Abstract
BackgroundRussian sturgeon (Acipenser gueldenstaedtii) is an emerging candidate species in the Korean aquaculture domain owing to its highly valued caviar. Although the embryonic development of this species was previously described, the complete image data on the morphological differentiation of developing embryos have not been yet fully available. Further, with the viewpoint of larval production in hatchery, the effects of temperature on embryonic viability and the temporal window of hatching event have not been extensively studied. Hence, the objective of this study was to provide a complete set of photographic image data on the embryogenesis and also to examine the effects of incubation temperatures on embryonic viability and hatching event in farm-bred Russian sturgeon.ResultsTypical characteristics of embryonic development including uneven, holoblastic cleavages with unequal blastomeres, followed by the formation of germ layer, neurulation, and organogenesis until hatching, were documented. Under different temperature conditions (12, 16, or 20 °C), viability of embryos incubated at 12 °C was significantly lower as relative to those of 16 and 20 °C incubated embryos. Hatchability of embryos was higher, and the timing of hatching event was more synchronized at 20 °C than at 12 and 16 °C.ConclusionData from this study suggest that the incubation of Russian sturgeon embryos at 20 °C would be desirable in the hatchery practice with respect to the good hatchability of embryos and the synchronization of hatching events. Additionally, the updated image data for complete embryonic development could be a useful reference guide for not only developmental researches but also artificial propagation of Russian sturgeon in farms.
Highlights
Russian sturgeon (Acipenser gueldenstaedtii) is an emerging candidate species in the Korean aquaculture domain owing to its highly valued caviar
The Russian sturgeon was first introduced to Korean farm 15 years ago, reproductive control and artificial seedling production of this sturgeon species have been hardly achieved until the mid-2010s
Developmental patterns observed in this study were, in overall, accordant with previous descriptions (Dettlaff et al 1993; Park et al 2013b), the onsets and transitions of a particular stage did not exactly match the time points reported in previous works, probably mainly due to the difference in incubation temperatures
Summary
Russian sturgeon (Acipenser gueldenstaedtii) is an emerging candidate species in the Korean aquaculture domain owing to its highly valued caviar. With the viewpoint of larval production in hatchery, the effects of temperature on embryonic viability and the temporal window of hatching event have not been extensively studied. The objective of this study was to provide a complete set of photographic image data on the embryogenesis and to examine the effects of incubation temperatures on embryonic viability and hatching event in farm-bred Russian sturgeon. Knowledge on the optimal temperature range of egg incubation is essential for successful artificial seedling production in aquaculture, and the application of micromanipulation. The Russian sturgeon (Acipenser gueldenstaedtii) is an emerging candidate in the Korean aquaculture domain, mainly owing to its highly valued caviar (Ossetra caviar) (Kim et al 2009). Developmental stages of Russian sturgeon embryos have been outlined previously by hand-sketched illustrations with
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