Title: Effect of daily minimum dissolved oxygen concentration on production of channel x blue hybrid catfish Author
Submitted to: Book of Abstracts Aquaculture America
Publication Type: Abstract Only
Publication Acceptance Date: November 16, 2010
Publication Date: February 28, 2011
Citation: Green, B.W. 2011. Effect of daily minimum dissolved oxygen concentration on production of channel x blue hybrid catfish [abstract]. Book of Abstracts Aquaculture America. p.192. Technical Abstract: As the channel x blue hybrid catfish is stocked by an increasing number of catfish farmers, it is important to quantify the production response of this fish to pond dissolved oxygen management strategies. The purpose of this study was to quantify the production and water quality responses of the channel x blue hybrid catfish exposed to a range of daily minimum dissolved oxygen concentrations. Channel (Jubilee strain) x blue (D & B strain) hybrid catfish fingerlings (average weight = 46 g/fish) were stocked into 16 0.1-ha earthen ponds at 15,169 fish/ha. Fish were fed daily as much 32% protein feed as they would consume in 20 min. Four replicate ponds were assigned randomly to each minimum dissolved oxygen concentration treatment. Minimum dissolved oxygen concentration in each pond was maintained by an electric paddlewheel aerator (11.2 kW/ha) that was activated by datalogger to maintain a minimum dissolved oxygen concentration of 12%, 24%, 36%, or 48% saturation. Water quality was monitored throughout the experiment. Growth of channel x blue catfish was impacted by dissolved oxygen concentration. Fish in the high oxygen treatment consumed more feed and grew faster than those in the low oxygen treatment.