Dr. Bradley “Kai” Fox


Dr. Bradley Kai Fox

Assistant Extension Specialist

Department of Molecular Biosciences and Bioengineering

1955 East-West Road, Ag. Science 218

Honolulu, HI 96822

Phone: (808) 291-2623

Fax: (808) 956-3542

Email: bradleyf@hawaii.edu

Areas of Interest

Aquaculture, Aquaponics, hydroponics, sustainable agriculture

Integrated agricultural production systems like aquaponics, wherein vegetable and aquacultured organisms are combined, has gained popularity among backyard and commercial producers around the world. Some of the advantages of aquaponics over conventional agriculture include; farming in a relatively small footprint, eliminating the need to lay crop land fallow, elimination of effluent waste containing fertilizer, herbicides, or pesticides, producing food in a certifiably organic way, and increasing productivity with extremely low (about 2-4% of traditional in-ground farming) water use.  Our collaborative research approach at CTAHR aims to further develop and integrate these exciting technologies with renewable energy platforms, advances in plant seeding and grow out techniques, renewable and sustainable fish feed production, and water conservation practices to promote Hawaii’s food independence.

Current Projects


Related Workshops

Selected Publications

Davis, L.K., Fox, B.K., Lim, C., Lerner, D.T., Hirano, T., and E.G. Grau (2010). Effects of 11-ketotestosterone and fishmeal in the feed on growth of juvenile tilapia (Oreochromis mossambicus). Aquaculture 305 (143-149).

Breves, J.P., Fox, B.K., Pierce, A.L., Hirano, T., and E. G. Grau (2010). Gene expression of growth hormone family and glucocorticoid receptors, osmosensors and ion transporters in the gill during seawater acclimation of Mozambique tilapia, Oreochromis mossambicus. Journal of Experimental Zoology Part A: Ecological Genetics and Physiology 313A(7): 432-441.

Breves, J.P., Hasegawa S., Yoshioka M., Fox B.K., Davis L.K., Lerner D.T., Takei Y., Hirano T., Grau E.G.    2010  Acute salinity challenges in Mozambique and Nile tilapia: Differential responses of plasma prolactin, growth hormone and branchial expression of ion transporters.  General and Comparative Endocrinology 167: 135-142.

Fox, B.K., J.P. Breves, L.K. Davis, A.L. Pierce, T. Hirano, and E.G. Grau.    2010  Tissue-specific regulation of the growth hormone/insulin-like growth factor axis during fasting and re-feeding: Importance of muscle expression of IGF-I and IGF-II mRNA in the tilapia.  General and Comparative Endocrinology 166: 573-580.

Davis, L.K., B.K. Fox, C. Lim, N. Hiramatsu, C.V. Sullivan, T. Hirano, and E.G. Grau.    2009 Induction of vitellogenin production in male tilapia (Oreochromis mossambicus) by commercial fish diets.  Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology 154(2):249-54.

Kawatsu, S., K. Sato, Y. Watanabe, S. Hyodo, J.P. Breves, B.K. Fox, E.G. Grau, and N. Miyazaki.    2009  A new method to calibrate attachment angles of loggers in swimming sharks.  EURASIP Journal on Advances in Signal Processing 2010: 1-6.

Fox, B.K., J.P. Breves, T. Hirano and E.G. Grau.  2009 Effects of short- and long-term fasting on plasma and stomach ghrelin, and the growth hormone/insulin-like growth factor-I axis in the tilapia, Oreochromis mossambicus.  Domestic Animal Endocrinology 37(1): 1-11.

Uchida, K., S. Moriyama, J.P. Breves, B.K. Fox, A.L. Pierce, R.J. Borski, T. Hirano and E.G. Grau.  2008 cDNA cloning and isolation of somatolactin in Mozambique tilapia, and effects of seawater acclimation,confinement stress, and fasting on its pituitary expression.   General and Comparative Endocrinology 161(2): 162-170.

Riley, L.G., B.K. Fox, J.P. Breves, H. Kaiya, Dorough, C.P., T. Hirano, E.G. Grau.  2008 Absence of effects of short-term fasting on plasma ghrelin and brain expression of ghrelin receptors in the tilapia, Oreochromis mossambicus  Zoological Science 25: 821-827.

Pierce, A.L., B.K., Fox, L.K. Davis, N. Visitacion, T. Kitahashi, T. Hirano and E.G. Grau  2007  Prolactin receptor, growth hormone receptor, and putative somatolactin receptor in Mozambique tilapia: Tissue specific expression and differential regulation by salinity and fasting.  General and Comparative Endocrinology 154: 31-40.

Fox, B. K., L.G. Riley, Dorough, C., H. Kaiya, T. Hirano and E. G. Grau  2007.  Effects of homologous ghrelins on the growth hormone/insulin-like growth factor-I axis in the tilapia, Oreochromis mossambicus  Zoological Science 24(4): 391-400.

Fox, B. K., T. Naka, K. Inoue, Y. Takei, T. Hirano and E. G. Grau  2007.  In vitro effects of homologous natriuretic peptides on growth hormone and prolactin release in the tilapia, Oreochromis mossambicus.  General and Comparative Endocrinology 150: 270-277.

Fox B. K, L. G. Riley , T. Hirano  and E. G. Grau 2006.  Effects of fasting on growth hormone, growth hormone receptor and insulin-like growth factor-I axis in seawater-acclimated tilapia, Oreochromis mossambicus. General and Comparative Endocrinology 148(3):340-7.

Bellinger, F.P., B.K. Fox, W.Y. Chan, L.K. Davis, Andres, M.A., T. Hirano , E.G. Grau, and I. Cook.  2006.  Ionotropic Glutamate Receptor Activation Increases Intracellular Calcium In Prolactin-Releasing Cells Of The Adenohypophysis  American Journal of Physiology-Endocrinology and Metabolism 291(6):E1188-96.

Riley, L. G., Fox, B. K., Kaiya, H., Hirano, T., and E.G. Grau  2005.  Long-term treatment of ghrelin stimulates feeding, fat deposition, and alters the GH/IGF-I axis in the tilapia, Oreochromis mossambicus  General and Comparative Endocrinology 142(1-2):234-40.

Extension Publications

R.C., Klinger-Bowen, C.S. Tamaru, B.K. Fox, K. McGovern-Hopkins, and R. Howerton.  Testing Your Aquaponic System Water: A Comparison of Commercial Water Chemistry Methods.  College of Tropical Agriculture and Human Resources and the Center for Tropical and Subtropical Aquaculture (CTSA).

Fox, B. K., R. Howerton, and C.S. Tamaru.  Construction of Automatic Bell Siphons for Backyard Aquaponic Systems.  College of Tropical Agriculture and Human Resources. Biotechnology, BIO-10.

Hollyer, J., C.S. Tamaru, A. Riggs, R. Klinger-Bowen, R. Howerton, D. Okimoto, L. Castro, T. Benny Ron, B.K. Fox, V. Troenger and G. Martinez. On-Farm Food Safety: Aquaponics. College of Tropical Agriculture and Human Resources. Food Safety and Technology, FST-38.