Havforskningsinstituttet Tråling Postsmolt laks 2023 Vågsfjorden ...

• Main Author: Karlsen, Ørjan
• Format: Dataset
• Language: unknown
• Published: Institute of Marine Research 2023
• Subjects: Norway; Vågsfjorden
• Online Access: https://dx.doi.org/10.21335/nmdc-1054180211; http://metadata.nmdc.no/metadata-api/landingpage/44ee9eb4f1388f8629bb65cef2fcb903

The dataset includes Institute of Marine Research data from trawl stations in Vågsfjord, Norway in 2023 Post-smolts were collected in the outer parts of the fjord systems in late spring and early summer with a specialized surface trawl for live fish sampling, towed behind a suitable fishing vessel (15-25 m). The trawl is 5 m deep and up to 35 m wide depending on speed through water. The trawl is mounted to a system where smaller catch, such as post-smolts are separated from other catch, and remain free swimming in low turbulence in a hydrodynamic aquarium. The separation takes place when the current flow through a net tunnel and over two 45 degrees racks. The first rack (10 mm between bars) lifts the catch to the next (20 mm between bars) where the separation is done. Everything wider than 20 mm will continue to the cod end of the trawl. Details of the post-smolt trawl are described in Holst and McDonald (2000), Fisheries Research 48, pp 87-91. Typical trawling speed is 2-3 knots (STW) with a duration of 2-4 ...