A research on Plesiomonas shigelloides infection in some aquarium fishes

This study was carried out to determine the reason of fish deaths in some aquarium fishes belongs to aquarium fish rearing farms in Istanbul province. Sick guppies (Poecilia reticulata) showed emaciation, ascites and fin rot. In necropsy, pale liver and kidney, darkened spleen and swollen bile duct were noticed. Ten sick fish samples included guppies, cichlids (Aulonocara maylandi) and swordtails (Xiphophorus helleri) were obtained from three aquarium fish rearing farms. Bacteriological inoculations were made on TSA from the visceral organs of sick fish such as liver, kidney and spleen. The antimicrobial susceptibility tests were performed using nine sorts of antimicrobial agents. According to bacteriological findings, three bacterial isolates obtained infected guppy fish were identified as Plesiomonas shigelloides. They were motile, sensitive to vibriostat (0/129), and produced white colonies on the TSA. Aeromonas hydrophila ve Pseudomonas sp. strains were also identified from other sick fish. Antimicrobial agent susceptibility results showed that three isolates of bacteria were sensitive to only compound sulphonomides of nine sorts of antimicrobial agents