I read in the Times yesterday that almost all rainbows and about half of brown trout stocked in our waters are triploid( an extra X chromosome channels sexual energy into growth) or all female (female fish fed with testosterone which makes them pseudo male).
When did this first start ? Is it harming our waters ? Is this partly the reason why rainbows don't spawn in the UK, apart from a few exceptions?
When did this first start ? Is it harming our waters ? Is this partly the reason why rainbows don't spawn in the UK, apart from a few exceptions?