title: Effects of temperature, food deprivation and salinity on growth, RNA/DNA ratio and certain enzyme activities in rainbow trout (Salmo gairdneri Richardson).
abstract: 1. The connection between feeding regime (food deprivation and restricted diet) and thermal acclimation (1-2, 6, 11 and 16 degrees C) was studied in rainbow trout held in diluted seawater (20% S). 2. At 1 degree C, food deprivation effects on all parameters are slight, and on RNA and certain enzymes they are masked by thermal acclimation effects. 3. At a salinity of 20% rainbow trout on a restricted diet and held at 11 degrees C have the highest growth rate. 4. Owing to increasing RNA levels, the RNA/DNA quotient is significantly higher than normal in rainbow trout held at 1 degree C although the fishes do not grow at this temperature. 5. Temperature and feeding both affect the enzymes we studied (liver: G1DH, AspT, arginase, G6PDH, and 6PGDH; kidney: G1DH, AspT, arginase, and Na/K-ATPase; white muscle: AspT and A1T; gill: Na/K-ATPase) differently. Interactions between these two factors also occur in some cases.
mesh_terms: D000410:Alanine Transaminase / Q000378:metabolism; D000818:Animals; D001119:Arginase / Q000378:metabolism; D001219:Aspartate Aminotransferases / Q000378:metabolism; D004247:DNA / Q000032:analysis; D005508:Food Deprivation; D005880:Gills / Q000201:enzymology; D005954:Glucosephosphate Dehydrogenase / Q000378:metabolism; D005969:Glutamate Dehydrogenase / Q000378:metabolism; D007668:Kidney / Q000201:enzymology; D008099:Liver / Q000032:analysis / Q000201:enzymology; D009132:Muscles / Q000032:analysis; D010734:Phosphogluconate Dehydrogenase / Q000378:metabolism; D011506:Proteins / Q000032:analysis; D012313:RNA / Q000032:analysis; D012487:Salmonidae / Q000254:growth & development*; D012623:Seawater; D012965:Sodium Chloride / Q000378:metabolism; D000254:Sodium-Potassium-Exchanging ATPase / Q000378:metabolism; D013696:Temperature; D014337:Trout / Q000235:genetics / Q000254:growth & development* / Q000378:metabolism
chemical_list: D011506:Proteins; D012965:Sodium Chloride; D012313:RNA; D004247:DNA; D010734:Phosphogluconate Dehydrogenase; D005954:Glucosephosphate Dehydrogenase; D005969:Glutamate Dehydrogenase; D001219:Aspartate Aminotransferases; D000410:Alanine Transaminase; D001119:Arginase; D000254:Sodium-Potassium-Exchanging ATPase