Effect of feeding level on feeding ecology of <i>Pelodiscus sinensis</i> cultured in rice field

WU Benli; HUANG Long; WU Cangcang; CHEN Jing; CHEN Xiajun; MEI Yaoping; HE Jixiang

doi:10.7671/j.issn.1001-411X.202405028

Journal of South China Agricultural University > 2024 > 45(6): 929-938. > DOI: 10.7671/j.issn.1001-411X.202405028

WU Benli, HUANG Long, WU Cangcang, et al. Effect of feeding level on feeding ecology of Pelodiscus sinensis cultured in rice field[J]. Journal of South China Agricultural University, 2024, 45(6): 929-938. DOI: 10.7671/j.issn.1001-411X.202405028

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Effect of feeding level on feeding ecology of Pelodiscus sinensis cultured in rice field

Anhui Key Laboratory of Aquaculture and Stock Enhancement/Fishery Institute, Anhui Academy of Agricultural Sciences, Hefei 230031, China

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Received Date: May 16, 2024
Available Online: September 22, 2024
Published Date: September 17, 2024

Graphical Abstract

Abstract

Abstract

Objective
The purpose of this study was to investigate the species and abundance of natural food for Chinese soft-shelled turtles (Pelodiscus sinensis) cultured in paddy fields under different feeding levels, explore the feeding ecology of P. sinensis in the rice-turtle co-culture mode, and provide a basis for optimizing the feeding strategy of comprehensive planting and breeding in rice fields and revealing the formation process and mechanism of ecological benefits.
Method
The field feeding experiment was conducted with three feeding levels of 0.7%, 1.4% and 2.1%(w) for studying rice-turtle co-culture. Morphological analysis of stomach contents and environmental DNA analysis were conducted to determine the feeding habit of the natural food and commercial feeds for P. sinensis in different treatment groups. The relative importance index of different foods in treatments was also analyzed.
Result
The feeding rate of P. sinensis increased with the increase of feeding level. In morphological analysis of stomach contents, 8 species of fish, 2 species of shrimp, 2 species of molluscs, 9 species of insects and rotifers were identified. The species with high occurrence rate included Abbottina rivularis, Pseudorasbora parva, Macrobrachium nipponense, Cipangopaludina chinensis, Polyarthra sp., Chironomidae larvae and Limnodrilus sp.. The occurrence rate and relative importance index proportion (IRIP) of commercial feeds increased with the increase of feeding level, while the IRIP of natural food decreased. The IRIP of commercial feeds was 91.97% when the feeding level was 2.1%, and the added IRIP of multiple natural foods was only 8.03%. In environmental DNA analysis, there were 16 species of fish with DNA relative abundance higher than 0.5%, and among them, A. rivularis, P. parva, Rhodeus sinensis, Hemiculter tchangi, Misgurnus anguillicaudatus, Paramisgurnus dabryanus, Carassius auratus and Hemisalanx brachyrostralis were also identified in morphology analysis of stomach contents. A total of 36 species of large aquatic vertebrates were identified, and the species with DNA relative abundance higher than 1.0% in stomach content samples mainly included Pseudochaeta sp. Janzen14, Palaemom modestus, Cipangopaludina chinensis, Chironomidae larvae, Limnodrilus sp., rotifer, etc.
Conclusion
The natural food of P. sinensis includes small fish, molluscs, arthropods and rotifers, etc. Higher feeding level of commercial feeds results in lower feeding rate and IRIP of natural food, which may reduce the ecological benefits of co-culture.
- Rice-turtle co-culture,
- Feeding level,
- Feeding ecology,
- Stomach content,
- Environmental DNA

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References (38)

References

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