Assessment of Osteobrama belangeri (Pengba), a high-value medium carp endemic to North-east India for thermal tolerance limits

Pub Date : 2023-09-30 DOI:10.21077/ijf.2023.70.3.131143-18

Sanjay Kumar, Sevok Das, Chandan Handique, Debnath, S. G. Singh, Prasanta Mahanta

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Abstract

Critical thermal maxima (CTmax), lethal temperature maxima (LTmax), opercular respirationrate (ORR - movement of operculum per minute), temperature quotient (Q10) and stressmarkers of Osteobrama belangeri (Pengba), a high-value medium carp endemic tohilly ecosystems of North-east India, were examined with the aim of understanding itsaquaculture potential and management requirements in the event of a temperature rise.Fish (7.82±0.35 cm/4.64±0.36 g) were acclimatised at 20, 25 and 30°C in insulated tanks(10 fish per tank) for 30 days. They were then exposed to a water temperature increase(@ 1°C day-1) using a locally-fabricated thermostat and assessed for CTmax, LTmax and ORR.As the acclimation temperature increased from 20 to 30°C, CTmax, LTmax and ORR of thefish significantly increased. Regression analysis indicated a strong positive correlationbetween acclimation temperatures and CTmax (y = 0.22x + 33.55, R² = 0.97) and LTmax(y = 0.27x + 32.86, R² = 0.99). Fish blood samples were collected at the endpoints ofCTmax and LTmax and analysed for serum alkaline phosphatase (ALP) activity. The resultsindicated that the fish experienced maximum stress at an acclimation temperature of 30°C(ALP: 38.7 U l-1), followed by 25°C (35.6 U l-1) and 20°C (31.7 U l-1). The results suggestedthat a water temperature increase above 30°C can impair the physiology of O. belangeri andconsequently, their reproductive competence. Therefore, in such events, proper managementand additional care are necessary to protect them from extinction. Keywords:Critical thermal maxima, Lethal temperaturemaxima, Osteobrama belangeri, Thermal limit,Temperature quotient

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对印度东北部特有的高价值中型鲤鱼 Osteobrama belangeri（Pengba）的耐热极限进行评估

对印度东北部丘陵生态系统特有的高价值中鲤 Osteobrama belangeri（Pengba）的临界最高温度（CTmax）、致死最高温度（LTmax）、厣呼吸速率（ORR - 每分钟厣的运动）、温度商数（Q10）和应力指标进行了研究，目的是了解其水产养殖潜力以及在温度升高时的管理要求。将鱼（7.82±0.35 厘米/4.64±0.36 克）分别在 20、25 和 30°C 的保温箱中（每箱 10 条鱼）驯化 30 天。随着驯化温度从 20°C 升至 30°C，鱼的 CTmax、LTmax 和 ORR 显著增加。回归分析表明，驯化温度与 CTmax（y = 0.22x + 33.55，R² = 0.97）和 LTmax（y = 0.27x + 32.86，R² = 0.99）之间存在很强的正相关性。在 CTmax 和 LTmax 终点采集鱼血样，并分析血清碱性磷酸酶 (ALP) 活性。结果表明，鱼类在适应温度为 30°C 时承受的压力最大（ALP：38.7 U l-1），其次是 25°C（35.6 U l-1）和 20°C（31.7 U l-1）。结果表明，水温升至 30°C 以上会损害白龙鱼的生理机能，进而影响其繁殖能力。因此，在这种情况下，有必要进行适当的管理和额外的照料，以保护它们免遭灭绝。关键词：临界最高温度；致命最高温度；Osteobrama belangeri；热极限；温度商数

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