# A Comparative Study of Two Different Polarity Extracts of Angelica sinensis on Growth, Body Composition, and Metabolism in Juvenile Carp

## TL;DR

This study compares the effects of two extracts from Angelica sinensis on the growth and metabolism of juvenile carp, finding that each extract influences body composition and digestion differently.

## Contribution

The study provides new insights into how different polarity extracts of Angelica sinensis affect fish metabolism and growth.

## Key findings

- Low polarity extract (LPE) reduced weight gain and lipid accumulation while increasing protein accumulation in carp.
- High polarity extract (HPE) enhanced weight gain, lipid accumulation, and protein digestion in carp.
- LPE and HPE had contrasting effects on enzyme activities and metabolic rates in digestive organs.

## Abstract

This study investigated the effects of low and high polarity extracts (LPE and HPE) of Angelica sinensis (AS) on growth, body composition, and metabolism in carp (Cyprinus carpio var. Jian). Over a 42‐day period, 780 fish were randomly separated into 13 groups with three replicate aquariums respectively. Thirteen groups received the feeding of basic diet, six LPE diets, and six HPE diets, respectively. The results indicated that dietary LPE decreased weight gain (WG), condition factor (CF), the activities of Na+, K+‐ATPase, γ‐glutamyl transpeptidase (γ‐GT), trypsin and lipase in digestive organs, plasma total amino acids (TAAs), triglyceride (TG) and ammonia levels, lipid productive value (LPV), and ammonia excretion rate (AER; p < 0.05), increased the activities of alkaline phosphatase (AKP), glutamate‐oxaloacetate transaminase (GOT), glutamate‐pyruvate transaminase (GPT), and α‐amylase in digestive organs, the content of total protein (TP) and glucose (GLU) in plasma, protein productive value (PPV), oxygen consumption rate (OCR), and O:N ratio in carp (p < 0.05). At the same time, dietary HPE increased WG, CF, the activities of lactate dehydrogenase (LDH), trypsin and lipase in digestive organs, the content of TP in plasma and LPV, PPV, OCR, and O:N ratio (p < 0.05) and decreased the activities of GOT and GPT in hepatopancreas as well as the content of ammonia, TAA, and GLU in plasma of carp (p < 0.05). According to the above findings, dietary LPE inhibits the growth and accumulation of body lipid and enhances the accumulation of body proteins by decreasing the digestion and absorption of lipids as well as amino acid catabolism, and increasing the catabolism of sugar and fat in fish. Dietary HPE enhances the growth and accumulation of body lipid and proteins by decreasing the catabolism of amino acid and increasing the digestion and absorption of proteins and lipids and the catabolism of sugar in fish.