Summary Planktivorous fish (fish that eat plankton) abundance and size structure are indicative of the ability of the ecosystem to capture nutrients provided by the influx of plankton. These could b species that specialize in plankton, or juvenile stages of other species that eat plankton. Focus species: Blue rockfish General Information Sustainability Goal Goal 5. Protect and enhance environmental conditions by improving watershed, floodplain, and aquatic condition and processes.