Ornamental fishing farming is like maintaining an aquarium at a much larger scale on a commercial basis focussing on rearing and selling. A good plan that needs a lot of groundwork. First, you need real on ground data before you venture into this
1.Temperature and water quality at the place.
2.The intended place for fish farming and presence of a river, stream or running water that is not contaminated by industrial effluent.
3.The local demand for these ornamental fishes. For instance, Erode is a hot humid, place with a scarcity of water and it is listed as a textile town.So, please check the local market supply and demand mechanics.
4. Make a list of the potential retail aquarium and fish shops around a residential part of the city and visit them to learn more about average sales, popular breeds and sought after fishes.
5.You need to have a good sound understanding of these fishes (temperature, handling, feeding and reproduction patterns). For examples, guppies and goldfishes are hard fishes(survive better) in comparison to angel and clownfish are difficult to rear in harsh conditions.
6. West Bengal accounts for >75% of the ornamental fish trade. You also need to know what list of fishes are banned for trading. Last year a list of marine fishes were banned from rearing.
7.You need access to good quality fish food that would ensure regular breeding and good colors (agro product food, live worm food, prawn head food etc).
8. In the beginning, you can focus on breeding fish that produce live baby fishes (guppies, swordtail and platy). The, you can move on to goldfish and the popular tetras that are egg layers. The zebra and neon tetras are preferred by many people.
9.Please check the current guidelines in terms of licensing in your state as a few months back many stringent rules were laid down (https://www.telegraphindia.com/1170619/jsp/calcutta/story_157584.jsp).