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What’s the best pellet size for fish,like catfish,rainbow trout ?

In aquaculture, most commonly found in pellet form.It is amongst the most important factors that can impact fish growth rates. Fish of different sizes should be fed pellets with different diameters.
Pellet size is clearly important from one key physiological perspective – the individual’s mouth. Give a fish a pellet larger than its gape, and not only may it have trouble eating that pellet, but it could even choke.
For example, rainbow trout essentially “chew” large pellets before swallowing them. During chewing, some feed is lost into the water, and with it precious nutrients that could otherwise be used for growth. But not the small the better,the issues with small pellets lie in the fact that they contain relatively lower levels of nutrients compared to larger ones. Give a fish too small-a-sized pellets, and it has to spend more time finding and consuming enough pellets to meet its energy requirements. It will cause low body growth.
As a general rule of thumb, pellet are generally considered optimal at sizes 25% – 50% of the fish’s mouth width.