Low sodium level. Low sodium level is a condition in which the amount of sodium (salt) in the blood is lower than normal. The medical name of this condition is hyponatremia. Causes. Sodium is found mostly in the body fluids outside the cells. It is very important for maintaining blood pressure.
In the summer later in the evening try casting dry flies where you see ripples or movement close to the water. Don't pull the line fast like you would for Rainbow Trout. Let the fly sit on the surface and every 5 to 10 seconds bring the fly a foot closer. Another trick is to use a wet fly with a regular fishing rod. About 4 feet from the end of the line you want a wood floater.
Insects are all over rivers and not on top of the rivers. Nearly all insects that trout eat originate from beneath the surface of the water. Nymphs and larvae can be found in nearly every river. Trout use these as their main source of food.