Catching Earthworms in Your Back Garden
Worms are an excellent addition to your Oscars diet. If you think about it, many creatures including birds, mice, moles all the worms, why? Because they're absolutely packed with nutrients. There are different types of worms that you can harvest from your garden. You will often find small worms whilst digging, these are not the large lob worms that I am talking about. There's nothing wrong with feeding the smaller worms to office, however a large lob worm is a really great meal so don't harvest your worms by digging.
It's great fun watching Oscars eat worms, especially when you get an Oscar on each end playing tug-of-war. Oscars absolutely love worms, they are a great source of nutrition and even better, they are completely free!
Please be aware that garden worms can occasionally carry internal parasites that are known to infect animals such as hedgehogs. To be honest with you, I have absolutely no idea whether the same parasites could be harmful to fish or not. However, to be on the safe side, store your worms for a few days before feeding them to your fish. Alternatively, you can manually squeeze the innards out of the worm. It's not a particularly nice job, but it would ensure that your Oscar does not ingest the worms stomach contents. You can keep worms alive for several days in damp moss, or damp newspaper that has been shredded. If you can keep them in the fridge, then all the better.
Article by Delboybully (edited and added to by OFL)