Knowing where the best fishing zones are located is an art form. Part of the picture is made up of oceanographic forecasts. Inside TZ Professional v3, there are numerous forecasts such as Altimetry, Geographic currents, SST and Plankton/Chlorophyll.
Phytoplankton are the base of the ocean food. They are single cell organisms that use chlorophyll within their cells to carry out photosynthesis, the process of generating energy from light. Phytoplankton are dependent not only on sunlight but nutrients and temperature. As colder waters tend to have more nutrients such as nitrates, phosphates and sulfur that can be converted into proteins, fats, and carbohydrates, phytoplankton tend to be found in larger numbers around the polar regions and in areas where the ocean currents bring cold water towards the surface.