Project Details


The last years of development of the salmon stocks in western Jutland has been a success. This is achieved through specific management focus on removing the constraints identified in freshwater and coastal areas, as well as a modified release practices. One of the major challenges for the continued successful management is knowledge of the salmon's marine life. This is the project's overall objective, to obtain more knowledge about this part of the salmon's life, so as to describe the salmon's marine life. So far it has not been possible to make more specific behavioural studies of Danish salmon marine life for two reasons. First: there were very few salmon, and second: there has simply not been technology available to get behavioural data from the fish, apart for the very expensive marine expeditions.

Especially with the development of electronic tags, such as data storage tags (DST) and pop-up satellite tags (PSAT) it is now possible. DST tags are passive tags that records information about the fish's environment and store them. Upon retrieval the data can be offloaded to a computer. The tag is labelled providing an address and information about the reward by for return of the tag. A PSAT tag is essentially the same type of tag, but also contains a satellite device that can send the recorded information to the ARGOS satellite system and a release mechanism. At a predetermined time, the tag detaches from the animal and rises to the surface sending stored information to the satellites. These new types of tags allow you to record information about the fish’s environment with an unprecedented accuracy and both types of labels have large application possibilities (Neuenfeldt et al. 2009, Aarestrup et al 2009). Currently, the limitation is the size of the transmitters and attachment method. Both types of tags are (still) too big for smolt, so kelts will be the most obvious group of salmon to tag. Another way to examine the salmon's movements in the sea is to investigate the chemical fingerprints of fish’s scales (Svendsen et al. 2009). The method is a consequence of the fact that a number of stable compounds from the fish food items are incorporated in the fish scales and otoliths. By analysing the fish's scales or otoliths a "chemical fingerprint" depending on where the fish were and what they have eaten can be obtained. Scale samples will be taken from the tagged salmon and the "chemical fingerprint" from these Danish salmon will be compared with "chemical fingerprint" of scales from other population where salmon has been tagged with PSAT tags.

The project is coordinated by DTU Aqua.

Research area: Freshwater Fisheries and Ecology
Effective start/end date01/01/201131/12/2015


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