N a net suspended vertically in the water to trap fish by their gills in its meshes 刺网 [fishing]
They get caught up in the gill nets.
它们被刺网捕获。
Such small-scale, traditional fishing methods are far less hazardous to botos than the growing use of gill nets, which can entrap and quickly kill dolphins.
这种小规模，传统的打渔方法，相比刺网捕鱼，危害性要小得多。
Already critically endangered, about 15 percent of those remaining are killed each year in gill nets, the organization said.
牠们已经严重濒危，残留者中的大约15%每年在刺网中被杀死，该组织说。
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