A protistan endoparasite was d~scovered in the yolk of embryos and larvae of cod Gadus morhua L. from the Baltic. The prevalence of infestation ranged from 0 to 30 ":>. Two stages of the parasite were identified under transmiss~on electron microscopy. One stage was apparently mononucleated; the other stage was multinucleated and seemed to be b r e a k~n g -u p into numerous, mononucleated organisms. The endoparas~te IS compared with the slngle example In the literature of infestat~ons in the yolk of marine fish larvae -caused by the dlnoflagellate lchthyodini~~m chabelardi-and the consequences for larval health are briefly discussed.
Tissues and interstitial compartments of cod Gadus morhua embryos which were infected by an endoparasite in the yolk were investigated by transmission electron microscopy. Small enigmatic organisms, presumed to be of parasitic nature, were observed in the embryonic cells and tissues. The organisms lacked a cell wall. In addit~on to intermediate stages, at least 3 distinct stages of the organism were observed. The organisms were located both extra-and intracellularly, in the latter case often surrounded by vacuoles. The stages of the organism differed in their chromatin configurations. One stage contained groups of finely and coarsely flocculated chromatin without a nucleolemma. Juxtapositioned chromatin groups were separated by annulate lamellae. Another stage had one or more nucleus-like elements, each surrounded by a dilated cisterna with a few pores. The cisternae of such adjoining elements formed annulate lamellae, which could break to form a common vacuole. Vacuoles might then fuse with the outer membrane of the organism thereby freeing the nucleus-like elements as daughter elements. Such daughter elements were observed extra-and intracellularly in embryonic cod. The third stage contained several nucleated daughter cells, and lacked annulate lamellae. The identity of the organism is unknown.
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