Reproduction biology wild common carp (Cyprinus carpio) in the Caspian Sea coast (Mahmoud abad town) Mazandaran province
Subject Areas : Marine BiologyA. Vosooghi 1 , A. Matinfar 2 , T. Maddah 3
1 - Dept. of Fisheries, Faculty of Marine Science and Technology, Islamic Azad University, Tehran North Branch
2 - Iranian Fisheries Science Research Institute, Tehran
3 - Dept. of Fisheries, Faculty of Marine Science and Technology, Islamic Azad University, Tehran North Branch
Keywords: Caspian Sea, Reproductive, Cyprinus carpio, Mazandaran province. age group,
Abstract :
This study was carried out in the southern Caspian Sea water ( Mazandaran province) Mahmooud Abad town on Cyprinus carpio between Ganuary 2006 to Ganuary 2007. The samplings were monthly and speciemens were collected from beach seinecatch in the Mahmooud Abad area. Clocetively . 134 specimen of Cyprinus carpio were obtain. The biometric parameters including:, FL, body weight, aging (using scale), sexuality, gonad weight and maturing stages specimens were determine .Mean of fork length for male and female 39.85±5.45 and 40.59±4.08 respectively and body weight for male and female 961.45±306., 1020.01±320.14 gr recpectively. Age composition of all speciemens ( male and female ) belong to different age groups: 3 (%9 ), 4 (%22.4 ), 5 (%39.6 ), 6 ( %23.9) , 7 (%5.2). We could recognized sexuality in all (134) speciemens . Male provide 48.5 and females 51.5 percent of the catch. The avrage of absolute fecundity was estimated 85245 eggs and the range of relative fecundity was estimated 81747 eggs. in stage of maturation all speciemens were exmined ( 5 stage method ) but only tree stage ( 3 , 4 , 5 ) were observed. The GSI determines that the spawning season commences in the April until the end of summer and autumn and winter the higher levels of GSI and developed classes of ovary maturation were observed in April and May and was reduced which indicate the spawning in this months. The mean Kf for male and for female 1.19±0.12 , 1.29±0.15 respectively.
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