Abstract:
A macrourid, Coryphaenoides yaquinae sp. inc., was observed to be attracted to bait and exhibiting normal foraging behaviour during a period of 80 min within view of a baited video camera on the sea floor at 7259 m - the deepest ever observation of a fish species with a swim bladder. The buoyancy provided by an oxygen-filled swim bladder at 74.4 MPa pressure was estimated to be 0.164 N, at a theoretical energy cost of 20 kJ, 200 times less than the cost of equivalent lipid buoyancy. During normal metabolism, 192 days would be required to fill the swimbladder. At these depths, oxygen is very incompressible, so changes in volume during ascent or descent are small. However, swimbladder function is crucially dependent on a very low rate of diffusion of oxygen across the swimbladder wall. The oxygen in the swimbladder could theoretically sustain aerobic metabolism for over 1 year but is unlikely to be used as a reserve.
摘要:
一种巨脲,黄连。inc.在7259m的海底诱饵摄像机的视野下,观察到诱饵被诱饵吸引并在80分钟内表现出正常的觅食行为;有史以来对带有游泳膀胱的鱼类的最深观察。充氧的游泳膀胱在74.4MPa压力下提供的浮力估计为0.164N,在20千焦的理论能源成本下,200倍小于等效脂质浮力的费用。在正常代谢过程中,需要192天才能充满游泳膀胱。在这些深度,氧气是非常不可压缩的,因此上升或下降过程中的体积变化很小。然而,游泳膀胱的功能主要取决于非常低的氧气在游泳膀胱壁上的扩散速率。理论上,游泳囊中的氧气可以维持有氧代谢超过一年,但不太可能用作储备。