Observation on the embryonic development of Pomoxis nigromaculatus and the effect of the water temperature on the embryonic development

The embryonic development of Pomoxis nigromaculatus were observed continuously, and the effects of water temperature on the embryonic development were discussed. The experimental results showed that hatching time was 40.23 h at the water temperature (24±1)℃. The Values of Q10 of embryonic development of Pomoxis nigromaculatus was 2.05, and the suitable temperature range for fertilized eggs hatching was 22℃~24℃. There was a negative correlation between water temperature and hatching time. The regression equation between temperature and hatching rate: y=25.899x-0.5 407x2-216.92（R2=0.9 217）; the regression equation between temperature and abnormality rate: y=0.5 496x2-22.857x +236.44 (R2=0.9 422); and the biological zero point of Pomoxis nigromaculatus was 10.22℃, the effective accumulated temperature was (545.14±22.60)~(554.42±22.74) ℃?h.