The firmer you grasp the fish, the more complete your understanding of sea life will become. Underwater labcoat completely necessary for this step, unlike breathing apparatuses like a snorkel or a regulator. Real marine biologists grow gills upon getting their diploma.
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“[R-18]「最近の落書きまとめ（艦これ）」/「野良ヒグマ」の漫画 [pixiv]
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