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Yes, fish do need dark. They depend on the cycle of light and dark to determine spawning and migration times. During the longer days of summer and the shorter days of winter they spend time eating. As the days lengthen for spring, some fish like northern pike, muskellunge, and steelhead travel to spawning grounds. For other fish like brook trout and smallmouth bass the shortening days at the end of summer signal spawning time.
Another reason for dark is that even fish need rest. Food is easy to find while it's light out, so they are fairly active in the day. As dark falls, feeding activity slows. Of course, a full moon on a clear summer night, doesn't slow the walleyes down; ask any determined fisherman.
What else can I help you with?
Do planaria prefer light or dark environments?
Planaria prefer dark environments
Does my fish need light to survive or become healthier?
Most fish prefer to live in a well-lit tank. Lighting enhances the colours, and also allows live plants to grow, and fish prefer living in an environment with live plants. Fish constantly kept in the dark will probably be stressed and their eyesight may be affected.
Does the sea star prefer the light or the dark?
dark
Do mosquitoes prefer light or dark environments for feeding and breeding?
Mosquitoes prefer dark environments for feeding and breeding.
Do isopods prefer light or dark environments?
they like dark
Do fish prefer morning or night?
Some fish are nocturnal, some fish aren't, but some fish don't have a sense of day and night because they live so far down, it is always pitch black and dark.
Do crabs like dark areas?
To be honest crab prefer it dim,dark
Does a Blue Morpho Butterfly prefer light or dark places?
They would prefer light.
What is an homophone for ore?
"Do you prefer chicken or fish?"
Why are fish lazy in the dark?
because their are scare in dark
Do monster fish like the dark or light?
the dark
Does tarantulas prefer light or dark places?
They prefer darker places. Many tarantula species are found in densely forested areas, which are dark, humid places.
