Which physiological challenge increases for freshwater fish adapted to rapid salinity increases?

💡 Explanation

Sudden salinity increase inhibits active transport because the external concentration exceeds internal osmotic pressure disrupting efficient ion uptake at the gills, a form of osmoregulation. Therefore reduced active salt uptake occurs, rather than increased influx, suppressed excretion, or altered thermoregulation which involve different regulatory processes.

• Which restriction follows from photorespiration occuring due to high oxygen?
• Which consequence results from excessive venom dosage during envenomation?
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