Hawaiian Squirrelfish, the Island s most abundant squirrelfish, is nocturnal. It spends daylight in caves and emerges at night to forage among coral reefs for prey.
Most fish see in color.
These bottom dwellers do not respond to color differences when tested in shallow waters. Red is a common color in fish, says the National Aquarium in Baltimore. Perhaps that s the color they prefer. If so, they have for a long time. Seeing in color has helped animals survive through the ages.