Those kind of ventures are very well paying ventures. I have interests in these businesses. I have bought a 3000 liters pond but the price of fish feeds keep scaring me away. I am just waiting to build financial muscle before I start.
It is actually a kind of business that you grow gradually so that the cost of running the business is not going to become too much for you to beat. It is why people are always advised to start in a small way and grow the business.