A Study on the Metabolic Rate Change Pattern in F₂ Hybrid Sturgeon, the Bester (<i>Huso huso</i> × <i>Acipenser ruthenus</i>), during the Early Developmental Stage

The primary goal in aquaculture is to maximize the growth and survival of farmed fishes at a minimal cost, which requires an understanding of the changes in metabolism undergone by different fish breeds during development. In particular, highly intensive aquaculture production systems, such as recirculating aquaculture systems, require a better understanding of oxygen consumption. Ontogenetic phase shifts (i.e., sudden changes) in metabolism have been observed in several aquaculture species during early development, and such metabolic phase shifts may help to predict the oxygen consumption of aquaculture species during different stages of their development. Here, I analyzed the pattern of metabolic changes in the F2 hybrid sturgeon, the bester (Huso huso × Acipenser ruthenus; hereafter, referred to as the F2 bester), during its early development. I observed ontogenetic phase shifts in metabolism in the F2 bester at body mass values of about 0.2 and 0.8 g. Thus, the F2 bester undergoes ontogenetic phase shifts in metabolism during early development, which can help to characterize oxygen consumption at a specific developmental period. Therefore, oxygen can be appropriately adjusted and replenished during breeding