Blar i Fisken og havet (1958- ) på forfatter "Simonsen, Jan Henrik"
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Metode for lokalisering og verdisetting av gyteplasser i fjorder med dype terskler, åpne havbukter og sund
Espeland, Sigurd Heiberg; Albretsen, Jon; Dahle, Geir; Asplin, Lars; Olsen, Torstein; Olsen, Esben Moland; Simonsen, Jan Henrik; Bodvin, Torjan (Fisken og havet;1-2010, Research report, 2009-12-31)Marine mapping of spawning areas for coastal cod have become increasingly important. Previous mapping have considered aggregations of mature cod. In this study we also evaluate distribution of cod eggs and their passive ... -
Næringsvalg hos sjøørret i sjø på Skagerrakkysten, undersøkelser av mageinnhold
Knutsen, Jan Atle; Gjøsæter, Jakob; Simonsen, Jan Henrik; Enersen, Kate; Aass, Asbjørn (Fisken og havet, Research report, 1996)Sea trout was caught in the sea in the Arendal area at the Norwegian Skagerrak coast using beach seine and big traps. A total of 497 fish were analysed. Most fish caught were 3 years old, but 2 and 4 years old fish were ... -
Restaurering av utvalgte sjøaurevassdrag i Aust-Agder: forundersøkelse og plan for gjennomføring
Olsen, Esben Moland; Simonsen, Jan Henrik; Knutsen, Jan Atle (Fisken og havet, Research report, 2002)Small coastal strearns are important spawning and nursery areas for seatrout (Salmo trutta). However, in many areas, stream habitat quality has been severely reduced by human activities. We suggest how to restore the ...