France on Saturday banned the breeding in captivity of dolphins and killer whales under tighter rules that campaigners hope will eventually herald the end of shows involving the animals.

Environment Minister Segolene Royal had on Wednesday signed a version of the legislation introducing "tight controls on the reproduction of dolphins", her ministry said in a statement.

But she has since decided the rules need to be "more radical", her ministry told AFP on Saturday, particularly after learning that "some animals were drugged" in aquariums.

The new rules ban the captivity of all whales, dolphins and porpoises, except for orcas and bottlenose dolphins already held in authorised aquariums.