Fig. 3 (IMAGE) CNRS Caption Tanks (300-L 'minicosms') in which onboard experiments will be performed during the TONGA Project. Each tank will contain different mixtures of surface waters and hydrothermal fluids, to simulate the fertilising or toxic effects these fluids have on biological communities, and especially on phytoplankton. Credit © C. Guieu Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.