I am an avid snorkeler. When I first came to Hawaii in 1982, you could approach a reef from any of Maui's shores and see bright yellow fish moving about. Yellow tangs, of course, and, along with a myriad other beautiful and often unique reef fish, they graced almost every good snorkeling spot on Maui. Not anymore. Many reef fish species seem depleted and are seen in much lower numbers or almost not at all.