Shrimp (small shrimp) - Crangon affinis

Japanese: エビジャコ(蝦雑魚) - エビジャコ(英語表記)Crangon affinis
Shrimp (small shrimp) - Crangon affinis
This shrimp belongs to the family Cranidae of Crustacea and lives on the sandy and muddy bottom of inland bays (illustration). It is 4.5 cm long. Its body is particularly flat, especially the cephalothorax. The first and second thoracic legs form pincers, with the first thoracic leg uniquely sickle-shaped and the second thoracic leg extremely thin. Its body color is brown or blackish brown, but it can easily change its body color depending on the environment. The spawning season is from November to July, with the peak season being from late February to late April. There are long-term (summer) and short-term (winter) generations in its life cycle. The long-term generation is spawned from late February to late April, and grows into medium-sized shrimp by mid-October, some of which spawn, but they grow rapidly into large shrimp until early February of the following year, when they die and live for one year.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:
甲殻綱エビジャコ科のエビで,内湾の砂泥底にすむ(イラスト)。体長4.5cm。体はとくに頭胸甲が平らである。第1,2胸脚がはさみを形成しているが,第1胸脚は独特な鎌状,第2胸脚は著しく細い。褐色ないし黒褐色であるが,環境によって容易に体色を変えることができる。産卵期は11~7月で,2月下旬から4月下旬が盛期である。生活史には長期世代(夏世代)と短期世代(冬世代)がある。長期世代は2月下旬から4月下旬に産卵されたもので,10月中旬までに中型エビに成長し,その一部が産卵するが,翌年2月上旬まで急速に成長して大型エビになり,産卵,死亡する寿命1年の群れである。

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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