白鲢鳃部血管的研究

STUDIES ON THE GILLS VASCULATURE OF THE SILVER CARP

本文用甲基丙烯酸甲脂铸型技术,配合扫描电镜,研究白鲢鳃部血管的分布。鳃区具有双血液循环,动脉—动脉循环,主司血液与水体间气体交换;动脉—静脉循环主司鳃区营养交换。入鳃丝动脉上具有膨大的“血泡”结构,可能起“鳃心”作用,当鳃丝内收时将血液输送入入鳃动脉。伪鳃鳃小片彼此排列紧密,这种结构似不利于气体交换,可能没有什么呼吸功能。

The gills and pseudobranch vasculature of silver carp Hypophtkalmichthys molichix (Cu-vier a Valenciennes) have been studied by using the corrosion casting technique. Methyl me-thacrylate was chosen as the casting agent. The architecture of the blood vessels were observed under the microscope and scanning electron microscope.The blood vessels in the gills have two systems: aterioarterial system is adapted to respiration and arteriovenous system for nutrient exchange. There are blebs in the afferent gills filaments arteries near the terminal of interbranchial septum Fromm (1974) suggested that these blebs may serve as a branchial heart to pump the blood into the afferent artery during the adduction of the primary lamella.The pices of secondary lamellae of pseudobranch contact closely with each other, may not have respiratory function.