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The crayfish parasite 'Psorospem'urn haeckeli', which supposedly lncludes several species, is reported for the first t m e from the stone crayfish Austropotamobius torrentium. The infected speclnlens were from the Kamnllach river in Bavana (Germany), a place where A. torrentium and the noble crayfish Astacus astacus have coexisted for more than 20 yr Screening of the mixed crayfish population for P haeckeh revealed that both specles were infected w ~ t h the elongate morphotype of P haeckeli which is typical of A astacus. The dstnbutlon pattern of the parasite was slmilar ln both species; most spores were in the collagenous wall of the blood vessels and the subep~dermal connective tissue underneath the carapace In the noble crayfish there was practically no immune response against P haeckeli, whereas in the stone crayfish ca 10% of the spores were encapsdated by haemocytes, and approximately 1 % were melanised. Since stone crayfish collected from other creeks were free of P haeckeli, we presume that the parasite may have been transmitted to A torrentium from A. astacus.

diseases of aquatic organisms

Occurrence of Psorospermium haeckeli in the stone crayfish Austropotamobius torrentium from a population naturally mixed with the noble crayfish Astacus astacus