Penlington: Lake-shore spawning of rainbow . . .

New Zealand Journal of Marine and Freshwater Research abstracts

Lake-shore spawning of rainbow trout at Lake Rotoma, New Zealand

B. P. PENLINGTON

Fisheries Research Division Ministry of Agriculture and Fisheries P. O. Box 951, Rotoma New Zealand

Abstract The presence of suitable gravel size alone can stimulate female rainbow trout (Salmo gairdneri) to excavate nests for spawning on the shores of Lake Rotoma. Emergent fry result from lake-shore spawning, and could contribute significantly to the trout fishery in Lake Rotoma. Lake-shore spawning could be enhanced by the use of stable artificial spawning beds that have adequate depth and appropriate sizes of gravel.

Keywords Salmoniformes; Salmo gairdneri; rainbow trout; spawning; spawning grounds; reproductive behaviour; lakes; Lake Rotoma; artificial substrate

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