To understand what is really needed for proper aeration, think about your own oxygen needs If you were in a large airtight room you would be able to breathe for several hours before using up
all the oxygen. If you were in an airtight closet, the oxygen would be used up a lot quicker. If you put a bag over your head the oxygen in our lungs
would be used very quickly. Without adding oxygen you would suffocate. In any case you could breath indefinitely, if you had a source of outside air
Same principle with fish:
Size And Amount Of Air Bubbles
Whenever air bubbles are in contact with water, through natural or artificial means, a transfer of oxygen from the air bubbles to
the water takes place until the water becomes saturated. Watch the air bubbles produced by your aerator. If they large and quickly rise to the
surface they provide little aeration or oxygen transfer.
The warmer the water, the less oxygen it will hold.
The proper dissolved oxygen content must be present for fish to survive it is more important than water temperature. Use a thermometer to keep track of water temperature. Never change water temperatures over ten degrees when exchanging shad into different tanks, 5 degrees is preferred
Oxygen in Water
Oxygen in water is known as dissolved oxygen or DO. Oxygen is constantly entering and leaving water, but there is a certain amount of oxygen in water at all times. This is because water has a natural attraction to oxygen. When oxygen comes in contact with the surface of water, the oxygen enters the water, becoming dissolved oxygen.
The amount of attraction between oxygen and water depends on the amount of oxygen already in the water. If there is very little oxygen in water, then the water is very attractive to oxygen.
A fish's metabolism also helps determine the amount of oxygen which a fish needs to survive. Fish with a high metabolism are fast moving but also require a great deal of oxygen to survive. Fish with a slow metabolism are more sluggish and require less oxygen.
Carp and trout are examples of the two extremes of fish oxygen requirements. Trout have a small gill area and a high metabolism, so they like moving, cooler waters where the oxygen
levels are high. Carp, in contrast, have a small gill area and a slower metabolism, so they can withstand low levels of oxygen and
live in small lakes and ponds.
You can think of an oxygen molecule as a person who likes to live far away from other people. If this person is looking for a place to live, they will move into the area with the
lowest population. Oxygen molecules do the same thing. If the air is crowded with oxygen but the water is not, the oxygen
will move into the water. If the water is crowded with oxygen but the air is not, then the oxygen will move into the air. The
greater the difference between the oxygen concentration in the air and the dissolved oxygen concentration in the water, the faster the
oxygen will move into the water.
Keeping Shad Alive