Translation of "Reefs" in Japanese

So when giant clams start to disappear from coral reefs,

もしオオジャコガイが 姿を消し始めたら

It turns out that giant clams have a giant impact on coral reefs.

実はオオジャコガイは サンゴ礁と 深い関わりがあることがわかります

So, people walking around reefs could even still stand on one that's you know, trying to hide away from predators during the day.

だから昼間 サンゴ礁を歩いてる時に 隠れてるのを 踏む人もいるんだ