The O'opu Hi'ukole (Lentipes concolor) is one of the four goby fish that is endemic to Hawaii. It cannot be found anywhere accept Hawaii. It eats on plants and animal matter. The males have black heads and orange tails. They are best known for their climbing ability. All of the Hawaiian gobies are unique because of its life cycle.

This fish's habitant is usually upper stream reaches. This fish has a few Hawaiian names depending on the island. They are known as an alamo'o on the big island. Mo'o means "lizard-like" referring to it's head. They are also known as the h'opu hi'u 'ula which translates to "raw tail" and "red tail."

This photo shows how the male and female look very different while they are breeding. Scientists thought at first that they were distinct species.