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Table 8.

Effects of progressive increase in salinity from 0.7‰ to 20‰ on the concentrations of various free amino acids (FAAs) and total FAA (TFAA) in the muscle, liver and plasma ofH. signifer

Concentration (μmol g−1 wet mass tissue or mmol l−1 plasma)
Muscle
Liver
Plasma
FAAs0.7‰20‰0.7‰20‰0.7‰20‰
Alanine 2.05±0.51 1.80±0.35 0.72±0.16 0.40±0.09 0.12±0.01 0.13±0.009 
Arginine 0.28±0.05 0.14±0.05 0.02±0.001 0.06±0.03 0.09±0.01 0.08±0.01 
Asparagine 0.13±0.01 0.49±0.07* 0.29±0.03 0.22±0.04 0.009±0.004 0.007±0.0005 
Aspartate 0.26±0.10 0.26±0.06 0.05±0.008 0.12±0.03 0.03±0.003 0.04±0.005* 
β-alanine 2.84±0.93 9.09±0.64* 0.23±0.10 0.71±0.22 0.02±0.01 0.04±0.005 
Glutamine 0.46±0.03 0.96±0.08 1.09±0.09 2.15±0.35* 0.01±0.002 0.02±0.003 
Glutamate 0.84±0.26 1.68±0.35 0.10±0.02 0.25±0.08 0.09±0.006 0.16±0.02* 
Glycine 5.28±1.66 11.5±3.14 0.36±0.07 0.51±0.07 0.11±0.03 0.11±0.018 
Histamine 0.05±0.01 0.03±0.01 0.11±0.004 0.09±0.03 0.03±0.008 0.03±0.002 
Isoleucine 0.11±0.02 0.12±0.02 0.08±0.03 0.03±0.008 0.08±0.01 0.07±0.01 
Leucine 0.19±0.04 0.23±0.05 0.15±0.04 0.08±0.02 0.17±0.03 0.15±0.03 
Lysine 0.04±0.02 0.05±0.01 0.01±0.007 0.006±0.003 0.02±0.003 0.03±0.006 
Methionine 0.24±0.02 0.46±0.08* 0.30±0.05 0.32±0.07 0.13±0.02 0.18±0.03 
Phenylalanine 0.48±0.17 0.68±0.12 0.41±0.13 0.45±0.08 0.04±0.005 0.02±0.005* 
Proline 0.76±0.14 3.90±0.74* 0.56±0.20 1.72±0.12* 0.24±0.02 0.36±0.18 
Serine 0.70±0.12 0.46±0.08 0.10±0.02 0.09±0.02 0.07±0.01 0.07±0.007 
Taurine 26.0±1.75 26.0±2.46 17.6±2.97 17.5±2.93 1.43±0.48 0.58±0.10 
Threonine 0.39±0.16 0.22±0.05 0.26±0.07 0.16±0.02 0.08±0.01 0.06±0.002 
Tryptophan 0.06±0.02 0.07±0.007 0.04±0.02 0.01±0.005 0.04±0.009 0.06±0.004 
Tyrosine 0.03±0.007 0.09±0.01* 0.04±0.01 0.04±0.03 0.03±0.005 0.06±0.003* 
Valine 0.21±0.05 0.20±0.04 0.18±0.07 0.08±0.02 0.15±0.03 0.13±0.03 
TFAA 38.7±2.32 56.4±4.97* 22.6±3.15 24.7±3.98 2.97±0.39 2.90±0.35 
Concentration (μmol g−1 wet mass tissue or mmol l−1 plasma)
Muscle
Liver
Plasma
FAAs0.7‰20‰0.7‰20‰0.7‰20‰
Alanine 2.05±0.51 1.80±0.35 0.72±0.16 0.40±0.09 0.12±0.01 0.13±0.009 
Arginine 0.28±0.05 0.14±0.05 0.02±0.001 0.06±0.03 0.09±0.01 0.08±0.01 
Asparagine 0.13±0.01 0.49±0.07* 0.29±0.03 0.22±0.04 0.009±0.004 0.007±0.0005 
Aspartate 0.26±0.10 0.26±0.06 0.05±0.008 0.12±0.03 0.03±0.003 0.04±0.005* 
β-alanine 2.84±0.93 9.09±0.64* 0.23±0.10 0.71±0.22 0.02±0.01 0.04±0.005 
Glutamine 0.46±0.03 0.96±0.08 1.09±0.09 2.15±0.35* 0.01±0.002 0.02±0.003 
Glutamate 0.84±0.26 1.68±0.35 0.10±0.02 0.25±0.08 0.09±0.006 0.16±0.02* 
Glycine 5.28±1.66 11.5±3.14 0.36±0.07 0.51±0.07 0.11±0.03 0.11±0.018 
Histamine 0.05±0.01 0.03±0.01 0.11±0.004 0.09±0.03 0.03±0.008 0.03±0.002 
Isoleucine 0.11±0.02 0.12±0.02 0.08±0.03 0.03±0.008 0.08±0.01 0.07±0.01 
Leucine 0.19±0.04 0.23±0.05 0.15±0.04 0.08±0.02 0.17±0.03 0.15±0.03 
Lysine 0.04±0.02 0.05±0.01 0.01±0.007 0.006±0.003 0.02±0.003 0.03±0.006 
Methionine 0.24±0.02 0.46±0.08* 0.30±0.05 0.32±0.07 0.13±0.02 0.18±0.03 
Phenylalanine 0.48±0.17 0.68±0.12 0.41±0.13 0.45±0.08 0.04±0.005 0.02±0.005* 
Proline 0.76±0.14 3.90±0.74* 0.56±0.20 1.72±0.12* 0.24±0.02 0.36±0.18 
Serine 0.70±0.12 0.46±0.08 0.10±0.02 0.09±0.02 0.07±0.01 0.07±0.007 
Taurine 26.0±1.75 26.0±2.46 17.6±2.97 17.5±2.93 1.43±0.48 0.58±0.10 
Threonine 0.39±0.16 0.22±0.05 0.26±0.07 0.16±0.02 0.08±0.01 0.06±0.002 
Tryptophan 0.06±0.02 0.07±0.007 0.04±0.02 0.01±0.005 0.04±0.009 0.06±0.004 
Tyrosine 0.03±0.007 0.09±0.01* 0.04±0.01 0.04±0.03 0.03±0.005 0.06±0.003* 
Valine 0.21±0.05 0.20±0.04 0.18±0.07 0.08±0.02 0.15±0.03 0.13±0.03 
TFAA 38.7±2.32 56.4±4.97* 22.6±3.15 24.7±3.98 2.97±0.39 2.90±0.35 

Results represent means ± s.e.m. (N=4).

*

Significantly different from corresponding control condition at P<0.05.

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