Hydra is a common name for the larvae of the dragon family, and it is a pest that seriously harms the fry. In adult leeches, one can fix 16 to 20 tails of a fry every day and night, thus causing great harm to fry. Use kerosene to kill the leeches in the fry pool: use a thick bamboo strip, straw rope or rubber hose to form a circle with a diameter of about 1 meter, put it on the end of the fish pond, fix it on the water with a bamboo pile, and then add it to the circle. For kerosene or diesel, see a thin layer of oil film in the circle. Set a lamp 35 cm above the water surface above the circle. Because of the phototaxis of the leeches, the light at night will travel toward the lights. When the tail reaches kerosene or diesel, the valves on which the gas exchange takes place are sealed by the oil film, which causes suffocation to die. Therefore, as long as the continuous lighting kills several nights, the blisters in the fry pool can be completely killed, but there will be no side effects on the fry. Finally, use a spoon to slowly remove the oil film inside the ring.
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