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Y bone on nape short & broadwhite spots on head & body variable in sizeC: central dark stripe usually extends onto tail base
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Y bone on nape long, narrowhead and back: white spots small, dense, uniform in sizeC: central dark stripe usually not extending onto tail base
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upper body: dark-edged white spotsD 2-3 oblique black barsC: 2-5 elongate black spots
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top head - bones exposedjuv: blackish, fins pale + dark base, LL palechin - bony converging ridgesbehind operculum: 1 blunt, flat spine
back brown + many small spots; fin bases dark