Pasteurella Infection in Young Black Seabream

Abstract

At the middle of July, 1979, a bacterial infection occurred in a young population of black seabream (Acanthopagrus schlegeli) cultured in three tanks. These fish had been reared in sea water tanks since they hatched out at the end of May. The epizootic broke out in all tanks, lasted about one month, and killed 3300 fish out of 8000 (41% mortality).
The causative agent isolated from liver or kidney materials of all the fish examined was identified as Pasteurella piscicida by comparing the characteristics of the present isolates with that of the isolates from black seabream by MUROGA et al. (1977)
The source of the infection was thought to be the sea water supplied to the tanks because of the frequent occurrence of Pseudotuberculosis (P. piscicida infection) in yellowtail (Seriola quinqueradiata) in adjacent area.