underwater
animal
aquatic
barbel
biotope
bottom
bubbot
burbot
cold
deep
discovery
diversity
diving
ecosystem
edible
eelpout
eurasean
europe
eutrophic
fish
fishery
fishing
food
fresh
freshwater
gadiformes
ground
lake
lota
lotidae
nature
one
pattern
pond
river
scuba
sea
single
species
swiss
switzerland
vierwaldstttersee
water
zrichsee
zugersee