special fish four-eyed Anableps anableps swims just below the surface of the water and looks both above and below the water at the same time

special fish foureyed anableps anableps swims just below surface water looks both above below time aquatic habitat freshwater ecosystem stream rivers eyes divided half air underwater vision binocular predatory omnivorous small scale schooling shoaling carnivorous invertebrates crustaceans zooplankton phytoplankton forage breeding behavior symbiosis decomposition filtration oxygenation photosynthesis nutrients dissolved salinity pressure migration