How did Rudolf Virchow contribute to the cell theory? I know that he added the third tenet "Omnis cellula e cellula", which means that all cells come from [pre-existing] cells, but HOW did he come to this conclusion?

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.