Both 藻 (ソウ) and 類 (ルイ) use their On'yomi. あおい and もるい incorrectly use Kun'yomi for 藻. そうじ misreads 類. It refers to a large and diverse group of photosynthetic organisms that live in water, ranging from microscopic plankton to large seaweeds.
藻 (ソウ) も類 (ルイ) も音読みです。「あおい」や「もるい」は藻の訓読み誤用。「そうじ」は類を誤読。水中に生息し、光合成を行う生物の総称です。
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