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

Abstract

Abstract: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 T 1 (10 fry/hapa), T 2 (15 fry/hapa) andT 3 (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 o C, dissolved oxygen 3.68 to 4.09 mg/L, p H 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 T 1 resulted the best mean final weight gain (1.188 g) followed by T 2 (0.834 g) and T 3 (0.686 g). The SGR ranged between 6.64 and 7.43% per day and FCR ranged between 3.56 and 4.12 with T 1 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.

Effect of water parameters on temporal distribution and abundance of zooplankton at Kaptai lake reservoir, Rangamati, Bangladesh

“…Only in winter months, sometimes morning fog and heavy dew were observed and in monsoon, occasionally gusty wind prevails in this area (Akther, 2018). The maximum air temperature (27.50±0.70C) in pre-monsoon and water temperature (31.5±0.80C) in monsoon was recorded while minimum air temperature (21.00±1.30C) in post-monsoon and minimum water temperature (23.5±1.50C) in post-monsoon was recorded and similar season wise temperature change observation was conducted by Zafar et al, (2017) and Shajib et al, (2017). Air temperature in the study area was found always higher than water temperature except in a few cases.…”

Growth and economic performance of different supplementary feed on female mud crab (Scylla olivacea) fattening in plastic box

“…In the experiment water parameters, such as pH, temperature, salinity and DO were varied from 7.7-8.1 28.4-32.7°C, 17.1-19.3 ppt and 7.7-8.3 mg/L respectively which is acceptable range for crab fattening according to Cholik and Hanafi (1992) and showed similarity with Begum et al, (2009). The water quality management is also supported by the study of different researcher (Ali et al, 2016;Shabuj et al, 2016;Shajib et al, 2017;Zafar et al, 2017;Rahman et al, 2018;Akter et al, 2018;Faruk et al, 2018;Biswas et al, 2018;Billah et al, 2019).In the present experiment, 100% survival was obtained for crabs fed with Chicken intestine and Apple snail meat. The other feeds had lower survival rate and it was 90%.…”

Feeding frequency on the growth and production of endemic near-threatened Ompok pabda (Hamilton 1822) in pond setup

“…The maximum value was recorded with the T 1 in the fourth months. Samad et al (2021) suggested the temperature in the culture setup were 28.50°C among the treatments while Nahar et al (2021) found temperature fluctuated between 25.01 and 26.13°C; on the other hand Shajib et al (2018) showed the temperature could be ranged between 25.25 and 27.50 °C in hapa set up was found to be suitable for fish growth, as better weight gain and lower FCR were recorded during this period. The amount of dissolved oxygen in water is another key water quality characteristic that fish rely on to survive (Makori et al, 2017).…”