Analysis of the Productivity, Immunity, and Health Performance of Nile Tilapia (Oreochromis niloticus) Broodstock-fed Dietary Fermented Extracts Sourced from Saccharomyces cerevisiae (Hilyses): A Field Trial

The present study aimed to evaluate the effect of dietary fermented extracts sourced from Saccharomyces cerevisiae (nucleotides, β-glucans and MOS) (Hilyses®) on the production and health of Nile tilapia (Oreochromis niloticus) broodstock, as well as on seed survival and performance. The trial was performed in a hatchery along the spawning season and continued in the laboratory to monitor the performance in fry and fingerlings. The broodstock were divided into two groups, (C) fed a basal diet and (H) fed 0.4% Hilyses. Blood and histological parameters, antioxidant power, cortisol level and the expression of some immune-related (TLR-2, IL-1β and TNF-α) and growth-related genes (MUC-2 and IGF-1) were measured. The obtained seeds were subdivided into four treatments: (C-C) fed a basal diet, (C-H) fed 0.4% Hilyses, (H-C) fed a basal diet and (H-H) fed 0.4% Hilyses. Results revealed that the dietary inclusion of Hilyses in the broodstock increased seed production, survival, hematological parameters, and antioxidant power. Moreover, it improved the intestinal microstructure and upregulated the immune- and growth-related genes. The growth indices of fry and fingerlings were significantly increased in all Hilyses-treated groups (p < 0.05). The performance in the (H-H) group significantly surpassed those of all groups. Therefore, dietary fermented yeast could be used as a strategic solution to sustain tilapia production.

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Effect of feeding frequency on water quality, growth, and hematological parameters of Nile tilapia Oreochromis niloticus reared using biofloc technology

Journal of Applied Aquaculture ◽

10.1080/10454438.2020.1715909 ◽

2020 ◽

pp. 1-15

Author(s):

Hamilton Hisano ◽

Victor Rossi Pinheiro ◽

Marcos Eliseu Losekann ◽

Mariana Silveira Guerra Moura e Silva

Keyword(s):

Water Quality ◽

Oreochromis Niloticus ◽

Nile Tilapia ◽

Hematological Parameters ◽

Feeding Frequency ◽

Nile Tilapia Oreochromis Niloticus ◽

Biofloc Technology ◽

Effect Of Feeding

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Optimal Replacement of Fish Meal Protein by Stick Water in Diet of Sex-Reversed Nile Tilapia (Oreochromis niloticus)

Animals ◽

10.3390/ani9080521 ◽

2019 ◽

Vol 9 (8) ◽

pp. 521

Author(s):

Uraiwan Wattanakul ◽

Wattana Wattanakul ◽

Karun Thongprajukaew

Keyword(s):

Oreochromis Niloticus ◽

Nile Tilapia ◽

Fish Meal ◽

Specific Activity ◽

Hematological Parameters ◽

Dietary Treatment ◽

Normal Liver ◽

Carcass Quality ◽

Liver Histopathology ◽

Nile Tilapia Oreochromis Niloticus

The effects of replacing fish meal (FM) protein with stick water (SW) were investigated during the market stage of sex-reversed Nile tilapia, Oreochromis niloticus (18.49 ± 0.31 g initial body weight). The FM protein was replaced with SW for 10% (10SW), 20% (20SW), 30% (30SW) and 50% (50SW) of the FM. The completely randomized design was conducted in outdoor 15 floating baskets (1.5 × 1.5 × 2 m), comprising three replications with 50 fish each, over an 8 month trial. At the end of the experiment, no differences in survival, growth performance or feed utilization were observed across the dietary treatments (p > 0.05). A significant change in lipase-specific activity was caused by the replacement, without changes to trypsin, chymotrypsin or amylase activities. The fish in all dietary groups exhibited normal liver histopathology, but the fish fed a diet containing SW showed higher numbers of cells accumulating lipids as compared to fish fed the baseline 0SW dietary treatment. Hematological parameters were similar across the five dietary groups. Only fish fed the 20SW diet had superior carcass quality compared to the baseline 0SW group, in terms of crude protein and lipids, but lower or higher replacement levels had negative effects on carcass quality. Findings from the current study support the replacement of FM protein with SW at a level of 20% in the diet of sex-reversed Nile tilapia reared to the market stage. Higher replacement levels might be possible with the supplementation of fatty acids.

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Physiological and hematological responses of Nile tilapia (Oreochromis Niloticus) to different anesthetics during simulated transport conditions

Acta Scientiarum Technology ◽

10.4025/actascitechnol.v38i3.28377 ◽

2016 ◽

Vol 38 (3) ◽

pp. 301 ◽

Cited By ~ 6

Author(s):

Rodrigo Diana Navarro ◽

Rafael Paiva França ◽

Giane Regina Paludo ◽

Yvonaldo Wlademir Saldanha Bizarro ◽

Rodrigo Fortes da Silva ◽

...

Keyword(s):

Oreochromis Niloticus ◽

Nile Tilapia ◽

Survival Rates ◽

Physiological Limits ◽

Live Fish ◽

Nile Tilapia Oreochromis Niloticus ◽

Polyethylene Bags ◽

Baseline Values ◽

And Performance ◽

Higher Doses

Minimization of stress during the transportation of live fish is essential in maintaining the welfare and performance of the animals. In order to test the hypothesis that stress during transport of fingerlings of Nile tilapia (Oreochromis niloticus) can be reduced with the aid of the anesthetics menthol, eugenol or benzocaine, we have assessed the effects of these agents at various concentrations on the physiological parameters and survival rates of fish subjected to conditions simulating those normally used in transportation. Fingerlings (N = 1200) were fasted for 24 hours and distributed in 20 L polyethylene bags (N = 50 per bag) containing 5 L of water and an anesthetic at the appropriate concentration. Fingerlings treated with menthol at 75 mg L-1, or eugenol or benzocaine at 20 mg L-1, maintained levels of plasma cortisol and glucose that were lower than those of the stressed but untreated controls and within the physiological limits of the baseline values for this species. Under these conditions, the survival rate was 100%, suggesting that stress was substantially reduced despite dense consignment. Treatments involving higher doses of the studied agents induced significant anesthetic toxicity.

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