Been thinking on this. I surmise that it is odd that so many as a large mob are drifting down a river deaf, and right side up. I speculate that all these birds died quite suddenly . I think it possible that this large mob were killed as the result of injesting poisoned bait laid in a dry land feeding area, then flying to river to roost where the poison took effect. The resulting pollution of the river with the carcasses is likely an illegal consequence of what could have been a deliberate and cruel action. I think some carcasses should be recovered if possible for analysis and the police involved.
Just my surmise.
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