HomeFreshwater FishFreshwater Fish Health & CareHow Long Your Betta Fish Can Go Without Food (Vacation Prep)

How Long Your Betta Fish Can Go Without Food (Vacation Prep)

What happens when you leave your Betta fish for an extended period to go on vacation, a business trip, or for any other reason?

You might wonder how to feed your Betta fish when you’re away or how long they can survive without food. The last thing you want is for your pet to pass away before you return home.

In this guide, National Park Aquarium will discuss everything you need to know about leaving Betta fish for a long time. You’ll learn how long they can go without eating and the various methods you can use to provide them with food when you’re away.

How Long Can Beta Fish Go Without Eating?

Most Betta fish can survive for about 10-14 days without food. Although Betta fish are often picky eaters, they have a stomach the size of their eye, so they don’t need a lot of food to survive.

In the wild, Betta fish can live from several days to even a few weeks without receiving suitable food. This is because food can be scarce in their natural environment, and their robust bodies are accustomed to entering periods of hunger.

However, remember that Betta fish in this state can be very weak and more susceptible to illness. If starvation doesn’t kill them, stress or some disease will, so you should not leave your pet unfed for a long time.

Betta fish can survive for about 10-14 days without food
Betta fish can survive for about 10-14 days without food

What Happens When Betta Fish Go Without Food?

When Betta fish go without food for an extended period, they can become lethargic. The Betta fish will weaken and not move much. Here are the fasting timelines and the effects of not having food for Betta fish.

Short-term fasting (Maximum 2-3 days): Mature Betta fish can typically withstand a few days without food without significant stress or health issues. Their metabolism allows them to switch to a fasting mode, although this is not ideal.

Mid-term fasting (3-7 days): Extending the fasting period beyond a few days begins to exceed the safety limit. The fish will start using stored energy (fat and muscle) for sustenance, which is not good for long-term health. They may also become more susceptible to illness.

Long-term fasting (more than 7 days): After a week without eating, the risks significantly increase. Prolonged fasting can lead to malnutrition, weakened immune system, and more serious health problems, including death in severe cases.

Signs of Lethargy in Betta Fish After 7 Days Without Food
Signs of Lethargy in Betta Fish After 7 Days Without Food

Water quality: Lack of food can reduce the waste produced by the fish, but it is essential to continue monitoring and maintaining water quality, as poor water quality can exacerbate health problems.

Behavioral changes: Betta fish may become less active and show signs of stress, such as color loss when they do not have food for a long time.

Increased susceptibility to disease: Weaker fish are more likely to get infections and diseases.

Digestive issues: Long-term fasting can also cause digestive problems when you resume feeding, so you should start feeding slowly and with easily digestible foods.

Interactions with other fish species: If you have a community tank, hungry betta fish may become more aggressive or conversely, more likely to be attacked by other fish species.

Video source: GPB Channel

Tips To Keep Your Fish Healthy While You’re Away

If you must leave your fish unattended due to unavailability, there are a couple of alternatives to ensure they remain adequately fed during your absence:

1. Use an Automatic Feeder

The biggest challenge you’ll face when you’re away is ensuring your Betta fish are fed regularly.

To ensure your beloved Betta fish are fed, consider purchasing and using an automatic feeder. This device will distribute a small, regular amount of food and can be set for as long as you like. This means your Betta will have something to eat even when you’re not there to feed it.

Learn about: How often to feed betta fish and how much?
Automatic Fish Feeder for Betta
Automatic Fish Feeder for Betta

2. Block Feeder

A feeder block is a large block of food that you put in the tank before going away for a while. These blocks will gradually decompose in the tank and release food for your Betta fish.

Your fish won’t be able to eat more than they need because it takes time for the block to release food into bite-sized pieces.

However, there are some known issues with feeder blocks. One of them is that you can’t control how much your fish eat. Overfeeding betta fish is very dangerous as some fish will continue to eat as long as they can see food.

Feed Betta A High-quality, Varied Diet
Feed Betta A High-quality, Varied Diet

3. Feeding your Betta fish a Diverse Diet

A diverse diet is crucial for maintaining their health, so ensure your automatic feeder has a variety of fish food.

Some feeders allow you to load specific food portions for your Betta, which would be ideal for maintaining your Betta’s health when you’re away. Provide a mix of high-quality dry and wet food, as well as occasional treats like brine shrimp or bloodworms.

Learn about: Best food for betta fish (what to feed & to avoid)
Feeding your Betta fish a Diverse Diet
Feeding your Betta fish a Diverse Diet

4. Do a Partial Water Change

Betta fish can survive without food for a while, but they always need clean water. Without it, you might return to a weak or dying Betta, even if you’re using an automatic feeder.

Ensure your Betta tank is clean and filled before leaving (change at least 50% of the water). If using tap water, a water conditioner will remove chlorine and other pollutants.

5. Ensure Their Health Before Departure

Maintaining your fish’s health while you’re away can be challenging, so ensure they’re healthy before you leave.

Observe your fish a few days prior to your departure. If they’re sick, they’ll need more care, ideally from another pet enthusiast. If your beloved pet is in good health, there’s nothing to worry about and you can proceed as planned.

Even if your actions may be somewhat limited, knowing your pet’s health will at least prevent surprises when you return.

Ensure Their Health Before Leaving
Ensure Their Health Before Leaving


Betta fish can survive up to 14 days without food, but this is stressful for them and not recommended. It’s essential to know how long your betta fish can go without food before you travel and what preparations are needed to keep them healthy.

Ensure that your tank and betta fish are properly prepared at least a week before you leave. Use pet-sitting tools, automatic feeders, or feeding blocks to ensure your betta fish doesn’t go hungry.

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Kevin Mills, the founder of Nationalparkaquarium.org


-- Founder --

I'm Kevin Mills, the founder of Nationalparkaquarium.org, where I share my deep passion for aquariums and aquatic life. With over 20 years of experience in fishkeeping, covering everything from tending to saltwater and freshwater tanks.

Kathleen Wood


-- Interrogator --

Kathleen Wood, a seasoned marine biologist, possesses a wealth of knowledge and experience in her field. Her research on tropical fish biodiversity spans over three decades, and she has contributed numerous scientific papers on aquatic life.