Response of Electrocardiogram of Nile tilapia, Oreochromis niloticus to Light Stimuli

The authors examined the response of electrocardiogram(ECG) of Nile tilapia, Oreochromis niloticus [Linnaeus] to light stimuli. The experiments were performed in such a way that three levels of light stimuli(10, 100 and 400 lu$\chi$) were given to fishes with an electrode inserted into their bodies and then their ECGs were recorded continuously for 60 minutes in 16~18$^{\circ}C$. The results which are divided into by day and by night and then analyzed by fishes' conditions are as follows; 1. Nile tilapias reached a stable condition 3 minutes after anesthesia. In stable condition, the heart rate average was 47.6beat/min by day and 45.1beat/min by night. And the action potential average was 1.0.4$mutextrm{V}$ by day and 1.24$mutextrm{V}$ by night. 2. The heart rate average by three levels of light stimuli was, \circled1 In stimulus condition, in case of 10 lu$\chi$ 39.7beat/min by day and 38.2beat/min by night, in case of 100 lu $\chi$8.7beat/min by day and 36.9beat/min by night, and in case of 40.0. lux 36.8 beat/min by day and 35.8beat/min by night. \circled2 In recovery condition, in case of 10 lu$\chi$ 47.1beat/min by day and 46.0beat/min by night, in case of 100 lu$\chi$ 47.2beat/min by day and 45.6 beat/min by night, and in case of 400 lu$\chi$ 48.1beat/min by day and 46.6beat/min by night. 3. The action potential average by three levels of light stimuli was, \circled1 In stimulus condition, in case of 10 lu$\chi$ 1.22$mutextrm{V}$ by day and 0.71$mutextrm{V}$ by night, in case of 100 lu$\chi$ 0..63$mutextrm{V}$ by day and 0.90$mutextrm{V}$ by night, and in case of 400 lu$\chi$ 1.39$mutextrm{V}$ by day and 1.63$mutextrm{V}$ by night \circled2 In recovery condition, in case of 10 lu$\chi$ 1.26$mutextrm{V}$ by day and 1.59$mutextrm{V}$ by night, in case of 100 lu$\chi$ 2.63$mutextrm{V}$ by day and 3.65$mutextrm{V}$ by night, and in case of 400. lu$\chi$ 2.52$mutextrm{V}$ by day and 3.67$mutextrm{V}$ by night.

광자극에 대한 역돔의 심전도

광자극에 대한 역돔, Oreochromis niloticus[Linnaeus]의 심전도를 구명하기 위하여 16~18$^{\circ}C$ 수온에서 어체내에 전극을 삽입하여 3가지 광자극 (10, 100, 400 lu$\chi$)에 대한 심전도를 서간과 야간으로 구분하여 60분간 연속적으로 조사한 심전도를 상태별로 분석한 심박수와 생체전위는 다음과 같다. 1. 역돔은 마취 후 3분 뒤에 안정상태에 도달하였고, 안정상태에서 평균심박수는 서간에 47.6 beat/min, 야간에 45.1 beat/min였고, 평균생체 전위는 서간에 1.04 $\mu\textrm{V}$, 야간에 1.24 $\mu\textrm{V}$로 나타났다. 2 자극별 평균심박수는 \circled1 자극상태에서, 10 lu$\chi$인 경우 서간에 39.7 beat/min, 야간에 38.2 beat/min였고, 100 lu$\chi$인 경우 서간에 38.7 beat/min, 야간에 36.9 beat/min였으며, 400 lu$\chi$인 경우 서간에 36.8 beat/min, 야간에 35.8 beat/min로 나타났고, \circled2 회복상태에서, 10 lu$\chi$인 경우 서간에 47.1 beat/min, 야간에 46.0 beat/min였고, 100 lu$\chi$인 경우 서간에 47.2 beat/min, 야간에 45.6 beat/min였으며, 400 lu$\chi$인 경우 서간에 48.1 beat/min, 야간에 46.6 beat/min로 나타났다. 3. 자극별 평균생체전위는 \circled1 자극상태에서, 10 lu$\chi$인 경우 서간에 1.22 $\mu\textrm{V}$, 야간에 0.71$\mu\textrm{V}$였고, 100 lu$\chi$인 경우 서간에 0.63 $\mu\textrm{V}$, 야간에 0.90 $\mu\textrm{V}$였으며, 400 lu$\chi$ 인 경우 서간에 1.39 $\mu\textrm{V}$, 야간에 1.63 $\mu\textrm{V}$로 나타났고, \circled2 회복상태에서, 10 lu$\chi$인 경우 서간에 1.26 $\mu\textrm{V}$, 야간에 1.59 $\mu\textrm{V}$였고, 100 lu$\chi$인 경우 서간에 2.63 $\mu\textrm{V}$ 야간에 3.65 $\mu\textrm{V}$였으며, 400 lu$\chi$인 경우 서간에 2.52 $\mu\textrm{V}$, 야간에 3.67 $\mu\textrm{V}$로 나타났다.