The great Diving beetle (dystocus marginalis), Water scorpions (nepa cinerea), Two spotted water hoglouse (asellus aquaticus),horse leeches (haemopis sanguisuga), Brown hawker dragonflies (aeshna grandis), Hoverfly lava (eristalis tenax), common frog TADPOLEs (rana temporaria), Smooth newt (lissotriton vulgaris), common toad (Bufo bufo), palmate newt (Lissotriton helveticus), great crested newt (triturus cristatus), great ramshorn snail (Planorbarius corneus), caddisflies (Trichoptera), phytoplankton

Fun fact: the top most layer in a lake is called the epilimnion, it is warmer and less dense than the rest of the lake. It also typically has more dissolved oxygen and a higher ph.