Shark minnow (Luciosoma bleekeri; Chinese: 布氏梭大口魚, Thai: ปลาซิวอ้าว, pla sio ao, Khmer: តែីដងដវ, trey dang dau or តែីបង្កួយ, trey bangkuy) is a species of small ray-finned fish belonging to the family Danionidae. This fish is found in Southeast Asia from the Mae Klong River to the Mekong. It lives mainly in rivers, moving into flooded forests and fields during the floods and back into the river as the floods recede. It usually swims close to the surface in schools of many individuals. It is one of the most abundant of the different types of minnow-sized fishes known as pla sio in Thailand.

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