Spavaju. Neke se zavuku u mulj, neke plivaju i kada spavaju, neke plutaju...

Question: Is it true that fish do not sleep?
Tom M Dechand

Answer: Most all fish spend time in an energy-saving state that can be called
"rest", and we might even call their behavior "sleep", though it is probably
different than "sleep" in most land
animals. Many fish, like Bass and perch, rest on or under logs at
night. Coral reef fish active in the day, hide and rest in crevices
and cracks in the reef to avoid being eaten at night.
The resting behavior of fish is very different from their behavior the
rest of the day. Many minnows, for example, which are very active in
schools during the day, scatter and remain motionless in shallow
water at night. Many fish "rest" or "sleep" during the day and are
active at night instead, but almost all fish sleep.
There are some animals that never stop swimming, like many species of
shark, however, they HAVE to keep moving to push water through their mouths
in order to breathe, and they may still sleep while moving,
we just don't know yet.

http://www.newton.dep.anl.gov/askasci/bio99/bio99047.htm

http://www.petplace.com/fish/do-fish-sleep/page1.aspx

Jedne noći idem ja do kuhinje da se naločem vode (dehidrirao od alkohola ), palim svetlo u kuhinji i bacim pogled na akvarijum, kad ono sve ribe leže na dnu. Eto ti odgovora.

p.s. Ujutru su, ipak, plivale (ne na leđima)

Aha.. I moje se zavuku negde i kao kuntaju

imam nekoliko drugara koji odlaze na nocno pecanje tako da zakljucujem da ribe ne spavaju.

Oni pecaju ribe "koje vole da izlaze nocu"

A da li ribe spavaju nocu ili nezavisno od doba dana ?

Koliko sam ja video kod mojih nema pravila...

Takodje...>> slicna situacija.. Ja ne paliim svetlo kada udjem uvece u sobu>>>> (da li ih ne probudim slucajno...:)

Ne , one neznaju sta je san !!!