Features of Biology of Tonlesapia tsukawakii (Actinopterygii, Callionymidae) in the Mekong Delta, Vietnam

IF 0.5 4区生物学 Q4 FISHERIES

Journal of Ichthyology Pub Date : 2024-02-01 DOI:10.1134/s0032945224010028

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Abstract

Abstract—

Tonlesapia tsukawakii Motomura et Mukai, 2006 is an endemic freshwater representative of the family Callionymidae (Teleostei: Perciformes: Callionymidei) living in the Mekong River. According to the materials of studies conducted in 2018–2022, the occurrence of the species in catches in the Mekong Delta averaged 20.7%, the proportion in terms of abundance was 2.6%, in terms of weight, 0.6%. The maximum values of the species parameters were 81.2 ind./effort and 176.2 g/effort, respectively. The abundance of fish significantly decreased in the conditions of low content of dissolved oxygen and on a substrate with plant residues. The sex ratio of T. tsukawakii was 1.0 : 3.1 with a stable prevalence of females, which distinguishes the species from other representatives of the family. Females have larger sizes compared to males and they gain weight faster. The fecundity of the species was determined for the first time; the average number of mature oocytes was 2950 psc. During a low-water period, callanoid copepods of the family Pseudodiaptomidae mainly represented by Pseudodiaptomus dauglishi Sewell, 1932 were the main food items of T. tsukawakii.

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越南湄公河三角洲鲎（翼手目，鲎科）的生物学特征

摘要- Tonlesapia tsukawakii Motomura et Mukai, 2006是生活在湄公河中的一种特有的淡水代表鱼类，属于Callionymidae科（Teleostei: Perciformes: Callionymidei）。根据 2018-2022 年的研究资料，该物种在湄公河三角洲渔获物中的平均出现率为 20.7%，丰度比例为 2.6%，重量比例为 0.6%。物种参数的最大值分别为 81.2 ind./effort 和 176.2 g/effort。在溶解氧含量较低的条件下，以及在含有植物残渣的底质上，鱼类的数量明显减少。Tsukawakii 的性别比例为 1.0 : 3.1，雌性比例稳定，这使其有别于该科的其他代表物种。与雄性相比，雌性体型更大，增重更快。首次测定了该物种的繁殖力；成熟卵母细胞的平均数量为 2950 psc。在枯水期，以 Pseudodiaptomus dauglishi Sewell, 1932 为主要代表的伪足目桡足类是 Tsukawakii 的主要食物。

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来源期刊

Journal of Ichthyology Multiple-

CiteScore

1.00

自引率

28.60%

发文量

期刊介绍： Journal of Ichthyology is an international peer-reviewed journal published in collaboration with the Russian Academy of Sciences. It covers original studies in fish taxonomy, evolution, molecular biology, morphology, species diversity, zoological geography, genetics, physiology, ecology, behavior, reproduction, embryology, invasions, and protection. Some problems of applied ichthyology are also covered. The journal welcomes manuscripts from all countries in the English or Russian language.