Effect of stocking densities on growth, production and survival rate of red tilapia in hapa at fish hatchery Chilya Thatta, Sindh, Pakistan

Abstract

Effect of stocking density on growth, production and survival of red tilapia (Oreochromis mossambicus × O. niloticus) 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: T1-200; T2-250 and T3-300 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 T1 (49.8±0.0 g) while in T3 lowest growth (29.09±0.0 g) was recorded. Production (9.56, 10.13 and 8.12 kg/m3/60days) in T1, T2 and T3 respectively were significantly different (P<0.05) to each other. Feed conversion ratio of 0.48, 0.48 and 0.49 in T1, T2 and T3, respectively not significantly different (P>0.05). Survival was significantly different among treatments (P<0.01). Highest survival (100%) was attained in T1 with lower stocking density, followed by T2 (98%) and T3 (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.

Effect of OxyAqua Organic Product on the Growth Performance and Survival Rate of Black Fin Seabream (Acanthopagrus berda) and Nile Tilapia (Oreochromis niloticus) Juveniles Reared in Seawater Cemented Cisterns

“…The survival ratio of fishes in this study were remained same (100%) in both treatments (T1 and T2) as also described by (Daudpota et al, 2014;Saeed and Al-Nagaawy, 2013;Maniruzzaman, 2001).…”

“…The water quality range in current study was suitable for the survival of Nile tilapia and seabream fish species and similar range were mentioned during the experimentation on hybrid red tilapia (Oreochromis niloticus × O. mossambicus) and Nile tilapia (O. niloticus) by Daudpota et al (2014, Shah et al (2014), Narejo et al (2003Narejo et al ( , 2005Narejo et al ( , 2010, and Malik et al ( , 2019. Although, Boyd (1990) reported that water quality especially adequate dissolved oxygen (DO) level also useful for oxidizing ammonia to nitrate and maintain the healthy pH level in water.…”

“…Fishes were fed supplementary diet at 2% of their total BW with the feeding frequency of thrice daily for 60 days. Similar feeding frequency have been observed for red tilapia (Hybrid) and Nile tilapia Oreochromis niloticus by (Daudpota et al, 2014;Malik et al, , 2019. Similarly, Rahim et al (2017) mentioned that juveniles that feed less i.e., one or two time instead of three times a day showed lower growth performance because sufficient feed is necessary to maximize the growth of juveniles.…”

Aloe barbadensis Effect on Growth Performance and Gastrointestinal Tract of Labeo rohita

“…A number of anatomical features determine the total absorptive surface area of the gastrointestinal tract. Taller, narrower, and regularly shaped villi and higher number of villi per unit area are indicators that the function of the intestinal villi is activated [32][33][34][35][36][37][38][39][40][41][42][43][44][45]; (Miles et al, 2006). In general, these villi provided large surface area for absorption of available nutrients [46][47][48][49][50][51][52][53][54][55][56][57].…”

Comparison of Water Quality Prediction for Red Tilapia Aquaculture in an Outdoor Recirculation System Using Deep Learning and a Hybrid Model

“…To achieve this, recirculating aquaculture systems (RASs) have been widely implemented in Europe and the USA, especially indoors [2]. Maintaining water quality is pivotal in these systems [3][4][5][6][7], necessitating the continuous monitoring of parameters such as dissolved oxygen (DO) levels, water temperature (Temp), acidity, alkalinity (ALK), water clarity, total ammonia nitrogen (TAN), and nitrite nitrogen (NO 2 -N). Measurements involve field equipment and laboratory assessments, often requiring chemicals, instruments, labor, time, and expenses [8].…”