Hydrolysed fish has become an increasingly popular and often fan-favourite component in sustainable agriculture, offering numerous benefits that contribute to soil health, plant growth, and overall farm productivity. This natural fertiliser is derived from the remains of ocean fish through a process called enzymatic hydrolysis. This method ensures that all the nutrients, amino acids, vitamins, and trace elements present in the fish are preserved, making hydrolysed fish a potent tool for Tow and Fert users looking to enhance their crops and reduce their reliance on synthetic fertilisers. For some, this leaves us wondering… WTF? We’ll discuss why the fish is all about in this article.
So Why the Fish?

Improving Soil Health
One of the most significant advantages of using hydrolysed fish is its ability to improve soil health. The organic matter in hydrolysed fish feeds the beneficial microbes, bacteria, and fungi in the soil. These microorganisms play a crucial role in breaking down organic matter, improving soil structure, and increasing water-holding capacity. The enhanced microbial activity also leads to better nutrient cycling, making nutrients more readily available to plants. This results in healthier, more productive soils that can support robust crop and pasture growth.
Providing Essential Nutrients
Hydrolysed fish is rich in essential nutrients required for plant growth, including nitrogen, phosphorus, potassium, and a wide range of trace elements like calcium and magnesium. These nutrients are delivered in a form that is easily absorbed by plants, promoting strong root development, improved nutrient uptake, and enhanced plant resilience. The cold-processing technique used in creating hydrolysed fish ensures that the nutritional integrity of the fish is preserved, offering plants a balanced and comprehensive nutrient profile.
Enhancing Plant and Animal Health
The use of hydrolysed fish not only benefits plants but also positively impacts animal health. When used in pastures, it increases the nutritional content of the forage, providing grazing animals with a richer diet. This leads to healthier animals and can improve the quality of animal products such as milk and meat. Additionally, the natural bioactive compounds in hydrolysed fish help boost plant immunity, making them more resistant to pests and diseases, which in turn reduces the need for chemical interventions.
Promoting Environmental Sustainability
Hydrolysed fish is a sustainable alternative to synthetic fertilisers. Its production involves recycling fish by-products that would otherwise go to waste, making it an environmentally responsible choice. By reducing the need for chemical fertilisers, hydrolysed fish helps to lower the environmental impact of farming practices. It also minimizes the risk of nutrient runoff into waterways, which can lead to issues like algae blooms and water contamination. Overall, hydrolysed fish supports a more sustainable and eco-friendly approach to agriculture.
Easy Application Across Various Farming Platforms
Hydrolysed fish is versatile and easy to apply, making it suitable for a wide range of farming practices. It can be used in both soil and foliar applications and is compatible with most standard crop protection treatments. This flexibility allows farmers to integrate hydrolysed fish into their existing fertilisation routines with minimal disruption, whether they are cultivating broadacre crops, managing orchards, or tending to pastures.
That’s why the fish!
Hydrolysed fish is a powerful and sustainable tool for modern agriculture. Its ability to improve soil health, provide essential nutrients, enhance plant and animal health, and promote environmental sustainability makes it a valuable resource for Tow and Fert farmers seeking to optimize their operations naturally and responsibly.
This article was written using information from the following brands: Biomarinus, Fish IT, FishBoost, Eco Growth Liquid Fish, and Vitec Liquid Fish. These products are available in New Zealand and Australia and are all compatible in your Tow and Fert sprayer as a stand alone spray or mixed in with your fert, lime etc.
Hear it from a Tow and Fert user:
Georgie Galloway