Prevalence and abundance of Vorticella sp. on mangrove crab (Scylla serrata) landed at Sleko Fish Auction Place, Cilacap District, Central Java

Abstract

Abstract. Khotimah A, Rokhmani, Edy Riwidiharso. 2018. Prevalence and abundance of Vorticella sp. on mangrove crab (Scylla serrata) landed at Sleko Fish Auction Place, Cilacap District, Central Java. Pros Sem Nas Masy Biodiv Indon 4: 87-91. Vorticella sp. are ectoparasites that attack aquatic organisms, such as fish, shrimp, and crabs. Vorticella sp. causing decreased appetite, movement disorders, larval molting process, stress and even death on the host. Deaths from Vorticella sp. can cause the decline of mangrove crab population in water. One of the potential marine waters in Indonesia is Cilacap waters area. Cilacap waters area there are mangrove ecosystems Segara Anakan which is a shelter and source of feed for aquatic organisms, including mangrove crabs. Mud crab (Scylla serrata) has high economic value, both in domestic market and international market. Mangrove crab is one of fishery commodities that live in coastal waters, especially in mangrove forests (mangroves). This study aims to determine the prevalence of crabs infected with Vorticella sp. as well as the abundance of Vorticella sp. on mangrove crabs, landed on the Sleko Fish Auction Place (TPI). The research method used is a survey method with purposive sampling technique. Samples were taken as much as 10% of the number of mangrove crabs that are landing on the TPI Sleko.Results of research conducted on carapace, gill, foot, foot, and claws. The prevalence of mangrove crabs is categorized frequently, while the abundance of Vorticella sp. including in very rare categories.