Art style: Cinematic Realistic. Full-length view, the entire fish visible from head to tail, shown horizontally in profile, swimming upright in correct orientation beneath river ice, centered with dark cold water filling the sides. A large Siberian sturgeon, an ancient under-ice river fish: long tapered torpedo body roughly a meter and a half, armored with five rows of bony scutes along back and flanks like a prehistoric relic. Olive-grey to dark bronze dorsal skin fading to pale cream belly, slick and faintly iridescent. Pointed shovel-shaped snout with four sensory barbels drooping before a toothless protrusible mouth. Small deep-set eyes, strong asymmetric sharklike tail, broad pectoral fins. Shafts of greenish light pierce the ice overhead, catching suspended silt. Calm, timeless, slow-gliding presence. No text. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ FINAL STYLE ENFORCEMENT (this is the authoritative rendering directive — it overrides any style wording elsewhere in the prompt): Render this image entirely in "Cinematic Realistic" style. Match the lighting grammar, material response, colour science, level of realism / stylisation, line weight, and shading model typical of "Cinematic Realistic". Keep the subject, composition, camera angle, lighting direction, and colour palette from the description above — but EVERY surface, skin, fabric, material, and environmental element must be rendered in the "Cinematic Realistic" idiom, not in any other medium.
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