Blue mussel (purple-lipped mussel)

Japanese: ムラサキイガイ(紫貽貝) - ムラサキイガイ(英語表記)blue mussel
Blue mussel (purple-lipped mussel)
A bivalve mollusk of the Mytilidae family (illustration). The shell is egg-triangular and narrows towards the apex. It is 9 cm long, 5 cm high, and bulges 3.5 cm. It is thin and blue-black, but the ventral side is brown and shiny. It attaches to rocks and other objects by extending its byssus from the gaps on the ventral sides of its shells. The inner surface is bluish-white. Its small legs extend their byssus and move by attaching them to local objects. They feed on plankton and suspended organic matter. The spawning season in Japan runs from December to around April of the following year, with one parent oyster releasing around 12 million eggs.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:
イガイ科の二枚貝(イラスト)。殻は卵三角形で殻頂のほうへ狭くなる。長さ9cm,高さ5cm,膨らみ3.5cmになる。薄質で黒青色であるが,腹側は褐色を帯び,光沢がある。左右の殻の腹側の隙間から足糸を出して岩などに付着する。内面は青白色。足は小さくて,足糸をのばし地物につけて移動する。プランクトンや浮遊有機物を食べる。日本での産卵期は12月より翌年4月ころまでで,1匹の親貝が1200万粒ほどの卵を放出する。

出典 株式会社平凡社世界大百科事典 第2版について 情報

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