Vaname shrimp is one of the Indonesian fishery commodities which is cultivated by applying a high stocking density of an intensive system. The application of high stocking densities can lead to an increase in artificial feeding and not all feed is eaten. The increase in organic matter and nutrients in the waters also increases the production of plankton, especially phytoplankton. This study aims to determine the composition of plankton in pond waters and the stomach or digestive tract of vannamei shrimp that are cultivated in ponds with a semi biofloc system. This study used a survey method and was statistically analyzed using Ms. Excel and Canonical Correlation Analysis (CCA). Parameters observed were the abundance and composition of phytoplankton and zooplankton in pond waters, the composition of phytoplankton and zooplankton in the stomach or digestive tract of shrimp, Ivlev selection index and water quality parameters. The results showed that the abundance and composition of the phytoplankton found in pond waters were Chlorophyta, Bacillarophyta, Cyanophyta, Charophyta and Dinoflagelata. The abundance and composition of the identified zooplankton consisted of Ciliophora, Rotifera and Arthropods. Meanwhile, in the stomach of the shrimp, the types of phytoplankton and zooplankton identified consisted of Chlorophyta and Cyanophyta and Rotifera. Based on the Ivlev selection index, the type of phytoplankton identified in the water and stomach is -1<E<0 and is an unpopular food for vannamei shrimp. While the Ivlev zooplankton selection index 0<E<1 is a food favored by vannamei shrimp. The results of the Canonical Correlation (CCA) analysis show that all water quality parameters correlate with the abundance and presence of plankton in the waters of vannamei shrimp ponds reared with a semi biofloc system. In particular, the abundance of Chlorophyta and Cyanophyta had a high correlation with DO, TOM and pH, while Bacillarophyta, Ciliophora, Dinoflagelata, Arthropoda and Rotifera had a low to high correlation with all water quality parameters. This shows that the abundance and presence of plankton in pond waters is needed to determine the level of water fertility and can also be used as natural food for shrimp

Litopenaeus vannamei, Zooplankton, Phytoplankton, Semi-biofloc and Ivlev Index