TetraPond Wheatgerm Sticks During the colder periods of the year, the nutritional requirements of fish change slightly.In order to meet these needs, Tetra have developed Wheatgerm Sticks. These sticks contain all of the nutrients required by fish during the winter months , in a format that is easy to digest, and that will not sit in the gut like non-specialised feeds. By feeding fish during the winter, their energy reserves will not be depleted, and they will start the new season in much better condition. Continue feeding wheatgerm until the pond water stays above 10 degrees C.