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Sven-Gunnar Lunneryd 

Behaviour of seals visiting fishing gear

Abstract: The most obvious conflict between seals and man is damage on fishing gear and catch. In Sweden this problem is concentrated to the grey seal (Halichoerus grypus) and the Baltic Sea. The conflict between harbour seal (Phoca vitulina) and fishermen at the Swedish west coast is much less, but will increase with a fast-growing seal population. There is a need for development of a technique for capture of living seals with nets or traps. The main objective is to study the behaviour of branded seals visiting fishing gear and their responses to different deterrent methods.
Studies on seals behaviour in the closure of fishing gear will continue 1998. Capture of seals encountering an artificial fishing gear will be tried. If the capture is successful, seals will be equipped with transmittors in order to study their behaviour at fishing gear, when different deterrent methods are tested. Deterrent methods will also be tested in cooperation with profesionell fishermen for preventing eel fyke nets from damage.

Contact person(s): Sven-Gunnar Lunneryd

Grants: National Board of Fisheries.

Collaboration: Håkan Westerberg, Inst. of Coastal Research, National Board of Fisheries, Göteborg.

Population dynamics of the anisakid nematode (Pseudoterranova decipiens) in the Koster archipelago

Abstract: The seal worm (Pseudoterranova decipiens) is the most abundant anisakid nematode found in the harbour seal in the Koster archipelago. The population-dynamic is complex, including several intermediate hosts, like crustaceans and fishes, before the final stage in the seal. Among the fish species captured near the seals haul-out places, the sea scorpion (Myoxocephalus scorpius) is the most infected species. A long time study is carried out to estimate the abundance of parasites in the sea scorpion population, correlated to the increase of the harbour seal population.

Contact person(s): Sven-Gunnar Lunneryd

Grants: Magistrate Ernst Colliander Foundation

Collaboration: Paul Aspholm and Karl Inne Ugland, Dept. of Marine Zoology, University of Oslo, Norway.

 

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Sven.-Gunnar.Lunneryd@tmbl.gu.se