SOME BIOLOGICAL CHARACTERISTICS OF  MOSQUITO FISH GAMBUSIA AFFINIS (BAIRD & GIRARD, 1853)  IN THREE PROTECTED AREAS FROM NORTHERN VIETNAM

Nguyễn Minh Thúy; Tạ Thị Thủy; Nguyễn Trần Ngọc Mai; Trần Đức Hậu

doi:10.34238/tnu-jst.10584

SOME BIOLOGICAL CHARACTERISTICS OF MOSQUITO FISH GAMBUSIA AFFINIS (BAIRD & GIRARD, 1853) IN THREE PROTECTED AREAS FROM NORTHERN VIETNAM

About this article

Received: 10/06/24 Revised: 16/10/24 Published: 17/10/24

Authors

1. Nguyen Minh Thuy, Ha Noi National University of Education
2. Ta Thi Thuy, Ha Noi Metropolitan University
3. Nguyen Tran Ngoc Mai , Ha Noi National University of Education
4. Tran Duc Hau, Ha Noi National University of Education

Abstract

Mosquito fish Gambusia affinis is an invasive alien species, but little is known about its biological traits. The present study attempted to analyze its biological characteristics based on 239 specimens collected from three nature reserves, northern Vietnam (Phia Oac - Phia Den, Cao Bang province, Bac Me, Ha Giang province and Cham Chu, Tuyen Quang province) in six field surveys from 2019 to 2021. It shows that there is a close correlation in length and weight of the fish in the study site. In Bac Me Nature Reserve and Phia Oac - Phia Den National Park, the fish revealed a positive allometric (b > 3), and condition coefficient K = 1.01 ± 0.11 SD, which show that the fish population had adapted well to the environment. The relative length of gut (RLG) = 0.49 ± 0.012 SD indicates that this is a carnivorous fish. Food contents of this fish are narrow, mainly mosquito larvae. The average male/female ratio is 0.58, and absolute fertility ranges from 2 to 90 oocytes, with an average of 22.31 cells. This work firstly provides some biological features of this exotic fish species in the wild, which serve as a scientific basis for assessment and measures to prevent their impact on freshwater ecosystems in Vietnam.

Keywords

Gambusia affinis; Food contents; Fecundity; Exotic animals; Natunal reserves in northern Vienam

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DOI: https://doi.org/10.34238/tnu-jst.10584

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