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Distribution, Abundance and Population Ecology of Ashtoret lunaris (Forskel, 1775) and Matuta planipes Fabricius, 1798 from the Sonmiani Bay (Lagoon), Pakistan

Distribution, Abundance and Population Ecology of Ashtoret lunaris (Forskel, 1775) and Matuta planipes Fabricius, 1798 from the Sonmiani Bay (Lagoon), Pakistan

Noor Us Saher1, Zunaira Amanat2, M. Asif Gondal3 and Naureen Aziz Qureshi4,*

1Centre of Excellence in Marine Biology, University of Karachi, Karachi 75270, Pakistan.
2Department of Zoology, Federal Urdu University of Arts, Science and Technology, University Road, Karachi, Pakistan.
3Department of Biosciences, COMSATS Institute of Information Technology, Park Road, Islamabad, Pakistan
4Government College Women University, Faisalabad, Pakistan

* Corresponding author: naureenaziz.qureshi@gmail.com; noorusaher@yahoo.com

ABSTRACT

Matuta planipes and Ashtoret lunaris were collected as a part of by catch of gillnet deployed for shrimps from April 2005 to March 2007 in Sonmiani Bay waters (Miani Hor lagoon). M. planipes was found abundantly in Sep. 2005, Nov. - Dec. 2005 and Dec. 2006 (93.3%, 94.7%, 92.3% and 87 % respectively). A. lunaris was found in abundance during May 2005 (85.7%) and Aug. 2005 (81.8%). Male specimens of both species (M. planipes: χ2 = 245.4, P < 0.005) and (A. lunaris: χ2 = 99.4, P<0.005) were significantly more than females throughout the study period. There was a significant difference in size of male and female crabs within sexes; (M. planipes: t = -4.93, P < 0.005) and (A. lunaris: t = -2.92, P<0.005). Various morphometrical relationships were demonstrated that the males of M. planipes and A. lunaris were larger in size and heavier than females (4.34g ± 0.9g; 14.86 ± 6.8g and 3.87g ± 0.6g; 11.66 g ± 5.4 g) respectively. There was a negative allometry for both male and females of M. planipes and A. lunaris for length and weight relationship. The estimated carapace size at onset of sexual maturity was 3.2 cm and 3.3 cm for males and females of A. lunaris whereas, males and females of M. planipes had sexual maturity carapace size 3.1 cm and 3.2 cm in lagoon waters of Sonmiani bay.

 

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