The latest survey of endangered southern resident killer whales confirms their plateau and gradual slide toward disappearance in the absence of stronger measures to protect them, a director with the Center for Whale Research says.

Michael Weiss says declining chinook salmon, pollutants and noise from cruise ships, tankers and freighters in the orcas' habitat off the coast of Washington state and southern British Columbia are among the factors driving the decline.

"We're not talking about southern residents going extinct in the next five years, but we are talking about a fairly good chance of at least one of the (three) pods being gone within the next 50 years," Weiss told The Canadian Press.

The long-term work of restoring chinook habitat, particularly freshwater spawning grounds, along

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