scholarly journals Crude fat, digestible protein and DL-carnitine levels in plant-based diets to Nile tilapia Oreochromis niloticus fingerlings

2020 ◽  
Vol 48 (4) ◽  
pp. 626-636
Author(s):  
Samantha Chung ◽  
Ricardo Yuji Sado ◽  
Álvaro José De Almeida Bicudo
Keyword(s):  
Oreochromis Niloticus ◽  
Feed Efficiency ◽  
Nile Tilapia ◽  
Whole Body ◽  
Carnitine Supplementation ◽  
Body Protein ◽  
Nile Tilapia Oreochromis Niloticus ◽  
Randomized Experimental Design ◽  
Fat Level ◽  
Digestible Protein

The chemical composition of diets is appointed as one responsible by different results of L-carnitine supplementation in fish. This study determined the effects of digestible dietary protein (DP; 250 and 290 g kg-1) and crude fat (CF; 100 and 150 g kg-1) at levels of DL-carnitine supplementation (DLC; 0 and 1.0 g kg-1) in plant based-diets on growth and whole-body composition of Nile tilapia Oreochromis niloticus fingerlings (1.55 ± 0.03 g). Fish were hand-fed for 74 days, three times per day until apparent satiation, in a completely randomized experimental design, 2×2×2 factorial scheme (n = 3). There was no effect (P > 0.05) of DP, CF, and DLC, or interactions, on growth performance. There was a significant interaction between DP×CF; DP×DLC and DLC×CF on feed efficiency. There was interaction (P < 0.05) between CF×DLC on feed intake (DFI). The DLC supplementation in 100 g kg-1 CF diets increased DFI 5.6% more than fish fed with the same fat level without DLC. Whole-body protein decreased significantly due to DLC supplementation in fish fed with 150 g kg-1 CF diets. The level of DLC supplementation in Nile tilapia diets is variable and should consider the dietary CF levels, but not DP.

Challenge with fumonisins B1 and B2 changes IGF-1 and GHR mRNA expression in liver of Nile tilapia fingerlings

2018 ◽  
Vol 11 (2) ◽  
pp. 237-245 ◽  
Author(s):  
S.C. Claudino-Silva ◽  
B. Lala ◽  
N.H.A.P. Mora ◽  
C.R. Schamber ◽  
C.S. Nascimento ◽  
...  
Keyword(s):  
Weight Gain ◽  
Mrna Expression ◽  
Feed Intake ◽  
Oreochromis Niloticus ◽  
Feed Efficiency ◽  
Nile Tilapia ◽  
Growth Hormone Receptor ◽  
Control Treatment ◽  
Insulin Growth Factor ◽  
Nile Tilapia Oreochromis Niloticus

Although fumonisins are identified as responsible for alterations in weight gain, little information is available on their effects on expression of growth-related genes, especially for Nile tilapia (Oreochromis niloticus) fingerlings. In this study, Nile tilapia fingerlings were treated with increasing levels of fumonisin B1 (FB1) and fumonisin B2 (FB2) (diets of 0, 20, 40, and 60 mg/kg) to evaluate their effects on weight gain (WG), feed intake (FI), feed efficiency (FE), growth hormone receptor (GHR) and insulin growth factor 1 (IGF-1) mRNA expression in liver of this fish. All variables were evaluated at 15 and 30 days of treatment. Diet containing 0 mg fumonisin/kg was used as control treatment. Treatment with 20, 40, and 60 mg fumonisin/kg of diet significantly reduced WG (P<0.0001) and FE (P<0.0001), while GHR and IGF-1 mRNA expression was reduced both at 15 and 30 days of treatment. Feed intake was not affected by diets in any of the evaluated periods. These results indicate that fumonisins (FB1 + FB2) affect the growth of Nile tilapia fingerlings through mechanisms that involve reduction of GHR and IGF-1 expression.

scholarly journals Agonistic behaviour and feed efficiency in juvenile Nile tilapia Oreochromis niloticus

Aquaculture ◽  
2019 ◽  
Vol 505 ◽  
pp. 271-279 ◽  
Author(s):  
Hugues de Verdal ◽  
Catherine Maeve O'Connell ◽  
Wagdy Mekkawy ◽  
Marc Vandeputte ◽  
Béatrice Chatain ◽  
...  
Keyword(s):  
Oreochromis Niloticus ◽  
Feed Efficiency ◽  
Nile Tilapia ◽  
Agonistic Behaviour ◽  
Nile Tilapia Oreochromis Niloticus

scholarly journals Delivery of selenium using chitosan nanoparticles: Synthesis, characterization, and antioxidant and growth effects in Nile tilapia (Orechromis niloticus)

PLoS ONE ◽  
2021 ◽  
Vol 16 (5) ◽  
pp. e0251786
Author(s):  
Juliana M. Araujo ◽  
Rodrigo Fortes-Silva ◽  
Cícero C. Pola ◽  
Fernando Y. Yamamoto ◽  
Delbert M. Gatlin ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Antioxidant Activity ◽  
Controlled Release ◽  
Feed Efficiency ◽  
Nile Tilapia ◽  
Sodium Selenite ◽  
Chitosan Nanoparticles ◽  
Whole Body ◽  
Growth Responses ◽  
Body Protein

This study aimed to elucidate the effects of selenium-loaded chitosan nanoparticles used as a dietary supplement on Nile tilapia (Oreochromis niloticus) antioxidant and growth responses. First, chitosan-based nanoparticles containing selenium (Se) were synthesized using the ionotropic gelation method and their physicochemical characteristics, controlled release profile, and antioxidant activity properties were investigated. Thereafter, the effects on glutathione peroxidase and antioxidant activities (by radical scavenging activity), growth, and whole-body composition of Nile tilapia were evaluated when they were fed with Se-loaded chitosan nanoparticles and compared with other selenium dietary supplements. Se-loaded chitosan nanoparticles showed high entrapment efficiency (87%), spherical shape, smooth surface, and broad size distribution. The controlled release of Se consisted of an initial burst followed by a gradual release over 48 h. Se-loaded nanoparticles presented significantly higher antioxidant activity compared to free Se. A 60-day feeding trial was conducted to compare the effects of supplementing different dietary Se sources, including selenomethionine (as organic source), sodium selenite (as inorganic source), and Se-loaded chitosan nanoparticles (Se-Nano and Se-Nano x1.5) on antioxidant and growth responses of Nile tilapia. A basal diet without Se supplementation was used as the control. The dietary supplementations with different Se sources (free and encapsulated selenium) lead to significant improvements in final weight and feed efficiency of Nile tilapia fingerlings. However, dietary treatments did not affect whole-body protein and lipid content. Diets containing Se-Nano and Se-Nano x1.5 were more effective than sodium selenite and selenomethionine in preventing oxidative stress and improving antioxidant activity in Nile tilapia. Overall, Se-loaded nanoparticles presented a great potential as an efficient source for delivering dietary Se to Nile tilapia, directly affecting the growth performance, feed efficiency, oxidative stress, and antioxidant activity of this species.

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