Materials. Unfortunately, fish emulsion (as well as other similar organic fertilizers) can cost a pretty penny in stores, some ranging well over $20 per gallon, which is a considerable amount of money to ensure you successfully grow hydroponic plants! It’s also an affordable way to provide fertilizer for your garden. TIP: Our expert gardening advisor, Kathy Bosin adds, "Fish scraps, shrimp and crab shells can be safely added to your compost pile directly. Dilute the fish emulsion with a 1:5 ratio of water. Be careful when applying too much of it, though. Since I make my own fish emulsion fertilizer, I apply it every 2 weeks. When you make your own fish emulsion, you can also control the trace elements added and the growth of the microbes to suit the needs of your plants. The ratio of dilution is 1 tablespoon of fish emulsion to 1 gallon of water. The best fish to use is the type of fish that is safe for human consumption. Be sure to dig them deep inside your active compost pile to keep wildlife out." How to Make Fish Emulsion. Liquid Fish Emulsion; Plastic Spoon; Funnel Applicator - cut top half of a used soda pop bottle; Watering Can - without the sprinkler cap; Procedures Prepare the Fish Emulsion Fertilizer for Watering. Uses . You know the brew is ready when it has a yeasty type smell. Fish emulsion is appropriate for many uses in the garden but is especially useful as a lawn fertilizer in early spring and to feed leafy green vegetables due to its higher nitrogen content. There are only a few ingredients needed to make fish emulsion fertilizer. While we can’t do anything to help you with the fishy smell, we can help you make your own fish emulsion that will not only save you a lot of money in product and shipping costs, but just might make a better product than you can buy! It also might have a layer of foam on top of the tea. That is why so many people are opting to create fish emulsion at home, with a cheaper price tag attached. The main drawback to commercial fish emulsion is the cost and the smell. If your soil already contains too much nitrogen, applying too much fish emulsion can cause nitrogen "burn" and affect growth. Make your first batch, then decide if it’s enough for your garden, or if you need to do a second batch. You are also ready to make a fish emulsion tea. Ingredients List to Make Fish Emulsion Fertilizer. When brewing your fish tea it is a good idea to add seaweed and let it brew for about one week making sure you stir it up every few days.