The Loach as an object of experimental embryological studies at the Department of Embryology

The yolk syncytial layer (YSL) of Teleostei is a dynamic multifunctional temporary system. This paper describes the YSL structure of Misgurnus fossilis (Cobitidae) during its early developmental stages, studied using histological methods. YSL formation is prolonged. From the late blastula stage, the basal surface of the YSL is uneven and has protuberances, but becomes smoother during development. There are syncytial 'islands' with 1-2 yolk syncytial nuclei in the yolk mass. During epiboly, gastrulation and early segmentation, loach YSL is of different thickness in different regions along the dorso-ventral and antero-posterior axes of an embryo. The YSL is thickened in the dorsal region of gastrulae compared with the ventral region. Although the development of M. fossilis is similar to the development of zebrafish, there are important differences in YSL formation and organization that await further study and analysis. The study of YSL organization contributes to our knowledge of teleost developmental diversity and to the biology of temporary structures.

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“…At present M . fossilis is still actively used for both scientific and educational purposes (Sleptzova et al ., 2000).…”

Section: Introductionmentioning

confidence: 99%

“…Nuclear transplantation experiments have been also performed in this species (Gasaryan et al, 1979). At present M. fossilis is still actively used for both scientific and educational purposes (Sleptzova et al, 2000).…”

Section: Introductionmentioning

confidence: 99%