Effects of the Feeding Rate on Growth Performance, Body Composition, and Hematological Properties of Juvenile Mandarin Fish Siniperca scherzeri in a Recirculating Aquaculture System

Yi-Oh Kim,Sung-Yong Oh,Taewon Kim

doi:10.3390/su13158257

Yi-Oh Kim, Sung-Yong Oh + Show 1 more

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https://doi.org/10.3390/su13158257

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Abstract

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−1]) on the growth, body composition, and blood properties of juvenile mandarin fish, Siniperca scherzeri, (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−1, 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−1 but decreased significantly in those fed 3.0% BW day−1. The lipid content of fish fed 2.5% BW day−1 was significantly higher than that at 0.5–1.5% BW day−1. The total plasma cholesterol content was significantly lower in fish fed 0.5 BW day−1 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 S. scherzeri weighing between 18 g and 54 g was estimated at 1.88–2.80% BW day−1 depending on weight gain, specific growth rate, and feed efficiency under 26.9 °C conditions.

Highlights

In Korea, China, and Vietnam, fish of the genus Siniperca [1,2] are commercially valuable because the meat is palatable [1,2,3,4]
We investigated the effects of the feeding rate on the growth, body composition, and hematological properties of juvenile
Increasing the feeding rate hadrate a significant influence on the growth juvenile

Summary

Introduction

In Korea, China, and Vietnam, fish of the genus Siniperca [1,2] are commercially valuable because the meat is palatable [1,2,3,4]. They are challenging to farm with formulated fish feed due to their strong preference for live prey [5,6], and the commercial supply of S. scherzeri is limited [4,7]. The growth of farmed fish is affected by several factors, an optimized feeding regimen is considered to be crucial for the maximum growth of the species [11,12]. The optimal feeding rate varies with the fish species, size, feed composition, and culture conditions [20], which explains the need

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