Page 59 - 《渔业研究》2026年第3期

352 渔 业 研 究 第 48 卷

Effects of inulin on the growth performance, digestive enzyme activity,
metabolic function and non-specific immunity of
juvenile Siniperca scherzeri

LIU Yinhua，QIN Zhiqing，WANG Xinxin，TIAN Tian
(Freshwater Fisheries Research Institute of Fujian, Fuzhou 350002, China)

Abstract: [Objective] The aim of this experiment was to investigate the effects of inulin on the growth per-
formance, digestive enzyme activity, metabolic function and non-specific immunity of juvenile Siniperca
scherzeri. [Methods] A total of 360 juvenile S. scherzeri with initial body mass (IBM) of (7.40 ± 0.07) g were
selected and randomly divided into 4 groups with 3 replicates per group and 30 fish per replicate. Using crushed
expanded feed for mandarin fish as the experimental basal diet, four types of diets were prepared with inulin ad-
dition levels of 0% (control group, L1), 0.5% (L2), 1.0% (L3), and 1.5% (L4), respectively. The experiment las-
ted for 60 days. [Results] 1) The optimal growth performance of juvenile S. scherzeri was observed with an in-
ulin addition level of 0.5%. At this level, final body mass (FBM), weight gain rate (WGR), and specific growth
rate (SGR) significantly increased (P<0.05), while feed conversion ratio (FCR) significantly decreased
(P<0.05). 2) The intestinal digestive enzyme activity of juvenile S. scherzeri was improved at a dietary inulin
level of 0.5%. The intestinal amylase (AMS) activity was significantly increased compared with the control
group (P<0.05), the intestinal lipase (LPS) and intestinal trypsin (TPS) activities were increased compared with
the control group (P>0.05). 3) Adding inulin to feed could promote the serum lipid metabolism in juvenile
S. scherzeri. The setum triglyceride (TG) content significantly decreased at a dietary inulin level of 1.5%, the
serum cholesterol (CHO) and low-density lipoprotein cholesterol (LDL-C) levels at a dietary inulin level of
0.5% were significantly reduced compared with control group, the serum high-density lipoprotein cholesterol
(HDL-C) content at a dietary inulin level of 1.0%−1.5% was significantly increased compared with control
group. 4) Juvenile S. scherzeri showed the highest protein metabilism at a dietary inulin level of 0.5%. At this
level, The alanine aminotransferase (ALT) and aspartate aminotransferase (AST) activities significantly de-
creased. 5) Adding inulin to feed can promote the non-specific immunity in juvenile S. scherzeri. The serum
malondialdehyde (MDA) content of L2, L3 and L4 were significantly lower than that of the control group
(P<0.05). The serum alkaline phosphatase (ALP) and acid phosphatase (ACP) activities significantly increased
at a dietary inulin level of 0.5% (P<0.05). At this level, the activity of superoxide dismutase (SOD) was also
higher than that of control group (P>0.05). [Conclusions] Under the conditions of this experiment, adding ap-
propriate amounts of inulin to feed can promote the growth, digestion, metabolism and immunity of juvenile
Siniperca scherzeri, and 0.5% inulin supplementation has a better effect.
Key words: Siniperca scherzeri; inulin; growth performance; digestive enzyme activity; metabolic function;
non-specific immunity