Reproductive migration of a Telestes species is reported for the first time for the Balkan endemic Telestes pleurobipunctatus (Stephanidis, 1939) from Louros River (Northwestern Greece), while the embryonic and larval development is also described for the first time for this species and genus. Adult fish migrate in late winter upstream and spawn in a peak of 2–3 nights in the outflow of springs. Embryos at hatching measure approx. 6.0 mm notochord length (NL), flexion starts at 8.1 mm NL and food particles are noted in the digestive tract of larvae at 8.2 mm NL. The larval period is characterized by the sequential formation of fins and the development of scalation. Fin differentiation ends with the completion of pelvic fin rays and the disappearance of the pre‐anal finfold at 20.0 mm. First scales appear at 17.0 mm standard length (SL) and scalation completes at 27.8 mm SL. We propose that the size at a specific ontogenetic event, the pigmentation pattern and the pre‐anal myomeres' number comprise diagnostic characters that permit distinguishing T. pleurobipunctatus larvae from other sympatric cyprinids. We note the rare pattern of scale scalation and pigmentation pattern of the target species. Parapatric speciation in T. pleurobipunctatus possibly related to its spawning migration pattern, as well as the use of larval identification in monitoring and conservation programmes targeting threatened cyprinids exhibiting this type of reproductive behaviour are also discussed.

中文翻译：

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关于Telestes属的一个鲤科鱼类的产卵移徙和早期生命发育的首次报告

一的生殖洄游Telestes物种报道，第一次巴尔干地方性Telestes pleurobipunctatus（Stephanidis，1939年）来自洛罗斯河（希腊西北部），而该物种和属的胚胎和幼体发育也首次被描述。成年鱼在冬季末期向上游迁移，并在春季流出的2-3晚高峰期产卵。孵化时的胚胎大小约为 脊索长度为6.0毫米（NL），弯曲开始于8.1毫米NL，食物颗粒在幼虫的消化道中为8.2毫米NL。幼虫期的特征是鳍的顺序形成和鳞屑的发展。鳍分化结束于骨盆鳍射线的完成和肛门前鳍折叠在20.0 mm处的消失。第一个刻度出现在17.0毫米标准长度（SL）处，并且缩放完成于27.8毫米SL。我们建议特定个体发生事件的大小，T. pleurobipunctatus幼虫来自其他同胞的塞浦路斯人。我们注意到目标物种罕见的鳞片鳞屑和色素沉着模式。在Parapatric形态T. pleurobipunctatus可能与它的产卵迁移模式，以及在监测和保护方案靶向先兆鲤科表现出这种类型的生殖行为使用的幼虫识别进行了讨论。