Ảnh hưởng của nước thải từ ương tôm giống tới tỷ lệ sống, sinh trưởng và sinh sản của artemia

Abstract

     Artemia was cultured with four different treatments on the ratio of wastewater from shrimp seed production and clean water. Treatment 1: 100% waste water; Treatment 2: 25% wastewater and 75% clean water; Treatment 3: 50% wastewater and 50% clean water; Treatment 4: 100% clean water. The purpose of the study was to assess the effect of wastewater on survival, total length as well as reproduction characteristics of Artemia. From there, assess the possibility of raising Artemia biomass in wastewater from shrimp seed production. The results showed that the ratio of wastewater from shrimp seed production clearly affected on Artemia survival, total length and fecundity. After 14 days of culture, the survival rate, total length and fecundity were statistically significantly different among treatments (P<0.05). The highest survival rates, fertility and total length were 45.7 ± 5.36%, 62.2 ± 19.77 eggs/female, 8.1± 0.22 mm at 50% wastewater and 50% clean water treatment. The lowest survival rate was (24.9± 2.81%) in 100% wastewater treatment. The lowest fertility was 40.4 ± 17.44 eggs/female in 75% fresh water and 25% wastewater treatment. The lowest total body length of 6.9 ± 0.48 mm in 100% clean water treatment. However, the ratio of wastewater from shrimp seed production did not play a strong effect on Artemia growth rate, the percentage of females with cyst reproduction and no cyst reproduction. After 14 days of culture, the growth rate ranged from 0,04 to 0,04 %/day and the percentage of females with cyst reproduction and no cyst reproduction ranged from 56.7% to 76.7%, these both parameters were insignificantly different between the treatments (P>0.05). In general, Artemia could grow and reproduce in wastewater from shrimp seed production. In conclusion, the combination of 50% wastewater and 50% clean water for Artemia culture was the most suitable.

Keyword: Artemia, wastewater, shrimp seed