General Hydroponics
General Hydroponics BioMarine 2 - 3 - 1
Best organic fish fertilizer for gardeners seeking vibrant, resilient plant growth.
General Hydroponics BioMarine® is a 100% organic fish fertilizer designed to promote vigorous plant growth, enhance color, and bolster resistance to pests. Derived from cold-processed, enzymatically digested fish, it delivers essential proteins, oils, and nutrients. This formula supports healthy development and stimulates beneficial soil microbiology, improving overall soil integrity. BioMarine® is suitable for all plant types and growth stages, from seedlings to harvest, and can be used alone or in conjunction with other fertilizers.
$249.78
Owner Satisfaction
4.6
/ 5
Category Rank
1927
/ 4352
#1927 in Fertilizers
Price vs Category Average
+305%
Above average
NPK Ratio
231
/ - -
Who it's for
- Organic gardeners focused on soil health and natural inputs
- New growers needing gentle nutrition for delicate seedlings
- Soil enthusiasts looking to cultivate a thriving microbial ecosystem
Who should skip it
- Hydroponic growers using recirculating systems with pumps and drippers
- Gardeners managing heavy-feeding plants requiring high-potency nutrients
- Indoor gardeners sensitive to strong, lingering organic smells
Performance breakdown
Microbial Stimulation
Cold-processed enzymes provide a massive boost to beneficial soil life.
Nutrient Bioavailability
Liquid concentrate ensures rapid absorption for immediate plant uptake.
Organic Integrity
Pure fish-derived formula meets the highest standards for organic gardening.
Application Versatility
Works seamlessly as a standalone feed or within complex nutrient programs.
Pest Resistance
Strengthens plant health to naturally deter common garden insect threats.
Growth Stimulation
Balanced NPK ratio promotes steady, vigorous development across all stages.
Key Specs
NPK Ratio
2 - 3 - 1
Package Size
6 Gallons
Form
Liquid Concentrate
Fertilizer Source
Organic
Nitrogen Percentage
2.0%
Phosphorus Percentage
3.0%
Potassium Percentage
1.0%
Organic Certified
Yes
Features
- Completely organic fish fertilizer
- Encourages rapid plant growth
- Improves plant color and vibrancy
- Increases plant resistance to pests
- Supports healthy plant development
- Stimulates beneficial soil microbiology
- Suitable for all plant types and growth phases
- Versatile use: standalone or with other fertilizers
What customers say
Consumers consistently praise the quality and effectiveness of General Hydroponics BioMarine, noting significant improvements in plant growth and overall vigor. The product delivers potent, natural nutrition that genuinely boosts results. While users frequently mention the strong, unavoidable odor inherent to fish emulsion, they overwhelmingly agree that the impressive performance makes this minor inconvenience worthwhile. This balance of high quality results and reliable plant health solidifies its strong value proposition among natural nutrient options.
Know before you buy
Yes, this fertilizer is formulated for all plant types, including vegetables and houseplants. It is safe to use throughout every growth stage, from seedlings to harvest.
BioMarine is highly versatile and can be used as a standalone fertilizer or combined with other products. Because it is a liquid concentrate, it integrates easily into most existing feeding schedules.
Beyond providing primary nutrients, BioMarine stimulates beneficial soil microbiology. This activity improves overall soil integrity, creating a healthier environment for root development.
As a 100% organic fish-based fertilizer, it does have a distinct, natural fish scent. This is typical for cold-processed fish emulsions and is a sign of its organic composition.
While it is effective for houseplants, be mindful of the natural fish scent when using it indoors. Ensure your space is well-ventilated after application.
The NPK ratio is 2-3-1. This indicates a higher concentration of phosphorus, which is specifically beneficial for supporting root development and overall plant vigor.
Still have a question?
Ask Hayley anything about this product before you decide.
Ready to buy?
$250