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Effects of different fasting durations on growth characteristics and

nutrient composition of edible parts in Scylla paramamosain

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JIANG Yang , CHEN Enzhu , JIN Runze , JI Xinping , WANG Chunlin , WU Qingyang 1,2*
1. School of Marine Sciences, Ningbo University, Ningbo 315832, China;
2. Research Academy of Sanmen Mud Crab Industrial Technology, Taizhou 317100, China
Abstract: Fasting or starvation is a common method used in the cultivation of mud crabs (Scylla paramamosain) to regulate
their substance and energy metabolism, achieve efficient wintering, and promote off-season sales. To explore the effects of fast-
ing duration under low-temperature conditions on the growth and nutritional composition of S. paramamosain, a group of first-
year female S. paramamosain were subjected to a fasting experiment at a water temperature of (14±1) ℃. Samples were taken
at 0, 2, 14, and 60 days of fasting to compare and analyze the impact of fasting duration on the nutritional composition of the
edible parts (muscle and hepatopancreas) of the S. paramamosain. The results showed that, ① under low-temperature condi-
tions, fasting didn’t lead to crab mortality and had no significant impact on weight, carapace length, width, and height.
However, the hepatosomatic index and condition factor gradually decreased with increasing fasting duration (P<0.05). ② Fast-
ing didn’t significantly affect the conventional nutritional components of the muscle, but the crude lipid content in the hepato-
pancreas decreased significantly with fasting duration, while the moisture, crude protein, and ash content increased (P<0.05).
③ In terms of amino acid composition, 17 amino acids were detected in both the muscle and hepatopancreas. Except for slight
changes in the proportion of individual amino acids, the proportions of most amino acids remained stable. ④ During fasting,
the S. paramamosain notably retained a high level of unsaturated fatty acids, such as 20:4n6 (ARA) and 20:5n3 (EPA), while
the retention level of 22:6n3 (DHA) was low. C16:0 and C16:1n were the main energy-providing substances. The results sug-
gest that fasting significantly alters the nutritional composition of the hepatopancreas compared to muscle tissue, possibly by
inducing the metabolism of fatty acids, particularly SFA, to provide sufficient energy. This indicates the vital role of SFA in the
wintering of S. paramamosain, and supplementation before wintering may promote more efficient wintering, while post-winter-
ing fat storage may require enhanced SFA nutritional supply. The study enriches our knowledge of energy and nutritional meta-
bolism in S. paramamosain and provides a preliminary research foundation and theoretical basis for further studies on precise
and efficient wintering and post-wintering fattening of S. paramamosain.
Key words: Scylla paramamosain; fasting; amino acids; fatty acids

Corresponding author: WU Qingyang. E-mail: wuqingyang@nbu.edu.cn
Funding projects: Key Scientific and Technological Grant of Zhejiang for Breeding New Agricultural Varieties (2021C02069-6)

中国水产学会主办 sponsored by China Society of Fisheries https://www.china-fishery.cn
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