Energy metabolism of fish under cold shock
Date Issued
1999-07-31
Date
1999-07-31
Author(s)
郭欽明
DOI
882311B002013B28
Abstract
Tilapia, an economically important
cultured teleost in Taiwan, has played a
significant role in the fisheries development
in the past. As a tropical species, they are
suitable for culture in the warm waters.
However, mass mortality of these cultured
tilapia resulted from less tolerable attributes
of this species to the cold, has often caused
tremendous loss for the tilapia culture
industry, when the severe cold current
approaches in the winter season. This study is
therefore aimed to comprehend the
physiological responses of tilapias under the
cold shock.
The acclimated tilapias at 25 °C were
rapidly exposed to varying temperatures of
25 ℃ , 20 ℃, 15 ℃ and 10 ℃, and the
physiological responses were monitored
under various cold shocks. The parameters
monitored included temperature tolerance,
oxygen consumption, time-course changes in
plasma glucose and lactate. Remarkable
hyperglycemic responses were detected in
tilapias under the cold shock at 15 ℃, the
plasma glucose rapidly increased from 63.91
mg/dl to 132.04 mg/dl in 6 hr, about two-fold
increase over the original level. However, a
slight elevation in plasma glucose, from
41.74 mg/dl to 57.15 mg/dl in 1 hr, was
observed, when the tilapias were exposed
acutely to 10 ℃ . The hyperglycemic
response at this lethal temperature was found
less pronounced as compared to the previous.
The observations suggested that the tilapias
under 10 ℃ cold shock were unable to
perform physiological regulation and
compensation properly. The stress responses
and the exhaustion of regulatory capability
were indicated. With respect to the
lactocemic responses under 15 ℃ , the
plasma lactate concentration depressed
gradually from the initiation of cold shock treatment, decreased from 16.54±0.92 g/dl
down to 12.11±0.28 mg/dl in 24 hr. At the
extreme temperature of 10 ℃, the plasma
lactate maintained at the constant level for 30
min, followed by a notable depression down
to 9.47±2.24 mg/dl at the end of 1 hr, and
eventually physical exhaustion and death .
The changes in the oxygen consumption,
which is a reliable biological indicator for the
stress responses, was found highly correlated
with the temperatures employed and
sustained duration of cold shock.
Subjects
Tilapia
Physiological responses
Cold shock
Publisher
臺北市：國立臺灣大學漁業科學研究所
Type
journal article
File(s)![Thumbnail Image]()
Loading...
Name
882311B002013B28.pdf
Size
1.19 MB
Format
Adobe PDF
Checksum
(MD5):02332ad34a8e25ecaaef5c38ffb12c6f