Histological study was performed in order to observe gonadal cycle and gametogenic pattern of common top shell Monodonta canalifera at two rocky shores; Buleji and Manora Channel along the Karachi coast. Studies were taken during June 2005 to July 2006 followed by monthly intervals and samples were examined on histological basis. The oocyte diameter of M. canalifera collected from Manora was significantly higher than the specimens of M. canalifera studied from Buleji. The average oocyte diameter of M. canalifera at Manora ranged between 34.67±13.31 to 59.46±18.51µm and that at Buleji it was found between 41.19±11.55 to 49.35±13.98 µm. Generally cytolysis of unshed oocytes was not evident in any of the specimen furthermore ripe females predominated the population throughout the year. The peak maturation activity in females was observed in June (77.78%) and February (90.00%) at Manora and Buleji respectively.
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[Nuzhat Afsar, Ghazala Siddiqui and Zarrien Ayub (2014); Gametogenic cycle of Monodonta canalifera (Lamark, 1801) at two rocky shores of Karachi coast, Pakistan Int. J. of Adv. Res. 2 (8). 0] (ISSN 2320-5407). www.journalijar.com
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