Effect of Stocking Density and Rearing Facility on Growth and Profitability of Tilapia rendalli Fry (original) (raw)
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International Journal of Biological Innovations, 2022
This study was intended to assess the comparative growth and production performance in relation to different stocking densities to have better understanding on the consecutive growth 3 trends. Tilapia (Oreochromis niloticus) fry was released at the rate of 8 fry per tank (1m) as per the recommended stocking density of 320 fishes/decimal and 4 fry per tank equivalent to the stocking density of 160 fishes/decimal in intensive (T) and semi-intensive (T) aquaculture system, 1 2 respectively. Floating feed was used to evaluate the growth performance during the experimental period for T and T , respectively. There were six replications for each treatment. The feed was 1 2 supplied at the rate of 20%, 15%, and 10% of the body weight during the study period of 90 days. The weight gains of fish were 132.23±1.29 and 63.12±4.97g for T and T respectively. Feed conversion 1 2, ratio (FCR) in T and T were 2.43±0.18 and 2.13±0.20, respectively. Higher total production was 1 2 obtained in T (1119.52 g) than T (830.96 g) with 100% survival in both the treatments. The present 1 2 study indicates that, the production performance acquired higher in T having significant difference 1 compared to T and the intensive culture of Tilapia is more rational for getting more production in 2 relation to semi-intensive culture.
Effects of stocking density on the growth rate of gold fish fry reared in hapa
2017
The present study was conducted to investigate effects of stocking density on growth performances of gold fish (Carassius auratus) in hapas. Experiment was conducted for a month with three treatments where three stocking densities were T1 (10 fry/hapa), T2 (15 fry/hapa) andT3 (20 fry/hapa) each having three replications which were selected randomly. In the present experiment hapa (3ft × 2ft × 2ft) with 1 mm mesh net was used. Gold fish fry having a mean body weight of 0.007 g were used in all treatments. Fishes were fed at the rate of 10% of their body weight containing 34.11% protein. Water quality parameters were monitored at 10 days interval and the ranges were –temperature 24.75 to 27.75 oC, dissolved oxygen 3.68 to 4.09 mg/L, pH 7.3 to 8.16, ammonia 0.3 to 1 mg/L, nitrite 0.01 to 0.03 mg/L, phosphate 0.6 to 1 mg/L and alkalinity 119 to 187 mg/L. At the growth performances were evaluated by comparing mean final body weight, specific growth rate and food conversion ratio. The present study showed that the gold fish fry in T1 resulted the best mean final weight gain (1.188 g) followed by T2 (0.834 g) and T3 (0.686 g). The SGR ranged between 6.64 and 7.43% per day and FCR ranged between 3.56 and 4.12 with T1 showing the lowest FCR. The survival rate (%) ranged between 76.67% to 85.67%. From the present experiment it was found that individual fish growth rate was decreased with the increase of stocking density.
Citation: Daudpota AM, Kalhoro IB, Shah SA, Kalhoro H and Abbas G (2014) Effect of stocking densities on growth, production and survival rate of red tilapia in hapa at fish hatchery Chilya Thatta, Sindh, Abstract Effect of stocking density on growth, production and survival of red tilapia were conducted in hapa for 60 days at Chilya Thatta. Tilapia fry (4.5±0.02 cm, 2.0±0.01 g) were stocked into hapa (4.5x2.4x1 m). Three treatments with two replicates were used: T 1-200; T 2-250 and T 3-300 fry/hapa. Fry were fed twice a daily with pelleted feed containing 35% protein, 5% of total biomass. After 60 days, the highest growth were determined in T 1 (49.8±0.0 g) while in T 3 lowest growth (29.09±0.0 g) was recorded. Production (9.56, 10.13 and 8.12 kg/m 3 /60days) in T 1 , T 2 and T 3 respectively were significantly different (P<0.05) to each other. Feed conversion ratio of 0.48, 0.48 and 0.49 in T 1 , T 2 and T 3 , respectively not significantly different (P>0.05). Survival was significantly different among treatments (P<0.01). Highest survival (100%) was attained in T 1 with lower stocking density, followed by T 2 (98%) and T 3 (95%). Water quality parameters recorded throughout the study period were found within the ranges for fish culture such as temperature 27.2 to 28.5 °C, dissolved oxygen 5.8 to 6.4 mg/l, pH 6.9 to 7.6, ammonia from 0.45 to 0.51 mg/l, hardness 106 to 110 ppm and nitrite 0.151 to 0.162 mg/l.
A one month trial of sex reversal treatment of O. niloticus fry of varying stocking densities was performed in hapas-in-pond to determine the growth performance characteristics and profitability. Larvae were selected, collected, weighed and stocked inside a 10.0 m 2 hapas in a 0.2 ha pond with stocking densities of 10000 (A), 15000 (B) and 20000 (C). Each stocking were made in triplicate. Fry were fed with a 36% crude protein plus hormone incorporated feed five times a day. Weekly samplings of fry were done including water quality parameters. Final average body weights of treated fry were 0.226 ± 0.02, 0.125 ± 0.02 and 0.080 ± 0.01 g for treatments 'A', 'B', and 'C' stocks respectively. The fry growth in treatment 'A' was significant (at p < 0.05) among all other stocks. It also exhibited high specific growth rate and a lower feed conversion rate than others; however, high survival was achieved with fry in treatment 'B'. High value of fry crop was achieved in treatment 'C' with a value of GH¢ 638.96. Although profit index did not vary significantly from each other, the treatment 'B' reached the highest value of 23.13 ± 9.01. The increasing fry stocking density of fry significantly affected the growth and feeding conversion rate, however, it did not affect the survival data. Due to the high profit index, relatively high growth rate and high survival, treatment 'B' is recommended for fry rearing in a 10.0 m 2 hapa-in-pond system.
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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.
The effect of stocking density on growth performance, production and survival of Pangas, Pangasius hypophthalmus were evaluated in cemented tanks. Fry of Pangas (1.52 ± 0.03 cm in length and 1.08 ± 0.02 g in weight) respectively were stocked into cemented tanks measuring 15 x 6 x 3 ft. Three treatments with two replicates were used: T 1-100; T 2-150 and T 3-200 fry/ tank. Pangas fry were fed twice daily with formulated feed 35 % protein at 10%, 5%, and 3% body weight for the first, second, and third month, respectively. After 90 days, the Highest growth performances (determined in terms of average weight) were recorded in T 1 (27.5±2.5 g) and T 2 (22.4±2.8 g) while T 3 (18.2±3.5g) recorded the smallest growth. Production differed significantly among treatments (P<0.05). Feed conversion ratio (FCR) of 1.0, 1.02 and 1.05 in T 1 , T 2 and T 3 , respectively were not significantly different (P>0.05). Survival was significantly different among treatments (P<0.01). Highest survival (100%) was attained in T 1 with lower stocking density, followed by T 2 (96%) and T 3 (90%). Survival was greatly influenced by the stocking densities in all treatments. The water quality parameters and their monthly fluctuations recorded throughout the study period were found within the suitable ranges for the fish culture such as temperature 27.0 to 28.7 °C, dissolved oxygen 5.7 to 6.2 mg/lit, pH 7.2 to 7.5, Ammonia from 0.45 to 0.51mg/L, Hardness 105 to 110 ppm and Nitrite 0.152 to 0.161 mg/L.
2021
The stocking density is considered one of the most critical factors that affects the growth performance and production as well. The study was aimed to compare the growth parameters of tilapia at different stocking densities. The growth performance usually considered as the data of the beginning and the end of production cycle avoiding intermediary data for the measurement is highly criticized by the scholars due to the abjection of the accuracy. However, the utilization of floating feed by fish can be acquainted addressing the growth performance at different stages of fish growth. To evaluate the growth performance, the study was conducted in twelve concrete tanks under an outdoor laboratory shed from 10th May to 29th July, 2017. Tilapia (Oreochromis niloticus) fry was released at the rate of 8 fry per tank as per the recommended stocking density of 320 fishes/decimal and 4 fry per tank equivalent to the stocking density of 160 fishes/decimal in intensive semi-intensive aquaculture system, respectively. To evaluate the growth performance floating feed was used for feeding the fish during the experimental period for T1 (Intensive) and T2 (Semi-intensive), respectively. Each with three replications at the rate of 20%, 15%, and 10% of the body weight feed was supplied in 1st, 2nd and 3rd month, respectively. The daily ration of feed was delivered to fish in the morning and at the evening dividing into two parts. Aeration facilities using air stone aerator were installed for 24 hours. The weight of fish was recorded using digital balance in 3 days interval to assume the trend of consecutive growth of fish while a customized scoop net was used to sample the fish. Water quality parameters i.e., temperature and dissolved oxygen (DO) were recorded two times (morning & evening) daily. The weight gains of fish were 132.23±1.29 and 63.12±4.97gm for T1 and T2, respectively. The mean percent weight gain of tilapia was higher in T1 (1715.05±0.00) than T2 (747±0.00 gm). Feed conversion ratio (FCR) in T1 and T2 were 2.53±0.18 and 2.13±0.20, respectively. The specific growth rates (SGR) of tilapia in T1 6.26.98±2.28 and 4.78±3.83 considering the data at the beginning and the end of the production cycle, respectively. However, the growth performance and SGR was higher at the initial stage of production cycle and lower in the later stages. Higher total production was obtained in T1 (1119.52 g) than T2 (830.96 g) with 100% survival in both the treatments.
2015
The present study was carried out at the Mariculture research center (M.R.C.) of the Suez Canal University, EL-Arish, North Sinai, Egypt. It aims to evaluate the feasibility of Red Tilapia culture in salt water. Effect of feeding levels and feeding regimes on growth performance and feed utilization of Red Tilapia fingerlings. Three feeding levels (2, 3 and 4% of total fish biomass) and within each feeding level two feeding frequency (4 times/day and 6 times/day). The fish had an average initial weight of 5.50 g and 32% crude protein were tested .The results showed that: The fish fed on 4% feeding levels from total fish biomass and 4 times /day have the heaviest final body weight (29.68+4.35 g) and have a daily weight gain and specific growth rate of 0.28+0.05 (g/fish/day) and 1.98+0.16 (%/day) , respectively.