Author:
Kuramoto Taketeru,Tani Masaki
Abstract
Contractile and metabolic activities of the isolated heart of
Panulirus japonicus were recorded while thermal and
hormonal stimuli were applied for 3–6 min. The heart beat was often
augmented in amplitude with a fall in temperature from 20° to
17–15°C. With the augmented beat, a decrease of
pO2 in the ventricle indicated an
increase in oxygen consumption rate of the heart. When serotonin (0.1
µM) and the cold stimulation were applied at the
same time, pO2 in the ventricle
decreased, suggesting that the metabolic rate of the heart markedly rose. In
contrast, octopamine (1 µM) raised the oxygen
consumption rate of the heart only slightly. Octopamine greatly enhanced the
membrane excitability and contraction force of the heart during cold
treatment. A transient period of cooling in vivo may
cause the pericardial organs to release octopamine and serotonin in
P. japonicus. This may be relevant to the care of spiny
lobsters during mariculture, capture, handling and transport.
Subject
Ecology,Aquatic Science,Ecology, Evolution, Behavior and Systematics,Oceanography
Cited by
2 articles.
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