Comparison of fish assemblages aggregated by artificial reefs using scuba diving and acoustic surveys

To determine the aggregation effect of artificial reefs (ARs), we conducted surveys in 16 Taiwan by using scientific echo sounder, Simrad EY-60 (200 KHz), along with sighting scuba divers. Scuba diving was within reef structures (r ¼ 20 m), whereas acoustic were over a wider range 100 five repeating transects ARs. We compared results obtained from two methods among coastal waters to consistency quantitative information between and investigate fish assemblage status The summers 2018 2019. In most cases, descriptors (e.g., TS, Sv, NASC) lengths total number fish) had variation. mean length estimated TS showed synchronous change. ARs larger sighted eye detected acoustics, higher diversity aggregated varia-tion values. NASC es-timated acoustics are not as good that TS. A possible reason is surveying ranges much than those partly because echoes too close dead zone beam.