일본뱀장어(Anguilla japonica) 야생성어의 산소소모율에 미치는 수온변화의 영향 KCI

Title
일본뱀장어(Anguilla japonica) 야생성어의 산소소모율에 미치는 수온변화의 영향
Alternative Title
Effects of Water Temperature Changes on the Oxygen Consumption Rhythm in the Japanese eel, Anguilla japonica
Author(s)
김종욱; 이태원; 노일; 김완수
Publication Year
2011-08
Abstract
We investigated the effects of temperature changes on the oxygen consumption rhythm in Japanese eels, Anguilla japonica, using an automatic intermittent flow respirometer (AIFR). The endogenous rhythm of the oxygen consumption rate (OCR) in the eels (n = 18; 44-74 cm, 145-690 g), freshly collected by bag net from estuaries, was nearly synchronous with the tidal pattern of the estuarine collection site. The magnitude of mean OCR (mOCR) of eels showed variable range of 82.2 - 116.5 ml O2kg−1wwh−1 under constant conditions. In case of increasing temperature from 25 to 38∘C , the OCR of eels exhibited a gradually increasing trend with a rhythmic pattern until 36∘C . Above 36∘C the rhythms of the OCR dampened and the OCR decreased rapidly at around 36−37∘C . The OCR of the eels exhibited the maximum value at 38∘C , and then it sharply decreased. The results suggested that the critical thermal maximum (CTM) regarding the endogenous rhythms of the eels was at around 36−37∘C when water temperature increased at 0.5∘C /14 h following the acclimation at 25∘C . In case of decreasing temperature ( 0.5∘C /14 h) from 25 to 0∘C , the OCR of the eels displayed a abrupt decrease up to 23∘C , and between at 23 and 20∘C , there was an agitation which showed a slight increase in the OCR with a duration of 1-2 days. Below 9∘C , the OCR rhythm of the eels showed a constant state regardless of temperature decreasing. These results suggest that the Japanese eel has an upper incipient lethal temperature at 36∘C , with a lower thermal limit at 9∘C . The biochemical aspects of the eels influenced by water temperature need to be further studied.
ISSN
1225-4517
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/3539
Bibliographic Citation
한국환경과학회지, v.20, no.8, pp.943 - 951, 2011
Publisher
한국환경과학회
Keywords
Japanese eel; Anguilla japonica; Oxygen consumption; Temperature; Critical thermal maximum; Rhythm
Type
Article
Language
English
Publisher
한국환경과학회
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