In Norway, Canadian river trout (Salvelinus fontinalis) have been released into a number of waters in Norway, particularly in southern Norway. This is mainly done because this species is very tolerant of acidification. Therefore, the release of brook trout has become very popular in this region, as our native brown trout disappeared in many waters during the worst period of water acidification, namely in 1960-1985. The first known release of brook trout occurred in the 1880s, when, among other things, brook trout were released in several waters at Øyfjell in Telemark. Releases have lasted until 2010.

Currently, in Norway it is prohibited to release all types of foreign species, so introduced species such as brown trout are no longer allowed to be released. Currently, the species has established itself in a number of waters, and in this case, the Department of Natural and Environmental Health Sciences (INHM) at the University of Telemark (HiT) wanted to conduct a survey of the Canadian river island of Telemark. . '

We therefore wanted to get in touch with people in Telemark who had local knowledge about where the species was released in the region, both information about locations where the species was still found, but also about locations where the species was released but apparently not available. . has established himself. Based on this information, we will contact local journalists and together with them visit the location and verify the information. We will also conduct investigations in Telemark streams where brown trout and Canadian trout live in the same stream, to, if possible, discover the reasons why the two species live in slightly different places in the stream. Additionally, we also wanted to catch some trout (using electric fishing gear) to see their genetics, as well as investigate what parasites they might be carrying.

The information we need is the name of the region, municipality and preferably geographic location (GPS position), as well as the name, address and telephone/email of the reporter. We would be grateful for any information we can obtain about this species.
Information may be sent to the following people:
Professor Espen Lydersen, tel. 411 73146, email: espen.lydersem@hit.no
Master Candidate: Grunde Aasveen, tel. 482 15077, email: aasveen@hotmail.com