Thermal tolerance and oxygen consumption rates of the catfish Horabagrus brachysoma (Günther) acclimated to different temperatures

• Published in: Aquaculture Vol. 295; no. 1-2; pp. 116 - 119
• Main Authors: Dalvi, Rishikesh S., Pal, Asim K., Tiwari, Lalchand R., Das, Tilak, Baruah, Kartik
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.10.2009; Elsevier; Elsevier Sequoia S.A
• Subjects: Agnatha. Pisces; Animal aquaculture; Animal productions; Aquaculture; Biological and medical sciences; Catfish; Freshwater; Fundamental and applied biological sciences. Psychology; General aspects; Horabagrus brachysoma; Oxygen; Oxygen consumption rates; Q10; Temperature quotient; Thermal tolerance polygon; Vertebrates: general zoology, morphology, phylogeny, systematics, cytogenetics, geographical distribution; Water temperature; Horabagrus brachysoma; Temperature quotient; Q10; Thermal tolerance polygon; Oxygen consumption rates; Q; Vertebrata; Temperature; Pisces; Tolerance; Oxygen consumption; Quotient; Aquaculture
• ISSN: 0044-8486; 1873-5622
• DOI: 10.1016/j.aquaculture.2009.06.034

Thermal tolerance using critical thermal methodology and oxygen consumption rates of Horabagrus brachysoma (23.01+2.04 g) were determined after acclimating the fish to 15, 20, 26, 31, 33 and 36 °C temperature for 30 days. Critical thermal maxima, CTMax, (34.86±0.09, 38.05±0.06, 40.23±0.12, 41.79±0.09, 42.44±0.05, and 42.79±0.02) and critical thermal minima, CTMin, (13.17±0.09, 13.56±0.05, 14.15±0.10, 15.37±0.10, 16.39±0.12, and 18.37±0.04) increased significantly (P<0.05) with increasing acclimation temperatures. A thermal tolerance polygon over the range of 15 to 36 °C had a calculated area of 526.6 °C2. Oxygen consumption rate increased significantly (P<0.05) with increasing acclimation temperature between 15 to 31 °C and 33 to 36 °C. Maximum and minimum temperature quotients (Q10) were observed between 15–20 and 31–33 °C as 2.59 and 1.53, respectively. Final preferred temperature estimated from the Q10 value was between 31 and 33 °C. Results indicate that H. brachysoma has better capability for adapting to higher temperatures and suggest their culture potential in tropical regions.