underwater scene, tropical fish, vibrant colors, feeding action, small fish, big fish, coral reef, seaweed, mobile gaming, touch controls, dynamic lighting, clear water, bubbles, fish school, survival gameplay, realistic textures, 3D environment, interactive ecosystem, close-up view, side view, fish growth stages, predator-prey interaction, soft shadows, sun rays underwater, aquatic plants, sandbox mode, user interface icons, touch feedback, haptic vibration, mobile device frame.