What is the unstoppable electrical current that travels down the length of the entire surface of a sarcolemma?

It is called action potential.

Explanation:

Action potential is the change in electrical potential associated with the passage of an impulse along the membrane of a muscle cell or nerve cell.

h

explanation:

answer: 20 percent

the fish culture has become a developing commercial practice in developing countries which is already prominent in developed countries of the world. the major fish protein demand is being supplemented in developing countries is   fishing to meet the needs of the growing population. therefore, in some developing nations, the percentage of animal protein from fish in the diet can be as high as 20 percent.