Miranda Valeria, Cohen Stefanía, Díaz Alcira O, Diaz Marina V
Laboratorio de Histología e Histoquímica, Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Mar del Plata, Mar del Plata, Argentina.
Instituto de Investigaciones Marinas y Costeras (IIMyC), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Mar del Plata, Argentina.
J Morphol. 2020 Apr;281(4-5):465-475. doi: 10.1002/jmor.21113. Epub 2020 Feb 24.
During the early ontogeny of fish larvae, the accurate development of the visual system plays a key role, because it is involved in locating food, orientation, selection of favorable habitat, and evasion of predators. The structure of the eye of the fish is typical of vertebrates, with some modifications related to the aquatic environment. In the present work, we describe the development of the larval eye of Engraulis anchoita for the first time. Larvae were collected at the Permanent Station of Environmental Studies (EPEA) in coastal waters of the Southwestern Atlantic Ocean during research cruises in 2015 and 2016. We describe the histology of the retina layers, determine the beginning of the functionality of the eye, and discuss a possible synchronization with the development of the digestive tract. This study provides information about the biology of E. anchoita, the most abundant fish species in the southwestern Atlantic Ocean. Also, recent studies have shown responses of the retina and other tissues to the increase in environmental acidity. Therefore, results of this study are also discussed with respect to the possible effect of acidification on the larvae of this species. The continuity of the time series developed at the EPEA will allow monitoring the effect of long-term environmental and biological variables on the early ontogeny of anchovy in the context of climate change. The high commercial fishing potential of E. anchoita due to its high abundance, as well as its essential role in the trophic web of other commercially valuable fishing resources of Argentina, reinforce the need to continue deepening knowledge about this species. Research highlights: Eyes of Engraulis anchoita larvae are functional from early larval stages. At hatching, the retina is formed by only few layers from which the other layers differentiates during ontogeny. Focal distance increases with larval growth.
在鱼类幼体的早期个体发育过程中，视觉系统的精确发育起着关键作用，因为它涉及到寻找食物、定向、选择适宜栖息地以及躲避捕食者。鱼类眼睛的结构是脊椎动物的典型结构，但有一些与水生环境相关的变化。在本研究中，我们首次描述了阿根廷鳀幼体眼睛的发育情况。2015年和2016年研究航行期间，在西南大西洋沿海水域的环境研究常设站（EPEA）采集了幼体。我们描述了视网膜层的组织学结构，确定了眼睛功能开始的时间，并讨论了其与消化道发育可能的同步性。本研究提供了关于阿根廷鳀生物学的信息，阿根廷鳀是西南大西洋最丰富的鱼类物种。此外，最近的研究表明视网膜和其他组织对环境酸度增加的反应。因此，本研究结果也从酸化对该物种幼体可能产生的影响方面进行了讨论。在EPEA建立的时间序列的连续性将有助于在气候变化背景下监测长期环境和生物变量对鳀鱼早期个体发育的影响。由于其数量众多，阿根廷鳀具有很高的商业捕捞潜力，以及它在阿根廷其他具有商业价值的捕捞资源的营养网中的重要作用，强化了继续深入了解该物种的必要性。研究亮点：阿根廷鳀幼体的眼睛在幼体早期阶段就具有功能。孵化时，视网膜仅由几层组成，在个体发育过程中其他层从中分化出来。焦距随着幼体生长而增加。
