This is mainly because the developments are found within the demarcated road reserves which are meant for public utilities and road expansion.
It varies with the road category.
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.