Sublethal temperature stress in juvenile Labeo rohita (Ham-Buch.) and Rita rita (Ham.): some physiological changes.
Juveniles of fish L. rohita and R. rita subjected to a rapid (5 min) sublethal temperature increase from 28 to 35 degrees C showed significant increase in cortisol and decrease in interrenal ascorbic acid. Hypercholesterolemia, hyperglycemia and hyperlactemia were also evident accompanied by increased blood haemoglobin and haematocrit and stable protein levels. Compensatory responses were initiated within 72 hr in both the fishes. R. rita recovered more quickly indicating it to be more resistant to the heat stress than L. rohita. Hence fishes subjected to sublethal temperature stress should be given a metabolic recovery period of 72 hr prior to further stress being applied.
Das
Manas Kr
MK
Central Inland Capture Fisheries Research Institute, Barrackpore 743 101, India. Cifri@giasc101.vsnl.net.in
Dutta
Tanusree
T
Acharya
Subhendu
S
Bhowmick
S
S
D000222:Adaptation, Physiological; D000818:Animals; D001786:Blood Glucose / Q000032:analysis; D005399:Fishes / Q000502:physiology*; D018882:Heat Stress Disorders / Q000503:physiopathology*; D006454:Hemoglobins / Q000032:analysis; D006854:Hydrocortisone / Q000097:blood
D001786:Blood Glucose; D006454:Hemoglobins; D006854:Hydrocortisone