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- Title
Length-weight Relationship and Condition Factor of Amur Goby Rhinogobius similis Gill, 1859 (Actinopteri: Gobiidae) from Different Areas in Vietnam.
- Authors
Linh Manh Ha; Hau Duc Tran; Nam Thanh Nguyen; Thanh Trung Tran; Thuy Thi Ta; Nga Thi Nguyen; Huy Quang Nguyen
- Abstract
Rhinogobius similis is a common freshwater goby, widely distributed from temperate to tropical regions. Information about the length-weight relationship (LWR) and condition factor (K) of this species, which is important for assessing and managing fish resources, is still limited. This study aimed to examine the variation of the LWR and K among seasons, localities and habitats of this species based on 2508 specimens collected in 2020-2021 from the Red River system in the north and a lake in the central highland of Vietnam. The standard length of the collected fish ranged 2.30-8.27 cm (4.65±0.84 cm) and the weight ranged 0.1-5.8 g (1.03±0.61 g). Fish weights could be predicted based on fish length with high accuracy, as the r² value of LWR was high (r² > 0.83). The b values ranged 2.804-3.462, being higher than those in temperate and subtropical populations in China. This species generally showed positive allometric growth with a b value generally larger than 3, meaning smaller individuals having more elongated body shape than older individuals. The estimated K value for all individuals was lower than the nutritional threshold of 1, thus suggesting that R. similis lived in unfavourable environmental conditions at the time of sampling. The growth pattern and K varied with season, locality and habitat. In the riverine habitat of the Red River, this species expressed a positive allometric growth during the rainy season but isometric during the dry season. The K values were higher than 1 in some cases and were higher during the rainy season as compared to the dry season, higher in the riverine habitat of the Red River and in the lacustrine habitat of the south than in other habitats. These latitudinal variances in the growth pattern and K across various regions affirm the adaptive ability of this species in various habitats. The obtained data will be useful for controlling this fish while managing ecosystems since it is abundant in tropical regions and has potential ecological impacts on native species.
- Publication
Acta Zoologica Bulgarica, 2022, Vol 74, Issue 4, p559
- ISSN
0324-0770
- Publication type
Article