中华绒螯蟹蜕皮过程中肌肉、肝胰脏和甲壳中钙和磷含量的变动

Calcium and phosphorus levels in the muscle, hepatopancreas and carapace of Eriocheir sinensis in different stages of moulting cycle

对中华绒螯蟹蜕皮间期和蜕皮后24h、48h和96h肌肉、肝胰脏及甲壳中钙和磷的含量进行了测定。蜕皮后肌肉中钙的含量较间期低,但从24h到48h有所增加。肝胰脏中钙的含量在蜕皮后各时间内无显著变化,甲壳中钙的含量在蜕皮后24h到96h呈增加趋势。甲壳的矿化作用在蜕皮后96h已接近完成。蜕皮后肌肉中磷的含量较间期高,以后变化不明显。蜕皮后肝胰脏中磷的含量高于间期,甲壳中含量较间期低。蜕皮后肌肉中钙磷比迅速降低,肝胰脏中钙磷比在蜕皮后24h无明显变化,但在蜕皮后24h至96h迅速降低。中华绒螯蟹蜕皮后外表皮对钙的矿化速度显著快于磷的矿化速度。

The levels of calcium and phosphorus in the muscles ,hepatopancreas,carapace and cast exuviae of Chinese mitten crab, Eriocheir sinensis, were determined during the intermoult and 24h,48h and 96h of postmoult respectively. The concentrations of calcium in the muscle in postmoult were lower than that of intermoult, but showed slight increase from 24h to 48h in postmoult. No significant changes of calcium levels were found in the hepatopancreas while the levels of calcium in the carapace increased from 24h to 96h in postmoult. The calcification of the carapace was almost finished after 96h of moulting. The levels of muscle phosphorus in postmoult were higher than that of intermoult, but there were no changes in the later times. The content of phosphorus increased in the hepatopancreas and decreased in the carapace in postmoult stages. The muscle calcium and phosphorus ratio decreased sharply in postmoult as compared with that of the intermoult, while it showed no changes in intermoult and 24 h of postmoult in hepatopancreas, but decreased from 24 h to 96 h of postmoult. The carapace calcium and phosphorus ratio was low in intermoult and 24 h of postmoult, but increased from 24 h of postmoult to 96 h. The carapace mineralization rates of calcium of Chinese mitten crab were found faster than that of phosphorus.