In this video we see how marine fishes form shoals and schools. Fish form these aggregations primarily for defence from predators. First we see huge shoals and schools of cardinalfishes at dive sites in Thailand, including various locations around Phuket, Racha Yai, Racha Noi and the Similan Islands. Later we observe various species of fusiliers and snappers schooling in Burma's Mergui Archipelago.
We then encounter various species of barracuda forming impressive schools at Racha Yai, Black Rock and Koh Tachai. At Western Rocky Island we see an impressive school of sawtooth barracuda forming a huge vortex.
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