Hydrolyzed Fish Fertilizer & Organic Soil Builders
Organic fertility that works like a professional input. Made with fresh-caught North Atlantic fish right on the docks of Gloucester, MA. Free shipping in the contiguous U.S.
Solutions for Every Scale of Growing
Cold-Processed
Retains delicate vitamins, amino acids, and enzymes unlike heat-processed fertilizers.
Microbiome Booster
Stimulates beneficial microbes and fungi, unlocking trapped nutrients for explosive root growth.
OMRI Listed Organic
Completely safe for use around children, pets, and pollinators. No synthetic chemicals.
Zero-Waste & Sustainable
Upcycled from fresh North Atlantic fish right on the docks of Gloucester, MA.
Shop Our Best-Selling Organic Fertilizers
The Core Four essentials for your garden.
Hydrolysate vs. Emulsion: The Cold-Processed Difference
Not all fish fertilizers are created equal. Most standard fish emulsions are cooked and stripped of their natural oils. We do things differently.
Standard Emulsions
- Cooked at high heat, destroying enzymes
- Natural oils and proteins removed
- Strong, offensive odor
- Provides only basic NPK nutrients
Neptune's Harvest
- Cold-processed to protect heat-sensitive vitamins
- Retains 100% of natural fish oils and amino acids
- Fresh, earthy scent (processed same-day)
- Feeds soil microbes for explosive root growth
The Benefits of Using Hydrolyzed Fish Fertilizer
Whether you are a home gardener or a commercial farmer, incorporating a high-quality organic fertilizer into your routine can transform your yields.
Increased Yields and Vigor
The bioavailable nutrients in our fish fertilizer are easily absorbed by plant roots and foliage, leading to rapid growth and higher crop yields.
Improved Soil Health
Unlike synthetic chemicals that deplete the soil, our organic fertilizer feeds the beneficial microbes, earthworms, and fungi that create a thriving soil ecosystem.
Safe for All Plants
Our OMRI listed fertilizer is gentle enough for delicate seedlings yet powerful enough for heavy-feeding crops. It will not burn your plants when used as directed.
A Legacy of Zero-Waste: From the Docks to Your Garden
Neptune's Harvest is a division of Ocean Crest Seafoods Inc., established in 1965 as a wholesale fish and seafood company.
We saw firsthand the incredible nutrient value of the fish parts that were historically discarded after filleting. Instead of letting this vital resource go to waste, we developed a way to capture the raw vitality of the North Atlantic and return it to the soil.
Read Our Full Story
Born in Gloucester, MA
Trusted by growers since 1965. Made with fresh-caught North Atlantic fish.
Trusted by Growers, Backed by Science
Our commitment to quality and organic integrity is unwavering. We are proud to offer an OMRI listed fertilizer, assuring professional growers and home gardeners alike that our products meet the rigorous standards of the National Organic Program.
When you choose Neptune's Harvest, you're choosing a proven, science-backed input that delivers consistent, world-record results without compromising environmental stewardship.
View OMRI Certificates & Compliance Info