ArticleScientific reports2015
Increased gastrointestinal blood flow: An essential circulatory modification for euryhaline rainbow trout (Oncorhynchus mykiss) migrating to sea.
Article in Scientific reports, 2015. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 10 papers.
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Who cites it
10 citing papers in PubMed.
- Importance of environmental signals for cardiac morphological development in Atlantic salmon.The Journal of experimental biology · 2024Article
- Increased reliance on coronary perfusion for cardiorespiratory performance in seawater-acclimated rainbow trout.The Journal of experimental biology · 2023Article
- The role of environmental salinity on NaScientific reports · 2022Article
- Continuous gastric saline perfusion elicits cardiovascular responses in freshwater rainbow trout (Oncorhynchus mykiss).Journal of comparative physiology. B, Biochemical, systemic, and environmental physiology · 2022Article
- Energetic savings and cardiovascular dynamics of a marine euryhaline fish (Myoxocephalus scorpius) in reduced salinity.Journal of comparative physiology. B, Biochemical, systemic, and environmental physiology · 2021Article
- Remote physiological monitoring provides unique insights on the cardiovascular performance and stress responses of freely swimming rainbow trout in aquaculture.Scientific reports · 2019Article
- Transcriptional analysis of renal dopamine-mediated NaBMC genomics · 2019Article
- Seawater acclimation affects cardiac output and adrenergic control of blood pressure in rainbow trout (Conservation physiology · 2018Article
- Exposure to seawater increases intestinal motility in euryhaline rainbow trout (The Journal of experimental biology · 2017Article
- Increased mitochondrial coupling and anaerobic capacity minimizes aerobic costs of trout in the sea.Scientific reports · 2017Article
Corrections and comments
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Authors and funding
6 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
The large-scale migrations of anadromous fish species from freshwater to seawater have long been considered particularly enigmatic, as this life history necessitates potentially energetically costly changes in behaviour and physiology. A significant knowledge gap concerns the integral role of cardiovascular responses, which directly link many of the well-documented adaptations (i.e. through oxygen delivery, water and ion transport) allowing fish to maintain osmotic homeostasis in the sea. Using long-term recordings of cardiorespiratory variables and a novel method for examining drinking dynamics, we show that euryhaline rainbow trout (Oncorhynchus mykiss) initiate drinking long before the surrounding environment reaches full seawater salinity (30-33 ppt), suggesting the presence of an external osmo-sensing mechanism. Onset of drinking was followed by a delayed, yet substantial increase in gastrointestinal blood flow through increased pulse volume exclusively, as heart rate remained unchanged. While seawater entry did not affect whole animal energy expenditure, enhanced gastrointestinal perfusion represents a mechanism crucial for ion and water absorption, as well as possibly increasing local gastrointestinal oxygen supply. Collectively, these modifications are essential for anadromous fish to maintain homeostasis at sea, whilst conserving cardiac and metabolic scope for activities directly contributing to fitness and reproductive success.
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