Fish do not have eyelids because the purpose of eyelids are to keep them moist so they don't dry up, and fish are already in water, so there is no purpose of eyelids for them.
Usually there is a heater that warms the tank on purpose.
most of the fish are used to a low lighting environment and the blue reflects well in the water so you can see the fish but the lighting isn't harsh on them nor does it heat up the water
1. It serves as a source of food/ fish 2. Tourist attraction 3 . For domestic purpose
What do clown fish eat?
The purpose of slime coating is to protect the fish against disease, infection and minor damage.
probably there is.
Some people try to use Duckweed for fish and livestock food, while more and more people are trying it out as a tool for waste water treatment. For the smaller water body owner, Duckweed usually takes over the entire surface of the water, suffocating their fish.
fish breathe through their gills. frogs breathe through their legs while in water.
fish die when taken out of the water because they have gills and fish absorb oxygen from the water and when the fish are taken out they die because of them .
Well it depends on the fish. If it is a fresh water fish then it lives in fresh water, salt water fish live in salt water.
Fish live in water.