The woman who said this has been an environmental and feminist campaigner for decades.
She's probably right, and hormonal contraceptives can be added to the list too. I have no doubt she has also had things to say about plastics producing oestrogen-like substances as they break down and the effects of these in our water supply, rivers and oceans.
We've known about this for decades, it's hardly a new thing.
It doesn't seem to make much difference to the fish whether a hormone is artificial or bio-identical (or a by-product of the breakdown of some plastics). If an artificially delivered hormone is not all absorbed you will piss it out and it will end up in the water, poisoning fish.
Elizabeth's point was that the huge increase in male trans people taking oestrogen simply adds to an already existing problem.
I wonder if any research has been done on the effects of puberty blockers on fish health.
Transactivists really need to learn it's not all about them.