Contreras-Tapia Rubén Alonso, Benítez-Díaz Mirón Marcela Ivonne, Garza Mouriño Gabriela, Castellanos-Páez María Elena
Laboratorio de Rotiferología y Biología Molecular de Plancton, Departamento El Hombre y su Ambiente, Universidad Autónoma Metropolitana, Unidad Xochimilco, Mexico City, Mexico.
J Fish Biol. 2024 Dec;105(6):1588-1602. doi: 10.1111/jfb.15898. Epub 2024 Aug 10.
This study delves into the early development of Vieja fenestrata (Cichlidae), with a specific focus on the description of external morphological and morphometric changes, and growth patterns from hatching to the loss of larval characters under controlled laboratory conditions at a temperature of 28°C. Asynchronous hatching was observed between 58 and 60 h postfertilization, with the posterior body emerging first. Over 14 days, significant morphological, physiological, and behavioral changes were observed, revealing a complex developmental trajectory. The initial developmental phases were characterized by rapid vascularization, fin differentiation, and heightened activity, and the subsequent days witnessed the flexion of the notochord, emergence of swim bladder functionality, and transition to exogenous feeding. Maturation progressed with the absorption of the yolk sac, regression of cement glands, and fin ray development, culminating in metamorphosis by 14 days post-hatching. Throughout this period, evolving pigmentation patterns and structural adaptations highlight the species' adaptive strategies. During the larval period of V. fenestrata, substantial changes in morphological proportions were observed. Before the inflection, tail length, trunk length, and body depth had negative allometric growth, and head length, eye diameter, and snout length had positive allometric growth. After the inflection, body depth and snout length showed positive allometric growth; head length and trunk length exhibited isometric growth, whereas tail length and eye diameter demonstrated negative allometric growth. These findings contribute insights into the intricate developmental dynamics of V. fenestrata. Moreover, further research may explore these developmental dynamics' ecological and evolutionary implications.
本研究深入探讨了孔唇丽鱼（丽鱼科）的早期发育，特别着重于描述在28°C的受控实验室条件下，从孵化到幼体特征消失期间的外部形态和形态测量变化以及生长模式。在受精后58至60小时观察到异步孵化，身体后部先出现。在14天内，观察到显著的形态、生理和行为变化，揭示了一条复杂的发育轨迹。初始发育阶段的特征是快速血管化、鳍分化和活动增强，随后几天见证了脊索弯曲、鳔功能的出现以及向外源摄食的转变。成熟随着卵黄囊的吸收、粘腺的退化和鳍条的发育而推进，最终在孵化后14天完成变态。在整个这段时间里，不断演变的色素沉着模式和结构适应突出了该物种的适应策略。在孔唇丽鱼的幼体期，观察到形态比例发生了显著变化。在拐点之前，尾长、躯干长和体深呈负异速生长，而头长、眼径和吻长呈正异速生长。在拐点之后，体深和吻长呈正异速生长；头长和躯干长呈等速生长，而尾长和眼径呈负异速生长。这些发现有助于深入了解孔唇丽鱼复杂的发育动态。此外，进一步的研究可以探索这些发育动态的生态和进化意义。
