Abstract—
The results of the study of the distribution and biology of the duskyfin glassy perchlet Parambassis wolffii (Bleeker, 1850) in the Mekong Delta in 2019–2020 are presented. It is established that the species reaches the highest abundance and biomass in the freshwater part of the delta. The water temperature at which individuals of the species were encountered was 27.8–34.1°C, salinity, up to 1.51‰, depths, from 2 to 35 m. The maximum total length of females and males was 20.0 and 14.7 cm, respectively, and the maximum age was 6 years. The parameters of the von Bertalanffy equation are as follows: the maximum length is 17.2 cm, the growth rate constant is 0.18, t0 = −2.35. The value of the coefficient b in the equation on the weight-length relationship is 3.002 ± 0.056 for females (isometry) and 2.774 ± 0.064 for males (negative allometry). Intersexual differences by the in Fulton’ condition factor were established: in females 3.71 ± 0.04, in males 3.53 ± 0.03. The first mature individuals were found at a length of 7–8 cm at the age of 1+.
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Funding
The study was conducted within the framework of the theme Ekolan E-3.4 “The impact of climate change and anthropogenic factors on the ecosystems of the lower reaches of the Mekong River” and the state assignments of the Institute of Biology of the Southern Seas, Russian Academy of Ssciences “Patterns of formation and anthropogenic transformation of biodiversity and bioresources of the Azov-Black Sea basin and other areas of the World Ocean” (no. 121030100028-0) and “Fundamental studies of population biology of marine animals, their morphological and genetic diversity” (no. 121040500247-0).
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Ablyazov, E.R., Chesnokova, I.I., Kutsyn, D.N. et al. Distribution and Biology of Duskyfin Glassy Perchlet Parambassis wolffii (Ambassidae) in the Mekong River Delta, Vietnam. J. Ichthyol. 63, 891–901 (2023). https://doi.org/10.1134/S0032945223050016
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DOI: https://doi.org/10.1134/S0032945223050016