Effects of Protein Levels in Artificial Pellet Feed on Growth and Survival Rate of Black Apple Snail (Pila Polita)

Effect of stocking density of Snakeskin gourami (Trichopodus pectoralis) in polyculture system with Black apple snail (Pila polita)

“…Because of the golden apple snail, the competitor of black apple snail, therefore the stronger would be dominant. The results of this experiment show that the survival rate of snails is quite high compared to previous commercial culture studies, in which, the survival rate in the treatment of vegetable and artificial feed combination to cultured black apple snails reached 64.5% -71.9% (Binh and Thao, 2017b). According to Haque et al (2014), substrate played an important role in the growth rate and survival rate of freshwater snails in co-habitat with fish species, because of their helpful abilities such as creating a place for snails to cling to hide from enemies or rest, catching the feed supply from outside on the substrate, or enhancing the availability of natural food by improving the water quality and supplying dissolved oxygen.…”

“…According to Linh (2011), in the grow-out culture, the pH level ranged from 7.1 to 8.4, which did not affect to the growth rate of Pila polita. Snakeskin gourami also had the peribranchial organ which helped them survive in the eutrophication environment with the pH low around 4.5 to 5 (Biswas, 1993).…”

“…According to Binh (2011), the snail could grow well in the temperature range from 27 to 30 o C during the daytime. However, in other studies, the temperature for snails was 20 -32 o C, when the temperature drops below 15 o C or above 40 o C, snails switch to hibernation or aestivation (Lum-Kong & Kenny, 1989).…”

“…In addition, they also have the ability to live in an environment with a fluctuation of pH from 6 to 10.5 (Thao & Binh, 2018). Previous studies have identified a stocking density of 100 individuals/m² as optimal for commercial black apple snail farming (Dat, 2010;Binh et al, 2012). Binh and Thao (2017a) showed that a stocking density of 150 individuals/m² also ensures growth rates, survival rates, and economic efficiency for black apple snails.…”

“…In recent years, snail farming has been growing strongly, with the model of raising black apple snails in lined tanks bringing high economic efficiency to farmers (TSVN, 2021), because of the growing demand for snails because of their high nutrition and as one of the favorite foods of Vietnamese families. They are focused on by scientists; numerous studies on black apple snails have been conducted to better understand the reproductive characteristics, improve the quality of the seed, and enhance the quality of broodstock conditioning techniques (Roff, 1992;Cowie, 2002;Darby et al, 2008;Binh, 2011;Phuc & Chu, 2014;Thao et al, 2016;Binh & Thao, 2017b;Binh et al, 2022). There is a wide range of research on the combination of feed, optimal density, and suitable substrate for snails to improve the growth rate and enhance productivity (Thao et al, 2013;Swetha & Muthukumar, 2016;Thao et al, 2014;Thao, 2015).…”