Sunday, November 13, 2011

Cutting Salmon Catch Could Save Endangered Orcas


VICTORIA ( British Columbia ) — A large share of chinook salmon heading to the B.C.'s Fraser River each summer may have to be earmarked for endangered resident killer whales if the whale population is to recover, a new paper says.

"If the aim on both sides of the border is to not only stop the decline of killer whale populations, but also help increase their numbers, then we have to ensure the salmon they require are there when they need them," said lead author Rob Williams of the University of Washington and University of B.C.
That could mean adjusting fishing plans to include an allocation of chinook for the whales and underlines the need to increase chinook salmon runs, according to the paper, published this week in the online scientific journal PLoS ONE.

"Temporary reductions in fishing quotas may buy some time while salmon spawning habitat is improved to increase salmon returns," Williams wrote.

"An intriguing policy solution would be to give killer whales a salmon catch allocation under the (Pacific Salmon) Treaty. This would be consistent with the spirit of Canada's wild salmon policy, which places conservation needs ahead of fishery allocations."

The study estimates that 87 whales in the three resident pods consume between 12 and 23 per cent of the average 300,000 chinook that head for the Fraser River each summer. Each whale needs about 670 fish a day and 42 per cent more if it is a nursing female.

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