To provide a shellfish culture tank which uses a circulation culture tank having participation plates disposed in the water tank to control the directions of water flows and the quantities of the water flows, thereby easily transferring water in a culture tank, stabilizing the quality of the water, and well growing the shellfishes in a proper environment, and to provide a shellfish culture method using the shellfish culture circulation tank.

This shellfish culture tank 1 which has partition plates 3α, 3β disposed in a water tank 2 having water drain port 10b and water introduction port 10a in a mutually separated state in an inclined state, cleans and sterilizes the drained water from the water drain port 10b and returns it to the water introduction port 10a to circulate the water in the water tank 2 and simultaneously culture shellfishes is characterized by forming water-passable penetrated holes 3a, 3b in the partition plates 3α, 3βand forming the penetrated holes 3a, 3b at such positions that the penetrated hole positions of the adjacent participation plates are vertically reverse to each other in the vertical direction of the water tank 2.