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BREEDING PERIODICITY OF THE PADDY FIELD CRAB OZIOTELPHUSA SENEX SENEX (FABRICIUS) (DECAPODA: BRACHYURA), A FIELD STUDY

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ABSTRACT The breeding periodicity of the paddy field crab Oziotelphusa senex senex was determined by direct field observations, by calculating the percentage of ovigerous females, and by histological studies on the nature of the ovary in the crab population of Allur (Nellore District, A.P., India) for three years. The female of this crab is an annual breeder, showing a single peak in June. Vitellogenesis occurs from December to April, spawning from May to July, brooding from July to September, and release of juveniles from September to November. This coincides with northeast monsoons. The smallest ovigerous crab had a carapace width of 3.0 cm (245 eggs), and the largest crab a carapace width of 5.2 cm (445 eggs). The mean incubation period is 47 ± 4 days. The different phases of the reproductive cycle synchronizes with seasonal variations such as temperature, humidity, and rainfall.

10.1163/193724092X00148
/content/journals/10.1163/193724092x00148
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/content/journals/10.1163/193724092x00148
2017-08-21

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