Composition and abundance of phytoplankton in the rearing tank of elver eels stadia with a bio-floc system

Abstract

Abstract Bio-floc is a new technology used in fish farming systems, phytoplankton is one of the components in bio-floc so its existence is very important. The objective of this research is to study the composition and abundance of phytoplankton in the rearing container for the elver eel (Anguilla bicolor bicolor) bio-floc system. Observations were made on three eel rearing containers, as much as 1 liter of water was filtered using plankton net with 53 μm mesh size and preserved using Lugol’s solution. The parameters observed were the composition and abundance of phytoplankton, several environmental parameters were also analyzed to see their effect on phytoplankton. There were five classes of phytoplankton found, namely Bacillariophyceae (8 species), Chlorophyceae (9 species), Cyanophyceae (1 species), Dinophyceae (1 species), and Euglenophyceae (2 species), with the dominant species are Scenedesmus sp., Sphaerocystis sp., Oocystis sp., Gomphonema sp., Navicula sp., Rhopalodia sp., Synedra sp., and Aphanocapsa sp. The abundance values ranged from 1,785 to 925,250 individuals -1L. The composition and abundance of phytoplankton were influenced by phosphorus concentration.