Author/Authors :
Chaichi ، A. R نويسنده Graduate School of Marine Science & Technology, Department of Marine Biology, Science and Research, Islamic Azad University, Tehran- Iran , , Vosoughi ، G. h نويسنده Graduate School of Marine Science & Technology, Department of Marine Biology, Science and Research, Islamic Azad University, Tehran- Iran , , Kaymaram ، F نويسنده Iranian Fisheries Research Organization, P.o.Box:14155-6116, Tehran, Iran , , Jamili ، S نويسنده Graduate School of Marine Science & Technology, Department of Marine Biology, Science and Research, Islamic Azad University, Tehran- Iran-Iranian Fis , , Fazli ، H نويسنده Ecologic Research Organization of Caspian Sea, Sari, Iran ,
Abstract :
برخي از خصوصيات توليد مثلي ماهي سياه كولي Vimba vimba persa ) ( از مهر ماه سال 1387 تا شهريور ماه سال 1388در آبهاي ساحلي درياي خزر (آبهاي استان مازندران) مورد مطالعه قرار گرفت. تعداد كل 994 نمونه ماهي به صورت ماهانه از 6منطقه صيادي رامسر ، تنكابن ، چالوس ، محمود آباد ، فرح آباد و اميرآباد جمع آوري گرديدند كه از ميان آنها هماوري 92 نمونه مطالعه شد . بالاترين ميزان فراواني اين آبزي در فصل بهار ( بالاخص فروردين و ارديبهشت) تعيين گرديد. از نظر جنسيت نسبت جنسي 1.35 :1 = M : F محاسبه شد. مرا حل باروري پيشرفته (مرا حل 4 و 5 ) در فروردين و ارديبهشت بدست آمد . بالاترين شاخص گنادوسوماتيك جنس ماده در ارديبهشت ماه و حداقل آن در تير ماه بود. حداكثر ميزان هم آوري مطلق و نسبي بترتيب 34640 و 9/260 محاسبه گرديد .حداقل ميزان هم آوري مطلق و نسبي بترتيب 5400 و 5/94 بود. ميانگين هم آوري مطلق و نسبي به ترتيب 7710±17198 و 8/48±85/171بود .
Abstract :
Some reproduction characteristics of the Caspian Vimba, Vimba vimba persa, were studied from Oct. 2008 to Sep. 2009 in coastal waters of the Caspian Sea (Mazandaran province). 994 specimens were monthly collected from 6 fish landing sites of Ramsar, Tonekabon, Chalus, Mahmood Abad, Sari and Behshahr. The fecundity was measured using 92 specimens. This species was found to have more abundance in spring (especially April and May). The samples composed of 397(42.6%) male, 537(57.4%) female; the sex ratio was M: F = 1:1.35. The advanced stages of maturity (4th & 5th) were found in April and May. The highest Gonadosomatic Index in females was in May and the lowest one was in July. The average of absolute and relative fecundities was 17198±7710 and 171.85±48.8, respectively.
