水生生物学报2018，Vol.42Issue(3)：571-577,7.DOI:10.7541/2018.071
加速流对鲢、鳙幼鱼下行过程中游泳行为的影响
THE EFFECT OF ACCELERATING FLOW ON SWIMMING BEHAVIOR OF JUVENILE ARISTICHTHYS NOBILIS AND HYPOPHTHALMICHTHYS MOLITRIX DURING DOWNSTREAM MIGRATION
摘要
Abstract
Accelerating flow generally exists during fish downstream migration passage, which will affect swimming behavior of individual fish.In this study,the swimming behavior of juvenile silver carp(Hypophthalmichthys molitrix) and bighead carp(Aristichthys nobilis)during downstream migratory were tested under two types of accelerating flows (Ⅰ: 22—55 cm/s, Ⅱ: 25—60 cm/s). The objective of this experiment was to quantify the swimming behavior, includ-ing downstream pass rate, the way of downstream movement, and the time spent in each area. The preferred flow velo-city was measured by the percentage of residence time(Ft).The result showed that the fish performed two kinds of downstream behavior in accelerating flow, which were "direct" and "non-direct". The direct downstream rate of silver carp and bighead carp were 35.71% and 30% in Ⅰ, and 45.83% and 59.09% in Ⅱrespectively. During the non-direct downstream movement, silver carp spent significantly longer time in the flow less than 30 cm/s under both I and II flow conditions (P<0.05), which indicated that the preferred water velocity of silver carp in the tests was less than 30cm/s. The time spent by bighead carp was significant longer in the flow velocity less than 30 cm/s and 50—55 cm/s under flow conditionⅠ than in flow with other velocity (P<0.05), and under flow condition II, the time was longer in the flow velocity less than 30 cm/s (P<0.05), which implicated that the preferred water velocity of bighead carp in the test was less than 30 cm/s. Based on the results from two types of accelerating flow conditions, it showed that there was signifi-cant difference (P<0.05) in the residence time between silver carp and bighead carp in the flow with velocities less than 30 cm/s and 50—55 cm/s, but there was no significant difference (P>0.1) in medium and high velocity conditions. The study demonstrated that the accelerating flow can affect the swimming behavior of individual fish during downstream migration, and there is some interspecific difference in the ways of downstream migration and preferred velocity between silver carp and bighead carp.关键词
鲢/鳙/加速流/下行行为/偏好水流速度/种间差异Key words
Hypophthalmichehys molitrix/Aristichthys noblis/Accelerating flow/Behavior of downstream migration/Preferred water speed/Interspecific分类
生物科学引用本文复制引用
李敏讷,朱海峰,金志军,罗佳,许家炜,李志敏,马卫忠,石小涛..加速流对鲢、鳙幼鱼下行过程中游泳行为的影响[J].水生生物学报,2018,42(3):571-577,7.基金项目
国家自然科学基金(51579136) （51579136）
中国电力建设股份有限公司科技项目(DJ-ZDXM-2014-04)资助[Supported by the National Natural Science Foundation of China(51579136) （DJ-ZDXM-2014-04）
China Power Construction Co.,Ltd Science and Technology Project(DJ-ZDXM-2014-04)] （DJ-ZDXM-2014-04）
