Salmon numbers leap to reverse two decades of decline in UK rivers

[xchrom]

http://www.guardian.co.uk/environment/2011/jun/26/salmon-numbers-leap

Against all expectations, salmon numbers are leaping again in British rivers. Conservation scientists have discovered that the fish is staging a comeback in many native streams and waterways.

The return of the salmon is good news for fly fishermen – and for conservationists who have worked hard to restore numbers after the fish's disastrous decline two decades ago.

However, experts warn that the current increase – revealed in statistics for salmon tagged and counted in 2010 and from observations from river banks this year – may only be temporary.

"We still don't know why this is happening. It may just be a one-off or it could be a general trend to a return to healthy salmon numbers in our rivers," said Dr Anton Ibbotson, of the Game and Wildlife Conservation Trust.

[HysteryDiagnosis]

1. People pee ends up in rivers. People take birth control. Birth control affects whether

or not true male fish develop in rivers, could be a connection. People might not be using so much oral contraception as other devices of late, don't know, don't have the stats.