The present invention is provided with a caterpillar tank 131 formed in a concave accommodating portion so that sand and sea water are accommodated together with a worm caterpillar, a first discharge pipe 137 installed in the caterpillar tank 131, and installed in the caterpillar tank 131. It consists of a second discharge pipe 135, the second discharge pipe 135 is installed lying on the inside of the caterpillar tank 131 receiving portion and the inner part 2 pipe (1351) protruding to the outside of the caterpillar tank 131, It is made of an outer two pipe (1359) is connected to the part of the caterpillar tank (131) protruding to the outside of the inner two pipe (1351) located on the outside of the receiving portion; The part located in the caterpillar tank 131 accommodating part of the inner 2 pipe 1351 is related to the worm spawning tank 130 having a plurality of through holes 1353 formed therein; There is an effect that can effectively discharge the larvae spawned and spawned in the tank.
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