The scaled sardine's unique metabolic phenotype and its implications for the susceptibility of small tropical pelagic fishes to climate change.

Small pelagic fishes (e.g., sardines, anchovies and their relatives) are preyed upon by large predatory fishes, birds and mammals, and thus, are key species in marine food webs and with respect to ecosystem health and productivity.

Application of genomic tools to study and potentially improve the upper thermal tolerance of farmed Atlantic salmon (Salmo salar).

Background: The Atlantic salmon (Salmo salar) aquaculture industry must mitigate the impacts of rising ocean temperatures and the increased prevalence/severity of marine heat waves. Therefore, we investigated the genetic architecture and gene expression (transcriptomics) responsible for determining a salmon's upper thermal tolerance.

Results: A genome-wide association study (GWAS) was conducted using fin clips of salmon from a previous incremental thermal maximum (IT) challenge (n = 251) and the North American 50 K SNP chip.

Chronic hypoxia has differential effects on constitutive and antigen-stimulated immune function in Atlantic salmon ().

Chronic hypoxia events are a common occurrence in Atlantic salmon () sea-cages, especially during the summer, and their frequency and severity are predicted to increase with climate change. Although hypoxia is considered a very important fish health and welfare issue by the aquaculture industry, few studies have investigated the impact of chronic hypoxia on the fish immune system and its response to pathogen exposure. We exposed post-smolt Atlantic salmon to hypoxia (40% air sat.

It's a good thing that severely hypoxic salmon (Salmo salar) have a limited capacity to increase heart rate when warmed.

With climate change, fish are facing rising temperatures, an increase in the frequency and severity of heat waves and hypoxia, sometimes concurrently. However, only limited studies have examined the combined effects of increases in temperature and hypoxia on fish physiology and survival. We measured the cardiorespiratory physiology of 12°C-acclimated Atlantic salmon when exposed acutely to normoxia [100% air saturation (sat.

Effects of acute cooling and bradycardia on central venous pressure and cardiac function in Nile tilapia (Oreochromis niloticus).

We developed and validated a surgical technique to measure central venous pressure (CVP) in Nile tilapia, and investigated the effects of an acute temperature decrease (from 30 vs. 24 °C) and changes in heart rate (f) using zatebradine hydrocholoride, which decreases intrinsic f on this species' cardiac function. As predicted, f and cardiac output ( ) were ~ 40% lower in the acutely cooled fish, and both groups had very comparable (i.