scholarly journals The Growth and Survival of Various Forms Androgen Sex - Reversal Oreochromis niloticus Cultured Using Hapas in Concrete Tank

2021 ◽  
Vol 5 (1) ◽  
pp. 1-5
Author(s):  
Omoike A ◽  
Keyword(s):  
Oreochromis Niloticus ◽  
Sex Reversal ◽  
Same Sex ◽  
Growth And Survival ◽  
Uniform Growth ◽  
Technological Means ◽  
Concrete Tank

The production of same sex Oreochromics niloticus to enhance better and uniform growth for Tilapia culture has called for technological means using sex-reversal hormones Methyl Testosterone (MT), this study will look into the percentage growth and survival of Oreochromics niloticus fry.

scholarly journals Growth and survival of tilapia Oreochromis niloticus (Linnaeus, 1758) submitted to different temperatures during the process of sex reversal

2009 ◽  
Vol 33 (3) ◽  
pp. 895-902 ◽  
Author(s):  
Cristina Delarete Drummond ◽  
Luis David Solis Murgas ◽  
Bruno Vicentini
Keyword(s):  
Weight Gain ◽  
Growth Performance ◽  
Oreochromis Niloticus ◽  
Hormone Treatment ◽  
Sex Reversal ◽  
Fish Culture ◽  
Growth And Survival ◽  
Gain Rate ◽  
Different Temperatures ◽  
Weight Gain Rate

The objective of this research was to evaluate the sex reversal technique using 17α--methyltestosterone (MT) hormone, submitted to temperature modification of fry Nilo tilapia storage, aiming to get the data of sex reversal combined with growth performance and fry survival. The experiment was performed at UFLA Fish Culture Station, using tilapia fry (0,008 ± 0.002 g e 0,9 ± 0.1 cm) obeying a totally randomized experimental delineation in a factorial scheme 4x4, in 4 temperatures (26º, 28º, 30º, 32ºC) and 4 hormonal doses (0, 20, 40, 60mg of MT/kg of ration) during 28 days, with 5 repetitions. As temperature raised, weight gain rate, size and survival increased (p<0.01); however, this temperature raise was not effective in modifying males ratio (p>0.01), which occurred only due to the used hormone treatment. The dose of 40 mg of MT/kg of ration provided similar results to those of 60mg of MT/kg of ration. Hence, the temperature band from 26º to 32ºC does not affect sex reversal rate, but temperatures around 30ºC improves the performance of tilapias related to the growth and survival, and the dose of 40 mg of MT/kg of ration is enough to achieve monosex populations.

scholarly journals Effect of isoproteinous feed on growth and survival of tilapia (Oreochromis niloticus) fry

2012 ◽  
Vol 10 (1) ◽  
pp. 169-174
Author(s):  
I Siddika ◽  
M Das ◽  
K R Sumi
Keyword(s):  
Wheat Flour ◽  
Rice Bran ◽  
Oreochromis Niloticus ◽  
Fish Meal ◽  
Cost Benefit Analysis ◽  
Cost Benefit ◽  
Meat And Bone Meal ◽  
Bone Meal ◽  
Growth And Survival ◽  
Significant Difference

A four week experiment was conducted to evaluate the effect of isoproteinous (35%) feed prepared named diet 1, 2, 3 and 4 respectively by substituting 0%, 50% , 75% and 100% fish meal with meat and bone meal in view of preparing a cost effective tilapia (Oreochromis niloticus) fry feed. The four experimental diets (diet 1 to 4) each were randomly assigned to twelve hapas with three replications. Tilapia fry (0.011g) were randomly stocked in 100 fry/9ft² hapa and fed five times a day up to their apparent satiation. The results of the study showed that the weight gain, specific growth rate (SGR), the apparent net protein utilization value and survival (%) of the fish were significantly  (P<0.05) higher and better feed utilization with lower FCR value was observed in fish fed on the diet 4 where meat and bone meal was used as sole source of protein base. There was no significant difference between the carcass moisture and lipid of fish fed with different experimental diets. The results of the study indicated that diet 1 containing fish meal (45.15% Fish meal, 27.43% Rice bran and 27.43% Wheat flour) can be replaced by meat and bone meal containing diet 4 (54.06% Meat and bone meal, 22.97% Rice bran and 22.97% Wheat flour) with no adverse effects on growth and survival of O. niloticus. Before recommendation several trials will be necessary in different farms to be  sure of the reproducibility of the result obtained in the present experiment. Cost- benefit analysis reveals that the   meat and bone meal containing diet certainly provides cheaper feed.   DOI: http://dx.doi.org/10.3329/jbau.v10i1.12110   J. Bangladesh Agril. Univ. 10(1): 169–174, 2012  

Crude glycerol in diets for Nile tilapia sex reversal (Oreochromis niloticus, Linnaeus 1758)

2015 ◽  
Vol 47 (8) ◽  
pp. 2682-2685 ◽  
Author(s):  
Fábio Meurer ◽  
Aldo Tovo Neto ◽  
Lilian Carolina Rosa da Silva ◽  
Luana Cagol ◽  
Marise Taise Theisen ◽  
...  
Keyword(s):  
Oreochromis Niloticus ◽  
Nile Tilapia ◽  
Crude Glycerol ◽  
Sex Reversal

scholarly journals Implications of dietary Delonix regia seed meal on growth, feed utilization, haematology and fillet yield of red Nile tilapia Oreochromis niloticus

2021 ◽  
Vol 12 (1) ◽  
pp. 140-154
Author(s):  
Saviour Isonguyoh Umanah ◽  
Gift Samuel David
Keyword(s):  
Survival Rate ◽  
Oreochromis Niloticus ◽  
Blood Parameters ◽  
Feed Utilization ◽  
Seed Meal ◽  
Red Tilapia ◽  
Delonix Regia ◽  
Significant Difference ◽  
Fillet Yield ◽  
Concrete Tank

Delonix regia is commonly called Flamboyant or flame of the forest. The seeds were fermented, boiled, sundried and then ground into powdered meal. 40% crude protein based test diets containing Delonix regia seed meal D0 = 0%; D15 = 15%; D20 = 20% and D25 = 25% inclusion levels respectively were prepared. Red tilapia (Oreochromis niloticus) fingerlings of 6 weeks old were acclimatized for two weeks and then stocked in 12 hapas at 15 fish per hapa measuring 0.6 m × 1.2 m × 0.7 m placed in a concrete tank. Each diet was assigned to fish in a separate hapa in triplicate and administered at 3% fish body weight per day for 16 weeks. Fish weight and length were taken initially, bi-weekly and terminally. Water quality was monitored weekly. Number of fish at the end was recorded and survival rate, growth, feed utilization, fillet yield and blood parameters were determined. The data were subjected to the analysis of variance and mean separation (P= 0.05). Survival rate was highest in fish raised on D20 and least in D25 without any significant difference across the range. Mean growth performances, feed utilization indices and fillet yield were generally congruent between D20 and D25 with varying degrees of significant difference to other feeds. Results of blood assay did not depict harmful effects of the test diets indicating that the fish enjoyed some good measures of health. The gross performance of fish on D20 was optimal. It was therefore concluded that 20% dietary inclusion level of fermented, cooked and dried flamboyant seed was the best for the red tilapia (Oreochromis niloticus) post fingerlings.

scholarly journals Effect of Red tilapia (Oreochromis mossambicus × Oreochromis niloticus) on growth and survival of the pacific shrimp (Litopenaeus vannamei) in simultaneous polyculture under marine conditions//Efecto de la tilapia roja (Oreochromis mossambicus × Oreochromis niloticus) en el crecimiento y supervivencia del camarón (Litopenaeus vannamei) en policultivo simultáneo bajo condiciones marinas

Biotecnia ◽  
2020 ◽  
Vol 22 (2) ◽  
pp. 5-12
Author(s):  
Alejandro Mcdonal-Vera ◽  
Wilfrido M. Contreras-Sánchez ◽  
Neil J. Duncan ◽  
Kevin Fitzsimmons ◽  
Maria J. Contreras- García ◽  
...  
Keyword(s):  
Litopenaeus Vannamei ◽  
Oreochromis Niloticus ◽  
Oreochromis Mossambicus ◽  
Pacific White Shrimp ◽  
White Shrimp ◽  
Average Weight ◽  
Growth And Survival ◽  
Red Tilapia ◽  
The Pacific ◽  
The Mean

In the present investigation, we evaluated if the presence of tilapia affects growth and survival of shrimp during pre-growth and grow-out phases. In both experiments, we used a random-blocks design in a single earth pond (0.75 ha) that was prepared and divided into nine (7 x 30 m) enclosures that were considered to be three blocks of three enclosures each. Each randomly stocked block consisted on Pacific white shrimp Litopenaeus vannamei (30 shrimp/m2) and three different densities (0.0, 0.25 and 0.50 fish/m2) of red tilapia hybrids (Oreochromis mossambicus x Oreochromis niloticus) to give three different treatments with three replicates. The results from the pre-growth and grow-out experiments followed the same trend. In both cases, we found no significant statistical differences (P>0.05) in the final average weight of the shrimp. However, the experimental blocks had a significant (P<0.05) effect on the mean sample weight of shrimp. Shrimp in blocks B and C were significantly bigger than shrimp from block A (P<0.05). For both experiments, we found no effect of the presence of tilapias on survival or growth of shrimp.RESUMENEvaluamos si la presencia de tilapias libres afecta el crecimiento y la supervivencia de camarones en fase de preengorda y engorda. Para ambos experimentos, utilizamos un diseño de bloques al azar en un estanque rústico (0.75 ha) que fue preparado y dividido en nueve encierros (7 x 30 m), se formaron tres bloques con tres encierros cada uno. Cada encierro dentro de cada bloque fue aleatoriamente seleccionado para sembrar camarón blanco del Pacífico, Litopenaeus vannamei (30 camarones/m2) y tres diferentes densidades (0.0, 0.25 y 0.50 peces/m2) de híbrido de tilapia roja (Oreochromis mossambicus x Oreochromis niloticus) para formar tres tratamientos con tres réplicas. Los resultados del experimento de pre-engorda y engorda siguieron la misma tendencia. En ambos experimentos no encontramos diferencias estadísticamente en el crecimiento de los camarones ni en las tilapias. Sin embargo, los bloques experimentales presentaron diferencias significativas (P<0.05) en el peso promedio final. Los camarones de los bloques B y C fueron estadísticamente más grandes (P<0.05) que los del bloque A. Para las dos etapas de crecimiento de los camarones, no se observó un efecto de la presencia de tilapias sobre la sobrevivencia o crecimiento de los camarones.

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