Underwater Forest Stream Photography

Shot with a high-definition underwater photography camera, capturing real underwater natural scenery inside {argument name="environment description" default="a clear, shallow stream beside a tropical primeval forest"}. Vertical composition, 3:4 ratio, medium-to-long shot. The lens is slightly below the waterline; the shimmering underside of the water's surface is visible at the top of the frame, with realistic ripple refraction and natural reflections. Sunlight slants into the water from the upper right, forming soft light beams and underwater light spots; in the upper right there are dark reflections and shadows of large tree branches, occupying part of the composition. The middle of the frame is calm, clear stream water with slight suspended particles; {argument name="number of fish" default="5-8"} native small freshwater fish swim naturally, mostly gray-silver and light brown in color, varying in size and distance, not forming a neat school. On the streambed, naturally growing deep green, yellow-green, and brownish-green water plants sway gently with the current, distributed naturally, not like an artificial aquarium. The bottom consists of grayish-brown fine sand, gravel, pebbles, and a few naturally shaped rocks, with the rocks showing slight algae traces and a water-worn feel. There are several springs at the bottom, shown as fine sand slowly welling up from small holes, forming a light cloud of sand grains and localized water disturbance — not white smoke, not steam, not a large amount of bubbles. Real natural-scenery photography, with the feel of a high-end nature documentary, close to authentic National Geographic-style ecological photography; the water is clear, the lighting natural, the colors restrained, with realistic underwater optical effects, slight grain, natural depth of field, and high-definition detail. No people, no buildings, no artificial traces, no text, no border, no logo. Avoid a CG look, an aquarium look, coral reefs, exaggerated schools of fish, oversaturated green, dreamy light effects, and plastic water plants.