2006-09-13 17:37:39 · 15 answers · asked by norin f 1 in Education & Reference ➔ Higher Education (University +)
They sleep on waterbeds
2006-09-13 17:39:21 · answer #1 · answered by ? 2 · 2⤊ 1⤋
Most fish spend part of every day asleep. Being asleep can mean different things to different fish. Some fish (like herring and tuna) are motionless in the water during the night. Other fish, like rockfish and grouper, don't appear to sleep at all. They rest against rocks, bracing themselves with their fins. Also, some freshwater fish (like catfish) swim up under a log or river bank for shelter during the day. By the way, fish can't close their eyes when they sleep; they don't have eyelids.
2006-09-13 17:46:52 · answer #2 · answered by Nathalie 2 · 0⤊ 0⤋
http://www.newton.dep.anl.gov/askasci/bio99/bio99047.htmTom 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.
2006-09-13 17:42:50 · answer #3 · answered by Joe Cool 6 · 0⤊ 0⤋
I dont believe that fish or any marine animals acutally 'sleep'. I think, now dont quote me, haha..but I think I remember reading someting that fish just let themselves sink and they swim very very slowly to rest. Almost like they go into a state, but not sleeping. I think the same is true for sharks, too.
2006-09-13 17:40:13 · answer #4 · answered by Mizzy 3 · 0⤊ 0⤋
Either clustered in schools (for safety) or sheltered by underwater reefs. Usually they close a nictating membrane over their eye. The membrane is transparent so they can still watch for predators, and they doze for various periods of time.
Lucky mama fish. Daddy fishes don't snore!
2006-09-13 17:44:37 · answer #5 · answered by old lady 7 · 0⤊ 0⤋
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.
2006-09-13 17:41:21 · answer #6 · answered by David P 3 · 0⤊ 0⤋
Depends on the fish. Sharks have to be in currents or else they will die...others lie at the bottom of beds to sleep...just because the fish you see in your tank don't have eyelids, mean they don't sleep. Keep in in mind when you blink you are moistening your eyes...fish are underwater...so why blink? : )
Hope this helps
2006-09-13 17:42:44 · answer #7 · answered by Chistiaŋ 7 · 0⤊ 1⤋
Some don't sleep, sharks don't, it depends on their oxygen needs. If they need to keep fresh water flowing agains their gills they don't sleep. Some fish can just sit there because they don't need that much air.
2006-09-13 17:39:45 · answer #8 · answered by thetyranyofevilmen 2 · 1⤊ 0⤋
Sometimes they just park themselves somewhere, like in a small cave or corner of the aquarium. They have no eyelids though.
2006-09-13 17:41:10 · answer #9 · answered by ihaftaknow 3 · 0⤊ 0⤋
I really don`t think they sleep. I would have to ask a marine biologist and let you know...
2006-09-13 17:41:32 · answer #10 · answered by Carol H 5 · 0⤊ 0⤋