What are eels scared of?

What is it in my pool that looks like spit? How would the process be different if a polder were made in a place where there is freshwater not saltwater? What will happen if you pour oil in a pond? How long do river sharks live? What was the date the pike exprdition start? What happens when your tropical fish is laying on the gravel all the time? Can your goldfish lay eggs alone? Are black mollys secondary consumers? What is the phobia of seahorses? How big can whale shark open it's mouth? Are zebra sharks friendly? Do horn sharks purr? Why do sharks live in only salt water? Do fish have an incomplete closed circulatory system? Is it safe to put a clam you fould in your aquarium tank? What kinds of fins does a clown fish have? When was Pink salmon created? What are seahorses prey? Are the teeth on the sawfish ment to scare people away? What kind of lever is a fishing rod?