Thermal tolerance and oxygen consumption rates of the catfish Horabagrus brachysoma

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• 作者：Rishikesh S. Dalvi ; Asim K. Pal ; Lalch ; R. Tiwari ; Tilak Das ; Kartik Baruah
• 关键词：Horabagrus brachysoma ; Thermal tolerance polygon ; Oxygen consumption rates ; Temperature quotient ; Q₁₀
• 刊名：Aquaculture
• 出版年：2009
• 出版时间：1 October 2009
• 年：2009
• 卷：295
• 期：1-2
• 页码：116-119
• 全文大小：245 K

文摘

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, CT_Max, (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, CT_Min, (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.