marine fish lay eggs in fresh water river
An egg that sinks in water is fresh, while an egg that floats is not fresh.
Fresh eggs float in salt water because the density of salt water is more than the density of the egg. But fresh eggs do not float in fresh water because the density of water is less than that of the egg. Salt increases the density of water.
An egg sinks in fresh water because its density is higher than that of water. The weight of the egg overcomes the buoyant force exerted by the water, causing it to sink.
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The babies will probably die in the egg and never hatch. If the egg hatches, the baby fish will be born dead or die on impact with what would be "alien" water to them.
Salt water is denser than fresh.
salt water
It depends on the age of the egg. An older egg is likely to float as the air bubble in the egg hows larger as the egg dries out. This used to be a test for separating fresh from old eggs in general stores. Even a fresh egg (even though it doesn't float) will orient itself bubble end up in a pan of water.
salt water!:)
salt water.
salty
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