New Zealand Journal of Marine and Freshwater Research abstracts

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Postal surveys of anglers fishing for sea-run Chinook salmon on the Rakaia River, Canterbury, New Zealand, 1973/74 and 1974/75.

I. F. WEST1 R. H. GOODE2

1Fisheries Research Centre Ministry of Agriculture and Fisheries P. O. Box 297, Wellington New Zealand
2 23 Brent Place Christchurch 5 New Zealand

Abstract Postal probability surveys were used to estimate the angler catch of salmon, and the number of anglers fishing for salmon, on the Rakaia River, Canterbury, New Zealand, for the seasons 1973/74 and 1974/75. Response levels of over 97% were obtained. An estimated 3531 fish were caught by an estimated 4405 anglers in 1973/74 and 4875 fish by 5332 anglers in 1974/75. The sample catch frequency distributions returned were highly positively skewed with few anglers catching most of the fish. The effect of this skewness on the estimate of total catch was investigated by bootstrapping and confidence intervals thus set were compared to those derived from the Gaussian assumption. Confidence limits were obtained for the estimate of number of anglers.

Keywords Rakaia River; quinnat salmon; king salmon; chinook salmon; Oncorhynchus tshawyts-cha; skewness; angler catch; postal sample survey; bootstrapping; angler numbers

New Zealand Journal of Marine and Freshwater Research, 1986, Vol. 20: 345-354 Received 25 September 1984; accepted 5 December 1985

PDF file of entire paper: medium quality (690K); (scanned from paper original: notes about this process)

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