Domain: Natural Science — Morphology
Target concept: Sexual dimorphism in Lake Malawi mbuna cichlids (e.g., Pseudotropheus/Metriaclima zebra): Males exhibit bright blue and yellow coloration, while females display a silvery gray color.

Video generation prompt: Adult male and female African cichlids were placed side by side in an aquarium, with the female on the left and the male on the right.

Evaluation guide:
(i) Target concept: Visual demonstration of sexually dimorphic coloration as a fixed phenotypic trait in adult Lake Malawi mbuna cichlids (e.g., Pseudotropheus/Metriaclima zebra).
Minimum mechanism: Fish must be biologically mature (not juveniles); the male and female must belong to the SAME mbuna species or color morph (e.g., both Metriaclima zebra), since sexual dimorphism is by definition a within-species, cross-sex comparison; pairing a male and female of different species would not demonstrate this trait; both fish must express stable, non-stress-induced coloration; the aquarium environment must permit an unobstructed lateral view under steady, neutral lighting.
(ii) Storyline: Frame opens on a static front-facing view of the aquarium → two adult mbuna cichlids of the same species/morph enter or settle into fixed left (female) and right (male) positions → both remain fully visible and laterally oriented → the female keeps a uniform silvery gray appearance throughout → the male keeps his dominant blue/yellow appearance throughout → the left-right arrangement stays fixed → no motion, lighting, or rendering artifact hides the color difference between them.

Manual:
Experimental Procedure
1. Place one adult female Lake Malawi mbuna cichlid (e.g., Pseudotropheus/Metriaclima zebra) on the left side of a clear rectangular aquarium.
2. Place one adult male of the SAME mbuna species (or same recognized color morph) as the female on the right side of the same aquarium — sexual dimorphism compares males and females of one species, not two different species.
3. Ensure both fish are fully visible, stationary or gently swimming, with no occlusion.
Observation of Experimental Phenomena
The female appears uniformly silvery gray; the male, of the same species, appears brightly colored with dominant blue and yellow pigmentation; the left-right color contrast is immediately visible.
Summary of Experimental Principles
Sexual dimorphism in Lake Malawi mbuna cichlids: adult males exhibit bright blue and yellow coloration, while females of the same species display silvery gray coloration — a well-documented example of sexual dichromatism within the African cichlid family.

Prompt Grounding rubric:
level_1: No aquarium is shown, or no cichlids are visible, or only one fish appears, or the two fish are never shown together in the same shot, or the spatial order is reversed (the male is not on the right or the female is not on the left), or neither fish is recognizable as an adult mbuna-type cichlid.
level_2: An aquarium is shown with two cichlids, but at least one of the following holds: (a) the female is not on the left or the male is not on the right; (b) either fish looks juvenile: small-bodied and uniformly pale, lacking the adult male's blue/yellow pattern or the adult female's steady gray tone; (c) the two fish overlap, are cut off by the frame edge, or are otherwise not both fully visible at once; (d) the two fish appear in separate tanks or separate shots rather than sharing one aquarium; (e) the male and female belong to visibly different species or color morphs (a cross-species pairing), which would not demonstrate within-species sexual dimorphism.
level_3: An aquarium holds two adult mbuna-type cichlids side by side in one continuous shot, the female on the left and the male on the right; both fish are fully visible, either stationary or swimming gently, without overlapping each other; both fish show the robust, single-dorsal-fin body typical of adult mbuna cichlids (no elongated fins, no fry-like proportions); the male and female are recognizable as the same mbuna species or color morph rather than two different species; no other fish or species share the frame; the left-right layout matches posted_prompt.
level_4: All 3-point conditions satisfied AND the female stays on the left and the male stays on the right for the whole clip, with neither fish drifting across the tank's midline or swapping sides; no plants, rocks, or décor are introduced that block a clear view of either fish's flank; the camera holds a stable, roughly frontal framing that keeps both fish's sides visible (not a steep top-down or head-on angle).
level_5: All 4-point conditions satisfied AND the left-right identity of the two fish is never thrown into doubt: (a) neither fish turns far enough to swap which flank faces the camera; (b) the shot is never mirrored or horizontally flipped; (c) any camera pan or zoom keeps each fish on its correct side of the frame relative to the other; (d) both fish stay fully in frame for the whole clip, with no cut, jump cut, or sudden repositioning.

Scientific and Causal Correctness rubric:
level_1: No color differentiation between fish; or both fish display identical coloration (e.g., both blue-yellow or both silvery gray); or colors are biologically implausible (e.g., red male, green female); or non-cichlid species shown (e.g., angelfish, goldfish); or coloration contradicts African cichlid sexual dimorphism entirely.
level_2: Two fish present with some color difference, but at least one violates subject knowledge: (a) female displays bright blue/yellow patches or iridescence; (b) male displays uniform silvery gray without blue/yellow elements; (c) either fish shows mottled, striped, or patterned coloration inconsistent with typical adult *Metriaclima* or *Pseudotropheus* morphology; (d) coloration appears washed out, monochromatic, or desaturated to point of indistinguishability.
level_3: Female cichlid exhibits uniform silvery gray coloration across body and fins; male cichlid exhibits dominant bright blue and yellow coloration across body and/or fins; no visible hybrid/mixed patterning; both fish are morphologically consistent with adult African cichlids (robust body, single dorsal fin, no elongated fins); color contrast is visually distinct and stable across frames.
level_4: All conditions for score 3 met, AND coloration is regionally accurate: (a) male’s blue appears on dorsal surface/head/flanks, not ventral belly; (b) yellow appears on anal fin, caudal peduncle, or lateral stripe, not as full-body wash; (c) female’s silvery gray is uniform with no blue/yellow accents anywhere; (d) no transient color shifts (e.g., stress-induced darkening) that obscure dimorphism.
level_5: All conditions for score 4 met, AND color fidelity is absolute: (a) male shows *no* silvery gray patches larger than incidental scale reflection; (b) female shows *no* blue or yellow pigment, zero chromatic deviation from neutral silvery gray; (c) neither fish exhibits chromatophore activation/deactivation artifacts (e.g., flickering, pulsing, or frame-to-frame hue jumps); (d) color appearance remains consistent under uniform lighting with no false saturation or hue shift.

Spatiotemporal Consistency rubric:
level_1: Video contains teleportation (sudden position jump), structural break (fish body discontinuity), or severe distortion (e.g., fisheye warping, stretch, shear); or abrupt light/shadow change that cuts continuity (e.g., flash, black frame, strobing); or fish disappears/reappears mid-video.
level_2: At least one major spatiotemporal flaw: (a) fish moves so rapidly its outline blurs beyond recognition for ≥1 consecutive second; (b) aquarium background shifts abruptly (e.g., wallpaper scroll, parallax jump); (c) lighting changes cause persistent overexposure/underexposure masking fish features for ≥1 second; (d) inter-frame motion is jerky or stuttering with ≥2 visible frame skips or holds.
level_3: No teleportation, structural breaks, or abrupt lighting changes; fish move smoothly with natural swimming motion; aquarium background remains stable; lighting is consistent; no visible frame drops, freezes, or stutter; all motion is physically plausible for aquatic environment (no gravity-defying floats or rigid floating).
level_4: All conditions for score 3 met, AND motion is consistently fluid: (a) no motion blur that obscures sex-specific coloration on either fish; (b) no parallax instability (e.g., background sliding relative to foreground when fish moves); (c) no perspective warp (e.g., fish shape distorting as it swims laterally); (d) no inter-frame misalignment causing “jitter” in fish outline or eye position.
level_5: All conditions for score 4 met, AND temporal continuity is perfect: (a) zero frame duplication or omission detectable by eye; (b) no micro-jitters in camera position or zoom; (c) fish maintain constant depth plane (no perceived z-axis pop-in/pop-out); (d) water surface refraction and caustics behave consistently, no unnatural shimmer suppression or artificial stillness.