Why is the market of cat fish not easy to get yet the farmers are able to easily raise cat fish to sizable weight

You should not grow cat fish for the sake of attaching big sizes and weight but rather in respect of what the market wants. Consumers will be reluctant to buy a fish of 4kgs when his family is of three/ four people. As well farmers must learn to engage into value addition (fish smoking) but only small fish size is able to be smoked.