Effects of dietary inclusion of yacon, ginger and blueberry on growth, body composition and challenge test of juvenile rockfish (Sebastes schlegeli ) against Edwardsiella tarda

Abstract

Effects of dietary inclusion of yacon, Polymnia sonchifolia (YC), ginger, Zingiber officinale (GG), and blueberry, Vaccinium ashei (BB), on growth, body composition and challenge test of rockfish against Edwardsiella tarda compared to ethoxyquin were investigated. Three hundred and sixty fish were randomly distributed into 12 flowthrough tanks. Four experimental diets were prepared: the control diet (Con) with 0.1 g/kg ethoxyquin, and YC, GG and BB diets. Each diet was assigned to triplicate tanks of fish and hand-fed for 8 weeks. Externally normal fish after fourth and eighth weeks of feeding trial were infected with Edwardsiella tarda for challenge test. Weight gain and specific growth rate (SGR) of fish fed the YC diet were greater than those of fish fed all other diets. Feed efficiency, protein efficiency ratio and protein retention of fish fed the YC diet were higher than those of fish fed all other diets. In the both fourth and eighth weeks of infection trials, mortality of fish fed the Con diet was higher than that of fish fed all other diets. In conclusion, dietary inclusion of YC, GG and BB increased weight gain and SGR of fish. YC, GG and BB for 4 and 8 weeks lowered mortality of fish at occurrence of E. tarda. K E Y W O R D Sblueberry, challenge test, Edwardsiella tarda, ginger, rockfish (Sebastes schlegeli), yacon

Effects of Eucalyptus globulus leaf extract on growth performance, feed utilization and blood biochemistry of Nile tilapia, Oreochromis niloticus

“…Groups fed E. globulus extract recorded significantly higher levels of protein content in the whole body. This is similar to study by Kim et al (2018) which reported significantly higher carcass protein content in juvenile rockfish (Sebastes schlegeh). Also, the protein content recorded in this study confirm previous report by Mohammadi et al (2020) which documented higher values of carcass protein in common carp (Cyprinus carpio) fed ginger extracts.…”

Dietary Supplementation with Ginger (Zingiber officinale) Residue from Juice Extraction Improves Juvenile Black Rockfish (Sebastes schlegelii) Growth Performance, Antioxidant Enzyme Activity and Resistance to Streptococcus iniae Infection

“…This finding is consistent with our previous study, in which the proximate composition of juvenile S. schlegelii was not significantly affected by diet supplementation with 1% GRJE [ 34 ]. In contrast, Kim et al [ 33 ] reported significantly higher crude protein, crude lipid, and moisture content in juvenile S. schlegelii fed 1% dried ginger for 8 weeks. Additionally, juvenile Cyprinus carpio fed varying doses of ginger extract showed significant differences in carcass composition [ 6 ].…”

“…Supplementing fish diets with various types (powder, extract, oil, by-product, etc.) of ginger ( Zingiber officinale ) has been demonstrated to enhance fish performance [ 2 , 16 , 32 , 33 , 34 ]. In our previous study, we showed that dietary GRJE supplementation significantly improved juvenile black rockfish growth performance, innate immunity, and disease resistance against Gram-negative bacteria V. harveyi [ 34 ].…”

“…Moreover, ginger powder administration significantly improved O. niloticus resistance against S. agalactiae infection [ 17 ]. Dietary ginger powder also positively impacted the treatment of Gram-positive and/or Gram-negative bacterial infections in S. schlegelii [ 33 , 34 , 57 ]. Lee et al [ 34 ] reported that 1% GRJE-supplemented S. schlegelii groups attained a higher probability of survival against Gram-negative bacteria ( V. harveyi ) compared with groups that did not receive GRJE supplementation.…”

Effects of Dietary Andrographolide Levels on Growth Performance, Antioxidant Capacity, Intestinal Immune Function and Microbioma of Rice Field Eel (Monopterus Albus)

“…A large number of documents have shown that herbs and natural plants improved growth performance, enhanced immunity and increased disease resistance in aquaculture [ 43 , 44 , 45 ]. The present study demonstrated that diets supplemented with 75–150 mg/kg andrographolide increased growth and decreased the feed conversion rate in M. albus .…”