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Studies on the Enrichment and Feeding Method of Microalgae in the Juvenile Breeding of Cyclina Sinensis

Author: SunXiangShan
Tutor: SunWeiMing
School: Chinese Academy of Agricultural Sciences
Course: Cultivation
Keywords: juvenile Cyclina sinesis culture microalgae concentrate use
CLC: S968.3
Type: Master's thesis
Year: 2011
Downloads: 29
Quote: 0
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Abstract


Cylcina sinensis is an emerging culturing seashell species, but it can not be cultured extensively in northern china subject to seed cultivation. The main problem is that the breeding of juvenile usually carried out in hot season. However, the culture of microalgae is very difficult in this period. The purpose of this research is to culture enough marine microalgae in spring or other spare time, and concentrate it with chemistry method, this way is high efficiency and lower cost. The concentrated microalgae are preserved to use as the main or partial food of juvenile in hot season, reducing the dependence on fresh microalgae. So the juvenile can grow up to a big size. This study compared the efficiency of five chemicals in concentrating four species of marine microalgae, and the effect of concentrated microalgae on the growth of juvenile. It indicated that only Platymonas subcordiformis suit to be concentrated by chemistry method and used as food of juvenile. The conclusion got from four following factors, easy culturing, nutrient-rich, efficiently concentrated and longer preserved period. The suitable chemicals and dosage to concentrate Platymonas subcordiformis are potassium permanganate 7-8mg/L and alum 180 mg/L. The concentrated Platymonas subcordiformis density achieved 4-6xl07 cell/ml, and the concentration multiple was 200～300 times. Without antifreeze, it could be preserved for 6 months in cold storage which temperature was-9～7℃. This study revealed the safety issues of concentrated algae that made by chemistry method and the relation with the mechanism of chemical reagents. Alum and polymerization aluminum chloride contain many aluminum ion which mixed in concentrated algae completely, so it had strong toxicity to juvenile. Polymerization aluminum chloride’s toxicity was stronger than alum for it contains more quantity of aluminum ion. Although the manganese dioxide hydrolyzed from potassium permanganate had certain toxicity, it displayed no toxicity to juvenile for the quantity mixed in concentrated algae was very few. This study also found that the aluminum ions could be eliminated from the juvenile body by metabolism, so proper control of intake could reduce the performance of poisoning. It shown that concentrated Platymonas subcordiformis using alum and potassium permanganate all suit to feed juvenile. But concentrated Platymonas subcordiformis using alum is not suitable for feeding juveniles under 1 mm for its toxicity. Mixed with fresh microalgae such as Isochrysis zhanjiangensis or Chaetoceros mueller, the concentrated microalgae can be used to feed the juvenile above 1 mm, but the quantity should not exceed 50% of the whole food. This percentage can be exceeded when the juvenile size is above 2 mm. Concentrated Platymonas subcordiformis using potassium permanganate has no toxicity, can be used to feed smaller juvenile, and the percentage can be increased. The effect of concentrated Platymonas subcordiformis on the weight growth rate of juvenile is very distinct. The rate reached 103.8% when the concentration was 50% of the total food for 7 days. The rate was more than 54% when the concentration was 75% of the food. When there were no fresh algae, the concentrated algae could maintain the growth rate to 35% at least. So the concentrated algae’s role of food security is very significant.

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CLC: > Agricultural Sciences > Aquaculture, fisheries > Aquaculture technology > A variety of seafood, animal and plant breeding > Shellfish farming
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