Effects of Feed Particle Size, Stocking Density, and Dissolved Oxygen Concentration on the Growth of Olive Flounder Paralichthys olivaceus

Abstract

We performed three sets of feeding trials to establish the optimal feed size (Exp-I), stocking density (Exp-II), and dissolved oxygen level (DO) (Exp-III) for olive flounder Paralichthys olivaceus. In Exp-1, four replicate groups of fish (53.6±0.9 g) were fed commercial diets with three particle sizes (small, medium, and large). In Exp-II, fish (30.0±0.1 g) were reared at four stocking densities (1.8, 3.5, 5.3, and 7.1 kg/m 3 ). In Exp-III, fish (187±1.48 g) were reared under two different DO levels (2-3 and 6-7 mg/L). In Exp-I, fish fed the large-particle diet gained significantly more weight and had a lower feed conversion ratio than fish fed the small-and medium-particle diets. In Exp-II, fish reared at 1.8 and 3.5 kg/m 3 gained slightly more weight and had lower feed conversion ratios than fish reared at 5.3 and 7.1 kg/ m 3 , although these differences were not significant. In Exp-III, negative effects were observed in the low DO groups. Therefore, under our experimental conditions, the optimal feed particle size, stocking density, and DO level for olive flounder were 9-9.4 mm, 3.5 kg/m 3 , and 6-7 mg/L, respectively.

Analysis of Polymeric Immunoglobulin Receptor Expression in Olive Flounder (Paralichthys olivaceus) against Viral Hemorrhagic Septicemia Virus

“…However, competition in olive flounder farming is gradually declining due to an increase in the incidence of various diseases, deterioration of water quality due to environmental pollution, and labor and production costs. Moreover, the increase in breeding density to reduce production costs has affected the growth rate, feed intake rate, productivity, and survival rate of fish ( Refstie, 1977 ; Rowland et al., 2006 ; Kim et al, 2015 ; Seo, 2020 ). In particular, mass mortality and diseases have been observed in fish due to the stress caused by an increase in breeding density ( Holm et al, 1990 ; Björnsson, 1994 ; Noble & Summerfelt, 1996 ).…”