2007-02-18 09:48:00 · 9 answers · asked by ♥me♥ 3 in Pets ➔ Fish
They dont really sleep but they do just float aroudn at night when we go to sleep. I watched one night! (super bored)
2007-02-18 09:55:37 · answer #1 · answered by Courtney 5 · 1⤊ 1⤋
Sleep means different things to different forms of animal life, however, sleep is defined as "a period of rest during which volition and consciousness are in partial or complete abeyance and the bodily functions partially suspended; a behavioral state marked by characteristic immobile posture and diminished, but readily reversible sensitivity to external stimuli." Most animals have some daily pattern of rest and activity and, in many species, these daily cycles are similar to people running around during the day then lying down at night and doing nothing or sleeping. It is believed that fish are no different, although it is a controversial subject. Some fish keep very still, experiencing a quiet period (quiescence) that you might call sleep. Scuba divers often handle reef fish in the middle of the night without startling them and can even lift some species out of the water before they "awaken." Tropical freshwater fish in home aquaria appear to be resting immediately after turning the lights on in a room that has been darkened for several hours. So, if you define "sleep" in this term, diurnal fish (fish who are active during the day) sleep at night and nocturnal fish (fish who are active at night) sleep during the day. Unfortunately, fish have no eyelids, so absent this obviously slowed movement or reaction time, it is difficult to tell whether they are asleep or not.
2007-02-18 18:16:26 · answer #2 · answered by Venice Girl 6 · 0⤊ 0⤋
Out of all the species of fish in the world, only 4 species sleep. All of the other species don't sleep at all. It sounds abnormal but it's true.
Have a nice day.
2007-02-18 17:51:24 · answer #3 · answered by Anonymous · 2⤊ 2⤋
They don't really sleep(expect parrot fish and a few others) but rest instead,usually when its dark.
2007-02-18 18:00:49 · answer #4 · answered by 0000000000000000 2 · 0⤊ 0⤋
At night or when it is quiet, usually. Their respiration rate drops, and they become very still, usually floating close to the bottom of the tank in aquaria.
They are very easy to startle in this state, so loud noises and sudden movement close to the tank can cause them to leap out.
2007-02-18 17:59:33 · answer #5 · answered by P. M 5 · 2⤊ 0⤋
When it's dark.
In nature, they sleep at night.
In captivity, you should turn off the aquarium light at night to allow them their natural sleep cycle.
2007-02-18 17:51:02 · answer #6 · answered by flywho 5 · 3⤊ 0⤋
I believe only Beta fish sleep.
2007-02-18 17:56:05 · answer #7 · answered by Anonymous · 0⤊ 4⤋
Never
2007-02-18 17:50:13 · answer #8 · answered by -tima 3 · 0⤊ 3⤋
When you are not watching.
2007-02-18 17:54:24 · answer #9 · answered by PeeTee 7 · 0⤊ 1⤋