I am familiar with maintaining feeding fish at a percentage of its body weight through out its rearing period, for instance feeding Catfish at 5% BW for the 5 months it takes to achieve market weight and of course adjusting every forthnight to fit the new BW. But what i find strange is feeding for 5% for the first 2 months and then at 3% for another two months and then maybe 2% for the last month. If someone can explain the science behind this or perhaps its just a production practice adopted to optimize feeding.
https://www.sciencedirect.com/science/article/abs/pii/004484869290410M
https://books.google.iq/books?id=BUS6CAAAQBAJ&pg=PA463&lpg=PA463&dq=feeding+fish+at+a+percentage+of+its+body+weight&source=bl&ots=RtyI3s8d8u&sig=iK5O0EOsO8QCebyxBgE-sV7_0dw&hl=ar&sa=X&ved=2ahUKEwi9vOeygOnfAhViqnEKHTmXCNwQ6AEwDXoECAIQAQ
Cost of feeding fish is quite higher and excess feed produce a lot of ammonia which is toxic to fish. As growth rate decrease with age so better reduce the feed.hence reduction in the cost
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