The impact of breeding on productivity of Atlantic Salmon and Rainbow Trout farming

Presentation by: Ana Leonardo (49081) and Francisca Felix (50287) Master students in Aquaculture and Fisheries, Algarve University

Obstacles

Advantages

•control artificial reproduction;

•control mating;

•Difficulties of hatching and feeding larvae and fry.

•High fertility;

•External fertilization;

•Low expenses for broodstock maintenance;

•More efficient breeding programmes design.

Examples of phenotypic traits of economic importance

Food conversion efficiency

Growth rate

Age at sexual maturity

Survival/disease resistance

Body quality

Fecundity

Breeding strategies

Inbreeding

Crossbreeding

Purebreeding

Inbreeding

“It is as important to prevent production losses due to inbreeding, as it is to increase production from genetic enhancement.”(Dunham et al., 2001)

Pure breeding

Sex manipulation

Main problems

Environmental

Research

Economic and consumer issues

Political issues

Ethics

65% of all the salmon and rainbow trout produced in Norway is genetically improved fish.

Norway

Gene bank in Norway

Programs for conservation and/or harvest

Mixed-milt fertilizations

Wild-breeding

Captive-breeding

In wild Salmo salar populations

Problems in river management Impact in wild populations

Genetic profile of wild populations

Decreases populations productivity

Tummel River’s Case

Impact in Fisheries

Final concerns

New informations of breeding consequences will be provided as generations of Salmo salar and Oncorynchus mykiss appear;

Efforts to avoid the escape of farmed fish must be made;

New alternatives must arrise, since many exploration sites still use milt-mixed fertilizations.

THANKS

References

• Dunham, R. (1996). Results of early pond-based studies of risk assessment regarding aquatic GMOs. 126th Annual Meeting of the American Fisheries Society, Dearborn, MI, August 26-29 1996. Abstract No. 381; • Dunham, R.A., Majumdar, K., Hallerman, E., Bartley, D., Mair, G., Hulata, G., Liu, Z., Pongthana, N., Bakos, J., Penman, D., Gupta, M., Rothlisberg, P. & Hoerstgen-Schwark, G. (2001). Review of the status of aquaculture genetics. In R.P. Subasinghe, P. Bueno, M.J. Phillips, C. Hough, S.E. McGladdery & J.R. Arthur, eds. Aquaculture in the Third Millennium. Technical Proceedings of the Conference on Aquaculture in the Third Millennium, Bangkok, Thailand, 20-25 February 2000. pp. 137-166. NACA, Bangkok and FAO, Rome;•Monahan, R. L. (1993). An Overview Of Salmon Aquaculture. In Salmon Aquaculture, edited by K. Heen, R. L. Monahan and F. Utter, 1-9. England: Fishing News Books.•Myhr, A.I. & Dalmo, R.A. (2004). Introduction of genetic engineering in aquaculture: ecological and ethical implications for science and governance. Aquaculture 250: 542-554; • Rudolfsen, G., Figenschou, L., Folstad, I., Tveiten, H., Figenschou, M., (2006). Rapid adjustments of sperm characteristics in relation to social status. Proceedings of the Royal Society B 273: 325–332;• Shearer, W.M. (1992). The Atlantic Salmon: Natural History, Exploitation and Future Management. Fishing News Book;•Wedekind, C., Rudolfsen, G., Jacob, A., Urbach, D. & Muller, R. (2007). The genetic consequences of hatchery-induced sperm competition in a salmonid. Biological conservation 137: 180-188;