Community Research and Development Information Service - CORDIS

Effects of Substance EX treatment on hatchery-reared salmon at Ims and Talvik

Groups of 2 × 2000 Atlantic salmon smolts were Carlin tagged and released below the fish trap in May at NINA’s Research Station for Salmonids at Ims in Rogaland in 2003 and 2004. One group was treated with Substance EX (which protects the fish against salmon lice infection for up to 16 weeks) while the other group was unprotected.

The same treatments were performed at the Talvik Research Station in Finnmark and fish were released below the fish trap in the River Halselva by the end of June. Individuals of each species were divided into two groups 1) protected against salmon lice infection with a prophylactic pharmaceutical product and 2) untreated controls.

The preliminary results of the present experiment show that whilst Substance EX-treated Atlantic salmon smolts were significantly longer and heavier on return than untreated smolts, there was no significant increase in condition. Increases in size and condition may have an influence on the spawning success of the fish and therefore affect future generations.

The final results of these studies are highly relevant for developing management practice both for protecting fish against salmon lice attacks and for monitoring the salmon lice pressure in fjord systems, and will aid authorities in an ongoing process evaluating the farming protection zones in Norway. Experience gained from Norway will assist similar management decisions in other regions of Europe where aquaculture is conducted.

Reported by

Norwegian Institute for Nature Research
Tungasletta 2
N-7485 Trondheim
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