Effects of various types of feed and stocking densities on survival rate, bacteria and water quality in nursing of the tiger prawn (Penaeus monodon Fabricius)
1990
Jitkasem Chanpong
Natural feed, natural feed mixed with microencapsulated diet and mixed microencapsulated diet yielded average survival rates of post larvae 5 of 6.8, 11.0 and 12.6 % respectively. Natural feed mixed with microencapsulate diet caused the highest total munber of Vibrio sp. enumerated from the sea water. Mixed microencapsulated diet caused higher total ammonia and unionized ammonia than the other two types of feed. Average survival rate from zoea 1 to zoea 3 was related to total count of bacteria and total count of Vibrio sp. while the average of survival rate from mysis to post larvae 5 was related to the concentration of un-ionized ammonia and nitrite. Stocking density at a rate of 200,000 nauplius per cubic meter resulted in lower number of Vibrio sp. than the other stocking rate. Concentration of total ammonia and nitrite of stocking rate at 200,000 nauplius per cubic meter was lower than the other densities except during the stage of zoea 2 to mysis 3. Important factors to give good production from high stocking densities of tiger prawn during nursing were good management consisting of feed quality, feeding technique and water quality management.
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