Do sardines use gills to breath?

What is the meaning of Salmon in food items? DO Flies come from rotten meat because they always appear where meat is rotting? Is too much mercury from fish bad for the body? How do you stop hawks from eating fish? Do bass like deep or shallow water better? What are blob fish classified as? What are the types of sharks? What is good about bonefishing? Why do you need to acclimatise the water for a fish? What is the value of a Heddon 270-R Fishing Reel? What is the physical conditions of the pond? What are symbols for determination? What is the role of the freshwater stingray in ecology? What is 1 yard of gravel? Is the shark a consumer? What are the four secondary consumers in the salt marsh community? How big do peacock cichlids get? Is the pelvis a vestigial structure for a shark? How much water do fiddler crabs need? When will all the sharks go extinct?