Grunion

Japanese: grunion
Grunion

...Japanese hull fish also swarm to reproduce a few days after the new moon and full moon in October and November. On the sandy beaches of Southern California, a large school of grunion fish, a member of the sardine family, comes to spawn on the nighttime spring tides from March to September a few days after the new moon and full moon. The eggs laid in the sand hatch at the next spring tide and return to the sea. ...

From [Japanese sardine]

… Other closely-related species found off the coast of Japan include the Okinawan wagonfish, the Japanese anchovy, and the silver anchovy, all of which are small fish with a body length of around 10 cm. The closely-related species found in Southern California, the grunion, is known for its unique spawning habits. This species gathers in large schools and washes up onto the shore at high tide for two or three nights after the new or full moon between February and September, creating a spectacular sight. …

*Some of the terminology explanations that mention "grunion" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…日本産のイトメも10月から11月の新月と満月の数日後に生殖群泳を行う。南カリフォルニアの砂浜には3月から9月にかけて新月や満月の数日後,夜の大潮に乗ってグルニオンgrunionというトウゴロウイワシ科の魚が大群をなして産卵にくる。砂中に産まれた卵は次の大潮時に孵化(ふか)して再び海へ帰る。…

【トウゴロウイワシ】より

… 日本沿岸では,ほかにオキナワトウゴロウ,ムギイワシ,ギンイソイワシなどの近縁種を産するが,いずれも体長10cm内外の小型魚である。 南カリフォルニア産の近縁種グラニオンgrunionは特異な産卵生態で知られる。本種は2~9月の間,新月か満月の後の2~3夜,満潮時に大群をなして岸に押し寄せ,壮観を呈する。…

※「grunion」について言及している用語解説の一部を掲載しています。

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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