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• W2000978919 endingPage "3675" @default.
• W2000978919 startingPage "3666" @default.
• W2000978919 abstract "SUMMARY At temperatures below 15°C the gill lamellae of goldfish (Carassius auratus) are largely covered by an interlamellar cell mass (ILCM) which decreases the functional surface area of the gill. The presence of the ILCM in goldfish acclimated to cold water conceivably could lead to a covering of the neuroepithelial cells (NECs), which are believed to be important for sensing ambient O2 and CO2 levels. In this study we tested the hypothesis that goldfish with covered lamellae (and presumably fewer NECs exposed to the water) exhibit a decreased capacity to hyperventilate in response to hypoxic stimuli. Measurements of ventilation amplitude and frequency were performed during exposure to acute hypoxia (PwO2=30 mmHg) or following injections of the O2 chemoreceptor stimulant NaCN into the buccal cavity or caudal vein of fish acclimated to 25°C (uncovered lamellae) or 7°C (covered lamellae) to stimulate predominantly the externally or internally oriented NECs, respectively. The results demonstrated no significant differences in the response to hypoxia, with each group exhibiting similar percentage increases in ventilation amplitude (90–91%) and frequency (34–43%). Similarly, with the exception of a rightward shift of the ventilation frequency dose–response in the fish acclimated to 7°C, there were no significant differences between the two groups of fish in the ED50 values. These findings suggest that goldfish with covered lamellae retain the capacity to sense external hypoxic stimuli. Using immunohistochemistry to identify serotonin-enriched NECs, it was demonstrated that the presence of the ILCM results in the NECs being redistributed towards the distal regions of the lamellae. In 25°C-acclimated fish, the NECs were distributed evenly along the length of the lamellae with 53±3% of them in the distal half, whereas in fish acclimated to 7°C, 83±5% of the NECs were confined to the distal half. Using the neuronal marker antibody ZN-12, it was demonstrated that the NECs at the distal edges of the lamellae are innervated by nerve fibres. Thus, it is hypothesised that the capacity to sense external hypoxic stimuli in goldfish acclimated to cold water is maintained despite the increasing coverage of the gill epithelial surfaces because of a redistribution of innervated NECs to the exposed distal regions of the lamellae." @default.
• W2000978919 created "2016-06-24" @default.
• W2000978919 creator A5028844049 @default.
• W2000978919 creator A5042843575 @default.
• W2000978919 date "2010-11-01" @default.
• W2000978919 modified "2023-09-26" @default.
• W2000978919 title "The control of breathing in goldfish (<i>Carassius auratus</i>) experiencing thermally induced gill remodelling" @default.
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• W2000978919 doi "https://doi.org/10.1242/jeb.047431" @default.
• W2000978919 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/20952614" @default.
• W2000978919 hasPublicationYear "2010" @default.
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