New Topic Reply
Next Page

1

Previous Page

Thread: Evaluation of Bluegill Production in Recirculating Pond/ Tank Systems

Created on: 04/15/10 07:10 PM

Replies: 0

JanelleLeeChee





Joined: 04/15/10

Posts: 1

Evaluation of Bluegill Production in Recirculating Pond/ Tank Systems
04/15/10 7:10 PM
Attachment: EvalBluegPondTankRecircABST_LeeChee_Madden.pdf

EVALUATION OF BLUEGILL PRODUCTION IN RE-CIRCULATING POND/TANK SYSTEM
*Janelle Lee Chee and Uford A. Madden, DVM, MS, PhD, DABT.
Cooperative Extension Program, College of Engineering Sciences, Technology and Agriculture
Florida A& M University, Tallahassee, FL 32307

*Presenting Author

Fishery biologists faced with many slow growing bluegills in reservoirs may elect to reduce refuge habitat through vegetation control, bolster predator densities or a combination of both. Growth of bluegill is examined by measuring length, weight, and taking a scale sample to determine age. Bluegills can become too dense and grow slowly which results in few individuals attaining desirable size. Liberal harvest is desired in these circumstances where less competition for limited resources leads to faster growth. Pond water with a slight greenish color usually produces fast growing fish. The green color is caused by very small plants called phytoplankton. The phytoplankton is eaten by small animals called zooplankton which are in turn eaten by young bluegill. Ponds without good populations of phytoplankton typically produce slow-growing fish. Phytoplankton grows by using sunlight and nutrients in the pond. Small scale aquaculture farmers have need for information for production systems for their alternative enterprises. The objectives are to determine growth rates, feeding rates and feed efficiency in production of bluegills in tank/pond recirculating system. Four 1000-gallon tanks with dimensions of diameter 8 feet and height 3 feet in a re-circulating tank/pond system in a shed facility with a 60% shade screen were used to investigate bluegill, Lepomis macrochirus, production. Water parameters, dissolved oxygen, pH, and temperature were taken and analyzed along with ambient temperature and shed facility temperature. At day 0, fishes were weighed and measured and water quality parameters, dissolved oxygen, pH, and temperature were taken along with ambient temperature and shed facility and water depth. The animals were fed a 26% protein floating feed at 3.5% of average body weight for two weeks during the acclamation period. Animals in the pond/tank system were fed as follows: Tank 1, 3.5%, Tank 2, 5%; Tank 3, 7.5% of body weight and Tank 4, 10% of body weight. Water quality parameters, dissolved oxygen, pH, and temperature were taken twice per week for two weeks and then once per week along with ambient temperature and shed facility and water depth. At one month intervals, fishes will be weighed and measured. Growth rates, feeding rate and feed efficiency will be evaluated. Research findings will be presented at conference, seminars, and workshops locally and nationally and materials will be prepared to provide information and hands-on training to small and limited resource farmers.

Keywords:
Bluegill, Recirculating pond/tank system, water quality, phytoplankton


[Edit Post]

Link | Top | Bottom

New Topic Reply
Next Page

1

Previous Page

New Post

Please login to post a response.