BioBizz Fish-Mix - Organic Fish Emulsion Feed for Vigorous Growth
Best for: growers who want a nitrogen-forward organic feed to drive strong vegetative growth in soil or coco.
Our thoughts
It smells exactly like you'd expect from a fish-based feed, but that's the trade-off for a genuinely potent organic nitrogen source. If you want your plants pushing out foliage fast in veg without reaching for synthetic feeds, this is one of the better organic options going.
Fish-Mix is BioBizz's nitrogen-rich organic liquid fertiliser, built around North Sea fish emulsion combined with Dutch sugar beet vinasse. The NPK works out to roughly 5-1-4, with around 3.6% of that nitrogen coming from organic sources in the fish emulsion and vinasse rather than synthetic mineral salts. Critically, the fish emulsion isn't acid-extracted and isn't stabilised with BHT, a synthetic preservative some cheaper fish-based feeds rely on, so you're getting a genuinely unprocessed organic input.
It's primarily designed for the vegetative stage, where the nitrogen content helps drive strong stem and foliage growth, but it also stimulates microbial activity and beneficial bacteria in the substrate, in both soil and coco-based media, which supports root health as well as top growth. It can continue to be used into flowering and fruiting to keep foliage healthy through the whole cycle.
How it compares
Fish-based nitrogen feeds are a well-established organic category, and Fish-Mix is one of the better-known options in it.
- Vs BioBizz's own Bio-Grow: Bio-Grow is a lower-nitrogen, vinasse-only base feed, while Fish-Mix pushes nitrogen harder for growers who want faster vegetative bulk-up.
- Vs synthetic vegetative feeds like General Hydroponics FloraGro: FloraGro gives more precise mineral control but no organic certification and none of the microbial-boosting benefit of a fish emulsion base.
- Vs other organic fish emulsions on the market: many budget fish feeds are acid-extracted or BHT-stabilised; Fish-Mix avoids both, which is a genuine point of difference rather than marketing language.
You're paying a bit more than a basic synthetic vegetative feed, but you get a stronger organic nitrogen hit and a soil biology benefit that mineral feeds don't offer.
Usage guidance
Dosage is straightforward, and it works both as a root feed and a foliar spray.
Watering
Use 1 to 4ml of Fish-Mix per litre of water at each feed during the vegetative stage, scaling toward the higher end for larger, heavier-feeding plants.
Foliar spray
Dilute to 1 to 2ml per litre and apply as a foliar spray to give a quick uptake boost, useful if plants are recovering from stress.
Through flowering
Fish-Mix can continue at a reduced rate into flowering and fruiting to keep foliage green and healthy, though most growers taper it down as bloom-stage feeds take over.
Technical specifications
- NPK ratio: approximately 5-1-4
- Base ingredients: North Sea fish emulsion and Dutch sugar beet vinasse
- Processing: not acid-extracted, not BHT-stabilised
- Growth stage: vegetative, extendable into flowering and fruiting
- Dosage (watering): 1-4ml per litre
- Dosage (foliar): 1-2ml per litre
- Sizes available: 500ml, 1L, 5L
- Vendor: BioBizz (Netherlands)
Who this is for
- Organic growers wanting a strong vegetative nitrogen feed
- Soil and coco growers looking to boost microbial activity in the root zone
- Growers avoiding acid-extracted or BHT-stabilised fish feeds
- Anyone running the wider BioBizz range through the vegetative stage
Best suited to the vegetative stage where you want fast, healthy foliage growth from an organic source.
Our take
Fish-Mix earns its place as one of the go-to organic vegetative feeds because it's straightforward about what it is: a proper fish emulsion, not diluted or preserved with anything synthetic, that pushes real nitrogen into the plant.
Does exactly what it should, day in, day out, if you can live with the smell while you're mixing it.
