At first, scientists suggested banging pipes underwater to scare the whales toward the ocean, but that hasn’t seemed to move them. Now experts have come up with a second method that they’re confident will work.
Fresh water from the Sacramento River could hamper the whales’ recovery, biologists said. Skin samples taken from the mother whale on Monday were sent to out-of-state labs to assess her general health and help identify her population stock.
The challenge, officials said, was encouraging the pair to return to salt water quickly but without resorting to tactics that could upset the whales.