Impact of stocking density on growth and production performance of monosex tilapia (Oreochromis niloticus) in ponds

Abstract

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.

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

“…Hossain et al (2003) found that ammonia (NH4) in different treatments is varied from 0.004 to 0.077 mg/L that was insistent to the findings of present study. Similar study were conducted by Samad et al (2016); Islam et al (2017); ; Shabuj et al (2016); Rahman et al (2015); Ali et al (2016b); Rahman et al (2016) and Anka et al (2016); their results were also similar. Nitrite can be associated with ammonia concentration in the water body.…”

“…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.…”

PRODUKTIVITAS PASCALARVA IKAN SEMAH Tor douronensis (Valenciennes, 1842) PADA LINGKUNGAN EX SITU DENGAN PADAT TEBAR BERBEDA

“…Padat tebar merupakan faktor penting yang harus dipertimbangkan dalam budidaya ikan. Beberapa studi telah mengevaluasi pengaruh padat tebar terhadap pertumbuhan dan metabolisme pada spesies ikan budidaya, terutama ikan-ikan lokal (Kusmini et al, 2017;Rahman et al, 2016;Prakoso et al, 2016;Joko et al, 2013;Li et al, 2012;dan Herrera et al, 2009). Kegiatan budidaya membutuhkan optimalisasi padat tebar sepanjang siklus hidup dari spesies yang dipelihara untuk menghindari aktivasi sistem stres dan konsekuensi kerugian ekonomi (Jia et al, 2016;Barton, 2002).…”