Post-prandial physiology and intestinal morphology of the Pacific hagfish (Eptatretus stoutii).

摘要: Hagfishes are unique to the vertebrate lineage in that they acquire dissolved nutrients across multiple epithelia including intestine, gill, and skin. This feat has been attributed their immersive feeding behavior likely simultaneously provides benefits (nutrient rich) potentially adverse (hypercapnia, hypoxia, high environmental ammonia) physiological effects. Examinations have conducted of ex vivo transport capabilities specific as well effects hypothesized environments, yet itself never elucidated. We examined post-prandial physiology Pacific hagfish (Eptatretus stoutii), identifying changes oxygen consumption, acid-base balance, ammonia waste excretion, intestinal morphology following captivity. Following voluntary feeding, consumption was significantly elevated (1868 ± 272 µmol kg-1 h-1) 8 h when compared control resting metabolic (642 ± 51 µmol kg-1 h-1) resulted a factorial scope 2.92. Changes status were not observed either excreted components or caudal blood samples; however, significant alkalosis post-feeding major vein. Significant increases (16-fold) excretion recorded 36 h post-fed hagfish. Finally, mucosal thickness microvilli length observed, with remaining increased throughout returning fasted lengths by 36 h. These results demonstrate earliest diverging extant craniate identify correlations between hindgut feeding.