نوع مقاله : مقاله پژوهشی
نویسندگان
1 ساری
2 تهران
چکیده
کلیدواژهها
عنوان مقاله [English]
نویسندگان [English]
In this study, gametogenesis of sharp-nose mullet (Liza saliens) was investigated bassed on morphological and histological characteristics. For this purpose, about 150 specimen of this species were collected from beach-seine nets in the southern Caspian Sea and were transferred to the laboratory for futher examinations on gonads. The gonad development was classified to 6 different stages consist of:
stage I: The oocytes small, colourless with a big nucleus.
stage II: The low increase in size of oocytes; globular yolk of nucleus appearing.
stage III: Blood vessels are appearing on the ovary; the oocytes are in the primary vitellogenesis stages; vacules and zona radiata are seen around them.
stage IV: The ovules can be easily observed with naked-eyes, vitellogenesis are complete and oocytes are mature.
stage V: Oocytes are in maximum growth, nucleus migrating towards animal pole; spawning occures in this stage.
stage VI: This stage is after spawning, ovary contains empty follicles.
Based on this study, the stage of I to III were observed in August to April; stage of IV in May and June; stage of V in June and July and stage VI in August.
کلیدواژهها [English]
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