Immature Nothobranchius palmqvisti Gezani feeding on grindal worms

Grindal worms (Enchytraeus buchholzi) are very easy to keep and breed, and make an excellent food for small to medium fish. A typical harvest will contain numerous larger (up to 1cm) and smaller worms (1mm or smaller) suitable for even tiny fry, and what's more, these worms will live happily underwater without dieing and causing pollution. This is an ideal situation to feed tanks of immature killies. Some individuals of certain species (like Nothobranchius palmqvisti Gezani, above) may outgrow, and ultimately predate on their smaller siblings. Grindal worms provide ample food for fry of all sizes, and unlike artemia, don't all bunch together in one area of the tank. Importantly, all fish get a chance to feed.

All you need to culture grindal worms: oats, media, glass, water
All you need to culture grindal worms: oats, media, glass, water

Grindal worm culture regime

The worms and media are kept in plastic food storage boxes, loosely lidded, with ventilation holes. Each culture is fed and harvested at the same time approximately every 24 hours. Cultures live indoors on the top (warmest) shelf of the fish room all year round. It is important to allow the worms ample ventilation; cultures with no air can crash very quickly, however they should not be allowed to dry out.

The traditional culture media for grindal worms is much the same as for white worms: a blend of coir (45%), peat/compost (45%), a small amount of sand (10%), maybe a handful of lime to maintain alkalinity. Cultures will turn acidic eventually and should either be replaced with new cultures if production drops, or partially replaced continuously (I take a few handfuls of media to a fish auction every now and again, and then top up the old culture). Activated carbon can be added to the media. The media should always be damp, yet never waterlogged or sodden.

Another method for housing grindal worms, and one that works very well indeed, is to keep the worms in damp sponge. Simply cut a rectangle of open-pored sponge, maybe three to four centimetres thick, and place it in half a centimetre depth of water in the food storage box. This is the perfect media for grindal worms, maintaining the correct humidity, and providing a huge area for the worms to inhabit. The sponge may need to be rinsed out periodically, especially if production drops.

A typical grindal worm culture
A typical grindal worm culture
The worms gather on the glass in large numbers
The worms gather on the glass in large numbers
The worms can be simply rinsed off
The worms can be simply rinsed off

Feeding grindal worms

Whichever media the worms are kept in, they are fed the same way: on (under) glass plates. I sprinkle a light layer of fine instant oat cereal on the damp glass, and place face down on the culture. Keeping the food on the glass keeps the culture fresh, minimises mold and mites, and draws the worms to the glass for easy harvesting.

The worms are collected 24 hours later, simply by running clean water over the glass. The glass can then again be reloaded with food.

Grindal worm culturing problems

These really are one of the easiest livefoods available for killifish keepers. Provided cultures are kept warm and well fed they can provide daily worms for months with no real problems. Cultures should be restarted when production drops off. Many people complain about mites within their cultures, and moth balls can be used, however if the food is under a large enough piece of glass this is rarely a problem. In fact mites can act as an additional food source for surface feeding killies.

Feeding grindal worms to killifish

Grindal worms make a superb food for most small and medium sized killifish. Quicker growing annual fish such as Nothobranchius will take grindal worms fairly quickly after artemia, often within their first week. Make sure you feed very small numbers if you have a substrate in your tank, as worms will bury themselves, eventually dieing under the gravel. As is the case with white worms, apple and rams-horn snails will eat grindal worms given the opportunity.

10 day old Nothobranchius furzeri eating grindal worms

10 day old Nothobranchius furzeri eating grindal worms This is a still from a short video clip. Click the the image to go to youtube and play the clip. Note there is a high resolution version (just below the image on youtube, look for the 'watch in high quality' link)

Grindal worm cultures for sale

4 oz Grindal worms Starter culture if you buy two I'll give you one for free

Ogden, Kansas, 665**, UNITED STATES OF AMERICA


We do not ship to Hawaii, Alaska, Guam or Puerto Rico, 4 OZ Grindal worms Starter culture Comes in a 16 ounce plastic containerif you buy two I'll give you one for free total 3
friend the worm when you receive it you only put a small ball of food
and as the worm multiplies another ball of food is added
If you throw a lot of food to the worms, the food that they don't eat is damaged and that kills the oxygen of the earth and they die the wormsI only recommend feeding them as they ... more

Live Grindal Worms, READY TO FEED - feeder worms for fish, baby fish, axolotls

Pelham, Alabama, 351**, UNITED STATES OF AMERICA


You are purchasing 4 oz container of LIVE grindal worms. Your ready-to-feed worms will be shipped the very next day via First Class + tracking number. If you purchase after 4pm on Saturday, worms will be shipped the upcoming Monday. Please note that this is not 4oz of ONLY worms. Worms and dirt are in a 4 oz container and they will not weigh 4 fluid oz. I cannot ship worms without a medium for them to live in because they will die in a cluster of too many worms. However, there is a sufficient ... more

Grindle Worm Mature Culture 16oz - Live Fish Food Culture

Stony Creek, New York, 128**, UNITED STATES OF AMERICA


Grindle Worm Mature Culture 16oz - Live Fish Food Culture. This culture stays at room temperature and has been producing for a few weeks now and has hundreds of worm in it. What to expect: 16oz deli cup with coco coir substrate and grindle worms
Care Guide:Supplies you??ll need:Peat moss, organic coconut fibers, or organic potting soilFish food, cat food, cat treats, or dog foodContainer (Length is more important than height)(Optional) plastic canvas and small clear lidSetting up your ... more

Grindal worm culture in 12OZ Cup(Please read description before purchasing)

Marathon, New York, 138**, UNITED STATES OF AMERICA


I ship orders (usps first class mail service) on Monday, Tuesday ,and Saturday ?
Grindal worms culture starter in 12oz cup, very easy to culture no smell at all!

 DOA Policy: In case of any DOA, buyer MUST send a 10 second video of dead in closed container next to shipping label within 2 hours of delivery time  
We will send you a replacement at no additional charge but you will be responsible for the shipping fee

Shipping cost is not refundable more

2 oz Grindal Worm Starter Culture Live Fish Food

Lyons, Kansas, 675**, UNITED STATES OF AMERICA


You will receive a 2oz cup of grindal worms, there wilL NOT be instructions on how to take care of them
... more