stiu ca pentru multi aceasta intrebare pare sa fie una stupida dar, as dori si eu sa aflu daca dorm si cum dorm pestii?
chiar daca este noapte si ma uit la acvariu cu toate luminile stinse tot mai vad miscari ale pestilor, cum dorm pestii?
multumesc

Un exemplu: colisa sta mai la suprafata apei, aproape imobili...SAE stau pe frunze mari de plante, nemiscati. Asta se intampla la mine

sigur ca dorm, de multe ori ii surprind pe ai mei stand nemiscati pe substrat noaptea iar daca le aprind lumina dureaza destul pana se trezesc si se misca cam ciudat la inceput, probabil cam ametiti ca oamenii treziti din somn :bla:

Ai mei se spala pe dinti de fiecare data inainte sa se duca la culcare .
Uite si raspunsul:
"
This is a complex question with no simple answer. Deciding if a fish is asleep depends on many factors, one of which is the definition of sleep.

In humans, the transition to sleep (or even closing the eyes) involves specified changes in the pattern of brain waves in the area of the brain called the neocortex. Fishes don't have the same degree of neocortical development as mammals and thus don't display these brain-wave patterns associated with sleep (view figure of a shark brain). So, as far as brain-wave patterns go, fishes don't sleep.

If, however, you define sleep as a combination of a reduced metabolic rate, slowed physical activity, lowered response to stimuli and the assumption of a resting posture, then many fishes do sleep. Perhaps the best-known 'sleepers' are the parrotfishes (family Scaridae). Many parrotfishes find a suitable spot on the seafloor and secrete a mucus envelope in which they spend the night.

Such fishes normally swim away from a diver by day, but can easily be approached and even gently handled at night. Many fishes, however, seem not to sleep. Pelagic (glossary) species such as tunas and some sharks never stop swimming. One theory suggests that during sleep, sensory information (predominantly visual) gathered during the day is processed to form memories. Fishes that swim constantly in blue oceanic waters receive little 'unusual' visual input and require less 'memory-processing time' and thus need no sleep. This is supported by studies on several species of blind fishes that live in caves. These sightless fishes do not sleep.

Having said all that, though, I did enjoy the simple answer of a young neighbour who told me with confidence that fish can't sleep because they don't have eyelids.

The text on this webpage is from McGrouther, M.A. 2003. Do Fishes Sleep? Nature Australia. Spring. 27(10):82.
"
sursa:
http://www.amonline.net.au/fishes/faq/sleep.htm

multumesc pentru raspunsuri,

aseara pe la 2 noaptea m-am uitat in acvariu si am surprins pestii plutiind nemiscati cam la 5 centimetri deasupra substratului.probabil ca dormeau...

Uitate bine si vezi daca sigur dormeau sau se odihneau.Vezi si tu aveau ochii inchisi sau nu.

Ar fi interesant de stiut ce fac noaptea pestii cunoscuti ca avand activitate nocturna. Bineanteles ma refer la faptul ca e posibil ca activitatea nocturna sa nu fie non-stop si sa aiba si ei perioade de somn nocturn sau nu, pur si simplu "fac treaba" toata noaptea si "dorm" numai ziua.

INTROS wrote: "fac treaba" toata noaptea si "dorm" numai ziua.

..discoteci , gagici, whiskyane...nu ti-e clar? Nu i-ai vazut dimineata can` le aprinzi lumina ce fetze au...decolorati rau. Aia mai recalcitranti mai trag cate o injuratura

INTROS wrote: "fac treaba" toata noaptea si "dorm" numai ziua.

la cata lumina ai tu, merge si un moonlight! efectul e garantat, mai ales daca ai valuri la suprafata apei si lumina ajunge pe obiectele din acvariu "tremurata". Sunt zile intregi cand imi privesc pestii si crevetii exclusiv la "lumina lunii", adica noaptea cand ajung si eu pe acasa...

lukaboy wrote:
la cata lumina ai tu, merge si un moonlight!

Mda... e o idee, incep sa ma gandesc.