scholarly journals The Potential of Red Kwao Kreua (Butea superba) in Inducing Sex Reversal on Three Strains (Red, Ghana, Chitralada) of Nile Tilapia (Oreochromis niloticus L.) and the Effect of 17-α-Methyltestosterone (MT)

2007 ◽  
Vol 19 (3) ◽  
Author(s):  
K. MENGUMPHAN ◽  
Y. SAMITASIRI ◽  
R. CARANDANG, JR
Keyword(s):  
Sex Ratio ◽  
Nile Tilapia ◽  
Sex Reversal ◽  
Feed Conversion ◽  
Dosage Regimens ◽  
Nile Tilapia Oreochromis Niloticus ◽  
Significant Difference ◽  
Comparable Effect ◽  
Male Sex ◽  
Butea Superba

The present study aimed to investigate the potential of red kwao kreua and compare the effect between two MT dosage regimens in terms of inducing sex reversal, survival rate, feed conversion ratio and gain in weight on red, ghana and chitralada strains of Nile tilapia. Red kwao kreua, 100 g kg-1 , 200 g kg-1 and 300 g kg-1 , dried and pounded roots and 40 and 60 mg kg-1 MT were prepared and mixed per one kilogram fishmeal. Results revealed that MT treatments had a comparable effect in terms of male sex ratio, SR, FCR and GW and are statistically significant as compared to the control. Red kwao kreua treatments did not have significant difference with the control and with the MT treatments in some cases. However, a 72.2 + 25.5 % male sex ratio was obtained in treatment 3 of the chitralada strain. As to the effect of the treatments on the three strains it was observed that they generally have comparable effects.

scholarly journals Productive performance of Nile tilapia (Oreochromis niloticus) fed at different frequencies and periods with automatic dispenser

2012 ◽  
Vol 64 (1) ◽  
pp. 192-197 ◽  
Author(s):  
R.M.R. Sousa ◽  
C.A. Agostinho ◽  
F.A. Oliveira ◽  
D. Argentim ◽  
P.K. Novelli ◽  
...  
Keyword(s):  
Oreochromis Niloticus ◽  
Nile Tilapia ◽  
Productive Performance ◽  
Feed Conversion ◽  
Feeding Frequency ◽  
Nile Tilapia Oreochromis Niloticus ◽  
Significant Difference ◽  
Final Weight ◽  
Autumn And Winter ◽  
Feed Conversion Rate

The performance of Nile tilapia (Oreochromis niloticus) raised in cages furnished with an automatic dispenser, supplied at different frequencies (once per hour and once every two hours) and periods (daytime, nighttime and both) was evaluated. Eighteen 1.0m³ cages were placed into a 2000m² pond, two meters deep with a 5% water exchange. One hundred and seventy tilapias, with initial weight of 16.0±4.9g, were dispersed into each 1m³ cage and the feed ration was adjusted every 21 days with biometry. Data was collected from March to July (autumn and winter). Significant difference to final weight (P<0.05) among treatments was observed. The increase in feeding frequency improves the productive performance of Nile tilapias in cages and permitted better management of the food. The better feed conversion rate for high feeding frequency (24 times day-1) can result in saving up to 360kg of food for each ton of fish produced, increasing the economic sustenance for tilapia culture and suggesting less environmental pollution.

scholarly journals EFFECT OF REPLACING MUSTARD OILCAKE BY LINSEED OILCAKE ON GROWTH PERFORMANCE OF NILE TILAPIA (Oreochromis niloticus, Linnaeus, 1758)

2017 ◽  
Vol 22 (1) ◽  
pp. 10-16
Author(s):  
Suraj Babu Ghimire ◽  
Rahul Ranjan
Keyword(s):  
Growth Performance ◽  
Oreochromis Niloticus ◽  
Nile Tilapia ◽  
Linseed Oil ◽  
Daily Weight Gain ◽  
Average Weight ◽  
Feed Conversion ◽  
Fish Yield ◽  
Nile Tilapia Oreochromis Niloticus ◽  
Significant Difference

 This study was done to explore the effect of replacing mustard oilcake by linseed oilcake in feed on the growth performance of Nile Tilapia (Oreochromis niloticus). Mustard oilcake (MOC) was replaced by linseed oil cake (LOC) at three different level 0%, 50% and 100% to prepare three different types of diets. Diets were prepared with about 18% analyzed crude protein content. Fingerlings were kept in three happa with three replications for each diet in completely randomized design (CRD). Fish of average weight 5.31 g were stocked in happa having size 1.5m×1.5m×1.2m. The experimental fish were fed 3% of their body weight per day, once in the morning for five months continuously. No significant difference (p>0.05) in final mean weight, final total weight, average daily weight gain (DWG), survival rate, extrapolated gross fish yield (GFY), extrapolated net fish yield (NFY) and apparent feed conversion ratio (AFCR) among different treatments were observed. Hence, linseed oilcake can be used as the substitute in the feed of tilapia, if it is locally available.  Journal of Institute of Science and Technology, 2017, 22 (1): 10-16 

scholarly journals Feeding frequency on growth and male percentage during sexual reversion phase of Nile tilapia

2012 ◽  
Vol 13 (4) ◽  
pp. 1133-1142 ◽  
Author(s):  
Fábio Meurer ◽  
Robie Allan Bombardelli ◽  
Patrícia Santana da Paixão ◽  
Lilian Carolina Rosa da Silva ◽  
Lilian Dena dos Santos
Keyword(s):  
Sex Ratio ◽  
Nile Tilapia ◽  
Sex Reversal ◽  
Feeding Frequency ◽  
Randomized Design ◽  
Nile Tilapia Oreochromis Niloticus ◽  
Reversal Phase ◽  
Commercial Breeding ◽  
Suitable Index ◽  
Effect Of Feeding

The sex reversal is one of the most important stages for the commercial breeding of Nile tilapia in relation to the problems arising from early breeding of this species in cultivation tanks. The objective was to determine the effect of feeding frequency on growth and sex ratio of Nile tilapia (Oreochromis niloticus) during the sex reversal phase. Five hundred Nile tilapia fry were used and stocked in twenty-five plastic aquaria (36L) in a completely randomized design with five treatments and five replicates. The treatments were: one feeding (10h), two feeding (09h and 17h), three feeding (09h; 13h and 17h), four feeding (07h; 10h; 13h and 17h), and five feeding (07h; 09h; 11h; 15h and 17h). The feeding frequency affected sex ratio of male fingerlings, where the treatments with four and five feedings provided similar values, but higher (P<0.01) than other treatments. It is recommended feeding frequency at least four times a day to provide lots with suitable index of sex reversal for cultivation.

scholarly journals Comparative Study on Growth and Economic Performances of Nile Tilapia, Oreochromis niloticus Reared Under Different Culture Enclosures in Akure, Nigeria

2020 ◽  
Vol 20 (2) ◽  
pp. 91-98
Author(s):  
Oluwalola Oluwatuyi Ifedayo ◽  
Fagbenro Oyedapo Adewale ◽  
Adebayo Olabode Thomas
Keyword(s):  
Weight Gain ◽  
Oreochromis Niloticus ◽  
Nile Tilapia ◽  
Total Yield ◽  
Daily Weight Gain ◽  
Standard Diet ◽  
Feed Conversion ◽  
Nile Tilapia Oreochromis Niloticus ◽  
Significant Difference ◽  
Benefit Cost

This study was conducted to determine the growth and economic performances of Nile Tilapia Oreochromis niloticus reared in different culture enclosures in Akure. 900 O. niloticus fingerlings (mean weight 8.30±0.06g) were acclimatized for 24 hours, out of which one hundred fingerlings were randomly selected and distributed into the three prepared culture enclosures (plastic tanks, sandcrete tanks and earthen ponds) of the same size (3.0m X 2.8m X 1.0m). Each treatment was in triplicates. The fingerlings were fed with formulated standard diet of 30% crude protein at 5% body weight. Fish were fed twice daily for 185 days. The total yield of fish was significantly greater (P<0.05) in earthen pond, 1.93kg than those in sandcrete 1.47kg and plastic tanks 1.42kg. There was significant difference (P<0.05) in final weight gain, feed conversion ratio, mean daily weight gain between O. niloticus fingerlings stocked in the three culture enclosures. Fish in earthen pond had the highest weight gain (135.9g) and specific growth rate (1.54%). There was significant difference (P<0.05) in the Net profit obtained and benefit cost ration for the three culture enclosures. The study considered earthen pond to be more productive and the most ideal culture enclosure for growth optimization of O. niloticus.

scholarly journals Evaluation of pigeon pea (Cajanus cajan) as a substitute for soya bean meal in the diet of Nile tilapia (Oreochromis niloticus) fingerlings

2021 ◽  
Vol 30 (2) ◽  
pp. 265-270
Author(s):  
S. O. Obasa ◽  
A. A. Dada ◽  
W. O. Alegbeleye
Keyword(s):  
Soybean Meal ◽  
Oreochromis Niloticus ◽  
Cajanus Cajan ◽  
Nile Tilapia ◽  
Crude Protein ◽  
Pigeon Pea ◽  
Feed Conversion ◽  
Nutrient Utilisation ◽  
Nile Tilapia Oreochromis Niloticus ◽  
Soya Bean Meal

Pigeon pea (Cajanus cajan) meal was substituted for soybean meal in the practical diets for Nile tilapia Oreochromis niloticus fingerlings. Six iso-nitrogenous diets (35% crude protein) were formulated in which heat-treated soybean meal was replaced at varying levels (0, 20, 40, 60, 80 and 100%) with protein from pressure-cooked and sun dried pigeon meal (23% crude protein). Nile tilapia fed 60% pigeon pea meal had significantly (P<0.01) better growth response and nutrient utilisation. Growth was depressed in low pigeon pea fish and also in high (above 60%) pigeon pea diets. The poorest feed conversion ratio was observed from 100% pigeon pea fed fish.

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