Figure 1. Field observation of embryonic mortality. (A) Sampling sites in Taihu Lake; (B) Embryo collected by water grass, red arrow point to crucian carp embryo; (C-E) Embryonic mortality in different sites from 2016-2018; (c1) Dead embryo, black arrow point to dead cell mass. ** p < 0.01, *** p < 0.001.