Use the uploaded padded barracuda as the exact locked identity, right-facing direction, long muscular proportions, scale pattern, fins, tail, eye, jaw angle, teeth and premium painted 2.5D material reference. On the existing mathematically pure black #000000 matte with a completely fixed camera, create one uninterrupted five-second reversible steady-swim half-cycle. Keep the complete fish centered inside the central 70 percent with no frame travel. One restrained muscular wave moves from behind the gills through the long body into one broad caudal-fin beat; the pectoral and dorsal fins make small stabilizing corrections. The head, gaze and jaw angle remain controlled and unchanged. The motion must remain convincing when played backward; runtime owns the fast screen route. NEGATIVE PROMPT: No background, water, particles, camera movement, zoom, cut, traversal, acceleration across frame, attack, lunge, bite, jaw opening, turn, U-turn, front view, direction reversal, eel deformation, rubber body, changed scales, extra or missing fins, split or doubled tail, frame-edge contact, cropping, rigid card slide, fade, ghost, crossfade, duplicate, morphing, blur, freeze, text, logo, UI or reels.
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