We feel that the effect of our work in terms of raising awareness of the dolphins is much more important than any monetary contribution we could make to the various charitable organizations currently soliciting money on behalf of the dolphins. As we don't do systematic survey work, any answer to this question would have little scientific value. We probably see more dolphins than when we first started, because we're more experienced, we go more frequently, and the dolphins are more accustomed to our boats. We're definitely getting better sightings, when the dolphins come very close to the boat, more frequently. The best theory we've heard is that they're actually white, but they look pink because they're blushing.
All cetaceans are warm-blooded, meaning they regulate their own body temperatures.
When they create excess heat from exercise, such as chasing fish, they flush blood to the outer layers of their skin, to get the heat from their body core out beyond the insulating layer of blubber, so that the heat can disperse to the water. Adding another diesel-powered boat to the existing traffic certainly doesn't do the dolphins any good. In fact, in some areas, dolphins and whales are threatened by tour operators acting irresponsibly. Boat traffic, in turn, is only one of the threats facing the dolphins, and probably not the most serious one. Hong Kong Dolphinwatch Ltd. follows a code of conduct designed to minimize the disturbance to the dolphins.