Why don’t warm air masses form over North Atlantic or Pacific oceans?

Air masses take on the characteristics of their source region. Air masses over large areas of similar temperature and moisture content. If the source area is moist the air mass will be moist. In the case of the North Atlantic and the North Pacific you have large areas of cold water, so cold and moist. This produces air masses that are also cold (cool) and moist.

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.