The take of fish species by seabirds and marine mammals in the Australian Fisheries Zone around Heard Island: the potential for competition with a commercial fishery |
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Authors: | K Green D J Slip G J Moore |
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Institution: | (1) Antarctic Division, Channel Highway, Kingston, Tasmania 7050, Australia, AU |
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Abstract: | . The number of predators from Heard Island foraging in shelf waters, their prey requirements, and the proportion of their
diet that was commercial and non-commercial fish were estimated. The calculated annual consumption of commercial fish species
varied between 36,360 and 84,166 tonnes. The non-commercial Krefftichthys anderssoni was the preferred prey for most predators, and when its occurrence in diets was low it was replaced by crustaceans and commercial
fish species. The estimated annual consumption of Champsocephalus gunnari was approximately 2 and 6 times the highest and lowest estimates respectively of the biomass of this species, obtained from
three fisheries research cruises. For Dissostichus eleginoides, the maximum estimate was 28% of the highest estimate of biomass. The current fishery for D. eleginoides will most likely impact on southern elephant seals, whose population decreased by 50% between the 1950s and the 1980s, possibly
as a result of overfishing around Iles Kerguelen.
Received: 26 January 1998 / Accepted: 20 April 1998 |
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