The performance of seaweed Kappaphycus alvarezii and Kappaphycus striatum in tank culture system

Wahidatul Husna Zuldin, (2015) The performance of seaweed Kappaphycus alvarezii and Kappaphycus striatum in tank culture system. Masters thesis, Universiti Malaysia Sabah.

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Little is known on the performance of seaweed cultured in land-based facilities. The present study was conducted to determine the growth performance of Kappaphycus in tank and the effects of tank culture to the seaweed biochemical composition. Two tank culture systems were completed using circular and raceway tanks and three cultures of 40-days period were performed in each system. Red seaweeds, Kappaphycus alvarezii and Kappaphycus striatum were selected and cultivated in each tank culture system. Using circular tank, four different treatment tanks (Tl with only filtered seawater, T2 with fertilizer enrichment only, T3 with substrate addition only and T4 with the combination of fertilizer enrichment and substrate addition) were tested. In the circular tank culture system, both species were mutually cultivated via line culture method and the seaweed density was reduced accordingly in every culture (Culture 1: 2.40 g L⁻¹, 2: 1.92 g L⁻¹ and 3: 0.96 g L⁻¹ ). Using Two-way ANOVA statistical analysis, there were no significant differences between the between the factors tested (fertilizer enrichment and substrate addition) and the daily growth rate of Kappaphycus (p>0.05) in every culture with different seaweed density. The maximum daily growth rate was recorded in T4 with lowest seaweed density of 0.96 g L⁻¹ during Culture 3 on K. striatum (2.00±0.03% day⁻¹) and K. alvarezii (1.46±0.06% day⁻¹). In the second part of study, raceway tank was used and modified without any fertilizer enrichment and substrate addition needed. Both Kappaphycus were cultured using loose method in raceway tank. The results indicated that both Kappaphycus succeeded to grow with the highest average daily growth rate for K. striatum was 2.96±0.02% day⁻¹ and for K. alvareziiwas 2.13±0.03% day⁻¹ with zero nutrient or substrate enrichment during Culture 2. Kappaphycus striatum was found to grow well in both system compared to K. alvarezi. The results also showed that the biochemical composition of both tank cultured Kappaphycus were comparable with the open sea culture where the average percentage of crude protein, crude fibre and carrageenan content of the Kappaphycus cultured in the tank were fall within the range mentioned in the previous literature. Thus, tank culture system did not significantly affect the biochemical composition of the Kappaphycus. In conclusion, the success in cultivating Kappaphycus using circular and raceway tank indicated that seaweeds are highly potential to be cultivated in land-based facilities comparable with the open sea culture seaweeds. These findings are significant to provide a baseline data and facilitate seaweed research area especially for high quality seaweed seedling production in the future.

Item Type: Thesis (Masters)
Uncontrolled Keywords: growth performance, tank culture, seaweed
Subjects: S Agriculture > SH Aquaculture. Fisheries. Angling
Divisions: SCHOOL > Borneo Marine Research Institute
Depositing User: Munira
Date Deposited: 20 Nov 2017 02:15
Last Modified: 20 Nov 2017 02:15

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