International Journal of Fisheries and Aquaculture Sciences

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Population Structure of Freshwater Crab P. Masoniana (Henderson) in the Lower Reaches of Chenab River, J&k State, India


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1 Department of Zoology, University of Jammu, Jammu
     

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The population structure of freshwater crab of Paratelphusa masoniana (Henderson) was studied in the lower reaches of river Chenab in J&K, India. Crabs were randomnly sampled on monthly basis from June 2010-May 2011, a total of 581 crabs were obtained of which 283 (48.37%) were males and 302 (51.62%) were females. The overall sex ratio was found to be 1:1.07 indicating that females were numerically more in compared to males. However sex ratio never remain constant but exhibited fluctuation pattern throughout year especially in the month of June-July and December- January when it was recorded to be almost less than unity (1:0.40, 1,1:0.6 and 1:0.55 respectively). The present population represents non normal size frequency distribution with male reaching greater size (5-6 cm cw) than females (4-5 cm cw).

Keywords

Paratelphusa Masoniana (henderson), Population Structure, Sex Ratio
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  • Population Structure of Freshwater Crab P. Masoniana (Henderson) in the Lower Reaches of Chenab River, J&k State, India

Abstract Views: 694  |  PDF Views: 2

Authors

Kuldeep K. Sharma
Department of Zoology, University of Jammu, Jammu
Rakesh Kumar Gupta
Department of Zoology, University of Jammu, Jammu

Abstract


The population structure of freshwater crab of Paratelphusa masoniana (Henderson) was studied in the lower reaches of river Chenab in J&K, India. Crabs were randomnly sampled on monthly basis from June 2010-May 2011, a total of 581 crabs were obtained of which 283 (48.37%) were males and 302 (51.62%) were females. The overall sex ratio was found to be 1:1.07 indicating that females were numerically more in compared to males. However sex ratio never remain constant but exhibited fluctuation pattern throughout year especially in the month of June-July and December- January when it was recorded to be almost less than unity (1:0.40, 1,1:0.6 and 1:0.55 respectively). The present population represents non normal size frequency distribution with male reaching greater size (5-6 cm cw) than females (4-5 cm cw).

Keywords


Paratelphusa Masoniana (henderson), Population Structure, Sex Ratio

References