Triggerfish
Depth: 40 m · Sunlight Zone
The triggerfish can lock its first dorsal spine upright like a bolt and wedge itself into a crevice so firmly that no enemy can pull it out. It is curious and feisty and even blows away sand to get at prey.
For scientists
The name comes from the locking mechanism: the first strong dorsal spine is held up by a second, smaller one like a trigger, so the fish can wedge itself into crevices. Triggerfish swim by undulating the second dorsal fin and the anal fin. Some species guard their egg clutch extremely aggressively.
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