Why must commercial crayfish pellets formulated for yabbies be sinking?

Answer

Because yabbies forage on the bottom

The necessity for commercial pellets to sink is directly linked to the yabby's primary feeding strategy. As organisms that function as bottom-dwellers, yabbies naturally forage along the substrate of their environment. If food floats, it will be inaccessible to them in their natural feeding posture. Therefore, sinking pellets ensure that the staple, balanced nutrition provided by commercial food effectively reaches the animal where it spends its time searching for sustenance.

Why must commercial crayfish pellets formulated for yabbies be sinking?
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