标题：Effects of the Feeding Rate on Growth Performance, Body Composition, and Hematological Properties of Juvenile Mandarin Fish <i>Siniperca scherzeri</i> in a Recirculating Aquaculture System
摘要：The effects of feeding rate (0.5%, 1.0%, 1.5%, 2.0%, 2.5%, and 3.0% body weight [BW] per day [BW day<sup>−1</sup>]) on the growth, body composition, and blood properties of juvenile mandarin fish, <i>Siniperca scherzeri</i>, (initial BW 18.4 ± 0.2 g) were investigated in a water recirculating aquaculture system. Triplicate groups of fish were fed an experimental diet (55.4% protein, 14.1% lipid) for 10 weeks. Weight gain and specific growth rate increased with increasing feeding rates of up to 2.5% BW day<sup>−1</sup>, after which no significant increase in growth was observed. Feed efficiency, protein efficiency ratio, and protein retention were not significantly different among the fish fed 1–2.5% BW day<sup>−1</sup> but decreased significantly in those fed 3.0% BW day<sup>−1</sup>. The lipid content of fish fed 2.5% BW day<sup>−1</sup> was significantly higher than that at 0.5–1.5% BW day<sup>−1</sup>. The total plasma cholesterol content was significantly lower in fish fed 0.5 BW day<sup>−1</sup> than fish provided with other feeding rates. Based on the growth, feed efficiency, body composition, and blood content analyses, including regression analysis, the optimal feeding rate for juvenile <i>S. scherzeri</i> weighing between 18 g and 54 g was estimated at 1.88–2.80% BW day<sup>−1</sup> depending on weight gain, specific growth rate, and feed efficiency under 26.9 °C conditions.
