Bitterling fish Rhodeus amarus swims past algae in the water

bitterling fish rhodeus amarus swims algae water aquatic habitat freshwater ecosystem stream rivers spawning eggs green underwater plants herbivore omnivore small scale carp minnow cyprinid dorsal fin scales barbels forage breeding behavior symbiosis decomposition filtration oxygenation photosynthesis nutrients dissolved oxygen invertebrates mollusks crustaceans zooplankton phytoplankton bottom substrate gravel rocks shoals