Measurement and Analysis of Target Strength of Tiger Grouper Fish (Epinephelus fuscoguttatus) Using Acoustic Methods in Lancang Island Seawater

Coral fish are organisms with the largest amount of biomass and also large that can be found in coral reef ecosystems. The tendency is they do not move around always a certain area very relocated although still many (Nybakken, 1988). often on island Lancang Tiger Grouper (Epinepheus fuscoguttatus). have high economic value if fishermen good cultivation this island. method used was mobile controlled hydroacoustics, located Pulu Thousand Islands. instruments SIMRAD EK 15. number samples measured as 3 heads total length ranging from 21,70 cm to 42,50 has weight three 186,9 gr 640 recording time 5 minutes done at Dock Floating Net Cage. sounding results tiger grouper were then analyzed using Echoview 4.0 microsoft excel. analysis showed average TS groupers whose ranged -34,77 dB -32,37 longer fish, greater value.