Segara Anakan is an estuarine ecosystem located on the southern coast of Central Java Province which is very fertile with high biodiversity. However, the current condition is thought to have experienced a decline in biodiversity caused by sedimentation, overexploitation and water pollution problems so that it is feared that it will disrupt the preservation of organisms including fish. The purpose of this study was to determine the diversity of fish found in Segara Anakan Cilacap, and to know the conservation status of each species of fish caught in Segara Anakan in eastern Cilacap. This research was conducted using a survey method with cluster random sampling technique at 6 stations (3 stations on the Sapuregel River and 3 stations on the Kembangkuning River) with 3 replications each during highest tide. Fish collection is done by using a net and gillnet or gillnet that is installed during low tide and carried out during high tide. The diversity of fish in the waters of Segara Anakan is 36 species from 25 families. There are 16 species from 15 families in the Donan River and 34 species from 25 families in the Sapuregel River. The diversity of fish in the Sapuregel River is higher than in the Donan River. The status of fish in the eastern Segara Anakan waters management area is mostly in the LR (Least Concern) or low risk status and 1 NT (Near Threatened) species or threatened with extinction namely Sidat Fish (Anguilla bicolof)
River Sapuregel empties into the eastern region of Segara Anakan Cilacap. It is one of the major rivers surrounded by mangrove forests and has a variety of biological resources, including fish. The research aimed to study the fish diversity and composition Sapuregel river mouth of Segara Anakan Eastern Area Cilacap. Research on fish diversity was carried out from April to September 2018. The method was purposive random sampling at the Sapuregel estuary. The results showed that 1.446 individuals representing 23 families and 34 species were dominated by Engraulidae families in the rainy season (42.57%) and dry season (57.41%) followed by Gobidae (16.82%) in the rainy season and Mugilidae (19, 44%) in the dry season. Small fish within the range of 2.7–22.9 cm dominated the caught fish. Fish Diversity Index ranges from 1.71 to 1.843 in the rainy and dry seasons between 1.352-1.56. These results indicated that fish diversity in the rainy season was higher than the dry season. Evenness Index ranges from 0.1907 to 0.2178 in the rainy season, between 0.2274 and 0.28 in the dry season, the species similarity in the dry season was higher than the rainy season. The size of the fish obtained varied from juvenile to adult size. It was dominated by small fish so that it was suspected that the waters of the River Sapuregel were used as spawning grounds and enlargement of several types of fish.
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