Abstract: An open, continuous system for culturing Chaetoceros sp. microalgae includes a large outdoor container and full strength sunlight as a light source. The container is preferably a fiberglass tank having an open top, a diameter of approximately 18 inches, and a height of about 5 feet. The container holds a culture medium having the following characteristics: a carbon dioxide controlled pH of about 8.2, a starting nitrogen concentration of at least 3.0 mg N/liter, a starting phosphorous concentration of at least 2.75 mg P/liter, a starting vitamin B12 concentration of at least 5 micrograms/liter, a starting iron chloride concentration of at least 0.3 mg/liter, a starting copper sulfate concentration of at least 0.01 mg/liter, a starting silicate concentration of at least 10 mg SiO2/liter, and a Na2EDTA concentration of 5 mg/liter. The medium is inoculated with a seed stock of Chaetoceros sp. microalgae and exposed direct sunlight.

Abstract: The present invention relates to the use of extracts obtained from the marine algae Chaetoceros as antibacterially active agents and to compositions containing such agents for use against pathogenic bacteria. This invention also relates to a method of depurating an aquiculture using as a feed source the marine algae Chaetoceros.

Abstract: A land-based, closed facility for the production of bivalve mollusks in a fluidized bed using shrimp pond water. The facility comprises a vertical column built on a base tank that circulates shrimp pond water from a system of pipes. The shrimp pond water flows upward through the vertical column at specific intermediate velocities, allowing oysters in the column to be individually suspended in the fluid currents. The bed remains motionless relative to the column walls. At low velocities, the oysters in the vertical column lie on one another and on the bottom of the column, and at high flow velocities the fluid flow become a hydraulic transport, pushing the oysters out of the column. The column has a vertical viewing window. An overflow valve releases water from the column. Attached to the base tank is a site gauge to determine the pressure of the fluid supplied to the base of the column. The pipe carrying the shrimp pond water to the base tank has two shut-off valves.