Brown trout (Salmo trutta fario) is an important fish species for recreational fishing because of its aquaculture potential, economic worth, and widespread consumer demand. In aquaculture, the primary focus in thermal induced triploidization is the production of sterile fish which prevent negative effects on growth and survival related to the gonadal maturation. The present study was conducted in government trout farm Laribal, Srinagar to observe effects of various heat shock treatments on the fertilization and hatching rates of eggs in brown trout (S. trutta fario). Four heat shock treatments and a control group in three replicates were observed. The highest fertilization rate among the treatment groups was observed in group T2 (26°C, 20 minutes after fertilization) with 87.55±0.54%. There was a significant difference (P<0.05) between the treatment groups and control group. It was found that the fertilization rate was higher in control group (92.32±0.51%) as compared to tr

Salmo trutta fario), Heat shock, Eggs, Fertilization, Hatching.

The present study revealed that the heat shock treatment had a significant influence on the development of eggs in brown trout. Fertilization and hatching rates were observed to be significantly higher in control groups compared to the treatment groups. Furthermore, it was observed that increasing the intensity of the heat shock lowered the fertilization and hatching rates. However, the fertilization and hatching percentage continued to rise when the duration of shock initiation after fertilization was increased.

Bazaz, A.I., Shah, T.H., Ahmad, I., Bhat, F.A., Abubakr, A., Bhat, B.A., Malik, R., Mushtaq, S.T. and Nafhat-Ul-Arab (2021). Influence of Thermal Shock intensity on the Early Developmental Stages of Eggs in Cold Water Salmonid species, Brown Trout (Salm