Bacteriological Character in the Culture Water of Penaeid, Homarid and Palinurid Larvae

Abstract

Growth and development of crustacean larvae were affected by microflora associated with microalgae in water. The microflora in the culture water for larvae of penaeid, homarid and palinurid was compared. Penaeus japonicus larvae were cultured at 24.5-28°C, being fed on diatoms, Nannochloropsis sp., Tetraselmis sp., artificial micro-diet and Artemia nauplii. Homarus americanus larvae were cultured at about 20°C, being fed on Artemia. Jasus edwardsii phyllosomas were cultured at about 20°C, being fed on Artemia nauplii and Mytilus edulis. The total viable count in the culture water of penaeid and homarid larvae were higher than those of phyllosomas. Bacteria which produce pale white and white pigments were predominated in the culture water of homarid and palinurid. In addition to these bacteria, yellow, orange and swarming colonies forming bacteria were detected in the penaeid culture water in particularly. Feeding behaviour of phyllosomas became less active and mortality occurred, when swarming bacteria were detected. The phyllosomas were more sensitive to the presence of bacteria than the penaeid and homarid larvae. © 1991, The Japanese Society of Fisheries Science. All rights reserved.