keywords CORTICOTROPIN-RELEASING HORMONE FRESH-WATER Fisheries GILTHEAD SEA BREAM GROWTH-HORMONE Hematology IMMUNE-SYSTEM INDUCED THYROTROPIN RELEASE Immune response Life Sciences & Biomedicine Marine & Freshwater Biology RAINBOW-TROUT SPARUS-AURATA L. Science & Technology Sterlet sturgeon Stress markers THYROID-HORMONES TILAPIA OREOCHROMIS-MOSSAMBICUS Thyroxine injection