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When pre-school in Boxford in East Anglia, the local University at, I think Colchester, sent a grad' student once every little while to test the water as the river beside our house, which used to be a mill, was actually drinkable (4 microns, is it?), well anyway, when I was Four I specifically remember the excitement among the adults when Trout were seen swimming up river to the spring-pool behind our land. This on the East Coast. The Box empties into the Stour estuary and now the mouth of the Orwell and Stour have Harwich seaport on their south head and Felixstowe containerport on the north head, where used to be the wetlands and marshes, very similar to further north just south of Walberswick at Shingle Street. Mind you, I don't know if Shingle Street has also been filled, since I've not been there since early eighties. But I doubt very much if trout are found in the Box or the Stour.
Remembering the Trout in an East Coast river, I've thought that after the mid-west USA study, on oysters that picked on the East Coast of USA, we're transhipped to the mid-west where they closed, then began opening two weeks later as if still on the coast, because apparently they tune in to the Moon no matter the water. My idea was milking Trout/Salmon, and putting row and milk together in Moon-time in a spring-pool such as the Box, and breeding the fish out of cleansed or re-cleansed East Coast Rivers and any western rivers that they no longer breed in. If the fingerlings born in that water/soil make it to the sea, they should in their Moon-time return to that pool. I've heard biologists who have papers from book-learning say nay, but I've yet to hear from a practical trier, or one of those oyster research fellows. 😇

Scientists can hypothesize, but until a practical trier does some tests, they don'tnknow for sure!

Yay! That's what I reckon. That's what immediately came to mind when I read about the behaviour of the oysters. Where one might find clean enough rivers to experiment is a conundrum, but once proven to work, it becomes an enormous incentive to spend cleaning the rivers. 😇