title: Effect of nutritional factors and cortisol on tyrosine aminotransferase activity in liver of brook trout, Salvelinus fontinalis Mitchill.
abstract: 1. Starvation for over 50 days increased the activity of Tyrosine aminotransferase (TAT) from brook trout liver and decreased liver glycogen. 2. Cortisol (6-40 mg/100 g body wt) increased TAT activity, optimally 72 hr post-injection; liver glycogen response to cortisol was variable while tissue water either increased or remained constant. 3. Fish fed high-protein/low-carbohydrate had greater TAT activity than fish fed low-protein/high carbohydrate. There was food-induced peak of activity indicating a "diurnal rhythm" analogous to that of rat TAT. 4. TAT activity in brook trout appears to be correlated with protein catabolism.
mesh_terms: D000818:Animals; D001834:Body Water / Q000032:analysis; D004032:Diet; D006854:Hydrocortisone / Q000494:pharmacology*; D008099:Liver / Q000201:enzymology*; D008112:Liver Glycogen / Q000032:analysis; D012487:Salmonidae / Q000378:metabolism*; D013217:Starvation; D014337:Trout / Q000378:metabolism*; D014444:Tyrosine Transaminase / Q000378:metabolism*
chemical_list: D008112:Liver Glycogen; D014444:Tyrosine Transaminase; D006854:Hydrocortisone