Introduction and extinction of brown trout (Salmo trutta L.) in an impoverished subantarctic stream

Cooper, J. and Crafford, J.E. and Hecht, T. (1992) Introduction and extinction of brown trout (Salmo trutta L.) in an impoverished subantarctic stream. Antarctic Science, 4 (1). pp. 9-14. ISSN 0954-1020

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Official URL: http://dx.doi.org/10.1017/S095410209200004X

Abstract

Brown trout were introduced to the Van den Boogaard River on subantarctic Marion Island in 1964, and a small population became established. The last individual was seen in 1984, and the species is now considered to be extinct on the island. Their diet was exclusively allochthonous, with snails and spiders predominating. Ages estimated at six to eleven years showed that spawning must have occurred since the original introduction. Since the Van den Boogaard River enters the sea via a waterfall, it is postulated that trout were not able to practice an anadromous life-style, and that this, as well as other factors connected with the impoverished nature of the stream, led to dwarfing of the resident population. No further introductions of alien fish to Marion Island should be contemplated.

Item Type:Article
Uncontrolled Keywords:anadromy; diet; fish; growth; life-history style; brown trout; introduced fish; trout; Salmo trutta; Indian Ocean; Marion Island; Van den Boogaard River
Subjects:Y Unknown > Subjects to be assigned
Divisions:Faculty > Faculty of Science > Ichthyology & Fisheries Science
ID Code:723
Deposited By:INVALID USER
Deposited On:29 Jun 2007
Last Modified:06 Jan 2012 16:18
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