A sign of good water quality?

Plum

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Seen on the River Crouch April 10. I counted 60 mullet in this shoal averaging 25cm. Anyone else seen an increase in mullet numbers this year?
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There always seem to be lots of grey mullet in marinas so I’ve assumed they are not too fussy about water quality.
They're often seen grazing near sewage outflows quite happily. Om nom nom, but that's why you will sometimes see the ones in fishmongers marked up 'bay mullet' to indicate they're from different waters. Certainly a question worth asking if you're buying them.
 
Don't be too sure about water quality.

Mullet can thrive where no other fish would even think about feeding - chances are if there's a big shoal of them all that actually means is everything else with fins and gills has already snuffed it.
 
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