Abstract.A study of the actinosporean fauna of oligochaetes from a freshwater salmon farm in Northern Scotland was carried out from October 1996 to August 1998. Following the examination of 28,387 oligochaete worms belonging to the families Tubificidae, Lumbriculidae, Naididae and Enchytraeidae, five types of echinactinomyxon (four previously described), six types of raabeia (five previously described), three types of synactinomyxon (all previously described), four types of aurantiactinomyxon (three previously undescribed), one type of triactinomyxon (previously described), one type of neoactinomyxum (previously undescribed) and one type of siedleckiella (previously undescribed) were identified. The triactinomyxon type was released from unidentified immature oligochaetes. Of the twenty-one types of actinosporeans found, thirteen types were released from Tubifex tubifex (Müller), three types were released from Lumbriculus variegatus (Müller), three types from both L. variegatus and T. tubifex and two types from immature oligochaetes.

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This is the first study on parasite fauna of Mytilus galloprovincialis Lamarck, 1819 in Turkish waters. Mussel samples were collected monthly at 3 sampling stations on the coast of Sinop on the Black Sea in the period between August 2012 and July 2013. A total of 1740 mussels were examined for parasites using standard parasitological investigation procedures. The parasites identified included the following: 2 protozoans, Nematopsis legeri (32.12%) and Peniculistoma mytili (6.72%); 1 turbellarian, Urastoma cyprinae (6.32%); 1 trematode, Parvatrema duboisi (4.54%); and 1 polychaeta, Polydora ciliata (2.24%). All identified species are illustrated in figures and constitute new records of Turkish parasite fauna

The life cycle of Sphaerospora truttae (Myxozoa: Myxosporea) and some features of the biology of both the actinosporean and myxosporean stages 'University of Stirling, Institute of Aquaculture, Stirling FK9 4LA, Scotland. UK 20ndokuzmayis Universitesi. Su ~r i i n l e r i Fakiiltesi. 57000 Sinop, Turkey ABSTRACT A previously undescnbed echinactinomyxon type actinosporean was shown experimentally to be the alternate stage of Sphaerospora truttae. The echinactinomyxon type spores were found to be released from Lumbriculus variegatus and occasionally Tubifex tubifex. Overall ~nfection prevalence of the echinactinomyxon was 0.14%. Peak release was in March-May each year S. truttae spores developed in experimentally infected salmon 4.5 mo post-exposure to echinactinomyxon spores. Extrasporogonic stages of S. truttae first appeared in naturally infected salmon in early July and persisted for 8 to 10 wk. Correlation between peak release of echinactinomyxon spores and appearance of extrasporogonic stages of S. truttae is discussed. KEY W O R D S :Sphaerospora truttae -Life cycle .