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Faculty and Staff

Cortney L. Ohs, Ph.D.
Associate Professor - Aquaculture
University of Florida
Institute of Food and Agricultural Sciences
School of Forest Resources and Conservation
Program in Fisheries and Aquatic Sciences


60% Research and 40% Extension

 

 

Email: cohs@ufl.edu

Phone: 772-468-3922 ext. 130
Fax: 772-468-3973

Mailing Address:

Indian River Research and Education Center
2199 South Rock Road
Fort Pierce FL 34945 USA


Research Interests: Dr. Ohs joined the SFRC and IRREC faculty in July 2005. His research focuses on marine baitfish production, copepod production, reproduction of marine finfish, and nutrition of fish and crustacean species from larval to adult stages of development. He also has research interests in fish and crustacean physiology, endocrinology, larval nutrition, food science, and marketing.

Extension Programs: Dr. Ohs works with current aquaculture producers to increase the efficiency of their operations and when appropriate, diversifying the number of organisms they culture. He provides information to individuals with interest in aquaculture who are evaluating the possibility of diversifying their farm operations to include production of various aquatic organisms. To increase awareness of aquaculture among youth, he led the development of a curriculum on aquaculture and the aquatic sciences for middle and high school teachers to implement in their classrooms. It is titled Teach Aquaculture.

Courses Taught:

FAS 6932/4932 Introduction to Aquaculture:
The field of aquaculture requires knowledge of subjects including biology, chemistry, water quality, nutrition, disease, engineering, life history, ecology, and husbandry. This course touches on all of these topics and how they are important to aquaculture. This course consists of 20 lectures, 20 quizzes, two exams, supporting literature and photos. The entire course is online in Sakkai format. The lectures are PowerPoint presentations with voice recordings. Topics covered include an introduction to aquaculture, fish biology, water quality, recirculating systems, ponds, net pens, nutrition and feed manufacture, handling and hauling, spawning, disease, prawns/shrimp, catfish, hybrid striped bass, tilapia, salmonids, ornamental fish, clams, and other important species. Co-instructor Jeff Hill.

FAS 6905 Fish and Crustacean Nutrition:
This course consists of 16 lectures and two exams. Lectures use PowerPoint presentations, extension publications, and incorporate chapters of two books. The topics covered include digestive physiology, energy, protein/amino acids, lipids/fatty acids, carbohydrates, vitamins/minerals, feed formulation, feed manufacture, nutrition of broodstock, larvae, catfish, hybrid striped bass, tilapia, Atlantic salmon, marine fish, and digestive physiology and nutrition of shrimp.

Selected Publications:

Cassiano, E.J., C.L. Ohs, C.R. Weirich, N.E. Breen, and A.L. Rhyne. Accepted. Evaluation of larval Florida pompano, Trachinotus carolinus, fed nauplii of the calanoid copepod Pseudodiaptomous pelagicus. North American Journal of Aquaculture.

D’Abramo, L. R., T. Hanson, and C.L. Ohs. Accepted. Pelleted sources of nutrition for the low input farming of the freshwater prawn Macrobrachium rosenbergii in earthen ponds. Journal of the World Aquaculture Society.

Ohs, C.L., A.L. Rhyne, S.W. Grabe, M.A DiMaggio, and E. Stenn. 2010. Effects of salinity on reproduction and survival of the Calanoid copepod Pseudodiaptomus pelagicus. Aquaculture 307: 219-224.

Ohs, C.L., K.A. Chang, S.W. Grabe, M.A. DiMaggio, and E. Stenn. 2010. Evaluation of dietary microalgae for culture of the Calanoid copepod Pseudodiaptomus pelagicus. Aquaculture 307: 225-232.

DiMaggio, M.A., C.L. Ohs, and B.D. Petty. 2010. Evaluation of a point-of-care blood analyzer for use in determination of select hematological indices in the Seminole killifish. North American Journal of Aquaculture 72: 261-268.

DiMaggio, M.A., S.W. Grabe, S.M. DeSantis, and C.L. Ohs. 2010. Induced volitional spawning and larval rearing of pinfish, Lagodon rhomboides. North American Journal of Aquaculture 72: 252-257.

DiMaggio, M.A., C.L. Ohs, S.W. Grabe, B.D. Petty, and A.L. Rhyne. 2010. Osmoregulatory evaluation of Fundulus seminolis following gradual seawater acclimation. North American Journal of Aquaculture 72: 124-131.

Ohs, C.L., S.W. Grabe, S.M. DeSantis, M.A. DiMaggio, and A.L. Rhyne. 2010. Culture of pinfish (Lagodon rhomboides) at different stocking densities and salinities in recirculating aquaculture systems. North American Journal of Aquaculture 72: 132-140.

DiMaggio, M.A., C.L. Ohs, and B.D. Petty. 2009. Salinity tolerance of the Seminole killifish, Fundulus seminolis, a candidate species for marine baitfish aquaculture. Aquaculture 293: 74-80.

Rhyne, A.L., C.L. Ohs, and E. Stenn. 2009. Effects of temperature on reproduction and survival of the calanoid copepod Pseudodiaptomous pelagicus. Aquaculture 292: 53-59.

Ohs, C.L., A.L. Rhyne , and E. Stenn. 2009. Viability of subitaneous eggs of the calanoid copepod, Acartia tonsa (Dana), following exposure to various cryoprotectants and hypersaline water. Aquaculture 287: 114-119.

DiMaggio, M.A., B.D. Petty, and C.L. Ohs. 2008. The parasitic fauna of the Seminole Killifish, Fundulus seminolis, from Lake George, Florida. Bulletin of the European Association of Fish Pathologists 28: 236-242.

Ohs, C.L. and L.R. D’Abramo. 2006. Comparison of early season versus late season trap schedules for harvest of Red Swamp Crawfish Procambarus clarkii cultured in earthen ponds without planted forage. Journal of Shellfish Research 25: 561-564.

Ohs, C.L., L.R. D’Abramo, and A.M. Kelly. 2006. Evaluation of dietary administration of 17alpha - methyltestosterone to freshwater prawn Macrobrachium rosenbergii as a means to control sexual differentiation. Journal of the World Aquaculture Society 37: 328-333.

Ohs, C.L., L.R. D’Abramo, L. Petrie-Hanson, and A.M. Kelly. 2006. Apparent control of sexual differentiation of freshwater prawn Macrobrachium rosenbergii through dietary administration of dopamine hydrochloride. Journal of Applied Aquaculture 18: 19-32.

D'Abramo, L.R., C.L. Ohs, and K.C.E. Elgarico. 2006. Effect of added substrate on production of red swamp crawfish (Procambarus clarkii) in earthen ponds without planted forage. Journal of the World Aquaculture Society 37: 307-312.

D'Abramo, L.R., C.L. Ohs, and T.R. Hanson. 2004. Effect of stocking weight and stocking density on production of hybrid striped bass (sunshine) in earthen ponds in the second phase of a 2-phase system. Journal of the World Aquaculture Society 35: 33-45.

D'Abramo, L. R., C.L. Ohs and K.C. Elgarico. 2003. Production of red swamp crawfish (Procambarus clarkii) in earthen ponds without planted forage: Evaluation of trap and seine harvest strategies. Journal of Shellfish Research 22: 527-531.

D'Abramo, L.R., and C.L. Ohs. 2003. Production of red swamp crawfish (Procambarus clarkii) in earthen ponds without planted forage: establishment, maintenance, and harvest of populations. Journal of Shellfish Research 22: 521-525.

Kovalenko, E.E., L.R. D'Abramo, C.L. Ohs, and R.K. Buddington. 2002. A successful microbound diet for the larval culture of freshwater prawn (Macrobrachium rosenbergii). Aquaculture 210: 385-395.

D'Abramo, L.R., C.L. Ohs, T.R. Hanson, and J.B. Taylor. 2002. Production and economic analysis of two-phase and three-phase culture of sunshine bass in earthen ponds. North American Journal of Aquaculture 64: 103-112.

D'Abramo, L.R., C.L. Ohs, and J.B. Taylor. 2000. Effects of reduced levels of dietary protein and menhaden fish meal on production, dressout and biochemical composition of phase III sunshine bass (Morone chrysops x M. saxatilis) cultured in earthen ponds. Journal of the World Aquaculture Society 31: 316 325.

Ohs, C.L., L.R. D'Abramo, R.K. Buddington, H.R. Robinette, J.M. Roethke. 1998. Evaluation of a spray dried artificial diet for larval culture of freshwater prawn, Macrobrachium rosenbergii, and striped bass, Morone saxatilis. Aquaculture Nutrition 4: 73 82.

 

 

Site maintained by Dr.Cortney Ohs, Ph.D.