Question 1

True or false: Barreleye fish are commonly found in shallow coastal waters near coral reefs.

Accepted Answer

False. They live at depths of 600 to 800 meters in the deep ocean, rarely seen near the surface.

Question 2

True or false: Barreleye fish use bioluminescent lures to attract prey in the dark ocean depths.

Accepted Answer

False. They lack a lure; instead, they rely on their upward-facing eyes to spot silhouettes of prey against dim light from above.

Question 3

True or false: Barreleye fish have been observed stealing food from jellyfish-like creatures called siphonophores.

Accepted Answer

True. They slip inside the tentacles of siphonophores to grab prey, using their clear shield to avoid stings.

Question 4

True or false: Their green, barrel-shaped eyes give them a 360-degree field of vision underwater.

Accepted Answer

False. Eyes are tubular and point upward, offering only a narrow, upward view—not 360 degrees.

Question 5

True or false: Barreleye fish can rotate their eyes to look upward through their transparent head.

Accepted Answer

True. Their tubular eyes swivel inside a fluid-filled, clear dome to spot prey above, a unique adaptation in deep-sea fish.

Question 6

True or false: Barreleye fish can spit water to knock prey out of floating debris.

Accepted Answer

False. No evidence supports this; they are slow swimmers that primarily ambush small drifting animals.

Question 7

True or false: The barreleye's transparent head is actually a shield of clear, fluid-filled tissue protecting its eyes.

Accepted Answer

True. This dome, called a 'visual shield,' protects sensitive eyes from stinging cells of siphonophores they steal food from.

Question 8

True or false: Scientists first described the barreleye fish in 1939 from a specimen caught off California.

Accepted Answer

True. Discovered as Macropinna microstoma, it was known only from damaged specimens until ROV footage in the 2000s.

Barreleye Fish Trivia Questions