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5 sty 2015 · The histological changes of swimbladder tissue of different eel species observed during the preparation of the spawning migration support the conclusion that the swimbladder is of major importance for the journey of the European eel to the Sargasso Sea.
Eels develop pronounced bradycardia upon air exposure. 5. After 20 hr in air at 15°C eels have accumulated a substantial oxygen debt and the concentration of H + -ions and lactic acid in their blood is elevated for about 1 hr after return of the animal to water. At 7°C these reactions are almost absent. 6.
1 sty 1970 · Structural adaptations for air breathing in fishes are extremely diverse. The extent of modifications from structures typical of an aquatic breather usually reflects the relative role of air breathing in overall gas exchange.
The electric eel Electrophorus electricus is an obligate air breather. Its mouth is structurally adapted for air breathing by an extensively diverticulated and richly vascularized oral mucosa. Air is regularly taken into the mouth and later expelled at the opercular openings.
Respiration - Electric Eel. Electric Eels are mouth-breathers and will drown if denied access to air. The oral cavity is highly vascularized and folded to increase surface area, allowing for gas exchange. Air is taken in every few seconds to every few minutes.
The autonomic control of the heart during water- and air-breathing was revealed by infusion of the β-adrenergic antagonist propranolol and muscarinic antagonist atropine (3 mgkg (-1)) in eels instrumented with an arterial catheter.
but Asian swamp eel is a unique air breathing fish as they showed a significantly extended tolerance to survive in the wet muddy areas up to seven months without even food and water.
