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Left above, is a male, right is a female.
Note the spots on the gill plate, of the male, note on the female , instead of spots, the striations are more linear.
Also note the different shape of the head. Females head is more streamlined/torpedo shaped
Below female left, male right.
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Below female guarding eggs
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Below, another shot of a male, note the bulkyness of the head shape.
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