A fish’s nighttime sac

A parrotfish enclosed within a translucent mucus cocoon resting on the seabed.

Parrotfish night sac

A queen parrotfish reportedly forms a roomy mucus sac for nighttime rest. Swipe to see when it forms and what the account says.

A parrotfish resting inside a dark coral crevice.

Parrotfish night sac

Come sundown, the queen parrotfish slips into a reef crevice and secretes mucus; in about 30 minutes, it rests inside the sac.

Close-up of a parrotfish inside a clear mucus cocoon covered in fine sand particles.

Parrotfish night sac

The account describes a resting sac; it neither calls it a defensive slime cloud nor compares mechanisms. That reported adaptation hints at how specialized reef life can be.

A fish’s nighttime sac

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