Tide - Shiome

Japanese: 潮目 - しおめ

Also called tidal line. A band-like streak that appears on the ocean surface. In many cases, it is the contact surface (tidal boundary) of two water masses with different properties that appears on the ocean surface. There are calm ones like oil spills, foamy ones, rippling ones, and spring tides with whitecaps and triangular waves. They are formed by the convergence of flow lines, and seaweed, bubbles, and other floating objects gather there. The tidal line meanders and is accompanied by whirlpools. They tend to occur where cold and warm currents, or open ocean water and coastal water, come into contact, and in Japan, they are often found off the coast of Sanriku. They often form around reefs, capes, and islands due to topographical reasons. They are often favorable fishing grounds because schools of both warm and cold fish tend to gather together by riding the current, and the upwelling current brings up nutrients and promotes the proliferation of plankton.

Source : Heibonsha Encyclopedia About MyPedia Information

Japanese:

潮合(ちょうごう)線とも。海面にできる帯状の筋目。多くは性質の異なる水塊の接触面（潮境(しおざかい)）が海面に現れたもの。油を流したように静かなもの，泡立つもの，さざ波の立つもの，また白波や三角波がしぶきをあげる大潮目などがある。流線の収束でできるので海藻，泡などの浮遊物が集まる。潮目の線は蛇行(だこう)し，また渦巻(うずまき)を伴う。寒流と暖流の，あるいは外洋水と沿岸水の接触するところに発生しやすく，日本では三陸沖に多くできる。礁，岬，島の周辺などで地形的原因でできることも多い。流れに乗って寒暖両系の魚群が密集しやすく，また湧昇(ゆうしょう)流が栄養分を運び上げてプランクトンを繁殖させるため，有利な漁場となることが多い。

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