|Department:||Aquaculture Research Institute, UI|
|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
Reproductive success depends upon adequate nutrition, especially in salmonid fish. Growth rates depend upon feed intake; precocious maturation of male chinook salmon, for example, has been connected with large size at critical periods whereas inadequate feed intake retards growth and delays maturation in both male and female salmonids. Intake levels of specific nutrients is also connected to 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. Offspring from females fed astaxanthin-free diet must receive astaxanthin in their diets are first-feeding fry to prevent death. Other micronutrients, e.g., omega-3 fatty acids, trace minerals and vitamins, have been shown to be essential in the diet of fish for successful spawning. Nutritional status of captively-raised 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. Thus, the connection between fish nutrition and reproductive studies is critical.
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Hardy, R. W., L. L. Oram, et al. (2010). "Effects of dietary selenomethionine on cutthroat trout (Oncorhynchus clarki bouvieri) growth and reproductive performance over a life cycle." Arch Environ Contam Toxicol 58(1): 237-245.
Chapalamadugu, K.C., B.D. Robison, R.E. Drew, M.S. Powell, R.A. Hill, J.J. Amberg, K.J. Rodnick, R.W. Hardy, M.L. Hill, and G.K. Murdoch, Dietary carbohydrate level affects transcription factor expression that regulates skeletal muscle in rainbow trout. Comp Biochem Physiol B Biochem Mol Biol, 2009.
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Drew, R.E., K.J. Rodnick, M. Settles, J. Wacyk, E. Churchill, M.S. Powell, R.W. Hardy, G.K. Murdoch, R.A. Hill, and B.D. Robison, Effect of starvation on transcriptomes of brain and liver in adult female zebrafish (Danio rerio). Physiol Genomics, 2008. 35(3): p. 283-95.
Hardy, R.W. 2008. Farmed fish diet requirements for the next decade and implications for global availability of nutrients. Pp. 1-16 in: Alternate Protein Sources in Aquaculture Diets, C Lim, C.D. Webster and C-S. Lee, editors. The Haworth Press, New York.
Robison, B.D., Drew, R.E., Murdoch, G.K., Powell, M., Rodnick, K.J., Settles, M., Stone, D., Churchill, E., Hill, R.A., Papasani, M.R., Lewis, S.S., Hardy, R.W. 2008. Sexual dimorphism in hepatic gene expression and the response to dietary carbohydrate manipulation in the zebrafish (Danio rerio). Comp Biochem Physiol Part D Genomics and Proteomics 3, 141-154.
Papasani, M.R., B.D. Robison, R.W. Hardy, and R.A. Hill, Early developmental expression of two insulins in zebrafish (Danio rerio). Physiol Genomics, 2006. 27(1): p. 79-85.
Gatlin, D.M. III, Barrows, F. T., Bellis, D., Brown, P., Campen, J., Dabrowski, K., Gaylord, T.G., Hardy, R. W., Herman, E., Hu, G., Krogdahl, Ǻ., Nelson, R., Overturf, K., Rust, M., Sealey, W., Skonberg, D., Souza, E., Stone, D., Wilson, R. and Wurtele, E. (2007). Expanding the Utilization of Sustainable Plant Products in Aquafeeds – A Review. Aquaculture Research 38(6): 551-579.