Search results
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Modelling growth of Antarctic krill: a new approach to describing the growth trajectory
from population-level data consisting of modal lengths obtained from a time sequence of length ... frequency samples. We develop an alternative approach to predicting the trajectory of length over time using ... a step-growth function that combines models of instantaneous growth rate (IGR) at moult calibrated ... from direct measurements of individual pre- and post-moult krill sampled from the wild with a model of ...
Meeting Document : WG-EMM-05/27 : Author(s): S. Candy and S. Kawaguchi (Australia)
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Electronic monitoring of seabird interactions with trawl third-wire cables on trawl vessels – a pilot study
third-wire cables on trawl vessels. This pilot study involved field testing of EM systems on shoreside ... Economic Zone. EM systems, consisting of two closed circuit television cameras, GPS, hydraulic and winch ... one-month period in the fall of 2002. Detailed analysis of about 200 hours of fishing imagery occurred ... cables. The EM system provided imagery of sufficient quality to detect the presence, abundance, and ...
Meeting Document : WG-FSA-04/23 : Author(s): H. McElderry, J. Schrader, D. McCullough, J. Illingworth, S. Fitzgerald and S. Davis (USA)
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Electronic monitoring of seabird interactions with trawl third-wire cables on trawl vessels – a pilot study
third-wire cables on trawl vessels. This pilot study involved field testing of EM systems on shoreside ... Economic Zone. EM systems, consisting of two closed circuit television cameras, GPS, hydraulic and winch ... one-month period in the fall of 2002. Detailed analysis of about 200 hours of fishing imagery occurred ... cables. The EM system provided imagery of sufficient quality to detect the presence, abundance, and ...
Meeting Document : WG-FSA-04/23text : Author(s): H. McElderry, J. Schrader, D. McCullough, J. Illingworth, S. Fitzgerald and S. Davis (USA)
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Interannual variability of polynya extent in the Antarctic Ocean
Abstract: There are two general kinds of polynya (an ice-free area within sea ice borders ... processes by exposing the surface of ocean to the atmosphere. Additionally, we think that the coastal ... reports on the place, time and shape of the coastal polynyas. Accordingly, we pursued the transition of ... the coastal polynyas using satellite image data of sea ice concentrations by the NSIDC (National Snow ...
Meeting Document : WG-EMM-01/34 : Author(s): M. Naganobu and K. Segawa (Japan)
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Trawl survey of the Patagonian toothfish (Dissostichus eleginoides) resource off the Prince Edward Islands
Abstract: A bottom trawl survey was conducted in the northern half of the South African EEZ ... around the Prince Edward Islands in April 2001. Due to the paucity of bathymetric data, it was not ... study to ascertain the feasibility of conducting future trawl surveys, and to collect relevant data to ... aid in the design of such surveys should they be deemed practical. The maximum operating depth for the ...
Meeting Document : WG-FSA-01/72 : Author(s): R.W. Leslie and B.P. Watkins (South Africa)
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Trends in relative abundance of fjord Notothenia rossii, Gobionotothen gibberifrons and Notothenia coriiceps in trammel net catches at Potter Cove, South Shetland Islands
Abstract: A monitoring program of demersal fish in inshore sites of the South Shetland Islands ... has continued in Potter Cove from 1991 to 1998, covering a continuous sampling period of 15 years and ... in Harmony Cove, Nelson Island, in the austral summer 1995/96. The decline in trammel net catches of ... fjord fishes of the species Notothenia rossii and Gobionotothen gibberifrons in relation to the non ...
Meeting Document : WG-FSA-98/57 : Author(s): E. Barrera-Oro, E.R. Marschoff and R.J. Casaux (Argentina)
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Pup production and distribution of breeding Antarctic fur seals (Arctocephalus gazella) at South Georgia
Abstract: A census of the breeding population of Antarctic fur seals (Arctocephalus gazella) at ... South Georgia was carried out during the 1990/91 breeding season. Using counts of adult females ashore ... at the breeding grounds during the pupping period, together with corrections for the likelihood of a ... long-term study sites probably because of a short term reduction in food availability. Data from these ...
Meeting Document : WG-CEMP-92/39 : Author(s): I.L. Boyd (United Kingdom)
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Using effective sample sizes to evaluate the efficiency of length samples collected by at-sea observers in the krill fishery in Subarea 48.1
. Although analyses in the past have looked to the optimal design of the observer program, in terms of levels ... of coverage of vessels and hauls (e.g., Agnew et al., 2009; 2010), less attention have been focussed ... characterise how many krill are measured by observers, and for how many hauls. We then simulate the impact of ... combination (effective sample size). The median number of krill measured per haul was around 200 (range 0-652 ...
Meeting Document : WG-SAM-16/39 : Author(s): N. Kelly, S. Kawaguchi, P. Ziegler and D. Welsford
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Integrated analysis of the by-catch data in the Ross Sea toothfish fishery
Abstract: The indices of exploratory toothfish fishery in the Ross Sea for the period of 2008 ... hooks) and normalized target catch ratio. There was evidence of distinct differences in the mean (and ... the flag States, should be considered as the primary cause of the observed variability in the ... target catch ratio in the Ross Sea. The observed influence of the longline gear types (Autoline ...
Meeting Document : WG-FSA-16/13 Rev. 1 : Author(s): S. Kasatkina
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Results of the first winter longline survey to the northern Ross Sea region to investigate toothfish reproductive life history
Abstract: The first winter longline survey of Antarctic toothfish in the northern Ross Sea region ... was successfully completed during June and July 2016. A total of 55 longlines sets were completed in ... the 4 strata, and 55.2 t of Antarctic toothfish and 3.4 t of Patagonian toothfish were caught ... northwest of stratum 1. Gonad staging and gonadosomatic indices suggest that males in spawning condition may ...
Meeting Document : WG-FSA-16/37 : Author(s): D. Stevens, D. Di Blasi and S. Parker