When a nerve cell is at rest, potassium is concentrated the nerve cell and sodium is concentrated the nerve cell.?

Potassium ion is concentrated inside the nerve cell and sodium ion is concentrated outside the nerve cell.

In some developing nations the percentage of the animal protein from fish in the diet can be as high as 25 percent.  about 85% of fish caught is used for human consumption.  the remainder is converted into fishmeal and fish oil.