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Recent events concerning Atlantic salmon escapees in the Pacific 总被引：1，自引：0，他引：1
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R. W. Hickman 《新西兰海洋与淡水研究杂志》2013,47(2):231-240
At 2‐monthly intervals between March 1974 and January 1975 seawater temperature and salinity (at 0 m and 5 m depths) and turbidity (as Secchi disc visibility) were measured in Port Fitzroy and adjacent bays on Great Barrier Island (36°11'S, 175°21'E). A seasonal pattern was evident in all three parameters. Variation between depths and between high and low tides was generally only slight, although differences of up to 3.6°c and 12.58‰ were recorded occasionally. Maximum temperatures (22–23°c) occurred in January, with minima (13–14°c) in July. Salinities were generally between 35.0 and 35.6‰, but values as low as 22.25‰ at the surface were recorded after heavy rainfall. Secehi disc visibility measurements of turbidity varied between 2.0 and 12.5 m, but were usually 5–9 m. A graded series of four generalised areas was distinguished, ranging from sheltered, almost estuarine inner bays, to exposed open water with properties similar to outer Hauraki Gulf water. The circulation through Port Fitzroy comprises the main exchange of water through the northern entrance channel, causing a southerly movement of water on the flood tide and a northerly movement on the ebb, together with a small compensatory exchange through the narrow southern entrance. 相似文献
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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. 相似文献
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MacKenzie K.; Longshaw M.; Begg G. S.; McVicar A. H. 《ICES Journal of Marine Science》1998,55(2):151-162
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Friedland Kevin D.; Chaput Gerald; MacLean Julian C. 《ICES Journal of Marine Science》2005,62(7):1338-1349