In particular, waves shoal as they pass over submerged sandbanks or reefs. They eat mainly fish in length that shoal near the surface. China was also reported to have planted buoys in nearby Sabina Shoal. When waves pass over shallow areas, they shoal, as shown in the adjacent diagram. Pike feed on a wide range of food sources, predominantly smaller shoal fish. The city is drained by Joplin, Turkey, Silver and Shoal creeks. And gauntlet flings to chance, wind, shoal and tide. These include all of the Spratly Islands, the Paracel Islands, Macclesfield Bank and Scarborough Shoal. Fish prefer to shoal with their own species. Scarborough shoal lies within this area. To the northwest of Zavodovski Island is the Protector Shoal, a submarine volcano. The shoal and its surrounding area are rich fishing grounds. China afterwards sent more warships in the Scarborough Shoal. This may explain why fish prefer to shoal with individuals that resemble themselves. The Grapple, along with two Norwegian tugs removed Boulder from the shoal.