Sleeping Fish?

[Greg13]

How do fish sleep am i right in saying they have no eye lids? and do they just float around untill they wake up?
Greg 8)

 

[bobbicus]

hi

was under the impression that they have a "state" where they become less active - float in shallow water or rest on rocks/roots - thus conserving energy

although many aquatic animals have to keep moving in order to stay alive - eg, to push water through their mouths/gills in order to breathe

in humans the need for eyelids is to clean the conjunctiva and to lubricate it - as fish are in water - maybe they have not evolved this yet?? and with the constant danger of eat or be eaten perhaps there is no need for eyelids?

 

[Greg13]

yeah kinda wierd aint it!, yeah, and how about salmon when there swimming up the moutain? lol they float all the way back to the bottom nearly? that why it takes em so long
Greg 8)

 

[ajbettle]

ahh but fish like corys and danios (and lots more, just there the fish iv seen)...they do roll there eyes downwords into the sockets and back out again, maybe thats there way of blinking??? it loooks funny when they do it!

 

[Tokis-Phoenix]

ahh but fish like corys and danios (and lots more, just there the fish iv seen)...they do roll there eyes downwords into the sockets and back out again, maybe thats there way of blinking??? it loooks funny when they do it!

Yeah i've seen a lot of types of fish do than "blinking" thing, i've also seen all types of fish "yawn" as well- a lot of fish do seem to go into a sort of dormant state of swimming when they need rest, when i turn my tank lights off the livebearers generally hang around the water surface swimming around a little while some hang around in the plants, the neons/tetras and danios seem to huddle together around the plants almost motionless etc.
I'm not sure if the plecs have any strict rest time, they generally seem to be more active at night though, it seems they go hide in the caves and sit there for some hours not doing anything when they need rest.