Study on the fish communities from northern and southern waters of Taiwan by analyzing the impingement data

Abstract

為探討黑鯛(Acanthopagrus schlegeli)之日夜周期生理，本實驗利用體長8～9公分在自然光照飼育之黑鯛進行其呼吸耗氧量之日夜周期變化。實驗重複進行三次（10月30～31日兩組及10月31日～11月1日）每組均為三重複，每個實驗瓶各置一實驗魚，瓶塞有三孔分別為打氣及實驗樣水之出入口，每四小時採樣水100毫升測其溶氧濃度，並關閉瓶塞半小時後再取同量樣水測之，兩次讀數差作為該時段之耗氧指標，每次測定均同時記錄水溫。實驗結果顯示，同時記錄所得之水溫呈現少許之變化，但與光照之有無未呈現相關性；因此，本實驗僅以光照周期探討黑鯛日夜周期之耗氧量，顯示個體間耗氧量有差異，但均呈現規律之周期性，並均以14:00～18:00為主高峰(superior peak)，並於06:00呈現較不顯著之次峰(inferiorpeak)，此結果與黑鯛攝食周期性極為吻合。In order to draw a generalized frame for studying the circadian rhythm,oxygen consumption by black porgy(Acanthopagrus schlegeli)was measuredover a 32-hour period at four-hourly intervals.Each of the experiments(twoin Oct.30-31 and one in Oct.31-Nov.1,1989)had three replicated groups.ANOVA(Analysis of Variance)tests were analyzed the differences amongthe daily records.Water temperatures were recorded at the experimentperiods.The recorded temperatures did not indicate significantly concomitantchange with the oxygen consumption.The rates of the oxygen consumptionrevealed the cyclic trend with superior peak at 14:00-18:00 and an inferiorpeak at 06:00.For estimating the possible circadian rhythm of the blackporgy,the daily rates of oxygen consumption obtained in the present work,as well as the feeding rates and heart rates involved in the previous reportsare discussed.