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International Introductions of
Salmo trutta Introductions as compiled by FAO |
| Main Ref: | FAO 1997 | ||||
| To: | New Zealand | ||||
| FAO area: | Oceania - Inland waters | ||||
| From: | Italy | ||||
| FAO area: | Europe - Inland waters | ||||
| Year: | 1867 | ||||
| Range: | - | ||||
| Period: | 19th century | ||||
| Established in the wild: | established, natural reproduction | ||||
| Established in aquaculture: | - widely used | assisted/artificial reproduction | |||
| Significant ecological interactions: | probably some - adverse | ||||
| Significant socio-economic effects: | some - undecided | ||||
| Introduced by: | other introducer | ||||
| Reason: | angling/sport | ||||
| Other reason: | |||||
| Comments: | Reintroduced in the 1880s and 1960s. Widespread in North and South Is. Range is stable (neither expanding nor declining) (Ref. 52336). Abundant in rivers. Probably the most important fish for angling in the country (Ref. 6452). Brown trout from many different stocks have been liberated by Acclimatization Societies particularly intensively in the last third of the 19th century in rivers and lakes all through New Zealand. At present brown trout are found in most river systems south of Coromandel(37gr.S) as water temperatures of rivers north of there tend to be too high for successful reproduction. Trout tend to be absent from the east coast rivers of the North Island where sedimentary rocks are too soft to give rise to suitable spawning gravels. The impact of the introduction on native fish has been apparent on in reduction of riverine and lake populations of galaxiids. Many authors conclude that the native galaxiid fauna has retreated to headwater areas where trout are absent. The native eleotrid fauna remain an important prey item of trout. Also Ref. 43891. Ref: McDowall, R.M., 1990 | ||||
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