A fishing boat is seen in a large yellow croaker cultivation zone in the sea area of Nanji island in Wenzhou, east China's Zhejiang Province, Aug. 18, 2018. Local fishermen were busy with catching of mussel and large yellow croaker in August. Nanji Township developed mariculture and island tourism industries in recent years. It also built a market network and expanded the market of characteristic marine products. (Xinhua/Xu Yu)

A fisherman prepares to catch fish at a mariculture zone in the sea area of Nanji island in Wenzhou, east China's Zhejiang Province, Aug. 18, 2018. Local fishermen were busy with catching of mussel and large yellow croaker in August. Nanji Township developed mariculture and island tourism industries in recent years. It also built a market network and expanded the market of characteristic marine products. (Xinhua/Xu Yu)

A fishing boat is seen in a mussel cultivation zone in the sea area of Nanji island in Wenzhou, east China's Zhejiang Province, Aug. 18, 2018. Local fishermen were busy with catching of mussel and large yellow croaker in August. Nanji Township developed mariculture and island tourism industries in recent years. It also built a market network and expanded the market of characteristic marine products. (Xinhua/Xu Yu)

A fishing boat is seen in a mussel cultivation zone in the sea area of Nanji island in Wenzhou, east China's Zhejiang Province, Aug. 18, 2018. Local fishermen were busy with catching of mussel and large yellow croaker in August. Nanji Township developed mariculture and island tourism industries in recent years. It also built a market network and expanded the market of characteristic marine products. (Xinhua/Xu Yu)

Fishermen catch fish at a mariculture zone in the sea area of Nanji island in Wenzhou, east China's Zhejiang Province, Aug. 18, 2018. Local fishermen were busy with catching of mussel and large yellow croaker in August. Nanji Township developed mariculture and island tourism industries in recent years. It also built a market network and expanded the market of characteristic marine products. (Xinhua/Xu Yu)

Aerial photo taken on Aug. 19, 2018 shows a mariculture zone in the sea area of Nanji island in Wenzhou, east China's Zhejiang Province. Local fishermen were busy with catching of mussel and large yellow croaker in August. Nanji Township developed mariculture and island tourism industries in recent years. It also built a market network and expanded the market of characteristic marine products. (Xinhua/Xu Yu)

Aerial photo taken on Aug. 19, 2018 shows a mariculture zone in the sea area of Nanji island in Wenzhou, east China's Zhejiang Province. Local fishermen were busy with catching of mussel and large yellow croaker in August. Nanji Township developed mariculture and island tourism industries in recent years. It also built a market network and expanded the market of characteristic marine products. (Xinhua/Xu Yu)

Photo taken on Aug. 18, 2018 shows large yellow croaker in a mariculture zone in the sea area of Nanji island in Wenzhou, east China's Zhejiang Province. Local fishermen were busy with catching of mussel and large yellow croaker in August. Nanji Township developed mariculture and island tourism industries in recent years. It also built a market network and expanded the market of characteristic marine products. (Xinhua/Xu Yu)

A fisherman works at a mariculture zone in the sea area of Nanji island in Wenzhou, east China's Zhejiang Province, Aug. 18, 2018. Local fishermen were busy with catching of mussel and large yellow croaker in August. Nanji Township developed mariculture and island tourism industries in recent years. It also built a market network and expanded the market of characteristic marine products. (Xinhua/Xu Yu)

Aerial photo taken on Aug. 18, 2018 shows a mariculture zone in the sea area of Nanji island in Wenzhou, east China's Zhejiang Province. Local fishermen were busy with catching of mussel and large yellow croaker in August. Nanji Township developed mariculture and island tourism industries in recent years. It also built a market network and expanded the market of characteristic marine products. (Xinhua/Xu Yu)