Screening of enzyme activity for assessing the condition of larvae in the seven-band grouper <Emphasis Type="Italic">Epinephelus septemfasciatus</Emphasis> and devil stinger <Emphasis Type="Italic">Inimicus japonicus</Emphasis> |
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Authors: | Yaowalux Ruttanapornvareesakul Yoshitaka Sakakura Atsushi Hagiwara |
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Institution: | (1) Nagasaki Industrial Promotion Foundation, 1-14 Bunkyo, Nagasaki 852-8521, Japan;(2) Faculty of Fisheries, Nagasaki University, 1-14 Bunkyo, Nagasaki 852-8521, Japan;(3) Graduate School of Science and Technology, Nagasaki University, 1-14 Bunkyo, Nagasaki 852-8521, Japan; |
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Abstract: | We conducted screening tests to determine whether enzyme activity is a suitable biomarker for assessing the physiological
condition of marine fish larvae. The rearing experiments consisted of three trials, of which two were conducted using the
seven-band grouper Epinephelus septemfasciatus for a period of 5 days after hatching (DAH), and one was conducted using the devil stinger Inimicus japonicus for 10 DAH. The trials were conducted under three different rearing-tank environments (shallow tank, intermediate tank, deep
tank) in a water volume of 100 l and an aeration rate of 50 ml/min. We determined survival, surface death, growth, and enzyme
activities (trypsin, esterase, and alkaline phosphatase). The highest survival rates and lowest surface deaths in both species
occurred among the larvae grown in the deep tank. There was a significant and negative correlation between survival at 5 DAH
and alkaline phosphatase activity at 0 DAH in the seven-band grouper. The same correlation was found between survival at 10 DAH
and trypsin and alkaline phosphatase activity at 1 DAH in the devil stinger. Based on these results, we conclude that the
activity of a specific enzyme is a candidate for assessing the physiological condition of marine fish larvae. |
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