Extreme warm acclimation temperature alters oxygen consumption, micronucleus formation in erythrocytes, and gill morphol
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Extreme warm acclimation temperature alters oxygen consumption, micronucleus formation in erythrocytes, and gill morphology of rohu (Labeo rohita) fingerlings S. M. Majharul Islam & Md Mahiuddin Zahangir & Mohammad Ashaf-Ud-Doulah & Mt Marufa Khatun & Md Shahjahan
Received: 10 August 2020 / Accepted: 27 September 2020 # Springer Nature B.V. 2020
Abstract Experiencing the seasonal variation and rapid global warming in the tropical climate is a common phenomenon which challenged the aquatic organisms to adapt the physiology and behavior. To investigate the effect of high-temperature acclimation, we selected Indian major carp, rohu (Labeo rohita), a commercially important freshwater aquaculture species. Oxygen consumptions, micronucleus formation in erythrocytes, and gill histopathology were observed in L. rohita fingerlings acclimated at three temperatures (30, 33, and 36 °C) for 30 days. Results showed that the highest acclimated temperature (36 °C) induced higher oxygen consumption and increased frequency of micronucleus formation in erythrocytes. Severity of different histological alterations (hyperplasia, epithelial necrosis, telangiectasis, epithelial lifting, and hypertrophy of chloride cells) in the gills was found to be increased in the highest acclimated temperature (36 °C). These findings indicate S. M. M. Islam : M. Ashaf-Ud-Doulah : M. Shahjahan (*) Laboratory of Fish Ecophysiology, Department of Fisheries Management, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh e-mail: [email protected] M. M. Zahangir Department of Fish Biology and Biotechnology, Faculty of Fisheries, Chattogram Veterinary and Animal Sciences University, Chattogram 4225, Bangladesh M. M. Khatun Department of Aquatic Animal Health Management, Sher-e-Bangla Agricultural University, Sher-e-Bangla Nagar, Dhaka 1207, Bangladesh
the temperature induced adaptive responses and climate vulnerability in a changing environment. Keywords Climate change . Global warming . Indian major carp . Blood cells . Histopathology
Introduction Substantial seasonal variation along with the environmental temperature challenges the stenothermal animals in a fluctuating climate. Such species exhibits temperature acclimation in a narrow range, a physiological and biochemical adaptation mechanism by adjusting the metabolic rate in a week or less with the fluctuating environmental temperature (Angilletta Jr 2009). Organisms living in a tropical area evolved a narrow and stable thermal range are especially sensitive to global warming and displayed a limited capacity for the temperature acclimation (Tewksbury et al. 2008). Climate change induced by global warming increases the sea surface temperature with periodic higher local temperature (He et al. 2014). As the physiology and behavior of fishes are profoundly linked with the environmental temperature, adjustment to the environmental conditions is therefore important to survive in a changing climate. Oxygen consumption provides important insight about thermal physiology, associated with the
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