breeding season these ...
Meeting Document : WG-FSA-96/09 : Author(s): Jouventin, P., Brothers, N., Weimerskirch, H.
-
Implementing Article II of the CAMLR Convention
Abstract: This paper presents a document written by Dr. Robert (Bob) Hofman and submitted to the ... 2015 CCAMLR Symposium in Santiago, Chile. Dr. Hofman was a member of the United States delegation ... during the negotiation of the CAMLR Convention. ASOC has provided some additional background for CCAMLR’s ... consideration. As a participant in the Convention negotiations, Dr. Hofman has an in-depth understanding of the ...
Meeting Document : CCAMLR-XXXIV/BG/25 : Author(s): Submitted by ASOC
-
Influence of tag numbers, size of tagged fish, duration of the tagging program, and auxiliary data on bias and precision of an integrated stock assessment
collection, this study investigated how the bias and precision of a CASAL assessment is influenced by various ... aspects of a tagging program, in particular the effects of the numbers of fish tagged, the duration of a ... tagging program, the size of tagged fish, and the type of auxiliary data used in the assessment. The ... numbers were important particularly in the early stages of an exploratory fishery to ensure some ...
Meeting Document : WG-SAM-12/24 : Author(s): P.E. Ziegler (Australia)
-
Breeding biology and diet of pintado petrels Daption capense at Bouvetøya during the summer of 1996/97
Abstract: A study on the breeding biology and diet of Pintado Petrels Daption capense was ... success for the total 300 pairs of breeding Pintado Petrels at Nyrøysa was 59 %. Three study colonies were ... was 85 %. Rates of failure were higher during the chick stage than in the egg stage for both of these ... two study colonies. The mean hatching date in these colonies was 11 January, and the first and last ...
Meeting Document : WG-EMM-97/56 : Author(s): Isaksen, K., Huyser, O., Dyer, B.M., Cooper, J., Ryan, P.