Thermal Modulation of Monoamine Levels Influence Fish Stress and Welfare
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Fecha
2018-12
Profesor/a Guía
Facultad/escuela
Idioma
en
Título de la revista
ISSN de la revista
Título del volumen
Editor
Frontiers Media S.A.
Nombre de Curso
Licencia CC
CC BY 4.0
Licencia CC
Resumen
Fish are ectotherm organisms that move through different thermal zones according to their physiological requirements and environmental availability, a behavior known as thermoregulation. Thermoregulation in ectothermic animals is influenced by their ability to effectively respond to thermal variations. While it is known that ectotherms are affected by thermal changes, it remains unknown how physiological and/or metabolic traits are impacted by modifications in the thermal environment. In captivity (land-based infrastructures or nets located in the open sea), fish are often restricted to spatially constant temperature conditions within the containment unit and cannot choose among different thermal conditions for thermoregulation. In order to understand how spatial variation of temperature may affect fish welfare and stress, we designed an experiment using either restricted or wide thermal ranges, looking for changes at hormonal and molecular levels. Also, thermal variability impact on fish behavior was measured. Our results showed that in Atlantic salmon (Salmo salar), a wide thermal range (ΔT 6.8°C) was associated with significant increases in monoamines hormone levels and in the expression of clock genes. Aggressive and territoriality behavior decreased, positively affecting parameters linked to welfare, such as growth and fin damage. In contrast, a restricted thermal range (ΔT 1.4°C) showed the opposite pattern in all the analyzed parameters, therefore, having detrimental effects on welfare. In conclusion, our results highlight the key role of thermal range amplitude on fish behavior and on interactions with major metabolism-regulating processes, such as hormone performance and molecular regulatory mechanisms that have positive effects on the welfare. © Copyright © 2018 Sanhueza, Donoso, Aguilar, Farlora, Carnicero, Míguez, Tort, Valdes and Boltana.
Notas
Indexación Scopus
Palabras clave
Cortisol Receptors, Hydrocortisone, Sea Bream, Behavior, Confinement, Fish husbandry, HPI-axis, Thermoregulation
Citación
Frontiers in Endocrinology Volume 93 December 2018 Article number 717
DOI
10.3389/fendo.2018.00717