Color (fishing) - Color

...Fish jump around and spin around, and sometimes the water becomes mortar-shaped and hollow, so it is also called "makidoromi," "makiio," or "suribachiio." It is common to estimate the movement and state of schools of fish from the state of the sea surface, and there are many other words that have been passed down by fishermen, such as "awa" (bubbles blown by sardines and other fish float on the water surface), "iro" (the water color changes from white to black to red depending on how the school of fish gathers), "hiki" or "shiki" (at night, the movement of schools of fish in the sea is estimated from the glow of bioluminescent creatures such as night worms), "waki" (schools of fish gather on the surface and the water surface rises), and "seri" (the sea surface is made to bubble up by schools of sardines and other fish). [Makoto Shimizu]. ...

*Some of the terminology explanations that mention "iro (fishing)" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…魚は跳ね回ったり，ぐるぐる回ったりし，水がすり鉢形に中くぼみになることもあるので，〈まきどろみ〉〈まきいお〉〈すりばちいお〉などともいわれる。海面の状態から魚群の往来，状態を推定することはよく行われ，ほかにも〈あわ〉(イワシなどの吹き出す泡が水面に浮かぶ)，〈いろ〉(白み･黒み･赤みなど魚群の集まりぐあいで水色が変化する)，〈ひき〉あるいは〈しき〉(夜間，海中のヤコウチュウなど発光生物の光る様子から海中での魚群の動きを推定する)，〈わき〉(魚群が表層に密集して水面が盛り上がる)，〈せり〉(イワシなどの群れによって海面がざわざわ泡立つ)など，いろいろの語が漁業者に伝承されている。【清水 誠】。…

※「いろ（漁業）」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