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Kỷ yếu hội nghị quốc tế 2015
Số tạp chí (2015) Trang: 279
Tạp chí: 5th IFS 2015, The Gurney Hotel, Penang, Malaysia, 1-4 December 2015
Liên kết:

This study was conducted to determine effects of different pH on the flocculation ability of chitosan and utilization flocculated algae for feeding sweet snail larvae. In 1st experiment, Chaetoceros algae were flocculated by chitosan at three pH levels: non-change, 7 and 5. At pH 5, flocculation reached the highest efficiency (91%) after 4 hours. In 2nd experiment, flocculated algae were kept in temperature of 4oC in 15 days to determine the viability. At non-change pH treatment (pH= 9.3) Chaetoceros obtained highest cell viability (52.23%). After re-inoculation at initial density of 500,000 cells/mL, the highest cell density was obtained at day 15 in pH 7 (8,750,000 cells/mL). In 3rd experiment, flocculated algae were used for feeding sweet snail larvae in 20 days. Results showed that the shell length and height of larvae obtained highest values after 7 days with non-change pH (1094.40 and 852.77 µm, respectively). Highest survival rate was also recorded in this treatment (89.6 %). Our finding indicated the necessary to maintain pH values from 7,0-9,0 in order to gain the high algal cell viability after flocculation and effectiveness for feeding sweet snail larvae.

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