Sex discrimination based on morphological traits in Mystus mysticetus Roberts, 1992

Abstract

This study supplemented the way of sex determination of fish based on the regression relationship of some morphological indicators of Mystus mysticetus. A total of 425 fish specimens were collected by trawl nets at Cai Rang - Can Tho and Long Phu - Soc Trang from January to July 2022. After collection, the fish were transferred to the laboratory to determine their total length (TL), standard length (SL), eye diameter (ED), eye distance (DE), body height (BD), head length (HL), and mouth width (MD) before anatomy for sex determination based on gonads. The regression analysis results of TL-SL, TL-ED, TL-DE, TL-BD, TL-HL, and TL-MD showed that SL, DE, and MD could be used to determine the sex of this fish species because SL and DE were dominant in growth in males, and MD was prevalent in females. In addition, SL could be used to determine the sampling time and HL to determine the distribution environment.

Sex differentiation via the relationship between some morphological measurements of Mystus albolineatus caught from Cai Rang - Can Tho and Long Phu - Soc Trang

“…In some species, this variation depended on the sex of the fish; for example, in Glossogobius sparsipapillus (Dinh et al, 2021a), males were more elongated than females, indicating that body length tends to grow stronger than the body height of the fish. In addition, in some other species of fish that have been studied, TL-SL relationships are also used to determine the sex of fish, such as Mystus mysticetus (Phan et al, 2022); Ellochelon vaigiensis (Nguyen et al, 2022). Besides, some other fish species can determine sex based on morphological relationships, such as Zacco koreanus (Kim et al, 2008), Heterotis niloticus (Obi, 2010), Glossogobius giuris (Dinh et al, 2021b), and Caragobius urolepis .…”

“…Therefore, this study aimed to provide a new way of sex determination in this fish without killing fish by measuring and determining the relationship of morphological features between them. In the world and Vietnam, there have been several studies to implement this method in many different fish species, such as Zacco koreanus (Kim et al, 2008), Heterotis niloticus (Obi, 2010), Glossogobius sparsipapillus (Dinh et al, 2021a), Glossogobius giuris (Dinh et al, 2021b), Ellochelon vaigiensis (Nguyen et al, 2022), Mystus mysticetus (Phan et al, 2022), Caragobius urolepis . These studies show that this method can be applied to determine sex in Mystus albolineatus.…”

Morphometrics allometry changes and sexual dimorphism in Caragobius urolepis (Gobiiformes: Gobiidae)

“…Another species from the same genus Glossogobius, e.g., Glossogobius giuris, also showed a distinct TL-HL relationship between males and females. The TL-SL, TL-DE, and TL-MD relationships could be to differentiate the sex of Mystus mysticetus−a freshwater catfish in the Mekong Delta (Phan et al, 2022). In saltwater fish such as Ellochelon vaigiensis, the TL-BD relationship can also be used to distinguish fish by sex (Dinh et al, 2021b).…”

“…Like Caragobius urolepis, Glossogobius giuris developed better BD in a suitable environment (freshwater versus saline intrusion). Likewise, according to Phan et al (2022), HL could be used to estimate the distribution environment of M. mysticetus.…”

Life‐history traits of a tropical bagrid catfish, Mystus mysticetus Roberts, 1992, caught from the Mekong Delta, Vietnam

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Mystus mysticetus, a member of the Bagridae family, is represented by three dark longitudinal stripes running vertically below the lateral line, a dark black spot at the back of the operculum, a gray-black margin, an adipose dorsal fin that is short-tall and quite a distance from the dorsal fin (Phan et al, 2022;Tran et al, 2013;Vo et al, 2021). The Mystus is of genera of the family Bagridae, a family of fish native to Africa and Asia (Berg, 1858), with about 21 genera and 89 species (Fricke et al, 2022).

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