Physiological and metabolic responses in juvenile Colossoma macropomum exposed to hypoxia
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Physiological and metabolic responses in juvenile Colossoma macropomum exposed to hypoxia Luanna do Carmo Neves & Gisele Cristina Favero & Suzane Lilian Beier Nathália Soares Ferreira & Glauber David Almeida Palheta & Nuno Filipe Alves Correia de Melo & Ronald Kennedy Luz
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Received: 16 May 2020 / Accepted: 25 August 2020 # Springer Nature B.V. 2020
Abstract This study aimed to evaluate hematological, biochemical, and gasometric parameters of tambaqui juveniles (Colossoma macropomum) exposed to hypoxia and subsequent recovery. Six animals were subjected to normoxia (basal) treatment with dissolved oxygen (DO) 6.27 ± 0.42 mg L−1. Water flow and aeration were reduced for 3 days (hypoxia), during which DO was 0.92 ± 0.37 mg L−1. Water flow and aeration were then reestablished with DO remaining similar to basal. The treatments were as follows: normoxia (basal); 24 h after initiating hypoxia (24H); 72 h after initiating hypoxia L. do Carmo Neves : G. C. Favero : N. S. Ferreira : R. K. Luz Departamento de Zootecnia, Laboratório de Aquacultura, Universidade Federal de Minas Gerais, Avenida Antônio Carlos, n° 6627, Belo Horizonte, MG CEP 30161-970, Brazil S. L. Beier Departamento de Clínica e Cirurgia Veterinárias, Universidade Federal de Minas Gerais, Avenida Antônio Carlos, n° 6627, Belo Horizonte, MG CEP 30161-970, Brazil
: N. F. A. C. de Melo
G. D. A. Palheta Instituto Socioambiental e dos Recursos Hídricos, Programa de Pós-graduação em Aquicultura e Recursos Aquáticos Tropicais, Universidade Federal Rural da Amazônia, Avenida Presidente Tancredo Neves, N° 2501 Bairro: Terra Firme, Belém, PA Cep: 66.077-830, Brazil R. K. Luz (*) Escola de Veterinária, Departamento de Zootecnia, Laboratório de Aquacultura – LAQUA, Universidade Federal de Minas Gerais, Av. Antônio Carlos, 6627, Belo Horizonte, MG CEP 31270-901, Brazil e-mail: [email protected]
(72H); 24 h after reestablishing normoxia (24R); 48 h after reestablishing normoxia (48R); and 96 after reestablishing normoxia (96R). The highest glucose level was recorded at 24H (P < 0.05); the highest lactate level was at 72R; and the highest blood pH was at 24H and 72H (P < 0.05). The highest concentration of PvCO2 was at 24H (P < 0.05), while at 96R it was equivalent to basal (P > 0.05). The variable PvO2 was only higher than basal at 24R (P < 0.05). Juvenile C. macropomum managed to reestablish the main stress indicators (glucose and lactate) at 96R, while the other indicators varied during the study, with homeostatic physiology being reestablished during the recovery period. Keywords Hypoxic stress . Stress physiology . Native fish . Tambaqui
Introduction Fish experience many repetitive and chronic stressors when in captivity due to confinement, high density, and variation in water quality parameters, including low oxygen levels or hypoxia. Diaz and Rosenberg (1995) define hypoxia in aquatic environments as when the dissolved oxygen (DO) concentration is less than 2.8 mgO2 L−1, which can negatively affect the behavior, growth, food intake, and physiological state of fi
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