New Zealand Journal of Marine and Freshwater Research abstracts

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OCCURRENCE OF GRAVEL IN THE STOMACHS OF TWO NEW ZEALAND STREAM-DWELLING FISH (NOTE)

Philip L. Cadwallader*

Zoology Department, University of Canterbury, Christchurch, New Zealand

Abstract Gravel occurred in. the stomachs of 17.8% of 924 Galaxias vulgaris and 2.8% of 430 Philypnodon breviceps taken from the Glentui River, Canterbury, between June 1970 and November 1971. It is suggested that differences in feeding habits and feeding locality are responsible for the difference in occurrence of gravel in the stomachs of the two fish species. Galaxias vulgaris feeds in the water column in riffles and, being a drift feeder, is more likely to ingest inedible material by accident than is P. breviceps, which feeds on the bottom in sheltered or quiet stretches of the river.

N.Z. Journal of Marine and Freshwater Research 9 (/) : 101-3.
(Received for publication 5 September 1974)

PDF file of entire paper: medium quality (201K); (scanned from paper original: notes about this process)

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