Telefon: +47 995 93 389
E-post: trygve.hesthagen@nina.no
Arbeidssted: NINA akvatisk naturmangfold
Kunnskapsområde
Sur nedbør. Kalking, fiskebestander, overvåking. Forsknings- og referansevassdrag. Utbredelse av ferskvannsfisk i innsjøer, urørte lokaliteter og klassifisering av fiskesamfunn ut fra vernekriterier. Aurebestander i regulerte magasin med referanse til fiskeutsetting og beskatningsforhold.
Nøkkelkvalifikasjoner
My profession is in freshwater biology, mainly in fish research. I have major experience in planning different biological projects concerning fish stock assessment, conducting field work in rivers and lakes, and writing reports and scientific papers
Utdanning
1997: Dr. philos. Norwegian University of Science and Technology 1978: M.Sc. (Cand. real.) in freshwater biology at the University of Tromsø, Norway 1973-74: Studies in biology, University of Montana, USA.
Arbeidserfaring
1988-present: Norwegian Institute for Nature Research 1979-88: Directorate for Nature Management, Fish Research Division
Språkkunnskaper
English (excellent)
Konferansebidrag
Berger, H.M., Nøst, T. & Hesthagen, T. 1990. Abundance, population structure and food habits of perch Perca fluviatilis in acidic Norwegian lakes. - Int. Conf. Acid Rain. Glasgow, Scotland, Sept. 1990. Hesthagen, T. 1990. Model for loss of Atlantic salmon stocks from acidified rivers of Norway. – Poster: Int. Conference on National Acid Precipitation Assessment Program. Hilton Head Island, SC, USA, Feb. 1990. Hesthagen, T. 1992. Resource utilization of native and non-native stocked brown trout Salmo trutta in a hydroelectric reservoir in southern Norway. – Poster: World Fisheries Congress, Athen, May 1992. Hesthagen, T. & Sandlund, O.T. 1994. Changes in the distribution and status of Arctic Charr in Norway, with special reference to the effects of acidification. –Talk: Int. Char symp, Trondheim, June 1994. Langeland, A., Hesthagen, T. & Berger, H.M. 1994. Critical transition size og Arctic Charr to piscivory. – Int. Char symp. Trondheim, June 1994. Hesthagen, T. 1997. Relationship between density of young brown trout in streams of different acid-neutralizing capacity in three acidic softwater river systems. – Talk: Congress of Acid Snow and Rain 1997, Niigata University, Niigata, Japan. Hesthagen, T. 1998. Responses of brown trout (Salmo trutta L.) in relation to water quality and critical load of acidity of lakes in western Norway. – Talk:SIL-Congress, Dublin, Irland. Hesthagen, T. & Gran, R. 2000. The effects of stocking young brown trout (Salmo trutta) in a hydroelectric reservoir in southern Norway. – Poster. Eighth Int. Symp. Regulated Streams, Toulouse, France. July 2000. Hesthagen, T. 2000. Recovery of different fish species in acidified areas of southern Norway. – Talk: Northern Lakes Recovery study. Workshop in Grimstad, June 13.-14. Hesthagen, T. & Larsen, B.M. 2000. Atlantic salmon start to recover and re-establish themselves in limed rivers in southern Norway. Poster: 6th Int. conference on Acid Deposition, Tsukuba, Japan. 10-16 December 2000. Hesthagen, T., Forseth, T., Saksgård, R, Berger, H.M. & Larsen, B.M. 2000. Recovery of young brown trout in some acidified streams in southern Norway. – Poster: 6th Int. conference on Acid Deposition, Tsukuba, Japan. 10.-16. December 2000. Hesthagen,T. 2000. Low success rates in re-establishing European perch in some highly acidified lakes in southernmost Norway. –Talk: 6th Int. conference on Acid Depopsition, Tsukuba, Japan. 10-16 December 2000. Hesthagen, T. & Saksgård, R. 2001. Effects of liming on fish populations in Norway, with special emphasis on Arctic charr (Salvelinus alpinus). –Poster: SIL kongress i Melbourne, Australia, februar 2001. Rosseland, B.O., Hesthagen, T. Kroglund, F., Kristensen, T., Wright, R.F. & Røyset, O. 2002. ANC-RECOVERY: What is the chemical threshold for natural reproduction of brown trout during recovery from acidification- I: Workshop on models for biological recovery from acidfication in a changing climate.- Talk: Acid Rain Research, Workshop in Grimstad, Norway (Report 55/02:29). Hesthagen, T. & Østborg, G. 2002. Fish-based assessment of ecological integrity of Norwegian lakes. – Talk: In: Ruoppa, M. & Karttunnen, K. (ed.) Typology and ecological classification of lakes and rivers. TemaNord 2002-566: 68. Hesthagen, T. & Dervo, B.K. 2004. Fiskebasen - NINAs Fiskedata i VannInfo. – Poster presentert ved Direktoratet for naturforvaltnings seminar om ”Biologisk mangfold i kommunene”, arrangert den 3. og 4. november 2004, Trondheim.
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