METHOD AND APPARATUS TO DETERMINE ACTIVITIES OF A NATURAL AQUATIC POPULATION OF MICROSCOPIC ORGANISMS

摘要

A method and apparatus to determine biological activities of a natural aquatic population of microscopic organisms in which at least one container open at opposite ends is sunk in upright condition to a predetermined depth into a natural body of water, whereafter the opposite ends of the container are fluid-tightly closed so as to trap part of the water with the microscopic organisms contained therein in the container. A chemical is discharged into the water trapped in the container and the latter with its trapped contents is maintained for a predetermined time at the chosen depth. Subsequently, the container is raised and the contents thereof are discharged for analysis.