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AB 29:165-173 (2020)  -  DOI:

High hydrostatic pressure effects on arginine vasotocin levels in fish

Arnau Rodríguez-Illamola1,2,*, Jesús M. Míguez1, João Coimbra3, Jonathan M. Wilson3,4

1Laboratory of Animal Physiology, Department of Functional Biology and Health Sciences, Faculty of Biology, University of Vigo, 36310 Vigo, Spain
2Laboratory of Fish Reproduction, Faculty of Fisheries and Protection of Waters, South Bohemian Research Center of Aquaculture and Biodiversity of Hydrocenoses, University of South Bohemia in České Budéjovice, Zátiší 728/II, 389 25 Vodňany, Czech Republic
3Laboratory of Ecophysiology, Centro Interdisciplinar de Investigação Marinha e Ambiental (CIIMAR), 4450-208 Matosinhos, Portugal
4Present address: Department of Biology, Wilfrid Laurier University, 75 University Ave W, Waterloo, ON N2L 3C5, Canada
*Corresponding author:

ABSTRACT: The present study investigates the response of the hormone arginine vasotocin (AVT), the non-mammalian antidiuretic hormone, to the acclimation of fish to high hydrostatic pressure (5.1 MPa). Two fish species with different osmoregulatory strategies, the lesser spotted dogfish Scyliorhinus canicula, a marine osmoconforming chondrichthyan species adapted for migration to deep waters, and the rainbow trout Oncorhynchus mykiss, a pressure-sensitive freshwater species, were selected for study. Fish were exposed to hydrostatic pressures of either 0.1 (control) or 5.1 MPa in hydrostatic chambers for up to 2 wk at their appropriate salinities. Plasma cortisol was measured in trout, and plasma chloride, sodium and potassium were measured in both fish species. A transient high level of plasma AVT was found in dogfish and in trout after 1 and 3 d of exposure to high hydrostatic pressure, which returned to basal levels by 14 d of exposure. In contrast, pituitary AVT content was reduced after short-term exposure in dogfish, while in trout, lower expression was found in high pressure than in control conditions, independently of exposure time. In dogfish, pituitary AVT levels recovered by 14 d under high hydrostatic pressure. No changes in plasma cortisol (trout) or ions (both species) were observed. These initial increases of the AVT release from the pituitary during fish acclimation to high pressure suggest that it works as a physiological short-term response to reduce water loss and equilibrate ion osmotic balance.

KEY WORDS: Fish · Acclimation · Hydrostatic pressure ·Arginine vasotocin · Rainbow trout · Dogfish

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Cite this article as: Rodríguez-Illamola A, Míguez JM, Coimbra J, Wilson JM (2020) High hydrostatic pressure effects on arginine vasotocin levels in fish. Aquat Biol 29:165-173.

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