The Mitogen-Activated Protein Kinase (MAPKs) Expression and Primary Stress Hormone (Cortisol) of Clarias sp. Juvenile in Different Light Intensity

Clarias sp. is one of major genera freshwater catfish and also common commodity in tropical aquaculture. Excessive light intensity expected to be responded by fish as environmental stressors. Fish that experience stress will increase the secretion catecholamine, cortisol, blood glucose levels p38 MAPKs catfish. The different lights affect physiological processes. purpose this study was analyze responses (Level glucose, primary hormone (Cortisol) MAPKs) which were incubated at 300 collected from Kepanjen Regency, East Java. Blood meat sampling are carried out test profile MAPKs. experimental research stage transferred aquarium (50 x 30 cm) setted (0 lux (control), 400 lux, 800 1200 lux). Each filled with 15 kept it for 21 days. Quantificationof parameter using ELISA method. result showed highest peak (cortisol) 34±1,50 ng/mL, 120±3,4 mg/dL, MAPK 97±1,1 %. All achieved treatment on 2nd week.