A comparison of the physiological responses to heat stress of juvenile and adult starry flounder (Platichthys stellatus)

Water temperature is the most important factor in fish farming as changes water cause physiological stress fish. There have been few studies on responses to high temperatures, which vary with aging. This study investigated of juvenile and adult Platichthys stellatus heat stress. Plasma cortisol, glucose, lactate, lysozyme levels, antioxidant enzyme activities, expression shock proteins 70 90 (HSP70 HSP90) P. were determined at temperatures 16, 20, 24, 28, 30°C. As a result, it was confirmed that several plasma parameters significantly higher than under cortisol glucose levels increased 24 28°C. lactate level Comparisons survival showed juveniles better thermal tolerance, resulting cumulative rate. Moreover, relationship between tolerance HSP gene revealed HSP70 HSP90 upregulated 28°C both fish, It judged adult’s activity lower juvenile, so demand for response relatively high, whereas juvenile’s 28°C, indicating stable value parameters. These results indicate greater based differences expression. findings improve our understanding age-related during may help guide management farms.