CLEAN:Curious whales give boost to Mexican fishermen

Ignacio Lagoon serves as a crucial nursery for Pacific Gray whales, where mothers bring their calves to avoid predators. Fisherman Pachico Mayoral, who once feared whales, now leads whale-watching tours, having first encountered them 40 years ago. The lagoon has become a tourist attraction, with several companies offering tours. Scientists and environmentalists ensure that tourism does not disrupt whale behavior. While some locals benefit economically, others feel left out of ecotourism's advantages.

How do scientists ensure that whale watching does not disturb the natural behavior of the whales?

What concerns do some locals have regarding ecotourism?