This is a female Chirolophis japonicus fringed blenny, which is a prickleback, guarding its eggs. This fish tends to find deep crevices and holes and lay its eggs in the back of its chosen hideaway. The eggs are the white mass visible in the background. On average, the eggs require around 40 days to mature and hatch. This individual is infested with parasites (Elaphognathia discolor). There are at least 36 visible from this angle, the most prominent of which is visible below and forward from the fish’s right eye.
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