It’s official — Fish Sh!t is swam across the Atlantic a while back but has so far gone slightly unnoticed until now and it's making serious waves in the UK horticultural scene. With a name that raises eyebrows and results that raise yields, this microbial marvel from Fish Head Farms is fast becoming a reel game-changer for growers on this side of the pond.
But what is Fish Sh!t exactly? Is it just another gimmick with a cheeky name, or is there something slippery and scientifically sound beneath the surface?
Spoiler alert: this stuff is legit — and yes, it comes from actual fish poo.
🐟 What is Fish Sh!t?
Let’s dive straight in. Fish Sh!t is a living microbial inoculant — essentially, it’s a highly concentrated tea of beneficial microbes, extracted from the digestive waste (yes, the sh!t) of fish living in an aquaponic ecosystem.
It’s not “just” fish poo — it’s the biologically rich ecosystem surrounding the fish that makes this product shine. The result is a liquid brimming with beneficial bacteria, fungi, and microbial metabolites that turbocharge your root zone, your nutrient uptake, and ultimately, your plant performance.
So yes, it’s fish poo — but it’s poo with purpose.
🧪 The Science Behind the Sh!t
Here’s what makes Fish Sh!t truly unique:
🧫 Microbial Powerhouse
Fish Sh!t contains over 3,000 species of beneficial microbes, including:
• Nitrogen-fixers (convert atmospheric nitrogen into plant-usable forms)
• Phosphate solubilizers (unlock phosphorus tied up in the substrate)
• Mycorrhizae and rhizobacteria (enhance root surface area and defence)
• Decomposers (break down dead organic matter into usable nutrients)
These organisms work symbiotically with your plant’s root system to improve nutrient uptake, strengthen root health, and build a thriving soil food web.
💩 Metabolite Magic
Microbes in Fish Sh!t produce enzymes, organic acids, hormones, and natural chelators that:
• Stimulate root development
• Help regulate pH at the rhizosphere
• Encourage explosive vegetative and flower growth
• Increase flavour and terpene production in fruiting plants
This isn’t just nutrient delivery — it’s microbial management of the entire rhizosphere.
🧬 How Is Fish Sh!t Made?
Fish Head Farms uses a closed-loop aquaponic system, where fish live in a controlled, chemical-free environment. Their waste accumulates in water that is:
1. Collected and filtered to remove solids,
2. Biologically processed to culture microbial populations,
3. Brewed and refined into a liquid form with optimal microbial density,
4. Bottled fresh — no pasteurisation, no preservatives, just living biology.
It’s sustainable, organic, and kind of brilliant. The fish do the dirty work, the microbes do the heavy lifting, and your plants reap the benefits.
🌱 Why UK Growers Are Hooked
🐠 It’s Organic
Fish Sh!t is OMRI-listed and compatible with both soil and hydroponic systems. Whether you’re growing organically in coco or synthetically in hydro, it slips right into your schedule.
💪 It Boosts Plant Immunity
Think of it as a gut biome for your plants. By populating the root zone with beneficial microbes, Fish Sh!t reduces the chance of bad guys (pathogens) moving in.
🌸 Bigger Yields, Better Flavour
UK growers are already seeing results — stronger growth, improved uptake, and noticeable increases in flavour, aroma, and oil production in fruiting and flowering plants.
💧 It’s Versatile
Use it in:
• Transplant dips
• Soil drenches
• Coco/hydro systems
🎣 Don’t Be Koi – This Sh!t Works
Fish Sh!t isn’t just a novelty with a cheeky label — it’s a seriously smart tool for growers who understand the importance of root biology. In an age where synthetic nutrients dominate, adding a biological edge can mean the difference between “just decent” and crop-defining success.
Plus, it’s fun to say:
“What’s in your feed schedule?”
“Oh, just a little Fish Sh!t…”
🧠 Final Thoughts: This Sh!t is the Catch of the Season
With science on its side and a splashy name to boot, Fish Sh!t is making a stink in the best way possible. It’s turning sceptics into believers and average root zones into biological hotbeds of growth.
So whether you’re an old school organic soil grower or running a sleek hydro setup, remember: sometimes the secret to going big… is adding a little sh!t.
Available in the UK — grab your bottle before everyone else gets a whiff!