Thông tin chungTác giả/Author: Nguyen Thi Kim Van
Ngày phát hành/Issued date: 25/12/2018
Đơn vị phát hành/Issued by: Vietnam journal of agriculture and rural development
The control of environment and growth rate of phytoplankton are important factors in the success of intensive shrimp farming. Study on composition and population density of algae in the monoculture and polyculture of black tiger shrimp (Penaeus monodon) with milkfish (Chanos chanos) was conducted in Tra Vinh Province on four earthen ponds (2800-3000 m2). The results showed that there were 04 phyla was found in monoculture and polyculture of ponds. A number species and the percentage of Bacillariophyta was found 14 species (63.6%), Pyrrophyta 04 species (18.2%), Cyanobacteria 02 species (9.1%) and Chlorophyta was found 02 species (9.1%).The dominant algae in density was different between monoculture and polyculture ponds.In monoculture ponsthe Bacillariophyta (Chatoceros sp., Coscinodiscus sp.) and Cyanobacteria (Oscillatoria sp., Microcystis sp.) were dominant species, fluctuations density of Bacillariophyta 4,2 x 103- 3.1 x 105 ind/L, Cyanobacteria was the highest algae density 3,8 x 106 ind/L. A number species of Bacillariophyta (Coscinodiscus sp.) and Chlorophyta(Oocystis sp.) were dominantin polyculture pons, fluctuations density of Bacillariophyta and Chlorophyta were 4,2 x 103- 3.1 x 105 ind/L, 1 x 103 - 2.2 x 106 ind/L respectively.In this study shows that in the polyculture ponds of black tiger shrimp with milkfish, will be stabilize the density algae, cyanobacteria limited in the pond, improves water quality and survival of shrimp.
Key word: black tiger shrimp, algae, milkfish, polyculture, water quality, phytoplankton