KARAKTERISTIK PERTUMBUHAN Tetraselmis sp. DAN Nannochloropsis sp.

Abstract

Monitoring of microalgae growth (Tetraselmis sp. and Nannochloropsis sp.) is one of the essential factors in fish and shrimp cultures. The purpose of this study was to determine the growth characteristics of Tetraselmis sp. and Nannochloropsis sp. by measuring optical density using spectrophotometry method. Absorbance of 600 nm was used for both species. The results showed that the maximum growth was achieved at day 6 for both microalgae with OD value of 1.734±0.013 and 1.329±0,002 for Tetraselmis sp. and Nannochloropsis sp., respectively. Tetraselmis sp. had a maximum growth rate of 0.74/day and doubling time of 22.43 hours while Nannochloropsis sp. had a maximum growth rate of 0.86/day and doubling time of 19.25 hours. This study shows that absorbance of 600 nm is suitable for determine the growth of green microalgae and spectrophotometry method can be used efficiently to monitor microalgal growth.