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. for online orders.
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. From our classic hydrolyzed fish fertilizer to our specialized fish and seaweed blends, we have the perfect organic fertilizer for every stage of plant growth
Collapsible Foam Can Kooler
Collapsible lightweight foam cooler, perfect for keeping your canned beverages cold on the go.
$5.00
Hats Adjustable Logo
Adjustable Neptune’s Harvest logo hat, one-size-fits-all with a comfortable back clasp.
$25.00
KIDS T-SHIRT ROYAL BLUE
Kids’ Neptune’s Harvest T-shirt in royal blue, made with preshrunk heavy cotton for comfort and durability.
$20.00
Kids T-shirt Sapphire Blue
Kids’ Neptune’s Harvest T-shirt in sapphire blue, made with preshrunk heavy cotton for comfort and durability.
$20.00
Neptune’s Harvest T-shirt
Neptune’s Harvest T-shirt featuring a colorful logo on the front and “Don’t Worry, It’s Gurry!” on the back.
$25.00
Don’t Worry, it’s Gurry
Unique Neptune’s Harvest T-shirt featuring the phrase “Don’t Worry, It’s Gurry,” perfect for gardening enthusiasts.
$25.00
Why We Are Not a Fish Emulsion
Not all fish fertilizers are created equal. Most standard fish emulsions are cooked, a process that destroys heat-sensitive vitamins, amino acids, and the natural oils that soil microbes crave. Our hydrolyzed fish fertilizer is fundamentally different.
- Standard Emulsions
- Cooked at high heat, destroying enzymes
- Natural oils and proteins removed
- Strong, offensive odor
- Provides only basic NPK nutrients
- Standard Emulsions
- 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. Our hydrolyzed fish fertilizer offers numerous advantages:
Increased Yields and Vigor
The bioavailable nutrients in our fish fertilizer are easily absorbed by plant roots and foliage, leading to rapid growth, increased flowering, 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. Our dock-to-garden approach ensures that fresh-caught fish are processed the very same day, creating a sustainable, zero-waste loop.
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. Our hydrolyzed fish fertilizer has been used to grow record-breaking pumpkins, giant tomatoes, and award-winning crops. Thousands of growers across the country rely on our organic fertilizer to achieve spectacular results season after season.