What Feed Size to Give Your Catfishes？

1.5mm, 1.8mm, 2mm, 3mm, 4mm, 6mm, 8mm, 10mm, etc.
The bigger you fishes, the bigger the feed size they can pick.
Here’s what I recommend if you just stocked your ponds if your fishes fall into the following categories:
Fingerlings (3 to 4 grams): 1.5mm feed size
Post-fingerlings (4 – 6 grams): 1.8mm feed size
Juvenile (6 – 10 grams): 2mm feed size
Post-juvenile (10 – 50 grams): 2mm feed size

As your fishes grow, the size of feed they can pick will increase. Here’s the feed size I recommend for bigger fishes, based on their size/weight if you’re to give them floating feed:
10 – 50 grams: 2mm feed size
50 – 150 grams: 3mm feed size
150 – 400 grams: 4mm feed size

All things being equal, your fishes should be around 200 – 300 grams in 2 months with floating feed alone, if they are being fed properly; after then, you can switch to sinking feed and give them the following feed sizes:
200 – 300 grams: 2mm feed size
300 to 600 grams: 4mm feed size
600 grams to 1kg+: 6mm feed size

If your fishes exceed 1kg in weight, and you’re able to get bigger feed sizes, then you can consider giving them 8mm, or even later 10mm, feed sizes. 3 to 4kg fishes eat 6mm sinking feed just fine, though, so don’t worry too much if you can’t find bigger feed sizes.