FoxFarm Wholly Mackeral Fish Fertilizer QrtIn Store Location: @A8 FoxFarm Wholly Mackeral Plant Food, qt FoxFarm Bush Doctor Wholly Mackerel (3 1 0) is a liquid plant nutrient derived from marine fish species and is an enzymatically digested product. It provides readily available amounts of organic nitrogen, phosphorus and potassium to growing plants. This extra strength fish fertilizer contains 20 different amino acids, 13 vitamins and 8 minerals including manganese, iron, copper and zinc.