This investigation revealed the first biological bases of embryonic development until the hatching of South Pacific bonito Sarda chiliensis chiliensis eggs. The characteristics and stages of embryonic development were described until the hatching stage. The eggs were obtained by natural spawning from wild-caught broodstocks that were conditioned to captivity for more than 1 year in a 75 m³ marine land-based aquaculture recirculating system in Chile. The water temperature range in the broodstock RAS, during the natural spawns events, was between 18.6 °C and 19.8 °C in December 2012, between 20.4 °C and 21.2 °C in January 2013, between 21.5 °C and 22.4 °C in February 2013, and between 21.90 °C and 22.87 °C in march. Incubators’ water temperature was kept similar, through daily water exchanges, to the temperature recorded at the broodstock tank to lessen thermal stress which could affect the embryonic development. Thirty-one embryonic stages were characterized in 71.83 h until eggs hatching. Five periods of embryonic were distinguished: morula, blastula, gastrula, neurula, and metamery. Translucent telolecitic eggs hatched on the third day of incubation, and which was comparatively longer than reported for Atlantic bonito Sarda sarda and the eastern Pacific bonito Sarda chiliensis lineolata. The morphometric data with the most significant variability between the stages of embryonic development were: the length and height of the head, and the length and height of the eye. These are the first embryonic development studies conducted with eggs naturally spawned from wild-caught Sarda chiliensis chiliensis.

这项调查揭示了直到南太平洋鱼Sarda chiliensis chiliensis卵孵化之前，胚胎发育的第一个生物学基础。描述了胚胎发育的特征和阶段，直到孵化阶段。这些卵是从自然捕获的亲鱼中自然产卵获得的，这些亲鱼在75 m ^3的环境中被圈养了一年以上智利海洋陆基水产养殖循环系统。亲虾RAS的水温范围在自然产卵期间于2012年12月在18.6°C至19.8°C之间，在2013年1月在20.4°C至21.2°C之间，在2月在21.5°C至22.4°C之间2013年，3月为21.90°C至22.87°C。通过每天换水，孵化器的水温保持与亲鱼罐中记录的温度相似，以减少可能影响胚胎发育的热应激。在卵孵化之前的71.83小时内，共有31个胚胎阶段。区分了五个时期的胚胎：桑ula，囊胚，胃，神经节和异体。孵化第三天孵出的半透明毛卵卵，比大西洋鱼的卵长Sarda sarda和东太平洋鱼Sarda chiliensis lineolata。胚胎发育各阶段之间变化最大的形态计量数据是：头部的长度和高度，以及眼睛的长度和高度。这些是首次从野生捕捞的Sarda chiliensis chiliensis产卵的卵进行的胚胎发育研究。