Increased Thermal Challenges Differentially Modulate Neural Plasticity and Stress Responses in Post-Smolt Atlantic Salmon (Salmo salar)
نویسندگان
چکیده
The successful transfer of farmed post-smolt Atlantic salmon (Salmo salar) depends on proper stress responses and cognitive functions during the early seawater (SW) phase. However, with increasing summer oceanic temperatures, these processes may become a challenge, implicating allostasis welfare. Therefore, we examined effect from 10°C SW to elevated temperatures (13°C, 16°C, 18°C) plasma cortisol telencephalic genes modulating cognition ( neurod, bdnf, pcna , c-fos ) stress-axis regulation crf, crfbp, mr, gr1, gr2 hsd11b2 ). Fish were sampled at i) 1 day following transfer, ii) 45 days acclimation, iii) h after an acute challenge test (ACT) using confinement stress. transferred 13°C retained responses, elevating levels cortisol, gr2, bdnf maintaining neurod . Contrastingly, although increased reverted inhibition crfbp gr1 complemented dampened responses. transferring post-smolts 18°C showed most adverse effects, having absent (cortisol ), suppression downregulation implies low in line modulations corticosteroid receptors These results suggest that 16°C inhibits normal reactive response post-smolts. Following acclimation (45 days), basal for all groups; however, maintained key regulatory crf mr alongside lower mr/gr1 ratio, indicator chronic allostatic load. Moreover, neural plasticity was suppressed 18°C, suggesting impacts loads potentially inferior capacities. Despite similar ACTs, activation stress, implying greater challenges, group also level In summary, telencephalon shows continue struggle thermal even which is not revealed by levels, grounding importance measures identifying environmental thresholds hidden challenges.
منابع مشابه
Cardiorespiratory modifications, and limitations, in post-smolt growth hormone transgenic Atlantic salmon Salmo salar.
In recent years, there has been a great deal of interest in how growth hormone (GH) transgenesis affects fish physiology. However, the results of these studies are often difficult to interpret because the transgenic and non-transgenic fish had very different environmental/rearing histories. This study used a stable line of size-matched GH Atlantic salmon (Salmo salar) that were reared in a shar...
متن کاملAtlantic salmon – Salmo salar
Distribution Th e species’ range encompasses Europe, North America, and Green land (1) (Fig.1). Non-anadromous forms occur in Europe in a few land-locked locations in Norway and Sweden, and throughout the Neva/Lake Ladoga system and Karelia regions of Russia. In North America non-anadromous forms occurred throughout most of the species’ historical range, as far west as Lake Ontario, and remain ...
متن کاملFast water currents reduce production performance of post-smolt Atlantic salmon Salmo salar
In the future, an increasing number of salmon farms may be located in areas with fast water current velocity due to limited availability of more sheltered locations. However, there is little information as to how fast currents affect fish health and welfare. We used raceways to expose Atlantic salmon post-smolts (98.6 g, 22.3 cm) to homogeneous water velocities corresponding to 0.2, 0.8 and 1.5...
متن کاملImmunoglobulin Isotypes in Atlantic Salmon, Salmo Salar
There are three major immunoglobulin (Ig) isotypes in salmonid fish: IgM, IgD and IgT, defined by the heavy chains μ, δ and τ, respectively. As a result of whole genome duplication in the ancestor of the salmonid fish family, Atlantic salmon (Salmo salar) possess two highly similar Ig heavy chain gene complexes (A and B), comprising two μ genes, two δ genes, three intact τ genes and five τ pseu...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Frontiers in Marine Science
سال: 2022
ISSN: ['2296-7745']
DOI: https://doi.org/10.3389/fmars.2022.926136