Saemi-Komsari M, Mousavi-Sabet H, Kratochwil C F, Sattari M, Eagderi S, Meyer A
Department of Fisheries, Faculty of Natural Resources, University of Guilan, Sowmeh Sara, Guilan, Iran.
Zoology and Evolutionary Biology, Department of Biology, University of Konstanz, 78457, Constance, Germany.
J Fish Biol. 2018 Jun;92(6):1888-1901. doi: 10.1111/jfb.13627. Epub 2018 Apr 26.
The electric yellow cichlid Labidochromis caeruleus is a mouth-brooding haplochromine cichlid from Lake Malawi and one of the most popular cichlids in the ornamental fish industry. To investigate the early development of L. caeruleus from hatching until the juvenile stage, we studied its morphological development and allometric growth patterns. In newly-hatched larvae, most organs and body parts were not yet differentiated and continued to develop until 15 days post hatching (dph). The yolk sac was depleted at 13 dph. There was allometric growth, primarily in the anterior and posterior regions of the body, and inflection points when trajectories of allometric growth changed. Head and tail growth was prioritized, suggesting that body parts linked to feeding and swimming behaviour mature earlier than the rest of the body. Additionally, growth patterns revealed that development of organs related to vital functions such as branchial respiration, sensation, exogenous feeding and swimming was prioritized. Comparisons with other African and Neotropical cichlids revealed differences in ontogenetic processes and allometric growth along the anterior-posterior axis as well as variation in developmental timing. These results indicate how early morphological development and ontogenic processes might respond to the distinctive parental care observed in mouth-brooding cichlids.
电光黄丽鱼（Labidochromis caeruleus）是一种来自马拉维湖的口孵型丽鱼科鱼类，也是观赏鱼行业中最受欢迎的丽鱼品种之一。为了研究电光黄丽鱼从孵化到幼鱼阶段的早期发育过程，我们对其形态发育和异速生长模式进行了研究。在刚孵化的幼体中，大多数器官和身体部位尚未分化，并在孵化后15天（dph）内持续发育。卵黄囊在13 dph时耗尽。存在异速生长现象，主要发生在身体的前部和后部区域，并且在异速生长轨迹发生变化时有拐点。头部和尾部的生长优先进行，这表明与摄食和游泳行为相关的身体部位比身体其他部位成熟得更早。此外，生长模式显示，与重要功能相关的器官，如鳃呼吸、感觉、外源摄食和游泳等器官的发育优先进行。与其他非洲和新热带丽鱼的比较揭示了个体发育过程和沿前后轴的异速生长的差异，以及发育时间的变化。这些结果表明了早期形态发育和个体发育过程可能如何响应口孵型丽鱼中观察到的独特亲代抚育方式。
