Parasitological survey of sharpsnout seabream Diplodus puntazzo (Cetti, 1777) reared in sea cages in Sardinia (western Mediterranean).

摘要

From December 2000 to January 2002, 109 specimens of sharpsnout seabream Diplodus puntazzo from a sea cage in the Gulf of Olbia (Sardinia, western Mediterranean) were examined for parasites. A total of five species were found: the myxosporeans Ceratomyxa diplodae and Enteromyxum leei, the monogeneans Lamellodiscus ignoratus and Atrispinum salpae and the crustacean Lernanthropus brevis. During the sampling two mortality outbreaks were recorded. The first was in winter 2001, with daily mortalities of 0.19%-0.22% (11.5% cumulative), associated with high prevalence and intensity of A. salpae. The second took place during the summer-autumn period 2001, with daily mortalities of 0.25%-0.34% (25% cumulative), associated with E. leei infections. The results showed that the success of netpen rearing of sharpsnout seabream is partly related to the absence of parasitic infections, particularly considering the pathogenicity of species such as E. leei and A. salpae, their direct diffusion in the wild and the lack of approved therapies..