Length-weight and width-weight relationship of spiny rock crab Thalamita crenata (Crustacea, Decapoda, Portunidae) in Panjang Island Banten Indonesia.

This research performed to determine length-weight and width-weight relationship of spiny rock crab (Thalamita crenata) caught at Panjang Island. The total number (1,368 crabs) used as sample consists of 838 males and 530 females. Carapace length has significant correlation with weight, where r2 for males and females are 82.36% and 71.50% respectively. The correlation of length-weight and widthweight relationship at males is higher than females because many crabs still at maturity stage. The ovarian stage will affect to total mass tremendously. T-student analysis that shows growth pattern for males is isometric and negative allometric for females, with b value of males 3.0278 and females 2.729. It also means the male crabs are heavier than the females.

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