Neptune's Harvest Fertilizers, Fish Fertilizer, 5 GalProduct Description Highly nutritional protein fertilizer made with naturally occurring enzymes present in fresh north atlantic fish. Nitrogen, derived from fish protein in the form of amino acids, slowly breaks down into basic compounds when added to soil. Does no biological damage to the soil and will promote the growth of beneficial bacteria. Because no oils or proteins are removed, the nutrients remain in the soil longer. Product Benefits