Effects of feeding frequency on specific growth of tilapia (Oreochromis niloticus) fingerlings in hapa nets in fish ponds at in Kenya (original) (raw)
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Aquaculture, 1987
Young Nile tilapia (12 mg mean body weight and 11 mm total length) were stocked at a density of 5 fish/l in twelve 50-l aquaria filled with 30 1 of tap water. They were fed pellet crumbles containing 35% crude protein at various daily feeding rates expressed as percentages of fish biomass. Mean increases in body weight after 5 weeks were 63,198,232 and 228 mg for the 15,30,45 and 60% feeding rates, respectively, when ambient temperature ranged from 19 to 21 "C!. Corresponding survival rates were 53,85,87 and 84%. Growth and survival rates were enhanced significantly (PcO.01) at the 30,45 and 60% feeding rates. Two feeding trials were conducted to compare the growth and survival of fry fed pellet crumbles and an unpelleted form of the same diet. Results showed that growth and feed conversion were similar for both forms of diet. However, the survival rate of fry fed pellet crumbles was significantly higher (PC 0.01) than the survival rate of fry fed the unpelleted diet. Prior pelleting of the formulated diet for the tilapia fry given at 30% to 45% of fish biomass daily ensured high survival, fast growth and efficient feed conversion.
Performance of the nile tilapia with varying daily feeding amounts, using a commercial diet
Bioscience Journal, 2020
In order to evaluate the performance of Nile tilapia (Oreochromis niloticus), daily feeding amounts were varied in an experiment following a completely randomized design for 154 days and consisting of four treatments with three replications each, totaling 12 tanks with 3 m3 (3 x 1 x 1 m) of area each at densities of 5 fish m-3 (initial) and 3 fish m-3 until the end of the experiment. Throughout the experimental period, the daily amount of feed was varied and delimited for each feeding time (8h00, 11h00, 14h00 and 17h00) as: 25; 25; 25 and 25% in daily treatment 1 - T1; 20; 30; 30 and 20% in treatment 2 - T2; 30; 20; 20 and 30% in daily treatment 3 - T3; and 20; 30; 20 and 30% in treatment 4 - T4. Feed was offered six days a week, with extruded isocaloric (1,412 KJ) and isoproteic (32% crude protein) diets from 2 to 4 mm. Every two weeks, a sample containing 30% of stocked individuals was collected in each replication to monitor fish growth. Nile tilapia (O. niloticus) fed in daily a...
An experiment was conducted to evaluate the effects of feeding frequency on growth performance of O. niloticus fry, fed Raanan feed from Israel. The feed was given to the fry for a period of 21 days. The two feeding frequencies compared were eight times against continuous (frequent) feeding. Both feeding frequency experiments were carried out at both tank sites at Lake Harvest Bakerton Farm. Site A, the fry were stocked as 15000fry per tank (stocking density) and 10000 fry per tank at Site B (new site). Five replicates of each feeding frequency were employed at Site A and four replicates for each at Site B. Feed input was according to the Raanan feed chart. It was found that at 5% significant level using a t-Test for a definite increase, there was a significant growth performance for the continuous feeding regimen {P(X>2.132); X = 4.1716}. Also, a high significant growth performance was observed at 1% significant level {P(X>3.747); X = 4.1716} for continuous feeding at Site A. At Site B, it was found that there is no significant growth difference at 5% {P(X<2.353); X=2.058} between continuous and eight times feeding. Significant growth difference would rather be observed at 10% significant level {P(X>1.533)}.
Mediterranean Aquaculture Journal (Online), 2023
A factorial rearing trial 4x2 was done to investigate the compensatory growth of Nile tilapia (Oreochromis niloticus) in structural size and live weight in response to different deprivation periods and re-feeding. Four treatments were evaluated. The control group was fed to satiation two times a day and one-day starvation and re-feeding six days (1/6) throughout the experiment. The other three treatment groups were starved for 2, 3, and 4 days and re-feeding 7, 11, and 14 days, (2/7),(3/11), and (4/14) respectively. O. niloticus were constructed in this experiment with initial primary weights of 21.62 ± 0.08 g. Fish were randomly fed twice daily and starved for four days and were constructed for fourteen days in two replicates to assess the cost of feeding, growth performance, feed use, and survival rate for 84 days in 16 fiberglass tanks. The results showed that the best final body weight and feed conversion ratio in the feeding regime system was 3/11 compared to the control. Feed restriction significantly (P ≤ 0.05) reduced the cost of feed. The lowest feeding cost was obtained by O. niloticus fish starved for three days compared to starving for two days, four days, and control. The cost of feeding was reduced by 30% when the feeding was limited to three days starving and re-fed eleven days compared with those fed six days and starved one day.
Timing of the onset of supplemental feeding of nile tilapia (Oreochromis niloticus) in ponds
An on-farm trial was conducted in seven (7) farms in Nueva Ecija, Philippines, to investigate the effect of two onsets of feeding on the growth, yield and survival of Nile tilapia. There were no significant differences on the performance data (final mean weight, daily weight gain, extrapolated gross fish yield, and survival rate) that were recorded in this study. The only statistically significant difference observed was in the total quantities of feed used in the trial. The 45-day onset in feeding produced a slightly higher mean gross value of the crop (P205,617 ha -1 ) compared with the 75-day delay (P197,063 ha -1 ) but by delaying the start of feeding, the costs were reduced such that the net value of the crop was improved (P124,242 ha -1 in 75-day vs. P106,026 ha -1 in 45-day delay).
Feeding frequency is well known for the reduction of aquaculture production cost and preventing water quality deterioration as the result of excess feeding. The influence of feeding frequency was studied in the present study, when juvenile Nile tilapia Oreochromis niloticus (initial body weight 1.0 g) were maintained in rearing tanks 35 liters each (water temperature 29 o C, salinity 14‰, pH 7.7, dissolve oxygen 5.1ml/l and ammonia never exceeded 0.1 ml/l) and were fed diet of 35% protein for 42 days. Fish were fed at four frequencies: two, three, four and five times a day. Each feeding frequency was assigned to three tanks of fish with 10 fish per tank. Results showed that significantly higher weight gain, specific growth rate, feed conversion and protein efficiency ratio were observed at feeding frequency of four to five times daily. Moisture, protein and ash contents of whole body were not affected by feeding frequency. Lipid content of fish fed four and five times daily was significantly higher than that of the fish fed one and two times daily. The condition factor remained consistent at all feeding frequencies and survival was 100% throughout the experiment. These results suggest that under similar culture conditions, the optimum feeding frequency of juvenile Nile tilapia (from initial body weight of 1.0 g to 5.8 g) is four times daily.