Influence of Temperature on Breeding of Tilapia ( Oreochromis Niloticus ) in the station of Fish Farming of Deroua, Beni Mellal/ Morocco (original) (raw)
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Fisheries and Aquatic Sciences
Small-scale fish farmers in developing countries are faced with challenges owing to their limited information on aquaculture management. Nile tilapia farmers in Teso North Sub-County recorded lower yields than expected in 2009 despite having been provided with required inputs. Water quality was suspected to be the key factor responsible for the low yields. This study sought to assess the effects of earthen pond water physico-chemical parameters on the growth of Nile tilapia in six earthen fish ponds under semi-intensive culture system in Teso North Sub-County. The study was longitudinal in nature with pond water and fish being the units of analysis. Systematic sampling was used to select five ponds while a control pond was purposively selected based on its previously high harvest. Four ponds were fed by surface flow and two by underground water. Each pond was fertilized and stocked with 900 fry of averagely 1.4 g and 4.4 cm. Physico-chemical parameters were measured in-situ using a multi-parameter probe. Sixty fish samples were randomly obtained from each pond fortnightly for four months using a 10 mm mesh size and measured, weighed and returned into the pond. Mean range of physico-chemical parameters were: dissolved oxygen (DO) 4.86-10.53 mg/l, temperature 24-26°C, pH 6.1-8.3, conductivity 35-87 μS/cm and ammonia 0.01-0. 3 mg/l. Temperature (p = 0.012) and conductivity (p = 0.0001) levels varied significantly between ponds. Overall Specific Growth Rate ranged between 1.8% (0.1692 g/day) and 3.8% (1.9 g/day). Ammonia, DO and pH in the ponds were within the optimal levels for growth of tilapia, while temperature and conductivity were below optimal levels. As temperature and DO increased, growth rate of tilapia increased. However, increase in conductivity, pH and ammonia decreased fish growth rate. Temperature and DO ranging between 27 and 30°C and 5-23 mg/l, respectively, and SGR of 3.8%/day and above are recommended for higher productivity.
2016
Stocking density is considered one of the important factors affecting fish growth. The study was aimed to compare the growth parameters of monosex tilapia at various stocking densities. The experiment was carried out during the period from 06 August to 22 December 2014. Three stocking densities were used as 125, 250 and 375 fish/dec and designated as treatment T 1 , T 2 and T 3 respectively each having two replicates. All the fishes were of same age group having average initial body weight of 1.34g. A commercial feed was supplied at the rate of 40% of the body weight and then gradually it was readjusted to 20%, 10%, 5% and 3% respectively and continued up to the end of the experiment. The water quality parameters were monitored at 14 days interval and the ranges were: temperature 19.34 to 31.40°C, pH 6.83 to 8.03, dissolved oxygen 4.78 to 6.82 mg/l and transparency 29.02 to 49.45cm.The result of the present study showed that the mean weight gain was significantly (P<0.01) highest in T 1 (120.58g) followed by T 2 (89.74g) and T 3 (74.58g).The average specific growth rates (SGR) was 2.590, 2.560 and 2.598 (%/day) in treatment T 1 , T 2 and T 3 respectively. There was significant (P<0.01) differences among the survival rate. The survival rate 87% was significantly highest in T 1 followed by 76% in T 2 and 69% in T 3 .The fish productions were 13.25, 17.30 and 19.64 kg/decimal in T 1 , T 2 and T 3 respectively. Although the highest production was obtained in T 3 but individually growth performance of monosex tilapia was highest in T 1. The highest net profit was found (BDT 3,373.30) inT 1 compared toT 2 (BDT 3,017) and T 3 (BDT 2,918). The highest benefit cost ratio (BCR) was 1.79 in T 1 followed by 1.44 in T 2 and 1.28 in T 3. Based on the result of present experiment, fish farmers might be suggested to rear tilapia at lower stocking density to get higher growth, survival and benefit in a short period of time.
International Journal of Sciences: Basic and Applied Research, 2017
This experiment was conducted to explore the effects of chemical and organic fertilizers at different levels of stocking density on the growth performance and yield of Nile Tilapia (Oreochromis niloticus (Linnaeus, 1758)) in earthen pond culture in southwestern Ethiopian highland located at an altitude of 1700 m above sea level. The ponds were divided into control and treatment with diammonium phosphate (DAP) and poultry manure application at three levels of stocking densities as 1, 2 and 3 fish m in a completely randomized design. All the experimental ponds had two replicates. The fertilizers were applied to the treatment ponds at a rate of 2 g m per week for 150 days. Juveniles with mean initial weight of 20.9 ± 0.19 g and mean initial length of 11.51 ± 0.16 cm were stocked. -----------------------------------------------------------------------* Corresponding author. International Journal of Sciences: Basic and Applied Research (IJSBAR) (2017) Volume 32, No 2, pp 80-94 81 The res...
Acta Scientiarum. Animal Sciences, 2013
Growth of Red, GIFT and Supreme Nile tilapia strains were evaluated. Fish were cultivated in indoor recirculation systems in 0.5 m³ tanks with controlled temperatures of 22, 28 and 30°C. Random samples of 20 fish from each strain (10 fish tank-1) were weighed at day 7, 30, 60, 90 and 120. Exponential model (y=Ae Kx) and Gompertz model (y = Aexp(-Be-Kx)) were fitted and the estimates parameters were obtained by Weighted Least Squares. At 22°C, Red, GIFT and Supreme strain presented similar growth and fit of exponential model. GIFT and Supreme strain presented higher growth rate at 30°C of cultivation when compared to Red strain. Temperature influences weight and age at the inflection point. The temperature of cultivation influences the growth description of Red, GIFT and Supreme tilapia strains. It changes the age and weight at inflection point and the qualities of growth model fits, changing the variation of the batch.
2012
The aim of this study was to describe the differences in Length-Weight relationship and condition factor of Tilapia zillii and Oreochromis urolepis urolepis reared in full strength sea water (FSSW) and fresh water (FW) ponds. The environmental condition in FSSW and FW ponds were also analyzed to determine their impacts on Length-Weight relationship and condition factor on both species. The regression coefficient "b" exhibit negative allometric growth in FW and positive allometric growth in FSSW for both species. The value of exponent "b" and condition factor (K) for T. zillii in FW and FSSW (in the bracket) were found to be 2.94 (3.3) and 2.07 (0.74) respectively. On the other hand the value of exponent "b" and condition factor (K) for O. urolepis urolepis in FW and FSSW (in the bracket) were found to be 2.81 (3.46) and 0.86 (0.53) respectively. Though both species performed well in FW, the study also revelead that farming of these tilapia species in FSSW can be feasible if water quality parameters are properly monitored.
2023
The present study was carried out to compare the normal aquaculture in earthen ponds and the recirculating aquaculture system (RAS) in the overwintering of juvenile Nile tilapia, Oreochromis niloticus during the winter season. The overwintering experiment was carried out in 3 earthen ponds, each of 1 feddan (as replicates of a control group), and 5 concrete tanks (3*8*1 m3 concrete tanks, as replicates of recirculating aquaculture system, RAS treatment group) at an intensive fish farm in EL-Hammoul province, Kafr EL-Sheikh Governorate, Egypt. The experiment extended from December 2019 to April 2020. Results showed that the highest values of final length, length gain, average daily length gain, final weight, weight gain, average daily weight gain and specific growth rate were recorded for fish fingerlings reared in the control earthen ponds. These growth performance parameters were significantly varied between all concrete ponds of the recycle aquaculture system (RAS) treatment and that of the control ponds. On the other hand, the best results of food conversion ratio, feed efficiency ratio, and protein efficiency ratio were estimated to fish reared in RAS treatment ponds. The mortality rate was very high for the control fingerlings where it reached 80.33%, while it recorded only 9.1% for RAS treatment fishes. The economic analysis showed a positive net income value for RAS treatment ponds and a negative net income value for earthen ponds. The present study recommended overwintering the fingerlings of the Nile tilapia, O. niloticus in RAS ponds with controlled water temperature to enhance the fish culture in Egypt and prevent the terrible mortality of fish.
ag.arizona.edu
The present investigation was carried out at Wady El-Rayan, Fayoum Governorate, Egypt in order to test the effects of initial weight and production cycle on growth performance and pond productivity of Nile tilapia (Oreochromis niloticus). The experiment was carried out in 6 earthen ponds each of a total area of two feddan (8400 m 2) where 2 ponds have been randomly allocated to each of the three treatments. The first two ponds (T 1) were stocked with Nile tilapia fry of an average initial weight of 1.3±0.0 g and cultured for 28 weeks. The second two ponds (T 2) were stocked with Nile tilapia fingerlings of 4.1±0.1 g cultured for 28 weeks, while the third two ponds (T 3 C 1) were cultured with Nile tilapia fingerlings of an initial weight of 11.6±0.15 g for 14 weeks. Then all fish of the last two ponds were harvested and there after the same ponds were restocked with Nile tilapia fingerlings of an initial weight (T 3 C 2) of 31.2±0.4 g and cultured for another cycle of 14 weeks i.e. from 8/07 to 14/10/2006. Results obtained are summarized in the following: 1-The highest initial weights were recorded by T 3 C 2 followed in a decreasing order by T 3 C 1 ; T 2 and T 1 respectively. 2-The highest final weight was obtained by T 2 then T 1 then significantly followed by T 3 C 2 and T 3 C 1. 3-The highest SGR and RGR values were recorded by groups T 3 C 2 followed in a decreasing order by T 3 C 1 ; T 1 and T 2 respectively with significant differences among groups. 4-Averages of daily weight gain (DWG) ranged between 1.3 g (T 2) and 2.91 g (T 3 C 2) with significant differences among groups and averages condition factor (K) ranged between 1.3 to 2.91% (T 3 C 2) with significant differences among groups. 5-Averages of final yield were found to be 6340.8; 6470.4; (4425.6 + 4790.4) kg for T 1; T 2 and for both (T 3 C 1 + T 3 C 2) during the whole culture season respectively. 6-Net returns recorded by T1; T2 and (T3C1 + T3C2) were 19543.4; 27488.5 and 35886.3 LE respectively, and net returns as percent of the lowest one (T1 100) were 140.65 and 183.62 for T2 and T3C1 + T3C2 together respectively.
This study was conducted to evaluate the interaction of dissolved oxygen, temperature and feed in fibre glass tanks of all male tilapia (Oreochromis niloticus). It was conducted between August 2017and February 20 18 at the Nigerian Institute for Oceanography and Marine Research Sapele out station Sapele. Nine circular fibre glass tanks were used in the experiment.All experimental tanks were identical in shape and size. Tanks capacities were 3.08m 3 and depth of 60.5cm each and diameter 176.78cm.Sex reversed Nile tilapia (Oreochromis niloticus) of 0.80g average size was stocked in triplicates. The treatments were dried chicken manure only, dried chicken manure plus commercial diet (coppens) and commercial diet (coppens) only as control.Three hundred (300) fish were stocked in each tank. Fish were fed at 800hr and 1600hr with dried chicken manure only, chicken manure wi th coppens and coppens only.. The feeding rate was 5% of the total fish biomass presented in each tank. Data collected were subjected to statistical test using analysis of variance (ANOVA).Test of temperature and dissolved oxygen were taken between 0800 to 1600 hour biweekly using (AMT08 PEN TYPE DO METER) according to Boyd (1992).Results indicated that ponds fed with coppens only performed better but not significant at (P<0.05). The regression equation also indicated that all the tanks are highly cor related and they interacted with each other, temperature also have effect on the dissolved oxygen in the fibre tanks.