predatory insect eats a fish fry

predatory insect eats fish fry water stick ranatra linearis predacious insects entomophagous insectivore predaceous aquatic animals invertebrates organisms arthropods biology student biophysics broadshouldered striders entomology glowing hydroecology hydrometra collection lake dwellers laws microscopic reservoir inhabitants ripple bugs riverside scarcity wildlife zoology learning underwater world fresh behavior feeding animal behaviour ecology