Náměty na pokusy a pozorování vodních živočichů ve školním akváriu (III, Potravní chování)

Filter-feeding activity can be presented in bivalve mollusks (e.g. zebra mussel Dreissena polymorpha) removes
phytoplankton and other suspended matter from the water column, both through ingestion and sedimentation of particles.
Scrapers, which are often also referred to as grazers, include also e.g. snails and many types of immature aquatic
insects. Scrapers feed on substrata surfaces, consuming attached algae, heterotrophic components of biofilms, and associated
deposited organic sediments. Scrapers like the apple snail (Pomacea), algae eater (Gyrinocheilus), bristlenose catfish
(Ancistrus) can be demonstrated in school aquaria. Predators like dragonflies have long mouthparts that extend. They are
examples of predators that hunt mostly by sight. Some other predators hunt by scent. Animal ambush predators usually
remain motionless (sometimes hidden) and wait for prey to come within ambush distance before pouncing (see e.g. water
stick insect Ranatra linearis, water scorpion Nepa cinerea). Extra-oral digestion can be demonstrated by larvae and adults
of the great diving beetle (Dytiscus marginalis).