scholarly journals Integrated multi-trophic culture of Nile tilapia (Oreochromis niloticus) and Amazon river prawn (Macrobrachium amazonicum) in brackish water

2015 ◽  
Vol 67 (1) ◽  
pp. 265-273 ◽  
Author(s):  
G.G. Henry-Silva ◽  
C.S.P. Maia ◽  
R.S.T. Moura ◽  
A.P. Bessa Junior ◽  
W.C. Valenti
Keyword(s):  
Brackish Water ◽  
Oreochromis Niloticus ◽  
Nile Tilapia ◽  
Survival Rates ◽  
Stocking Density ◽  
Control Treatment ◽  
Amazon River ◽  
Nile Tilapia Oreochromis Niloticus ◽  
Macrobrachium Amazonicum ◽  
Total Fish

The aim of this study was to assess the feasibility of integrated multi-trophic culture of Nile tilapia (Oreochromis niloticus) and Amazon River prawn (Macrobrachium amazonicum) in brackish water by evaluating its limnological characteristics and economic performance. The experiment was completely randomized with four treatments and four repetitions: control treatment with Nile tilapia only, stocked with 2 tilapias/m² (P2C0) and three integrated multi-trophic culture treatments stocked with 2 tilapias/m² and prawns at densities of 4, 8 and 16 prawns/m² (P2C04, P2C08 and P2C16, respectively). The limnological variables of temperature, pH, dissolved oxygen, turbidity, ammonia, orthophosphate and chlorophyll "a" were evaluated and throughout the experiment remained within the limits recommended for culture. The experiment lasted 150 days with monthly animal sampling. No significant differences were observed for total fish biomass or for fish and prawn total survival rates. However, prawn individual weight decreased as stocking density increased. Gross revenue was not significantly different between treatments, as well as profitability. The profitability was 40.1% (P2C0), 36.7% (P2C04), 41.2% (P2C08) and 50.1% (P2C16). It is concluded that although feasible from the view point of husbandry, the integrated multi-tropic culture of M. amazonicum and O. niloticus did not influence significantly profitability compared to the monoculture system.

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

2016 ◽  
Vol 38 (3) ◽  
pp. 301 ◽  
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. 

Sign in / Sign up

Export Citation Format

Share Document