FINE-STRUCTURE OF SPERMATOZOA OF 4 LITTORAL TELEOSTS SYMPHODUS-OCELLATUS, CORIS-JULIS, THALASSOMA-PAVO AND CHROMIS-CHROMIS

The sperm types of four littoral teleost fish of the labrid species Sy mphodus ocellatus, Coris julis and Thalassoma pavo, and of the pomacen trid species Chromis chromis were studied by scanning and transmission electron microscopy. The spermatozoa of the investigated species are simple organized and acrosomeless. In Coris julis the sperm head is sp herical, the flagellum inserts cranio-laterally at the nucleus, and th e cylindrical midpiece contains four mitochondria. In Thalassoma pave the sperm head is ovoid, the flagellum inserts cranio-laterally at the nucleus, too, and the cylindrical midpiece contains three mitochondri a. In Symphodus ocellatus the head is ovoid and the flagellum inserts in a deep, central nuclear notch. In the cylindrical midpiece five sph erical mitochondria are arranged around the flagellum. Also the centri olar complex of Symphodus ocellatus, Coris julis and Thalassoma pavo r eveals differences. The head of spermatozoa of Chromis chromis is kidn ey-like shaped and the flagellum inserts in a slight, central nuclear invagination. The centriolar complex has particular anchoring structur es, the coarse and satellite fibres. The ellipsoidal midpiece contains six mitochondria and has no cytoplasmic channel.