Do fish got heart?
Heart: Fish have a two-chambered heart. Human hearts are four-chambered. Blood is pumped by the heart into the gills. Blood returns to the heart after going through the organs and muscles.
Does animal get heart attack?
For the most part, other animals don’t get heart attacks — not even one of our closest living relatives, chimpanzees (Pan troglodytes). Nonhuman animals experience other cardiac problems, but as far as scientists know, heart attacks are rare in other creatures.
What is the leading cause of death in fish?
The most common cause of fish kills is suffocation due to lack of dissolved oxygen. Most dissolved oxygen is produced by algae and aquatic plants through photosynthesis. A lesser but also important source of oxygen in water is diffusion from the atmosphere, which is enhanced by wind-induced surface water turbulence.