Department of Biology, School of Education, Can Tho University, Can Tho, Vietnam.
Department of Molecular Biotechnology, Biotechnology Research and Development Institute, Can Tho University, Can Tho, Vietnam.
PeerJ. 2022 Aug 12;10:e13880. doi: 10.7717/peerj.13880. eCollection 2022.
(Hamilton, 1822) is a unique mudskipper living in the mudbanks from estuarine to riverine regions in the Vietnamese Mekong Delta (VMD), but there is no data on its growth patterns and condition factors that are helpful for fish resource assessment and adaptation understanding. This study was conducted at five sites, from the lower (Soc Trang province) to middle (Can Tho city) and upper (An Giang province) reaches of Bassac River in VMD, to provide knowledge on growth patterns and condition factors to this mudskippers. Fish samples were caught using traps and hands for 24 months, from July 2017 to June 2019, at these five sites. The total length and weight of 3,417 individuals (1,340 females and 2,077 males) varied by sex, season and site ( < 0.001 for all cases). This species exhibited a positive allometric type as the slope ( = 3.06 ± 0.01) of the length-weight relationship (LWR) was >3 ( < 0.001) for both sexes. The growth pattern changed with sex as mudskipper showed isometry in females but positive allometry in males. Maturity also affected fish growth type since it shifted from negative allometry in immature groups to positive allometry in mature groups. The growth pattern of fish changed from isometry in the dry season to positive allometry in the wet season. The mudskipper showed isometry at the lower reaches in Soc Trang but positive allometry at the middle and upper reaches in Can Tho and An Giang. The condition factor (CF) did not change according to sex, size and season, but with month and site variables. The present environmental condition in these studied sites tended to be not good enough for this fish as CF (0.95 ± 0.01) was less than 1 ( < 0.001). The findings provided basic information on the growth and adaptation of being helpful in fish adaptation understanding and resource conservation in VMD.
（Hamilton，1822）是一种生活在越南湄公河三角洲（VMD）河口到河流区域泥滩上的独特弹涂鱼，但目前还没有关于其生长模式和条件因素的数据，这些数据有助于鱼类资源评估和适应能力的了解。本研究在 VMD 的下 Bassac 河（ Soc Trang 省）、中 Bassac 河（ Can Tho 市）和上 Bassac 河（ An Giang 省）的五个地点进行，旨在为该弹涂鱼提供生长模式和条件因素方面的知识。2017 年 7 月至 2019 年 6 月，在这五个地点使用陷阱和手网捕捞鱼类样本，共捕捞到 3417 条个体（1340 条雌鱼和 2077 条雄鱼），其体长和体重因性别、季节和地点而异（所有情况均 < 0.001）。该物种表现出正异速生长类型，因为体长-体重关系（LWR）的斜率（ = 3.06 ± 0.01）对两性均 >3（ < 0.001）。生长模式因性别而异，弹涂鱼在雌鱼中表现为等比生长，在雄鱼中表现为正异速生长。成熟度也影响鱼类的生长类型，因为不成熟组的生长类型从负异速生长转变为成熟组的正异速生长。鱼类的生长模式从旱季的等比生长转变为雨季的正异速生长。在 Soc Trang 的下游，弹涂鱼表现为等比生长，但在 Can Tho 和 An Giang 的中游和上游表现为正异速生长。条件因子（CF）不因性别、大小和季节而变化，但与月份和地点有关。本研究中这些地点的环境条件对这种鱼类来说似乎不够好，因为 CF（0.95 ± 0.01）小于 1（ < 0.001）。这些发现提供了弹涂鱼生长和适应的基本信息，有助于了解鱼类的适应能力和 VMD 中的鱼类资源保护。
