EFFECTS OF CURRENT VELOCITY ON DEVELOPMENT AND SURVIVAL OF LINGCOD, OPHIODON-ELONGATUS, EMBRYOS
EFFECTS OF CURRENT VELOCITY ON DEVELOPMENT AND SURVIVAL OF LINGCOD, OPHIODON-ELONGATUS, EMBRYOS
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DOI：
10.1007/bf00001659
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发表时间：
1984-01-01
影响因子：
1.4
通讯作者：
CONGLETON, JL
中科院分区：
文献类型：
--
作者：
GIORGI, AE;CONGLETON, JL
在野外和实验室条件下研究了流速对菱鳕鱼胚胎存活和发育的影响。检查在5 lingcod产卵场的卵块表明，胚胎死亡率高（高达95%），在低电流的网站，因为通风不足，导致缺氧。通风不良的卵块中心附近的胚胎发育相对于外围附近的胚胎发育迟缓。孵化的胚胎从通风不良的鸡蛋是旷日持久的，胚胎从内部的卵块孵化后，显着小于胚胎从鸡蛋附近的周边。在潮汐流期间，在低流速站点测量的卵块中的O2水平平均为16%的空气饱和度，对应于约73 h的中值耐受极限（LT 50）。在静水期间，在高流速地点测量的卵块中的O2水平平均为69%的空气饱和度，这一水平不会对胚胎产生不利影响。电流速度为10-15厘米s-1，需要保持在附近的环境水的卵块间隙O2水平。水运动可能是一个重要的刺激产卵场选择的lingcod。在潮流较弱的地区，产卵沉积发生在浅水中，波浪和垂直潮汐运动引起水流运动。在潮汐流强的地区，产卵一直沉积在较深的水域。
The influence of current velocity on the survival and development of lingcod embryos was investigated in the field and laboratory. Examination of egg masses at 5 lingcod spawning sites indicated that embryo mortalities were high (up to 95%) at low-current sites because of inadequate ventilation and resulting hypoxia. Development of embryos near the center of poorly ventilated egg masses was retarded relative to development of embryos near the periphery. Hatching of embryos from poorly ventilated eggs was protracted; embryos from the interior of egg masses hatched later and were significantly smaller than embryos from eggs near the periphery. O2 levels measured in egg masses at low-current velocity sites during tidal flow average 16% air saturation, corresponding to a median tolerance limit (LT50) of about 73 h. O2 levels measured in egg masses at high-current velocity sites during slack water average 69% air saturation, a level that did not adversely affect the embryos. Current velocities of 10-15 cm s-1 were needed to maintain interstitial O2 levels in egg masses near that of the ambient water. Water movement may be an important stimulus for spawning site selection by lingcod. In areas where tidal currents were weak, spawn deposition occurred in shallow water where waves and vertical tide motion created water movement. In areas where tidal currents were strong, spawns were consistently deposited in deeper water.