The main physiological difference between rays and skates is?

When is the best time for bluegill fishing on rice lake in Ontario? How many bowls of shark fin soup can you make with a shark fin? Get rid of snails? What does trout ringed pools mean? Is there a shark species named the gasping shark? Do striped bass fish eat cattail? Should you use bottle water in fish tank as live in Spain? Is a minnow bigger than a trout? What to do if betta fish is barely breathing at the bottom of tank? How many days to hatch young guppies? What does the main organ in an electric eel do? Do frogs and hermit crabs get along? How thick is 1200ga? What are these worms in my turtle tank they are barely visible white and dont appear to be able to swim as they kind of just wiggle around on the bottom I found probably a couple hundred of them? Is it true that fish only grow to their environment? What is the average price per pound for striped bass? Can a goldfish eat too much and die? Are boxfish and cowfish salt or freshwater? What is a padachond? Are sharks and rays bony fish?