Effects of Feeding Regimes, Water Temperature, and Flow Velocity on the Rearing Performance of Xenophysogobio nudicorpa

Abstract

Xenophysogobio nudicorpa is a small benthic cyprinid endemic to the upper Yangtze River. This study evaluated the effects of first-feeding diets, formulated feeds, water temperature, and flow velocity on larval and juvenile rearing performance. Larvae fed a combination of rotifers and Artemia nauplii achieved the highest survival (90.5%) and balanced growth. For juveniles, a high-protein diet (≥50% crude protein) significantly improved growth (SGR: 0.427%/day) and survival (90%) compared to lower-protein diets or frozen bloodworms. Optimal environmental conditions were identified as 17–19°C and a flow velocity of 20 cm/s, both yielding approximately 90% survival. These findings provide the first comprehensive rearing protocol for this species, supporting conservation aquaculture efforts.