Inventory of ectoparasite helminth on the Hybrid Grouper (Epinephelus fuscoguttatus x Epinephelus lanceolatus) from traditional ponds in the Kampung Kerapu Lamongan East Java Indonesia

The purpose of this study was to determine ectoparasite helminth species, predilection, prevalence and intensity of attacks on Hybrid Grouper "Cantang" (Epinephelus fuscoguttatus x Epinephelus lanceolatus) from traditional ponds in Kampung Kerapu, Lamongan. This research is a survey with descriptive method. Hybrid Grouper "Cantang" samples were taken as many as 45 fish. Observations were made at the Anatomy and Fish Culture Laboratory, and Microbiology Laboratory of the Faculty of Fisheries and Marine Airlangga University, Surabaya. The result of this study, 25 of 45 Grouper were known to be infested. The ectoparasite helminth which infest the Groupers is Zeylanicobdella arugamensis which is a group of marine leech with a prevalence of 55.56 % so that it belongs to the very often category and the intensity of 11.32 ind/fish is classified in the moderate category. The distribution of Zeylanicobdella arugamensis predilection which infested Groupers was found most on the fins, 162 individual or 57.24 %.