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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