How many hearts does a salmon fish have?

Are striped bass primary consumers? What is the gestation period of cod? What are marine species? What is the kingdom for big mouth bass? Why do meat and fish stay fresh in cans? What does it mean when a betta is breathing fast? How many salmon in salmon farms? How can you tell the difference in male and female sunburst platy? Can a squid kill an orca? Do great white sharks die by oil spills? Ring shaped island? How do you treat a sick betta? How do goldfish use locomotion? Can different breed of fish mate? Why causes fishy burps? Do plecos need heaters? Fish and other aquatic life depend on oxygen gas dissolved in the water. Which event is most likely to harm aquatic life by reducing the oxygen concentration of the water? What would happen to other oraganisms in a salt marsh ecosystem if the cord grass suddenly died? My betta fish is floating on its side at the top of the tank and looks like its dead but it isnt and its stomach is bloated. does it have dropsy? Is there a site so you could see if your tank is overcrowded You would type in the measurements of your tank then choose what fish you would want in your tank.?