Cute But Deadly: The Truth About Fish Bowls

If you have ever gone to the fair or a carnival, you’ve probably seen goldfish or betta fish being given away as prizes. In many cases, the fish are just given away in bags, but some places give them away in small fish bowls. What many people do not realize is that keeping a fish in a fish bowl is tantamount to animal cruelty.

Why Fish Bowls are Bad

Keeping a betta fish or goldfish in a small fish bowl is equivalent to soaking in a bathtub contaminated by your own waste – there simply isn’t enough water to dilute the waste. The key to keeping aquarium fish healthy is to maintain high water quality in the tank, and that simply isn’t possible with a fish bowl unless you change the water every day. As your fish eats, it naturally produces waste and in a fish bowl there isn’t anywhere for that waste to go. As a result, it accumulates in the bottom of the fish bowl where it will have a negative impact on water quality. If you don’t change the water in the bowl, the accumulation of wastes can quickly lead to toxic conditions which could kill your fish. This is why many goldfish only last a few days after being brought home from the fair.

Related: Tank Stocking: The Truth About The 1 Inch Per Gallon Rule

In addition to promoting toxic conditions, here are just a few more reasons why fish bowls are bad:

  • They don’t offer enough swimming space. Betta fish grow up to 3 inches long and goldfish can grow much larger. A small fish bowl simply doesn’t offer enough swimming space to keep a fish healthy.
  • They have rounded edges. If you have ever tried to look through a fish bowl you probably noticed that it distorted your vision. Keeping a fish in a rounded bowl can be disorienting.
  • There isn’t enough beneficial bacteria. In order to keep the water quality in a fish tank high, you need beneficial bacteria to convert the chemicals produced by the breakdown of waste into less harmful substances. In a fish bowl there simply isn’t enough water or space to cultivate an adequate colony of beneficial bacteria.
  • They aren’t big enough for heaters or filters. A fish bowl isn’t designed to accommodate a tank heater or filter. Without a heater, the water temperature in your fish bowl is subject to fluctuations which could stress or kill your fish. Without a filter, the water quality will quickly decline and even small changes in water chemistry could be deadly.
  • They generally don’t come with lids. Betta fish can jump up to 6 inches in the air – it is a natural adaptation they have from living in shallow pools and puddles in their native habitat. If you don’t keep a lid on your fish bowl (and most of them aren’t designed with lids), you run the risk of coming to feed your fish one day and discovering him dried out on the floor.

Related: How to Properly Acclimate New Fish in the Aquarium

Bigger is Better

If you are new to the aquarium hobby, you might think that a small fish bowl is easier to maintain than a large tank. Unfortunately, you would be mistaken. Sure, it might take more money to set up a large aquarium than to fill a fish bowl, but the maintenance will be easier in the long run. With a larger aquarium you have a larger water volume – this means that wastes and toxins are diluted so you don’t have to perform water changes as often as you would to maintain water quality in a fish bowl. A larger tank also means that you will be able to accommodate a filter and a heater which will keep the conditions stable for your fish. Finally, if you do happen to make a mistake in regard to water chemistry, having a higher water volume means that the mistake could be relatively minor and you should be able to remedy it before it affects your fish. A minor mistake in a small fish bowl could be deadly for your fish in a matter of minutes.

If you really want to do what is best for your fish, you won’t even consider a fish bowl as an option. It might take a little more time and money to cultivate a larger fish tank, but it is definitely worth it for the health and wellness of your fish.

kate-Bio_PicIf you think there’s something fishy about Kate Barrington, it’s because she’s been a lifelong lover of pets, particularly aquarium fish. Since receiving her first 10-gallon tank as a birthday present in 5th grade, she has become an avid aquarium enthusiast as well as a freelance writer specializing in the aquarium niche. Kate is a regular contributor to several aquarium fish websites and has a column in a bi-monthly pet magazine.


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