Size distribution, length-weight relationship and condition factor of three species male fiddler crab from jaboy mangrove wetland, Sabang, Indonesia

Abstract

The size distribution, length-weight relationship and factor condition of three species male fiddler crab (Tubuca dussumieri, Gelasimus vocans and Austruca perplexa) from jaboy mangrove wetland, Sabang, Indonesia were examined. 50 samples from each species was collected from three station using digging method and cast net. Samplings were carried out during May 2019. The carapace length (CL) and total weight (TW) was measured using a digital caliper (standard error: 0.01 mm) and digital scale (standard error: 0.01 g). Result showed that Tubuca dussumieri, Gelasimus vocans and Austruca perplexa were found in the size range of 12.37-17.19 mm, 12.03-16.46 mm, 7.79-10.39 and mm carapace length, respectively. Besides, the total weight varied from 2.09-8.20 g, 2.85-5.07 g and 1.15-2.26 g, respectively. All species of male fiddler crab showed negative allometric growth (b < 3). The highest value of b was founded in Tubuca dussumieri, while the lowest was founded in Gelasimus vocans were 2.659 and 1.299, respectively. Nevertheless, Austruca perplexa has a higher value of factor condition than Tubuca dussumieri and Gelasimus vocans.