Grey-mullet are heterosexual fish and gonochorism is the general rule. Cytological cnalysis of sex-differentiation was studied by light microscopy (Stenger, 1959 ; Leray, 1968 ; Thong, 1969 ; Cassifour, 1975), but germ-cell characteristics were not sufficiently defined at this level and no distinction could be made between primordial germ-cells, oogonia and spermatogonia. Electron microscopy ha...

The aim of this study was to evaluate the effects three fresh-water samples with different hardness values (25, 250, and 750 mg L-1 CaCO3) a control (sea water salinity 15% 2500 ± 130.9 on Mugil liza (mullet) juveniles by conducting long-term test (for 50 days). Zootechnical performance [weight gain (WG), feed conversion rate, specific growth survival (%)], stress indicator parameters (glucose)...

Between January and August 2002, a total of 74 fishes belonging to nine species (Alburnus caeruleus, Barbus luteus, B. sharpeyi, Carassius auratus, C. carassius, Ctenopharyngodon idella, Cyprinus carpio, Hypophathalmichthys molitrix Liza abu) were collected from three fish farms south Baghdad. Twenty-six parasites observed.They following : Three protozoa ( Ichthyophthirius multifiliis , Trichot...