Fresh Trace supplies a broad range of trace elements demonstrated* to be necessary for proper fish health and growth. Unlike terrestrial animals, fish obtain nutrients from both their food and environment. Trace elements are normally depleted by utilization, oxidation and precipitation, thus it is important to restore them on a regular basis. Fresh Trace contains only those elements actually demonstrated* to be required by fish. *Nutrient Requirements of Fish, National Academy of Sciences, pp. 16-21, 1993.