Nofima reports

Rapport/Report 39/2016 – English summary

Helland, Synnøve

Publication details

Publisher: Nofima AS

Issue: 39/2016

Number of pages: 9

International Standard Numbers:
Printed: 978-82-8296-420-3

Open Access: green


Identification of salmon at the individual level, commonly used in research and breeding programs, currently uses PIT-tags. These small marks are injected into the abdominal cavity. In a pilot project funded by FHF iris scanning was tested against PIT-tag as a method for identification of individual salmon. Based on results from the pilot project several factors were improved. Phase 2 is the next step in the "proof of concept" for iris scanning as a method for identification of salmon at the individual level, and consists of two separate experiments.
Experiment 1. Two databases were established, one for PIT tag and one for iris scanner with the same ID on 104 fishes. Of these, two fish were unrecognized and 102 fish got the correct ID. Based on these good results the project decided to go ahead and experiment 2 was to be performed.
Experiment 2. Databases were established in November 2015, and the fish should be tested for ID through the salmon smoltification process. IDs were tested after dark (light controlled short day), after continuous light and after six weeks at sea. Test 1 (after the dark phase) showed correct ID of 81% of the fish, erroneous ID of 15% of the fish and insecure ID of 4% of the fish. Test 2 and Test 3 was conducted with other cameras than what the databases were established with and therefore cannot be considered.
The report covers several improvement factors that must be in place in any future work on "proof of concept".