Ontogeny of a threatened freshwater minnow: Implications for conservation

IF 1.1 4区 生物学 Q4 ANATOMY & MORPHOLOGY
Acta Zoologica Pub Date : 2024-01-11 DOI:10.1111/azo.12492
Evangelia Karageorgou, Yiannis Kapakos, Roberta Barbieri, Leonidas Vardakas, Nafsika Karakatsouli, Eleni Kalogianni
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引用次数: 0

Abstract

Investigating the ontogeny of threatened freshwater fishes is vital for designing future conservation actions that will increase the potential of species' persistence. This study provides a detailed description of the early life stages of a threatened freshwater fish species, the Evrotas minnow Pelasgus laconicus, which occupies aquatic ecosystems with extreme seasonal hydrological variation. The study of the embryonic and juvenile stages was conducted in vivo using light microscopy from eggs obtained from acclimatized wild spawners at 20 ± 1°C. Fertilized eggs were spherical and transparent with a mean diameter of 1.24 ± 0.06 mm and the average length of free embryos at hatching was 3.85 mm NL (notochord length). The main morphological changes observed are related to the absorption of the yolk, the increase and distribution of the melanophores and the sequential development of the fins. In conclusion, the Evrotas minnow was identified as a multiple spawner, exhibiting a protracted reproductive period (March to August), a particularly short egg-hatching period (5–6 days), a short free embryo stage and a rapid onset of exogenous feeding (2 days). The conservation implications of our study, such as safety stock creation, population reintroduction, conservation of fish refugia and breeding habitats and beaver dam analogues, are discussed.
一种濒危淡水小鱼的个体发育:对保护的影响
调查受威胁淡水鱼类的个体发育过程对于设计未来的保护行动至关重要,这将提高物种存活的可能性。本研究详细描述了一种濒危淡水鱼类--伊夫罗塔鲦鱼(Pelasgus laconicus)的早期生命阶段,该鱼类生活在季节性水文变化极大的水生生态系统中。对胚胎和幼鱼阶段的研究是在 20±1°C 的环境中,利用光学显微镜对野生产卵者的受精卵进行活体观察。受精卵呈球形,透明,平均直径为 1.24 ± 0.06 毫米,孵化时自由胚胎的平均长度为 3.85 毫米 NL(脊索长度)。观察到的主要形态变化与卵黄的吸收、黑色素细胞的增加和分布以及鳍的顺序发育有关。总之,Evrotas 鯰被确定为一种多次产卵者,其生殖期长(3 月至 8 月),卵孵化期特别短(5-6 天),自由胚胎期短,外源摄食开始时间快(2 天)。本文讨论了我们的研究对保护工作的影响,如建立安全种群、重新引入种群、保护鱼类避难所和繁殖栖息地以及海狸坝类似物。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Acta Zoologica
Acta Zoologica 生物-动物学
CiteScore
2.90
自引率
8.30%
发文量
35
审稿时长
>12 weeks
期刊介绍: Published regularly since 1920, Acta Zoologica has retained its position as one of the world''s leading journals in the field of animal organization, development, structure and function. Each issue publishes original research of interest to zoologists and physiologists worldwide, in the field of animal structure (from the cellular to the organismic level) and development with emphasis on functional, comparative and phylogenetic aspects. Occasional review articles are also published, as well as book reviews.
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