Constipated goldfish is the most widely over diagnosed case on the internet. There is not ONE peer-reviewed published paper about goldfish constipation and its treatments. Most commonly, goldfish “constipation” is misdiagnosed as a cure all for a sick fish. And in comes the main treatment… shelled green peas!
What is it about these tiny green globes of goodness that make most fish rise up from the almost dead?
One: They have almost no protein whatsoever, decreasing the amount of ammonia waste from your fish, decreasing the strain on your nitrogen cycle. Decreasing the ammonia waste from your system will make ANY fish better. Every 100 grams of green peas contains 5.4g of protein. Compare that to 100g of commercial fish flake and pellets having between 32-45g of protein.
Two: Green peas sink in water, therefore making fish dive to the bottom of their tank to eat, preventing excess air from ending up in their GI and swim bladder. Goldfish are physostomous, with a duct connecting their esophagus to their swim bladder. Considering the anatomy of some fancy goldfish varieties, these ducts are extremely short and therefore more air is able to get into the swim bladder, causing positive buoyancy issues. When fish eat at the surface, slurping food down like pigs, they can take in a lot of extra air. By feeding sinking peas, they don’t suck in as much air.
Three: Goldfish “indigestion” can be caused by an inappropriate diet. Goldfish, like all other carp, are omnivores, eating plants, bugs and almost anything tasty that fits in their mouths. In feeding them a flake or pelleted diet, you are aiming for a balanced diet. There are sooooo many fish foods out there, and a lot of them are based on educated guesses rather than actual research. As a fish owner, it is up to you to evaluate your fishes’ food to make sure it is appropriate. We have our most watched webinar on this very subject of reading fish food labels. Many of these “constipation” problems are from feeding very old food. After 6 months, your fish food has lost enough of the water-soluble vitamins, including vitamin C, that you are essentially feeding your fish cardboard. Getting a fresh bag of food, or switching the diet to our green peas (full of vitamins!), fixes almost all of the fish “indigestion” cases we see.
But what about all that fiber? 100g of peas contains 4.8g of fiber and most fish foods contain 3-5g of fiber, so it’s not really all that more fibrous.
All in all, peas are a low calorie treat that fish can enjoy. But are they magical, cure all tablets of greeny goodness? Sorry, but no.