Institute of Marine Research

Ove Skilbrei

Phone: 55 23 68 94

E-mail: Send e-mail

Works with

Dr. Ove T. Skilbrei, seniorforsker (dr. phil.)

Eksperimentelle studier av hvordan vekst og kjønnsmodning hos laks påvirkes av miljøforholdene. I den siste tiden fokus på studier av kjønnsmodne lakseunger (parr), såkalte dverghanner. Dverghanner har blitt testet som stamfisk i kultiveringsøyemed, og utviklingen deres i kar har blitt studert.

Hvilken betydning lakselus kan ha for overlevelsen til utvandrende laksesmolt. Vi foretar årlige utsettinger av laksesmolt som har blitt behandlet mot lakselus i Daleelv (Vaksdal kommune) i Hordaland. Smolten er merket og settes ut ulike steder langs utvandringsruten til smolten fra elven til kysten. Gjenfangstene av voksen laks som kommer tilbake fra havet etter ett eller flere år antyder hvordan overlevelsen har vært ulike år, og fra ulike slippsteder.

Adferd til rømt laks og regnbueørret. En rekke simulerte rømminger har blitt utført fra 2005 for å kartlegge adferd, overlevelse og geografisk spredning av rømt laks. I tillegg er det gjort forsøk med rømt regnbueørret i fjordene ved Osterøy. Hensikten er å få et bedre grunnlag for å vurdere risiko ved rømming når smolt eller voksen fisk stikker av fra oppdrettsmerdene. Fisken har vært merket med vanlige ytre merker, og i noen tilfeller med akustiske sendere. Disse senderne er blitt operert inn i buken på fisken, og sender signaler som må fanges opp av lyttebøyer i fjordsystemet. Akustikk studiene gir et mer nyansert bilde av adferden til rømt fisk i nærområdet, mange av merkene er for eksempel utstyrt med dybdesensor slik at merket også sender informasjon til lyttebøyene om fiskens svømmedyp.

Curriculum Vitae

VITENSKAPELIGE PUBLIKASJONER

2011

1. Skilbrei OT, Heino M. 2011. Reduced daylength stimulates size-dependent precocious maturity in 0+ male Atlantic salmon parr. Aquaculture (in press).

2010

2. Olsen RE, Skilbrei OT (2010) Feeding preference of recaptured Atlantic salmon, Salmo salar, that escaped from fish pens during autumn. Aquaculture Environment Interactions 1: 167 – 174.
3. Skilbrei, OT (2010). Adult recaptures of farmed Atlantic salmon postsmolts allowed to escape during summer. Aquaculture Environment Interactions: 147 – 153.
4. Skilbrei, OT (2010) Reduced migratory performance of farmed Atlantic salmon post-smolts from a simulated escape during autumn. Aquaculture Environment Interactions 1: 117 – 125.
5. Skilbrei OT, Jørgensen T (2010) Recapture of cultured salmon following a large-scale escape experiment Aquaculture Environment Interactions 1: 107 – 115.
6. Skilbrei, O. T., Wennevik, V., Barlaup, B. and Wiers, T. 2010. Delayed smolt migration of stocked Atlantic salmon parr (Salmo salar). Fisheries Management and Ecology 17: 493 – 500.
7. Skilbrei, O. T., Holst, J. C., Asplin, L., & Mortensen, S. 2010. Horizontal movements of simulated escaped farmed Atlantic salmon (Salmo salar L.) in a western Norwegian fjord. – ICES Journal of Marine Science, 67: 1206-1215.
8. Glover, K. A., Samuelsen, O. B., Skilbrei, O. T., Boxaspen, K., and Lunestad, B. T, 2010. Pharmacokinetics of emamectin benzoate administered to Atlantic salmon (Salmo salar L.) smolts by intra-peritoneal injection. Journal of Fish Diseases 33, 183-186.

2006 - 2009

9. Skilbrei, O.T., Holst, J. C., Asplin, L., and Holm, M. 2009. Vertical movements of ”escaped” farmed Atlantic salmon (Salmo salar) - a simulation study in a western Norwegian fjord. doi: 10.1093/icesjms/fsn213. ICES Journal of Marine Sciences 66: 278-288.
10. Skilbrei, O. T., Glover. K., Samuelsen, O., Lunestad, B.T. 2008. A laboratory study to evaluate the use of emamectin benzoate in the control of sea lice in sea-ranched Atlantic salmon (Salmo salar L.). Aquaculture, 285; 2-7.
11. Glover, K., Skilbrei, O.T, Skaala, Ø. 2008. Genetic assignment identifies farm of origin for Atlantic salmon Salmo salar escapees in a Norwegian fjord. –ICES Journal of Marine Science, 65: 912-920.
12. Skilbrei O. T. and Wennevik V. 2006. A comparative study of the performance of family groups of Atlantic salmon reared in tanks and stocked in a river. In: Wennevik V. 2006. The application of genetic profiling and statistical assignment methods in the management of fish populations. PhD degree, University of Bergen, Norway 2006.
13. Skilbrei, O. T. and Wennevik, V. 2006. The use of catch statistics to monitor the abundance of escaped farmed salmon and rainbow trout in the sea. –ICES Journal of Marine Science, 63: 1190-1200.
14. Skilbrei, O.T. and Wennevik, V. 2006. Survival and growth of sea-ranched Atlantic salmon, Salmo salar L., treated against sea lice prior to release.-ICES Journal of Marine Science, 63: 1317-1325.

1998 - 2004
15. Skilbrei, O. T. and Hansen, T. 2004. Effects of pre-smolt photoperiod regimes on post-smolt growth rates of different genetic groups of Atlantic salmon (Salmo salar). Aquaculture, 242, 671-688.
16. Svåsand, T., Agnalt, A.-T., Skilbrei, O. T, Borthen, J., and Heggberget, T. 2004. An integrated development programme for marine stocking: the Norwegian example. In: Bartley, D. M., and Leber. K.M. 2004 (eds), Marine ranching. FAO Fisheries Technical paper 429. 19-72.
17. Glover, K. A., Skilbrei, O. T. and Skaala, Ø. 2003. Stock-specific growth and length frequency bimodality in brown trout (Salmo trutta L.). Transactions of the American Fisheries Society 132: 307-315.
18. Sægrov, H and Skilbrei, O. T. 1999. Can stocking programs affect the predator stocks and decrease the survival of the wild Atlantic salmon juveniles? -Pp. 182-188: in Howell, B.R., Moksness, E. & Svåsand, T. (eds). First International Symposium on Stock Enhancement and Sea Ranching, Bergen, Norway, 8-11 September. Fishing News Book, Blackwell Science Ltd. 182-188.
19. Svåsand, T., Skilbrei, O. T., Holm, M. & Van Der Meeren , G. 1998. Morphological and behavioural differences between reared and wild individuals: Implications for sea ranching with Atlantic salmon, Salmo salar L., Atlantic cod, Gadus morhua L., and European lobster, Homarus gammarus L. Fisheries Management and Ecology 5, 473-490.
20. Skilbrei, O. T. and Holm, M. 1998. Effects of long-term exercise on survival, homing and straying of released Atlantic salmon (Salmo salar) smolts. Journal of Fish Biology, 52: 1083-1086.
21. Skilbrei, O. T., Hansen, T and Stefansson, S.O. 1997. Effects of decreases in photoperiod on growth and bimodality in Atlantic salmon Salmo salar L. Aquaculture Research 28: 43-49.
22. Skilbrei, O. T., Holm, M., Jørstad, K., Handeland, S. O. 1994. Migration motivation of cultured Atlantic salmon, Salmo salar L., smolts in relation to size, time of release and acclimatization period. Aquacult. Fish. Manag. 25: 65-77.
23. Skilbrei, O. T., Jørstad, K., Holm, M., Farestveit, E., Grimnes, A. and Aardal, L. 1994. A new release system for coastal ranching of salmon and behavioural patterns of released smolts. Nord. J. Freshw. Res. 69: 84-94.
24. Skilbrei, O.T., 1991. Importance of threshold length and photoperiod for the development of bimodal length-frequency distribution in Atlantic salmon (Salmo salar). Can. J. Fish. Aquat. Sci.: 2163-2172.
25. Skilbrei, O.T. 1990. Developmental rates of Atlantic salmon (Salmo salar) in culture; general patterns and influences of light and temperature. Dr. philos. thesis., Institute of Fisheries and Marine Biology, Universtity of Bergen, 200 pp.
Skilbrei, O.T. 1990. Compensatory sea growth of male Atlantic salmon, (Salmo salar L.), which previously mature as parr. J. Fish.Biol. 37: 425-436.
26. Skilbrei, O.T. og J.C. Holm. 1989. Growth, sexual maturation and anadromuous potential in three Norwegian strains of Arctic charr (Salvelinus alpinus). Physiol. Ecol. Japan, Spec. Vol 1: 546.
27. Skilbrei, O.T, 1989. Relationships between smolt length and growth and maturation in sea of individually tagged Atlantic salmon (Salmo salar). Aquaculture 83: 95-108.
28. Skilbrei, O.T. 1988. Growth pattern of pre-smolt Atlantic salmon (Salmo salar L.): the percentile increment method (PIM) as a new method to estimate length-dependent growth. Aquaculture, 69: 129-143.