Director, Aquaculture Research Institute
|Credentials:||1978 - Ph.D., University of Washington-Fisheries|
|Mailing Address:||Hagerman Fish Exp Station|
3059 E. National Fish Hatchery Rd.
Hagerman, ID 83332
Fish Nutrition & Reproduction
Age at maturity and fecundity in salmonid species depends upon feeding rate as well as adequate maternal nutrition. Deficiencies of specific nutrients reduce reproductive success, especially in terms of egg fertilization and hatch rates. The carotenoid pigment, astaxanthin, has been demonstrated to be essential in the diet of female Atlantic salmon to produce viable eggs and is likely essential for other salmonid species. Other micronutrients, e.g., omega-3 fatty acids, trace minerals and vitamins, are essential in the diet of fish for successful spawning. Nutritional status of cultured fish, such as those reared in research laboratories or in captive broodstock programs devoted to restoration of threatened or endangered stocks of salmon, is a critical element supporting reproductively performance. As salmonid feeds transition from being based on feed ingredients derived from marine resources to plant-based ingredients, new nutritional challenges arise that impact fish growth, health and maturation. Thus, the connection between fish nutrition and reproductive studies is critical.
Abernathy, J., Brezas, A., Snekvik, K.R., Hardy, R.W. and Overturf, K. 2017. Integrative functional analyses using rainbow trout selected for tolerance to plant diets reveal nutrigenomic signatures for soy utilization without the concurrence of enteritis. PlosOne, 12 (7). E0180972
Villasante, A., Powell, M.S., Moutou, K.A., Murdoch, G.K., Overturf, K., Wacyk, J. & Hardy, R. 2016. Effects of anthocyancyanidins in myogenic differentiation and antioxidant defense in primary myogenic cells isolated from rainbow trout (Oncorhynchus mykiss). Aquaculture 454: 81-89.
Villasante, A., Powell, M.S., Murdoch, G.K., Overturf, K., Cain, K., Wacyk, J. & Hardy, R. 2016. Effects of anthocyancyanidins in myogenic differentiation in induced and non-induced primary myoblasts from rainbow trout (Oncorhynchus mykiss). Comparative Biochemistry and Physiology, Part B: Biochemistry and Molecular Biology 196-197: 102-108.
Overturf, K., Barrows, F.T., Hardy, R.W. Brezas, A. and Dumas, A. 2016. Energy composition of diet affects muscle fiber recruitment, body composition and growth trajectory in rainbow trout (Oncorhynchus mykiss). Aquaculture 457:1-14.
Jirsa, D., Barrows, F.T., Hardy, R.W. and Drawbridge, M. 2014. Alternative protein blends as a replacement for fish meal in diets for white seabass, Atractoscion nobilis. Aquaculture Nutrition DOI: 10.1111/anu.12212.
Thornton, E., Hardy, R.W. and Quinn, T.P. 2015 Experimental determination of the limits of using stable isotopes to distinguish steelhead and rainbow trout offspring. North American Journal of Fisheries Management 35:4, 810-817.
Overturf, K., Barrows, F.T. and Hardy, R.W. 2013. Effect and interaction of rainbow trout strain (Oncorhynchus mykiss) and diet type on growth and nutrient retention. Aquaculture Research 44, 604-611.
Burr, G.S., Wolters, W.R., Barrows, F.T. and Hardy, R. 2012. Replacing fishmeal with blends of alternative proteins on growth performance of rainbow trout (Oncorhynchus mykiss), and early or late stage juvenile Atlantic salmon (Salmo salar). Aquaculture 334-337, 110-116.
Hardy, R.W. 2010. Utilization of plant proteins in fish diets: effects of global demand and supplies of fishmeal. Aquaculture Research 41, 770-776.
Naylor, R., Hardy, R., Bureau, D., Chiu, A., Elliott, M., Farrell, A., Forster, I., Gatlin, D., Goldberg, R., Hua, K. & Nichols, P. 2009. Feeding Aquaculture in an era of finite resources. Proceedings of the National Academy of Sciences, 106(36): 15103-15110.