Prevalence and intensity of infection of Cryptocotyle lingua (Creplin) and Diplostomum spathaceum (Rudolphi)--parasitic metacercariae of Baltic cod (Gadus morhua L.).
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Abstract
A parasitological investigation of Baltic cod, caught in the Bornholm Basin, showed that 1.6% were infected by C. lingua (metacercaria) and 22.5% were infected by D. spathaceum (metacercaria). Only the heavily C. lingua infected cod showed discoloured fillets due to metacercariae in the muscle. The highest intensity of infection of D. spathaceum was found in smaller cod, but only minor opaque spots were observed in the infected lenses. The low prevalence of C. lingua is supposed to be a result of the mixing of uninfected eastern cod with some infected western cod. Both cod from the eastern Baltic and part of the cod in the western Baltic are liable to be exposed to infection by D. spathaceum.
对Bornholm盆地捕获的波罗的海鳕鱼进行了寄生虫学调查，结果显示，1.6%的鳕鱼感染了lingua C. (metaceria)， 22.5%的鳕鱼感染了spathaceum D. (metaceria)。只有受舌梭菌严重感染的鳕鱼由于肌肉中有囊蚴而出现鱼片变色。在较小的鳕鱼中发现了最高的感染强度，但在感染的晶状体中只观察到少量的不透明斑点。lingua的低流行率被认为是未感染的东部鳕鱼与一些感染的西部鳕鱼混合的结果。东波罗的海的鳕鱼和西波罗的海的部分鳕鱼都容易受到spathaceum的感染。
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