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Possibly a compound of 白(shiro, “white”) + 口(kuchi, “mouth”). The kuchi changes to guchi as an instance of rendaku (連濁).
Possibly from 白(shiro, “white”) + 愚痴(guchi, “complaint, grumbling”), referring to the resemblance of the sound produced by their inflated swim bladders to a person complaining.
As with many terms that name organisms, this term is often spelled in katakana, especially in biological contexts (where katakana is customary), as シログチ.