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Fine Structure of Spermatozoa of Three SparidFish: Common pandora, Pagellus erythrinus, GiltheadSea Bream Sparus aurata and Blackspot SeaBream Pagellus bogaraveoG. Maricchiolo 1 , R. Laurà 2 , M.C. Guerrera 2 , V. Micale 1 , U. Muglia 2 , L.Genovese 11, Institute for Coastal Marine Environment, CNR, Messina, Italy2, Department of Morphology, Biochemistry, Physiology and Animal Production, Universityof Messina, Messina, Italygiulia.maricchiolo@iamc.cnr.itAbstractThis study investigates the fine sperm structure of Sparids Pagellus erythrinus,Sparus aurata and Pagellus bogaraveo. Spermatozoa are differentiated into an acrosomelesshead, a short midpiece and a long tail. The head is spherical in P. erythrinus andS. aurata but ovoidal in P. bogaraveo. In all species the nucleus reveals a deep invagination,in which the centriolar complex is located, and a satellite nuclear notchshaped like a club in P. erythrinus and P. bogaraveo and like a bell in S. aurata. Insidethe nuclear notch occurs some electron-dense material in S. aurata is visible across-striated cylindrical body.The two centrioles show a ”9+0” pattern and are oriented perpendicularly to eachother in S. aurata and P. bogaraveo but not in P. erythrinus. The centrioles are linkedto each other, as well as to the nuclear envelope, by electron-dense material. Thedistal centriole is linked to the nuclear envelope by means of a lateral plate and radialfibres in S. aurata and by means of basal feet, radial fibres and necklace in P. bogaraveo.In all species the midpiece houses one mitochondrion. The flagellum contains the“9+2” axoneme, is perpendicularly to the nucleus and shows an unpaired fin in P.erythrinus but none in S. aurata and P. bogaraveo.Knowledges obtained on sperm morphology may be an useful tool in aquacultureproviding important references for evaluation of possible cell damages consequentto either cryopreservation procedures or exposure to contaminants.1 IntroductionSparids (porgies or sea breams) is one ofthe largest Percoidei families, predominantlymarine and distributed in the Atlantic,Indian and Pacific oceans [1].The family includes six subfamilies(Boopsinae, Denticinae, Diplodinae, Pagellinae,Pagrinae and Sparinae) [2] and 33genera with about 115 species [1].Most members of this family are economicallyvaluable, attaining high marketprices. For this reason, a number of them