Loss of negative eye-size allometry in a population of Aplochiton zebra (Teleostei: Galaxiidae) from the Falkland Islands

McDowall, R.M., and Pankhurst, N.W. (2005) Loss of negative eye-size allometry in a population of Aplochiton zebra (Teleostei: Galaxiidae) from the Falkland Islands. New Zealand Journal of Zoology, 32 (1). pp. 17-22.

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Abstract

The population of zebra trout (Aplochiton zebra – Galaxiidae) in Red Pond, Falkland Islands, lacks the negative eye size allometry that is typical of the species elsewhere. Eye size retains a near constant relationship to head length throughout growth in Red Pond. In addition, the bold, narrow, vertical, zebra-like, dark bands typically found on the body of this species are lacking, or are present in the Red Pond population only as broader dusky blotches. Absence of negative allometry is probably due to lack of coupling of eye and somatic growth, probably owing to slow growth of the fish living in the challenging dietary environment of a turbid lake. Observations of diet show that the species is a generalised invertebrate carnivore, but that food intake may be low, suggesting that the modified coupling of eye growth to somatic growth is a likely explanation of the loss of negative allometry.

Item ID: 14073
Item Type: Article (Refereed Research - C1)
Keywords: Aplochiton; growth; Falkland Islands; vision; eye size; turbidity
ISSN: 1175-8821
Date Deposited: 23 Nov 2010 23:38
FoR Codes: 07 AGRICULTURAL AND VETERINARY SCIENCES > 0704 Fisheries Sciences > 070401 Aquaculture @ 100%
SEO Codes: 83 ANIMAL PRODUCTION AND ANIMAL PRIMARY PRODUCTS > 8301 Fisheries - Aquaculture > 830199 Fisheries - Aquaculture not elsewhere classified @ 100%
Citation Count from Web of Science Web of Science 7
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