Do fish run into each other in the dark?

Question

Can fish see in the dark? Do they hit the walls of aquariums? Do they bump into coral reefs?

Thank you :]

Answer 1

Generally no. You know those big schools of fish you see swimming around during the day, and they appear not to touch. Well those fish can do that at night as well.

Fish have a sensory process and related organ called the lateral line. It allows the to "see" in the dark or cloudy water.

Lateral Line Physiology and Anatomy
http://www.parmly.luc.edu/parmly/lat_line_phys_anat.html

Answer 2

Run Into Each Other

Answer 3

no, for several reasons. in the deepest, darkest parts of the ocean fish have a characteristic known as bioluminescence, which means they glow. other fish have organs that can feel the electrical output of other fish. sharks in particular have organs in their snout (called the ampulae of lorenzani if i remember correctly)
and then other fish (or sea faring mammals) use echo location... so you can turn off the hall way light, the fishies don't need it

Answer 4

I often end up asking the same question on other sites

Answer 5

No. Even it is in the darkest place, they would not bump into anything.

Answer 6

I don't think so. I think they must have some sort of sonar.