Posts tagged ‘water’

Do fish drink the water they live in?

Fish

Fish consume the water they inhabit if it agrees with their system.  Since the bodies of freshwater fish are much saltier than the water they live in, they don’t drink.

They are in danger of too much water entering their bodies, diluting their body fluids. They urinate often to get rid of any extra water that soaks into their bodies.

Saltwater fish, however, drink large amounts of water, since the salty sea water absorbs moisture from their bodies, causing dehydration.  These fish eliminate excess salt through their gills and very concentrated urine.–Dick Rogers

Can fish drown?

Fish can drown under certain conditions.  It is not the water that keeps fish alive, but the oxygen in the water.  Fish breathe oxygen, just as we do.  The water contains oxygen that comes from the air or is given off by water plants.

A fish takes the oxygen out of the water by means of its gills.  When a fish is placed in a small tank of water, however, it may soon use up all the oxygen that is in the water.

If this happens, the fish suffocates.  This is why, if you keep pet fish, you must change the water frequently in order to give them a fresh supply of oxygen.–Dick Rogers

Do fish sleep?

Fish

Yes, fish sleep.  Because fish have no eyelids, they cannot close their eyes—and it may look as though they never sleep.  Many fish sleep by simply remaining very still in the water.

Others lie on the bottom, resting upright or on their sides.  And a few others wriggle into the sand on the floor of the body of water in which they live.

In this way, fish rest their bodies as you and I do when we sleep.  If you happen to see a fish lying almost motionless in the water, it is probably asleep.  Fish don’t sleep as soundly as humans do, and the slightest disturbance will wake them.–Dick Rogers

What is a called blooded animal?

Cold Blooded Animal

Many animals such as fish, frogs, snakes and lizards are often called “cold-blooded,” as opposed to “warm-blooded” mammals and birds.

This does not mean their blood is always cold. Unlike warm-blooded animals, they do not have built-in temperature controls that keep their bodies evenly warmed.

Instead, their body temperature is usually near that of the surrounding air or water air or water.  The cold-blooded animal is hot in hot weather, and cold in cold weather.

Many depend on the sun for their body heat. Lizards, for example bask in the sun to warm their bodies.–Dick Rogers

Why does a camel have a hump?

Camel

The camel’s best known feature is the hump on its back.  The camel’s hump is mostly fat that provides nourishment when food is hard to find.  When a camel goes a long time without food, its hump shrinks.  After it has eaten and rested, its hump becomes plump and firm again.

People once believed that a camel stores water in its hump.  Now we know that a camel simply conserves its body moisture, rather storing an extra water supply.  It can travel for days without food or water because of its fatty hump and its efficient water conservation. – Dick Rogers