Search results
-
Towards a strategic framework for assessing uncertainty in ecosystem dynamics models: objectives are sensitive too
candidate feedback management approaches for the Antarctic krill fishery in the southern Drake Passage and ... Scotia Sea. The Foosa ecosystem dynamics model was developed to perform spatially resolved, stochastic ... simulations of krill, its predators and fishery. It has been used to provide advice on the spatial allocation ... of the precautionary catch limit for krill. Foosa might therefore be a suitable simulation platform ...
Meeting Document : WG-EMM-12/20 Rev. 1 : Author(s): S. Hill and J. Matthews (United Kingdom)
-
Mitigation of Macrourus by-catch in research block 58.4.1_6 and estimation of Macrourus biomass and sustainable catch in Divisions 58.4.1 and 58.4.2
Abstract: Macrourus spp. are the major by-catch species in the exploratory toothfish fishery in ... ) avoidance, ii) mitigation and iii) the setting of sustainable by-catch limits if mortality is not ... preventable (SC-CAMLR-XXII, paragraph 5.230). Here, we undertake a risk assessment of the effects of ... block 58.4.1_6 in particular. We investigate the distribution of D. mawsoni and Macrourus spp. catch ...
Meeting Document : WG-FSA-17/23 : Author(s): D. Maschette, P. Burch, P. Yates and P. Ziegler
-
CCAMLR scientific observation: tasks, priorities and time budget
Abstract: The workload of the tasks required in the CCAMLR Observer manual is assessed. The total ... time needed for the minimum amount of daily routine tasks was well above the capacity that an observer ... to undertake. The manual must be structured as its entirety so that the observer, only by following ... instructions in the manual, can produce the report and logbook data which is collected systematically and ...
Meeting Document : WG-EMM-07/26 : Author(s): S. Kawaguchi (Australia)
-
Fish stock assessment survey in Subarea 48.3, 2004
Abstract: This report describes the activities and preliminary results of the 9th UK fish stock ... British Antarctic Survey scientists during January and February 2004. In addition to the random stratified ... bottom trawl survey the research was extended by a week in order that further investigations into the use ... of acoustic methods for the determination of icefish biomass could be undertaken. Following the ...
Meeting Document : WG-FSA-04/85 : Author(s): M. Belchier, M. Purves, M. Collins, S. Hawkins, T. Marlow, R. Mitchell, J. Szlakowski and J. Xavier (United Kingdom)
-
Target strength of mackerel icefish (Champsocephalus gunnari) from a scattering model
Abstract: An anatomically detailed acoustic scattering model has been used to estimate the ... cm, at 38 kHz. The model used computed tomography (CT) scans of fish to determine the sound speed and ... density throughout the fish and simulated the complex interaction of the incident sound wave with the ... acoustic impedance contrasts throughout the fish. A preliminary length to tilt-averaged TS relationship is ...
Meeting Document : SG-ASAM-09/06 : Author(s): G. Macaulay (New Zealand)
-
Hydrographic conditions around Elephant Island during austral spring 1994
Abstract: Based on a data set sampled during November/December 1994 in the Elephant Island ... Plateau Region by RV POLARSTERN, a water mass analysis is performed which reveals the approximate location ... of the Weddell-Scotia Confluence. Vertical distribution of oceanographic parameters temperature ... outline the genera! flow as given by the geostrophic part of the circulation. Compared to American field ...
Meeting Document : WG-EMM-95/16 : Author(s): Stein, M.
-
A conceptual model of Japanese krill fishery
Abstract: The behaviour patterns of Japanese krill fishery vessels in Area 48 were analysed using ... questionnaires on the reasons why the vessel changed their fishing grounds, which were sent out to of the ... Japanese fishing vessel since the 1989/90 fishing season. Among many reasons for changing fishing grounds ... , krill density, krill, size, ice condition, transshipment, and salp-by catch accounted for 95.6% of the ...
Meeting Document : WG-EMM-05/30 : Author(s): S. Kawaguchi, S. Nicol (Australia), K. Taki and M. Naganobu (Japan)
-
Summary of monitoring and research activities at Svarthamaren, Dronning Maud Land
Svarthamaren, Dronning Maud Land from five field seasons between 1991/92 and 1996/97 is presented. The results ... of the population monitoring show that the number of pairs with chick or egg varied between 55,387 ... -178,240 (mean 119,000). Assuming that about 10 % of the colony is situated in inaccessible parts outside ... the area covered by the monitoring system the mean number of pairs producing a chick each year is ...
Meeting Document : WG-EMM-97/78 : Author(s): Lorentsen, S., Tveraa, T., Røv, N.
-
Entanglement of Antarctic fur seals in man-made debris at Bird Island, South Georgia
Abstract: The incidence of entanglement of Antarctic fur seals (Arctocephalus gazella) in Man ... -made debris at Bird Island, South Georgia, was monitored throughout the austral winter and summer of ... 1991 as part of an on-going study by the British Antarctic Survey. Only seven seals were observed ... entangled during the winter months (April- October) while 48 were sighted during the pup-rearing period ...
Meeting Document : SC-CAMLR-XI/BG/09 : Author(s): Delegation of United Kingdom
-
Development of an algorithm designed to assess observer data quality and performance
Abstract: As part of the Secretariat task to ensure the quality and consistency of the data ... arising from the CCAMLR SISO, an algorithm was designed to automatically import and check data entered by ... observers in their logbooks. A first version of the algorithm was tested on four randomly selected longline ... fishery logbooks. In its current version the algorithm is able to detect and report invalid data formats ...
Meeting Document : WG-SAM-13/40 : Author(s): Secretariat