Effects of dietary n‐3 long‐chain unsaturated fatty acid on growth performance, lipid deposition, hepatic fatty acid composition and health‐related serum enzyme activity of juvenile Japanese seabass Lateolabrax japonicus
2017
Xu, H. | Du, J. | Li, S. | Mai, K. | Xu, W. | Ai, Q.
Studies were conducted to investigate the effects of dietary n‐3 long‐chain polyunsaturated fatty acid (n‐3 LC‐PUFA) on growth performance, lipid deposition, hepatic fatty acid composition and serum enzyme activities of juvenile Japanese seabass Lateolabrax japonicus (initial mean weight 29.2 ± 1.34 g). Triplicate groups of 30 Japanese seabass were fed with six diets containing grade levels of n‐3 LC‐PUFA (1.30, 2.98, 5.64, 10.31, 14.51, 24.13 g kg–¹ of dry weight) to apparent satiation twice daily for 9 weeks. The specific growth rate (SGR) was the highest in 10.31 g kg–¹ dietary n‐3 LC‐PUFA group. Crude lipid content of the fish decreased significantly with increasing dietary n‐3 LC‐PUFA. Meanwhile, the hepatic lipid content increased significantly in the 24.13 g kg–¹ group. Hepatic n‐3 LC‐PUFA content of total fatty acids was closely correlated with that in diet. No significant difference was observed in serum alanine transaminase (ALT) and aspartate aminotransferase (AST) activities. Moderate n‐3 LC‐PUFA level (10.31 g kg–¹ of dry weight) in the diet was beneficial to enhance the activity of lysozyme in serum. Based on SGR, the optimum dietary n‐3 LC‐PUFA content was estimated to be around 10.94 g kg–¹ of dry weight by second‐order polynomial regression method.
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