Muddy, Impure
If a tsunami gets into a net that's imprisoning a bunch of insects, the insects are going to get all muddy. The net gets dragged along with the tsunami water and the insects can't escape, so they just get covered in the yucky stuff.
Picture a net prison full of insects being dragged by a tsunami getting muddier and muddier. Poor buggles!
だく, じょく
にご
None
Unfortunately for the insects, these muddy conditions have created the perfect habitat for ducks (だく). And muddy insects already imprisoned in a muddy net is a duck's favorite treat!
Picture a bunch of muddy ducks munching on some muddy trapped insects, in some muddy leftover tsunami water.