Study of metazoan parasites of Scomberomorus commerson and Thunnus tonggol in coastal waters of Hormozgan province

Parasites of two commercial tuna fish including Scomberomorus commerson and Thunnus tonggol were investigated in Bandar Abbas coast during summer and autumn. A total of 84 fish of both species were captured. Based on the results, samples of S. commerson were infected with manogenean parasites, while T. tonggol did not show any of infection. The identified monogeneans include Gotocotyla acanthura, G. bivaginalis, G. queenslandici, Cathucotyle cathuaui, Pseudothoracocotyle ovalis, T. crocea and Pricea multae. Digenean parasites isolated from both hosts belong to the genera Plerurus, Lecithochirium, Ectenurus and Erilepturus. Callitetrarhynchus sp. was the only cestode observed in studied fishes. Obtained nematodes belong to Goezia, Hysterothylacium and Camallanus genera. The highest prevalence of contamination in S. commerson is related to monogenan parasites with 98.72% and the lowest is in cestodes with 0.26%. The prevalence of infection in S. commerson with digenea and nematoda is 5.6%. In T. tonggol, the highest percentage of infection was related to nematods and the lowest in cestode, 59.59% and 12.95% respectively.