Paddlefish (Polyodon spathula) can be said to be one of the fastest growing fish in freshwater fish, with migratory habits. Their principle food is the plankton in the water. Paddlefish is a kind of eurythermic fish, not afraid of low temperature. Even if the surface is frozen, it can survive as long as there is enough dissolved oxygen in the water. It can also withstand high temperatures. Although the high temperature in summer causes the pond surface temperature to be high, the Paddlefish can also lives normally inside.