Biometric Study, Condition Factor and Biochemical Composition of the Blue Crab Callinectes sapidus Rathbun, 1896

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Somaia Mosad Zakzok
Mohamed Mahmoud Tawfik
Samya Hussein Mohammad
Rabab Mohamed Alkaradawe


Callinectes sapidus is one of the most important and valuable crabs worldwide, including the Egyptian fisheries. This study was carried out to provide baseline data, namely morphometric and weight relationships, condition factor, and biochemical composition of the blue crab population in Manzala Lake, Mediterranean Sea, Egypt. Samples were collected between March 2019 and February 2020, and data were analyzed seasonally. Male crabs were significantly more abundant and heavier than females. The majority of specimens (69 %) had carapace width in the range from 70 to 109.9 mm, while the 30-49.9 mm class represented only 1.12 %. The overall sex ratio of C. sapidus was in favor of males (1.41:1). The correlation between gonadosomatic index (GSI) and hepatosomatic index (HSI) was moderate to weak (r2 = 0.52 in males and r2 = 0.32 in females). Biometric analysis showed a tendency toward negative allometric growth. Males exhibited some isometric growth, but only in the CL-BW relationship (b = 3.02). Females exhibited significantly higher condition factor than males (p<0.01). However, the differences in biochemical composition of muscle between male and female blue crabs were statistically insignificant (p>0.05). A comparison of the present results with those from different localities is also presented.


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