Neptune's Harvest
Neptune's Harvest organic fertilizer farm fields

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.

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
Abundant Harvest with Neptune's Harvest organic fertilizer

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.

Shop Hydrolyzed Fish Fertilizer

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
Gloucester Harbor - birthplace of Neptune's Harvest

Born in Gloucester, MA

Trusted by growers since 1965. Made with fresh-caught North Atlantic fish.

OMRI Listed Seal - Neptune's Harvest certified organic fertilizer

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

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