The sexual dimorphism and feeding ecology of Perccottus glenii in the Mudanjiang River

doi:10.14088/j.cnki.issn0439-8114.2026.01.021

Abstract

Abstract: To explore the sexual dimorphism patterns and food resource utilization characteristics of Perccottus glenii, a total of 68 Perccottus glenii specimens (32 females and 36 males) were collected by gillnet fishing in the Bohai Town section of the Mudanjiang River Basin from September to November 2023. After measuring 26 morphological traits, multivariate statistical analysis methods were applied to detect the morphological sexual dimorphism characteristics, and DNA metabarcoding technology was used to reveal its food composition. The results showed that there was no significant difference in body size between male and female Perccottus glenii, but significant sexual dimorphism was observed in partial morphological traits. Among them, the ratios of head height to head length, distance from dorsal fin to caudal fin to body length, pectoral fin length to body length, first dorsal fin base length to body length, first dorsal fin height to body length, second dorsal fin base length to body length, second dorsal fin height to body length, and anal fin height to body length of males were significantly higher than those of females, while the ratio of pelvic fin length to body length of males was significantly lower than that of females. It was inferred that the former was related to sexual selection, and the latter was associated with fecundity selection. The feeding habit results indicated that Perccottus glenii was an omnivorous fish with a preference for carnivory, and its main food source was macroinvertebrates such as arthropods.

Key words: Perccottus glenii, sexual dimorphism, diet, DNA metabarcoding technology

CLC Number:

Q917.4

LI Dian-wei, XU Meng-hao, SHAN Hong-jia, YANG Bin-bin, XU Qing, WANG Wan-ting, ZHANG Cheng-zhi, DING Sen. The sexual dimorphism and feeding ecology of Perccottus glenii in the Mudanjiang River[J]. HUBEI AGRICULTURAL SCIENCES, 2026, 65(1): 124-130.

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