How to Bag and Ship Live Fish

Co-authored by Joe Perez and Christopher M. Osborne, PhD

Last Updated: July 22, 2024 Approved

If you’re interested in selling live fish beyond your local area, you must learn how to bag and ship them. It’s essential that you get the proper supplies, prepare the fish for travel, bag and box the fish correctly, and arrange for a careful but fast shipment and pickup. If you follow the process the right way, the significant majority of your fish will arrive in good health.

Bagging and Shipping Live Fish

Fill a plastic bag made for shipping fish halfway with water and put the fish in the bag. Add oxygen to the bag with a can of oxygen or a hand pump and secure the bag with rubber bands. Put insulating material and the bag in a styrofoam box and seal it. Ship it overnight (if possible) with a shipper that accepts live animal shipments.

Part 1

Part 1 of 4:

Gathering Mailing Supplies & Readying the Fish

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1
Buy shipping bags and boxes designed for fish transport. Choose plastic bags designed specifically for transporting fish—they should have flat bottoms when filled and be at least 3 mils thick (and ideally 4 or more mils). Likewise, use fish shipping containers that have sturdy cardboard outer boxes and inner Styrofoam boxes that fit inside perfectly.
- You can order these online from companies that deal in exotic fish supplies. You might also find them in fish supply or pet stores.
- The bags and boxes come in various sizes. If you’re putting a single fish in each bag—which is the safest method—choose bags that are about 3 times as wide as your fish breed’s average length. Choose the box size based on the number of bags you intend to ship at a time.
- Your chosen shipper might not absolutely require fish-specific bags and boxes, but they’re your best bet for getting your fish to their destination.^{[1]
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Place your fish in an isolation tank for 24-48 hours without feeding them. Move the fish you intend to ship to a separate tank that’s set at their ideal water temperature. Use an aerator and filter to keep the water clean, oxygen-rich, and conditioned properly based on the fish breed’s needs.
- Do not feed the fish while they’re in isolation. You want them to create as little waste as possible during their journey.
- Check for any signs of disease during this time, since you don't want to ship out diseased fish—especially to a paying customer.
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Decrease the water temperature gradually to your fish breed’s lower limit. During the 24-48 hour isolation period, incrementally reduce the water temperature from the ideal to the lower healthy limit for that fish breed. Turn down the tank’s heater a little more every few hours and check the progress with a tank thermometer.
- This process will slow their metabolism, which means they’ll consume less oxygen and produce less carbon dioxide and waste.
- You might think you should increase the temperature to make up for heat loss during shipping, but the box’s insulation—along with heating pads, if needed—will take care of that.

Part 2

Part 2 of 4:

Bagging the Fish

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1
Fill the bag less than half full of tank water, then add the fish. Basically, you want to fill the bag with just enough water to sustain the fish for their journey, and leave as much room for oxygenated air in the bag as possible. Once you’ve filled the bag one-third to one-half full of tank water, scoop up the fish in an aquarium fish net and add it to the bag.
- Get bigger bags if filling them halfway doesn’t provide enough water to cover the fish and allow them some amount of free movement.
- To scoop fish more easily, corral them into a corner of the tank with the scoop, then bring the scoop up from beneath them. Use steady movements instead of jerking motions that might frighten the fish.
- Experienced fish shippers know just how many fish they can fit into a single bag to maximize their efforts. Until you gain that amount of experience, however, it’s much wiser to place only one fish in a bag. You can, however, pack multiple bags into the box.
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Add pure oxygen to the bag, if possible. If you have access to a canister of condensed oxygen, use it to inflate the bag after you’ve added the water and the fish. This will provide the water—and, in turn, the fish—with substantially more oxygen over the span of their journey.
- Otherwise, use a hand pump to fill the bag with room air. This should still be sufficient to sustain the fish for 2-3 days in most cases.
- Don’t inflate the bag by exhaling into it like it’s a balloon. You’ll fill it with carbon dioxide and the fish won’t survive the journey.
3
Secure the top of the bag tightly with rubber bands. Fold the flap over on the top of the bag, then keep wrapping and twisting a rubber band over the folded flap as many times as you can. Add a second or third rubber band for added security.
- While one high-quality bag should do the job, you can add some insurance by double, triple, or even quadruple-bagging the fish. Secure the tops of these extra bags after you’ve sealed the primary bag.

Part 3

Part 3 of 4:

Boxing Fish for Shipping

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1
Place insulating material and the bagged fish in the Styrofoam box. Line the bottom of the box with crumpled newspaper, bubble wrap, or Styrofoam packing peanuts. Then nestle the bag or bags into the Styrofoam box and fill the remaining open spaces with more crumpled newspaper (or other material).
- The packing material surrounding the bag, along with the Styrofoam box itself, provides protection during transport and helps insulate and maintain the temperature of the water inside the bag.
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Add heat/cold packs wrapped in newspaper if necessary. Don’t freeze the cold packs or overheat the heat packs—instead, cool or heat them so they’re just slightly below or above the current water temperature. Then, wrap them in newspaper and nestle them in the insulating material surrounding the bag(s) of fish.
- The insulating material and Styrofoam should be sufficient to maintain the water temperature for at least 24 hours. However, if the box will be exposed to very high or low temperatures during shipping, if the shipping process will take more than 1 day, or if the fish are very sensitive to temperature fluctuations, add a few heat or cold packs.
- Don’t set a bag with fish directly on a heat/cold pack.
- Two heat/cold packs should be adequate for a small fish shipping box.
3
Seal the lid on the Styrofoam box, and place it into the cardboard box. Press the lid securely on the Styrofoam box—it should fit very snugly. For extra security, wrap some packing tape around the seam of the lid. Then, slide the Styrofoam inner box into the cardboard outer box—once again, it should be a very snug fit.
- Use a good-quality packing tape to seal up the cardboard box after you’ve placed the Styrofoam box inside it.
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Add labels, like "fragile," "live fish," and "this side up" to the box. Most boxes designed for shipping fish will already be prominently labeled on the outside. However, it never hurts to grab a marker and add some additional labels.^{[2]
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- If your outer box isn’t pre-labeled, add a prominent “live fish,” “this side up,” and “fragile” notation to each side. Use large, block lettering that’s easy to read.
Write the recipient’s address on the center of the box in large, clear lettering, then include the return address in the upper left corner. Affix any shipping labels as necessary.

Part 4

Part 4 of 4:

Shipping Your Fish

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Use a shipper that accepts live animal shipments. Don’t try to sneak an unlabeled box past a shipping company in order to save a bit of money. You’ll get much better results if you use a company that knows how to deal with live animal shipping. For example:
- The U.S. Postal Service accepts all live fish shipments, so long as you follow their packaging and labeling requirements.^{[3]
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- UPS will usually ship live fish if you give them proper notification beforehand and follow their packaging requirements.^{[4]
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- FedEx doesn’t ship live fish as part of their regular service—they may, however, provide business-to-business service through their Live Animal Desk.^{[5]
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Pay for overnight/express shipping whenever possible. When it comes to shipping fish, the shorter the shipping time, the better. Overnight shipping is usually more expensive, but it gives the fish the best chance of arriving in good health.
- Work with your shipper to arrange for as few transfers and layovers as possible.
- If the fish will be shipped via air for at least part of the journey, try to arrange for climate-controlled storage during air travel.
- If you can get your fish to their recipient within 24 hours, the results will usually be good. 48 hours is more risky but often turns out okay. Longer shipping times become increasingly more dicey.
Contact the recipient and make sure that they will be ready to receive the fish when it gets there. Ideally, they should be able to accept the package directly from the delivery person. That way, they can open the box and start acclimating the fish to their new home right away.

Expert Q&A

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Question

What should I do when I receive the fish?

Joe Perez
Aquatic and Terrarium Specialist
Joe Perez is an Aquatic and Terrarium Specialist and the Manager of the Chlorophyll Corner, based in Tempe, Arizona. Joe has been part of the aquatic and reptile industry and hobby for almost 30 years. His specialty is in creating planted aquariums and full-setup terrariums. The Chlorophyll Corner started as a small family plant store and has grown to a full-planted aquarium shop with an Instagram following of over 82,000 people.

Joe Perez

Aquatic and Terrarium Specialist

Expert Answer

After receiving your live pet fish, begin by drip-acclimating them to their new environment. This process is essential because the pH of the water they were transported in is typically low due to waste buildup during travel, like urine and feces. To drip acclimate, slowly introduce small amounts of your tank water into the bag or container holding the fish over a period of time, allowing them to adjust gradually to the new water conditions.

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Does it matter what kind of bag is used?

Community Answer

It depends how long it takes to get to the customer. Use specially designed breathing bags that allow carbon dioxide to escape and oxygen to enter the bag.

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When you say fill with air or oxygen, do you mean pure oxygen or a scuba dive mix?

Community Answer

What you can do is put the fish in the bag, and try to grab some of the air in the room into the bag, meaning pulling it up, and closing the bag quickly so there is some air or oxygen in the bag. Make sure the bag is half-filled with water, the other half air.

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Warnings

Add only 1 fish per bag, because fish produce waste, which turns into ammonia—and too much ammonia will kill the fish. More fish means more ammonia in the bag water.

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Do not put any food into the bag, as this will pollute the water.

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