Asexual and sexual stages in the life cycle of Goussia (Plag~llaJ gadi (Fiebiger, 1913) , pardsites of haddock Melanograrnmus aeglefinus, occur in loose connective hssue between the lobes of the gas gland and in the s\vimbladrier wall. The asexual stages are usually found in the deeper layers, and the sexual stages towards the lumen of the swimbladder. There are many leukocytes in the lumens and walls of the blood vessels of the loose connective tissue, and phagocytes containing degeoerating

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... asites and trophozoites are seen in the surrounding connective tissue. Various stages of the parasite and disintegrating host cells arc released into the lumen of the swimbladder, forming a yellowish exudate. Mt*rozoltos form by sc\.eral generations ol endogenesis. The first generation, in which only 2 daughter meronts are formed (endodyogeny), may occur in the sporozoite after it has been released trom the sporocyst, when it is still within the oocyst membrane; in a free sporozoite, in a trophozoite which may be free ot in a phagocyte. This may be repeated, so that a group of elongate, intertwined merozoiles is formed. A second generation of rosettes of radiating meronts is formed by endopolygeny. usually in vacuoles of host cells which are reduced to a thin rim of vacuolated cytoplasm.