Climate-driven aquatic heatwaves increase the risk of prolonged thermal stress for fish, yet the resilience and adaptability of teleosts to chronic heat exposure during juvenile stages remain poorly understood. This study used juvenile zebrafish as a model to evaluate the effects of chronic exposure to 34°C and the potential for recovery after one month. Juveniles were subjected to four treatments: T1 (28°C for 60 days), T2 (28°C for 30 days, 34°C for 30 days), T3 (34°C for 30 days, 28°C for 30 days), and T4 (34°C for 60 days). Results showed significant growth impairment after 60 days of heat exposure compared to controls. Elevated temperature exposure led to the upregulation of hepatic transcripts (serpinh1b, hsp70, hsp90aa1, and got1), which returned to baseline after recovery. Histopathological and transcriptomic analyses demonstrated alterations in hepatic cellular vacuolation and glycogen deposition, along with an increase in transcription of the gys2 gene following exposure to 34°C. These reported effects observed in fish exposed to 34°C for 30 days remained consistent following 60 days of exposure. Our findings demonstrate the complex and resilient stress responses of fish to sustained high temperatures, highlighting their adaptive potential and the reversible nature of heat-induced effects during aquatic heatwaves.