Fig. 2

Phenotypic identification and analysis of temperature-treated fish. (a) the comparative analysis of GSI between high temperature (35 °C) and normal temperature (28 °C) (T-test, *P < 0.05). (b) Histological analysis of gonad tissue. Stage IA and stage IB, primary growth stage; stage II, cortial alveolus stage; stage III, vitellogenesis stage; SC, spermatocytes; SG, spermatogonia; SZ, spermatozoa