FISH raised in hatcheries need to go on training courses to help them cope
with life in the wild. This tactic could make a big difference to the survival
rates for the fish, which often succumb to predators they don’t recognise.
Many countries—in particular the US, Norway and Japan—breed fish
and release them into the rivers and oceans to boost stocks for anglers and
trawlers, or help re-establish endangered species. But there’s a problem: many
of the fish don’t make it.
Studies suggest that around 5 billion hatchery-reared salmon are released
worldwide each year, but less than 5…
