Radwan, N., Mohammad, S., Mohamed, S., Yaseen, A. (2009). Reproduction and gonad development of gastropod Thais carinifera in Lake Timsah, Suez Canal, Egypt. Egyptian Journal of Aquatic Biology and Fisheries, 13(2), 53-67. doi: 10.21608/ejabf.2009.2032
Nancy Radwan; Samya Mohammad; Saad Mohamed; Ahmed Yaseen. "Reproduction and gonad development of gastropod Thais carinifera in Lake Timsah, Suez Canal, Egypt". Egyptian Journal of Aquatic Biology and Fisheries, 13, 2, 2009, 53-67. doi: 10.21608/ejabf.2009.2032
Radwan, N., Mohammad, S., Mohamed, S., Yaseen, A. (2009). 'Reproduction and gonad development of gastropod Thais carinifera in Lake Timsah, Suez Canal, Egypt', Egyptian Journal of Aquatic Biology and Fisheries, 13(2), pp. 53-67. doi: 10.21608/ejabf.2009.2032
Radwan, N., Mohammad, S., Mohamed, S., Yaseen, A. Reproduction and gonad development of gastropod Thais carinifera in Lake Timsah, Suez Canal, Egypt. Egyptian Journal of Aquatic Biology and Fisheries, 2009; 13(2): 53-67. doi: 10.21608/ejabf.2009.2032
Reproduction and gonad development of gastropod Thais carinifera in Lake Timsah, Suez Canal, Egypt
1Department of Zoology, Faculty of Education, El Arish, Suez Canal University, Egypt
2Department of Zoology, Faculty of Science, Port Said, Suez Canal University, Egypt
3Department of marine Biology, Faculty of Sciences, Ismailia, Suez Canal University, Egypt
4Department of Zoology, Faculty of Science, Suez, Suez Canal University, Egypt
Abstract
Gonad development, reproductive cycle and sex ratio of Thais carinifera were studied through a histological investigation of its gonads. Samples of Thais carinifera were monthly collected during the period from February 2007 to May 2008, from Lake Timsah, Suez Canal, Egypt. Staging criteria for the gonad of male and female snails were described. The ovary and testis in both sexes were composed of a number of oogenic follicles and several spermatogenic follicles respectively. Reproductive cycle of Thais carinifera could be categorized into five stages: early active, late active, ripe, fully ripe and partially spawning phase (in males), and, early active, late active, ripe, spawned and spent phase (in females). Sex ratio departed from 1:1 and the males dominated the population.
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