Daily variation in the shoaling behavior of zebrafish Danio rerio

作     者：Paciorek, Timothy Mcrobert, Scott 

作者机构：Department of Biology Saint Joseph’s University Philadelphia PA 19131 USA 

出 版 物：《Current Zoology》 (动物学报（英文版）)

年 卷 期：2012年第58卷第1期

页      面：129-137页

核心收录：

学科分类：0710[理学-生物学] 083002[工学-环境工程] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 07[理学] 0905[农学-畜牧学] 0707[理学-海洋科学] 08[工学] 0906[农学-兽医学] 09[农学] 0903[农学-农业资源与环境] 0713[理学-生态学] 

基　　金：biology graduate program Saint Joseph's University chapter of Sigma Xi 

主　　题：Shoaling behavior Zebrafish Danio rerio 

摘      要：Shoaling behavior provides numerous fitness benefits for fish, including enhanced access to mates, increased success in foraging and protection from predators. We were interested in determining whether shoaling intensity differed throughout the day. To do this we kept adult zebrafish Danio rerio in different lighting conditions for 10 days： ＂Normal＂ （12：12LD, lights on at 0800 hrs）, ＂Reverse＂ （12：12LD, lights on at 2000 hrs）, DD, or LL, and then observed the shoaling behavior at different times during the day. Our findings suggest that daily variations exist in shoaling behavior, with mean shoaling times for fish from the ＇normal＇ group being the lowest at the mid-point of the dark phase in the fish＇s subjective day （00：00 hrs）, then rising signifi- cantly throughout the day, reaching their highest intensity at 20：00 hrs （lights out）. Fish from the ＂reverse＂ LD cycle （lights on at 20：00 hrs） showed differences in the mean shoaling times at different times of day, but did not show a gradual increase in shoaling throughout their subjective day. Fish from the DD and LL groups did not show significant differences in the mean shoaling values at different times of day, suggesting that the differences observed in LD fish may not represent circadian rhythms. Therefore, these results demonstrate the existence of daily variations in the shoaling behavior of fish and suggest that environmental cues in the form of light/dark cycles play an important role in regulating these variations [Current Zoology 58 （1）： 129-137, 2012].