Comparison: Best Fish Fertilizer For Sale (Updated | Dec 1st)
If you’re looking to give your garden a natural boost, you’ve probably heard about fish fertilizer—but with so many options out there, how do you know which one’s truly the best? We’ve done the digging (and the smelling) so you don’t have to. From fast-acting liquids to slow-release powders, we’re breaking down the top fish fertilizers on the market today.
1 Gallon Organic Fish Emulsion Fertilizer for Plants – Ideal Liquid Fish Fertilizer for Plants
Sustainable Yield Booster
- Best for vitamin-rich boost: CENTRAL GARDEN BRANDS 100099247 Fish Emul Fertilizer
- Best for omri certified blend: Alaska Fish Fertilizer OMRI Listed 5-1-1
- Best for wintergreen deodorized: Alaska Fish Emulsion Fertilizer 5-1-1 Concentrate 1 Gallon (Packaging may vary)
- Best for deep green formula: Fertilome (10612) Fish Emulsion Fertilizer 5-1-1 (32 oz)
- Best for sustainable yield booster: 1 Gallon Organic Fish Emulsion Fertilizer for Plants – Ideal Liquid Fish Fertilizer for Plants
- Best for odorless protein power: Neptune’s Harvest Fish Fertilizer 2-4-1
- Best for fish‑kelp fusion: GS Plant Foods Liquid Fish & Kelp Fertilizer (1 Gallon) – Organic Material Review Institute Listed Natural Plant Food for Home Gardens
- Best for vibrant bloom mix: Neptune’s Harvest Fish & Seaweed Fertilizer 2-3-1
- Best for fresh atlantic strength: Neptune’s Harvest Fish Fertilizer 2-4-1
- Best for aquarium plant nutrient: API LEAF ZONE Freshwater Aquarium Plant Fertilizer 8-Ounce Bottle
Product Comparison: Best Fish Fertilizer For Sale
CENTRAL GARDEN BRANDS 100099247 Fish Emul Fertilizer, 1 Quart
- Promotes healthy plant growth with 11 vitamins
- Can be used on all indoor and outdoor plants
- 100-percent organic
- Stimulates microorganisms
- Does not burn
Alaska Fish Fertilizer OMRI Listed 5-1-1, 115 oz
- Fish-based fertilizer for use in vegetable, fruit, and flower gardens
- Excellent for use on flowers, trees, and other plants
- OMRI listed
- For organic gardening
- Great for all indoor and outdoor plants
- NPK 5-1-1 fish emulsion fertilizer
- Fish has been used as a natural source of plant nutrients for centuries
- Easy to use, just mix with water
Alaska Fish Emulsion Fertilizer 5-1-1 Concentrate 1 Gallon (Packaging may vary)
- Will Not Burn
- Great for all plants
- Deodorized with Natural Wintergreen
- 5-1-1 fertilizer is an excellent source of organic plant nutrients
- Fish Fertilizer
Fertilome (10612) Fish Emulsion Fertilizer 5-1-1 (32 oz)
- Develops deep green foliage, vigorous root systems and a solid plant structure
- Derived from fish soluble, can be used from indoor and outdoor. Can be used on plants and trees.
- Mixes with water and can be used by any convenient method of application. Shake well before use.
- 5-1-1 Fertilizer contains 5% Nitrogen, 1% Phosphate and 1% Soluble Potash.
- For plants mix 1-2 tbsp per 1 gal of water. For trees mix 4 tbsp per gal of water.
1 Gallon Organic Fish Emulsion Fertilizer for Plants – Ideal Liquid Fish Fertilizer for Plants, Flowers, Fruits & Vegetables, 2-3-1 NPK – Sustainably Sourced and Hydrolyzed for Steady Growth
- ORGANIC FISH EMULSION FERTILIZER – Our liquid fish fertilizer is made from sustainably sourced fish emulsion and we use up all the parts that would otherwise go to waste. Using an environmentally conscious method, ingredients are refined fresh and 100% cold pressed to help retain all of the nutrients, vitamins, and amino acids needed to grow healthy plants.
- GROW PLANTS NATURALLY – This wonderfully organic alternative to synthetic fertilizer contains a 2-3-1 NPK ratio perfect for light and frequent applications. Promotes steady, healthy plant development throughout the growing season.
- ENRICHES SOIL – Helps build a strong foundation for your organic garden to thrive on! Use as an effective soil drench to improve fertility, structure, and encourage the growth of beneficial microorganisms like fungi in your garden’s soil.
- PRODUCE MORE – Get the most out of your fertilizer and your garden! This organic garden fertilizer helps to increase crop yields and flower blooms. Gentle enough to use as a foliar spray makes this the perfect fish fertilizer for plants, flowers, and vegetables.
- SMELL THE DIFFERENCE – This fertilizer smells like fish because it’s made from fish! Crafted with high-quality concentrated and undiluted hydrolyzed fish emulsion each bottle gives off a pungent fishy aroma. When compared, we see it like this – if it doesn’t smell, then it’s not real fish!
Neptune’s Harvest Fish Fertilizer 2-4-1, 18 Ounce
- Neptune’s Harvest is an organic fertilizer made from fresh north Atlantic fish
- It is made by a unique cold process that protects the vitamins, amino acids, enzymes and growth hormones
- It also contains all the micro and macro nutrients naturally found in fish
- Unlike fish emulsions, Neptune’s Harvest retains the fish proteins and oils and has no unpleasant odor
GS Plant Foods Liquid Fish & Kelp Fertilizer (1 Gallon) – Organic Material Review Institute Listed Natural Plant Food for Home Gardens, Lawns, and Vegetables
- ORGANIC MATERIALS REVIEW INSTITUTE LISTED FOR TRUSTED GARDEN CARE Certified by OMRI for use in organic growing, GS Plant Foods Liquid Fish & Kelp Fertilizer delivers reliable, natural nutrition for vegetables, lawns, flowers, and shrubs.
- SEA-AND-SOIL BASED NUTRITION Made from North Atlantic seaweed (Ascophyllum nodosum) and fresh fish hydrolysate, this liquid concentrate provides essential nutrients and trace minerals that help support healthy soil and plant development.
- IMPROVES SOIL MICROBIOLOGY & NUTRIENT UPTAKE Supports a thriving soil ecosystem that promotes strong root systems and efficient nutrient absorption — the foundation for resilient, productive plants.
- EASY-TO-USE CONCENTRATE FOR ALL PLANTS Mix 2 oz per gallon of water and apply as a foliar spray or soil drench every 2–4 weeks. Safe for use on vegetables, fruits, ornamentals, turf, and houseplants.
- MADE IN THE USA – SUSTAINABLY PRODUCED Proudly produced by GS Plant Foods as a licensed fertilizer manufacturer. No synthetic chemicals, additives, or fillers — just natural ingredients formulated for healthy home gardens and hobby farms.
Neptune’s Harvest Fish & Seaweed Fertilizer 2-3-1, 18 Ounce
- Grow a beautiful vegetable garden
- Flowers and foliage will be stronger and more colorful
- Blooms will be more plentiful, fragrant and longer lasting
- Easy to mix and apply by hand, sprayer, or drip line
Neptune’s Harvest Fish Fertilizer 2-4-1, 36 Ounce
- Neptune’s Harvest is an organic fertilizer made from fresh north Atlantic fish
- It is made by a unique cold process that protects the vitamins, amino acids, enzymes and growth hormones
- It also contains all the micro and macro nutrients naturally found in fish
- Unlike fish emulsions, Neptune’s Harvest retains the fish proteins and oils and has no unpleasant odor
API LEAF ZONE Freshwater Aquarium Plant Fertilizer 8-Ounce Bottle
- Product Type: ARTIFICIAL PLANT
- Package length: 19.558 cm
- Package width: 3.048 cm
- Package height: 4.572 cm
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.com at the time of purchase will apply to the purchase of this product.
Buying Guide
FAQs
What should I consider when choosing a fish fertilizer?
Look at the NPK ratio, organic certification, and any added ingredients like seaweed or kelp that can boost nutrient availability. Check the product’s odor level if you plan to use it indoors, and verify the recommended dilution rates for your plant types. Finally, compare container size and price to ensure you get the best value for your garden’s needs.
How do NPK ratios affect plant growth and which ratios are common among these products?
The NPK ratio indicates the proportion of nitrogen, phosphorus, and potassium, which drive foliage growth, root development, and fruiting respectively. Most fish fertilizers in the list use a 5‑1‑1 or 2‑3‑1 ratio, providing a strong nitrogen boost for leafy growth while still supporting blooming and root health. Choose a higher nitrogen ratio for leafy vegetables and a more balanced ratio for fruiting plants.
Which fish fertilizers have the least odor and are best for indoor use?
Neptune’s Harvest formulas are processed to retain fish proteins while eliminating the strong smell, making them ideal for indoor gardening. Alaska’s Fish Emulsion also advertises a deodorized wintergreen scent, which reduces the typical fishy odor. Both options are safe for indoor plants and will not burn foliage when diluted correctly.
Are OMRI‑listed fish fertilizers necessary for organic gardening?
OMRI listing confirms that a product meets the standards for organic production, so using an OMRI‑listed fertilizer like Alaska Fish Fertilizer or GS Plant Foods ensures compliance with organic certification programs. While non‑listed fish fertilizers can still be organic, they may not be accepted in certified organic farms. If certification matters to you, choose an OMRI‑listed option.
How do the concentrations (e.g., 1‑quart vs 1‑gallon) impact value and application frequency?
Larger containers such as the 1‑gallon bottles provide a lower cost per ounce and reduce the number of refills needed throughout the season. However, they require more careful dilution to avoid over‑feeding, especially for small indoor pots. Smaller sizes like the 1‑quart or 18‑ounce bottles are convenient for trial use or limited‑space gardens but have a higher price per volume.
What are the benefits of fish fertilizers that include seaweed or kelp?
Seaweed and kelp add trace minerals, hormones, and natural growth stimulants that improve root development and stress resistance. Products such as GS Plant Foods Liquid Fish & Kelp combine fish nutrients with kelp to enhance soil microbiology and nutrient uptake. This blend can lead to stronger, more resilient plants compared to fish‑only formulas.
How do price and quantity compare across the listed options for overall cost‑effectiveness?
Neptune’s Harvest and Alaska Fish Emulsion typically offer competitive pricing per ounce when purchased in larger volumes like 1‑gallon or 36‑ounce bottles. Central Garden Brands provides a smaller 1‑quart size at a higher per‑ounce cost, making it less economical for long‑term use. For the best value, consider bulk purchases of OMRI‑listed or odor‑controlled formulas that match your garden’s nutrient needs.