Gravel chub silt and debris. They are more often found in areas with limited macrophytes and larger root aquatic plants, algae and moss. Because of their need of a specialized clean habitats, the gravel chub is especially vulnerable to various forms of pollution, especially from agriculture practices that create erosion and excessive silt. In past sampling surveys the gravel chub had been found as far north in the Upper Iowa River as Le Roy, Minnesota, but because of excessive amounts of sewage, pesticides and sedimentation of rocks and sand, this is no longer the case. The presence of gravel chubs in a
Granular cheese content is 39 percent, and the minimum allowed milkfat content is 50 percent by weight of the solids. Regular granular cheese must either use pasteurized dairy products or be cured for at least 60 days at a temperature of at least 35 °F. Either cows' milk or cream may be used as the main ingredient. Other permissible ingredients include clotting enzymes such as rennet, coloring, calcium chloride as a coagulation aid, enzymes used in curing, hydrogen peroxide, and agents used to protect against fungi. The name granular cheese can encompass many types of cheeses; for example, Parmigiano-Reggiano is a granular