Sergeant Major Fish. Hydrophone recording. Churrs (produced by vibrating swim bladder) 0m13s, 0m50s, 2m08s & 2m37s. Scraping sounds (from grinding teeth) 0m38s, 0m48s & 1m47s. Also many clicks from shrimp. N.B. Exact date of this recording is unknown. Distant engine noise. Bunaken National Marine Park, Sulawesi