PadjadjaranUniversityBandung - Indonesia

• Phytoplankton and water sample were taken weekly at four chosen stations with different crowd levels of FCA• Phytoplankton data was analyzed by calculating the abundance, Simpson’s dominance index, Simpson’s diversity index and Sorenson similiarity coeficient. Ordination technique was used in order to see if there is a correlation between diversity index and different of crowd levels of FCA in each stations.

Organic input materials from fish feed residue, fecal

pellets and metabolism

Decomposition

Aerobic (NO3, PO4)

Anaerobic (CH4, H2S)

Changes in physical and chemical in water reservoir

Changes in community structure of

Phytoplankton

Fig. 1. Scheme of the problem approach

There is a positive correlation between the density FCA with abundance of phytoplankton in Djuanda reservoir. However, increasing density of FCA causes a decrease of diversity index of phytoplanktonFurther studies to determine the location, density, size or determining the amount of FCA based on the movement of water and bio-decomposition of bio-organic matter and also to study the carrying capacity the reservoir, especially related to sustainable aquaculture

Fiddy Semba Prasetiya Faculty of Science and Bio-engineering, ICP Ecological Marine Management

Vrije Universiteit Brussel, Campus Etterbeek, Pleinlaan 2, 1050 Elsene – Brussels, Belgiummail to: fsembapr@vub.ac.be Tel: +32485833827

Fig. 2. Map of Djuanda reservoir. Numbers represent the sampling sites where both of water and phytoplankton samples were taken

0.96%

2.08%

96.80%

0.16%

0%

Bacillariophyceae

Chlorophyceae

Cyanophyceae

Dinophyceae

Euglenophyceae

0.96%

2.08%

96.80%

0.16%

0%

Bacillariophyceae

Chlorophyceae

Cyanophyceae

Dinophyceae

Euglenophyceae

• 4 classes with 18 genera of phytoplankton were found Bacillariophyceae (5 genus), Chlorophyceae (8 genus), Cyanophyceae (3 genus), & Dinophyceae (2 genus) (Fig. 3)

Fig. 3. Percentage of phytoplankton based on the class form Djuanda reservoir

• Microcystis sp. has the abundance of 4428 ind/L

• Highest abundance of phytoplankton was found in station IV (Fig. 4)

Fig. 4 Abundancy of phytoplankton (individu/L) at 4 different sampling stations

• Relationship between different crowd levels of FCA were found with correlation coefficient value of – 0.835

• Relationship between different crowd levels of FCA were found with correlation coefficient value of – 0.835

The Effect of fish cage aquaculture on the community structure of phytoplankton

in Djuanda reservoir, West Java – Indonesia