Requirement mandates CPR for fishThursday, April 4, 2002, By ANDREW KRAMER, Associated Press Writer ASTORIA, Ore. -- Ab Ihander isn't thrilled about throwing back the 20-pound spring chinook salmon he's just pulled into his boat with his tangle net. But the law says he must; it's a wild salmon, not hatchery-bred. Before he can return the salmon to the Columbia River, however, he revives it with a sort of CPR for fish. He lowers the salmon into a tank with pipes inside. A small Honda pump starts up, and oxygen-rich river water is circulated over the salmon's gills and mouth....