great diving beetle, dytiscus marginalis, male hunting on carassius gibelio, prussian carp, common wild freshwater insect and fish

animal aqua aquarium beetle behavior biotope carassius carp clear closeup coldwater common dangerous decorative diving driftwood dytiscus eco ecological endemic europe european fauna fish fishkeeping fresh freshwater gibel gibelio gray great hornwort hunt hunter hunting insect lake look macro male marginalis moderate natural nature predator protection prussian tank temperate underwater vegetation water weed widespread wild