On the way back from a field trip to one of Alabama’s barrier islands in the late 1970s, W. Mike Howell and the students in his vertebrate biology class detoured over the state line into Florida to collect some fish.
Samples of water collected downstream of a pulp mill (left) and from a neighboring unpolluted creek (right). JenkinsThe mosquitofish at top is a normal, pregnant female from Spring Creek. In the middle are three Fenholloway River females in various stages of masculinization. Their anal fins are longer than normal and resemble the narrow gonopodium on the Spring Creek male (small fish heading toward bottom).
Log in
Subscribers, enter your e-mail address for full access to the Science News archives and digital editions.
