How could a thick layer of algae on the surface of a pound affect the producer that live on or near the bottom of the pond?

How does the Shark's teeth relate to its diet? What structure does bony fish have that sharks don't? Are eels almost extinct? Who takes care of the eggs or babies leafy sea dragon male or female? Could my Bronze Catfish be lying on the the gravel rarely moving because it needs other catfish? Fish have this instead of lungs? Do some girls love crushing snails bugs insects in high heels? Your platy fish has had a round belly for 4 months is she pregnant? What does a dorsla fin do for a fish? Do box jellyfish eat krill? Where did bass come from? Is sandstone safe for a fish pond? What is the percentage of people dying from salmonella typhi? Why was cod fishing important? Is the Electric Eel cold blooded or warm blooded? Where do piranhas live in Africa? Do eels shed? Can you use bitumen on ponds? Can you heat up bottled water in the microwave to put in your betta's tank? A man made pond will there be fish in it?