Growth evaluation of all male prawn and tilapia in ponds of northern Bangladesh

Abstract

Abstract:Freshwater aquaculture is by far the most ancient aquatic living resource production system known in the world. An experiment was conducted to evaluate the growth performance of prawn and tilapia (male) under different sex (male and female) contribution of prawn in polyculture ponds for a period of four months from September 2010 to December 2010. The experiment was designed with 3 treatments like T 1 (All male Tilapia-4938/ha + All male Prawn 19,753/ha), T 2 (All male Tilapia -4938 / ha + All female Prawn 19,753/ha) and T 3 (All male Tilapia -4938/ decimal + all male Prawn 19876 + all female prawn 19876/ha), each with 2 replications. The mean stocking weight of prawn was 2.87 g and that of tilapia was 37.36 g. Total stocking density of prawn and tilapia (24,691/ha), basal fertilization (Cowdung 2470kg/ha, Urea 50kg/ha and TSP 50kg/ha), periodic fertilization (Cowdung 50kg/ha/day, urea 1.25kg/ha/day and TSP 1.25kg/ha/day) and feeding regime (diet containing 30% protein level at the rate of 2-5% of prawn and fish body weight twice daily) were same for all the treatments. Water quality parameters (water temperature, transparency, dissolved oxygen, pH, NH 3 -N and alkalinity) were monitored fortnightly and the growth parameters were monitored monthly. Mean values of water quality parameters were found within the suitable range. Treatment T 1 varied more significantly (P<0.05) than that of others for the mean values of growth parameters (final weight, weight gain, SGR, survival rate and yield) of prawn and tilapia.

Effects of stocking density on the growth rate of gold fish fry reared in hapa

“…In the present study, nitrite concentration ranged from 0.01 mg/L to 0.03 mg/I, with the mean values of 0.013±0.01 mg/L, 0.01510.01 mg/L and 0.02710.01 mg/L, which was more or less similar to the findings of (Begum and Vijayaraghavan, 1999) who found that nitrite-nitrogen varied from 0.008 to 0.026 mg/L and 0 to 0.029 mg/L, respectively. Similar study were conducted by Samad et al (2016); Islam et al (2017); Rahman et al (2017); Rahman et al (2016) and Anka et al (2016); their results were also similar. In the present study, phosphate ranged from 0.6 to 1 mg/L which was more or less similar to the findings of Rahman (2003) who reported that PO 4 -P concentration varied from 0.78 to 2.5 mg/L in different treatments.…”

“…Kwiatkowski et al (2008), Kujawa et al (2010), Wolnicki et al (2009) A similar survival rate was observed by Daniel et al (2010) ranged from 76.9 to 90.0%. Similar study was conducted by Samad et al (2016); Islam et al (2017); Rahman et al (2017); Rahman et al (2016) and Anka et al (2016); their results were also similar. Survival rate was found to be relatively influenced by different stocking densities such as the lowest stocking density owed the highest survivability.…”

“…Kujawa (2004), Kwiatkowski et al (2008), recorded crucian carp body weight ranged 1.3 to 3.0 mg. Rcma and Gouveia (2005) recorded 0.9 mg of wet body weight of fish. Similar study was conducted by Samad et al (2016); Islam et al (2017); Rahman et al (2017); Rahman et al (2016); Anka et al (2016); Ali et al (2016); Zaman et al (2017) and Haq et al (2017); they got relevant results. It was observed that the highest weight gain of gold fish fry was obtained from anent T 1 which might be due to lower stocking density and lower competition for lowest weight gain was obtained from T 3 which might be due to comparatively her stocking density so the feeding competition may occur among the species.…”

Comparison of Controlled Nursery Rearing of Hybrid Tilapia Seeds in Different Culture System

“…The lower level of dissolved oxygen is found in the glass aquarium system, probably due to the lower level of temperature and no regular water circulation which may have formed more decompose due to these tanks may have used higher dissolved oxygen than hapa. This observation also reported by Ridha, 2004 andRahman et al, 2017.…”