Aggregation of penaeid shrimp larvae due to microbial epibionts

Pseudomonas piscicida, Aeromonas formicans and Flavobacteria sp. were involved in aggregation of hatchery reared Penaeus stylirostris larvae. Aggregation was experimentally reproduced with pure cultures of these organisms at densities of 10 4 cells per ml. Adding at least 3 μg/ml gentamycin, 10 μg/ml nalidixic acid, 0.1 μg/ml acridine or Cutrine Plus ® ∗ ∗ The use of trade names does not imply endorsement by the authors or institutions which they represent. into test suspensions prevented aggregation of the shrimp larvae.