I worked as an intern on the Guppy Project, a long-term evolutionary ecology project run by Dr. David Reznick of University of California Riverside, and others. The project studies natural selection and evolution in real time, by censusing guppy populations living in different streams, and under different predation pressures. 

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Monthly, all fish from each of the four streams are caught. In the lab, individuals are identified, weighed, and photographed, and new individuals are given unique identifying marks. Then, the fish are returned to the exact place they were caught in the stream, and left until they are caught again the following month. 

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This is an excellent opportunity to gain fieldwork experience, and if you're interested in joining the intern team, you can find more information here: