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6 September 2021 The Fate of the Yolk Syncytial Layer during Postembryonic Development of Stenodus leucichthys nelma
Ekaterina A. Kondakova, Vera A. Bogdanova
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Abstract

The yolk syncytial layer (YSL) is a multifunctional transient structure of teleost embryos and larvae. The YSL performs nutritional, morphogenetic and immune functions. However, the data on the YSL structure in different teleost species is fragmented. We aimed to characterize YSL of the postembryonic inconnu (Stenodus leucichthys nelma) along with the depletion of maternal reserves by analyzing serial histological sections. At hatching, the yolk complex was located anterior to the liver and contained a large oil globule (OG) in the front region, 1–2 additional OG, and the yolk itself. The YSL region around the OG was striated, the region surrounding the yolk was regionalized in an apico-basal direction. The yolk syncytial nuclei (YSN) were large and complex-shaped. The yolk was exhausted by approximately the 17th day post hatching (dph). One–two large OG remained in the yolk complex until the programmed death of the YSL at 31 dph. The organization of the larval yolk complex of the inconnu was typical for Coregonidae. The abundance of comet-shaped YSN was its peculiarity.

© Finnish Zoological and Botanical Publishing Board
Ekaterina A. Kondakova and Vera A. Bogdanova "The Fate of the Yolk Syncytial Layer during Postembryonic Development of Stenodus leucichthys nelma," Annales Zoologici Fennici 58(4-6), 155-160, (6 September 2021). https://doi.org/10.5735/086.058.0404
Received: 22 July 2020; Accepted: 20 January 2021; Published: 6 September 2021
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