New Zealand Journal of Marine and Freshwater Research abstracts
Fecundity of chinook salmon {Oncorhynchus tshawytscha) from the Waitaki and Rakaia Rivers, New Zealand
THOMAS P. QUINN1 SIMON BLOOMBERG2
Freshwater Fisheries Centre Ministry of Agriculture and Fisheries P. O. Box 8324, Riccarton Christchurch, New Zealand
Present address: School of Fisheries WH-10, University of Washington, Seattle, WA 98195, USA
2Present address: The Oamairu Mail, P.O. Box 343, Oamaru, New Zealand
Abstract
The fecundity of chinook salmon
(Oncorhynchus tshawytscha) was estimated from maturing fish captured by anglers in the lower Waitaki River in 1985 and 1987-89, and from mature fish spawned at the Glenariffe Research Station on the Rakaia River in 1992. Fecundity was positively correlated with fork length (FL); estimated fecundities at 750 mm FL were 5024 eggs for Waitaki and 4829 eggs for Glenariffe salmon. The slopes of the regressions of fecundity on FL differed between the populations but the Glenariffe data did not differ from Rakaia River samples from 1967, 1973, and 1976. Significant inter-annual variation in the FL-fecundity relationship was detected in Waitaki River samples. Egg weights, taken from the Glenariffe samples, were positively correlated with length and averaged 0.17 g. However, salmon with high fecundity for their FL tended to have small eggs, and vice versa.
Keywords chinook salmon; Oncorhynchus tshawytscha; New Zealand; egg weight; reproductive output
M91O42
Received 30 July 1991; accepted 27 July 1992
New Zealand Journal of Marine and Freshwater Research, 1992, Vol. 26:429-434 The Royal Society of New Zealand 1992
Received 30 July 1991; accepted 27 July 1992
PDF file of entire paper: medium quality (470K); (scanned from paper original: notes about this process)
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