Effects of Stocking Levels on Growth and Survival of Pla Duk Dan Larvae in Aquaria

Abstract

A study was conducted to evaluate the effect of different stocking levels on survival and growth rates ofpla duk dan during their critical stage in aquaria with no supplemental or emergency aeration. Twenty 75-liter aquaria were arranged into five treatments which were stocked with 0.05 g pla duk dan larvae at each of the following rates : 500, 1,000 , 1,500 , 2,000 , 2500 per aquarium. The fish were fed a 40% protein moist pellet at 20% of fish body weigh per day for six days a week, and the daily feed allowance was weekly adjusted. For a two -month period of feeding,higher stocking rates resulted in greater weight gains per aquarium,slightly lower but not statistically different weight gains per fish and survival values.