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Abstract
This study was conducted to elucidate the reproductive biological characteristics of the paperfin catfish Mystus wolffii distributed in the lagoon system of Hue City. A total of 858 specimens, with total lengths ranging from 72.8 to 132.5 mm, were collected from November 2023 to October 2024. The results indicated that sexual dimorphism in M. wolffii can be distinguished based on external morphological characteristics as well as the histological structure of the gonads, with a male-to-female ratio of 0.7:1. The gonadosomatic index (GSI) of both males and females reached peak values in July and August, with corresponding values of 2.23% and 2.36% in males, and 15.34% and 18.54% in females, respectively. The spawning season extended from February to October. The mean absolute fecundity was 13.450±5925 eggs per female, while the relative fecundity was 128±58 eggs g⁻¹ female body weight. The diameter of stage IV oocytes ranged from 558 to 851 µm, with a mean value of 685 ± 59.1 µm. The length at first sexual maturity (TL) was estimated at 89.34 mm for females and 77.81 mm for males.
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