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Survey on fecundity and reproductive indices of the female narrow-clawed Crayfish (Astacus leptodactylus) in Aras Dam Lakeunder natural conditions
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Seyed-Mehdi Mirheydari   , Abbas Matinfar , Mehdi Soltani , Abolghasem Kamali , Yousefali Asadpour-Ousalou |
| Faculty of Agriculture and Natural Resources, Science and Research Branch, Islamic Azad University, Tehran, Iran |
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Abstract: (5624 Views) |
| This study was carried out with the aim of examining the seasonal fecundity and developmental characteristics of the eggs of the female narrow-clawed Crayfish (Astacus leptodactylus)from Aras Dam Lake, Western-Azerbaijanduring 2011. A positive correlation was found between both ovarian and pleopodal fecundity and female size. The mean value of ovarian eggs and Pleopodal fecundity was 206.55 and 129.5, respectively. Pleopodal fecundity was 37.3% lower than ovarian fecundity. The value of the gonadosomatic index (GSI) in females sampled on November was 13.53% (11.63 - 15.91%). The average size of pleopodal eggs diameter was 2.2 mm (1.07 - 6.59 mm). The number of eggs attached to 3rd and 4th pairs of pleopods was significantly higher than other pleopods. The egg number and gonadosomatic index increased significantly with female size (P<0.05). Histological analysis showed the ovarian oocytes of A.leptodactylus developed as asynchronous form. |
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| Keywords: Astacus Leptodactylus, Pleopodal Fecundity, Ovarian Fecundity, Egg Weight, Egg diameter, Aras Dam |
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Full-Text [PDF 535 kb]
(1778 Downloads)
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Type of Study: Research |
Subject:
Special
Received: 2014/05/3 | Accepted: 2014/05/3 | Published: 2014/05/3
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