How to Evacuate or Transport Fish During a Hurricane

You cannot evacuate the tank, so move the fish. Bag or bucket them in 75 to 80 percent of their own tank water, add a battery air pump for anything past a short trip, skip feeding for 24 hours beforehand, and save a handful of established filter media. NC State’s veterinary guidance says sparsely packed fish should survive at least 36 hours if the temperature is adequate. That may cover a trip to a shelter or an inland home, but it is not a promise.

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Fish are easy to leave off a hurricane checklist. The dog has a leash and the cat has a carrier, but the 40-gallon community tank gets a shrug, because an aquarium clearly cannot come with you. The fish still have to go somewhere, and they lose ground fast once the heater and filter stop and the water runs low on oxygen. This page covers what you actually move, how much water and how many containers your stock needs, how to pack it, the two clocks that run against you (oxygen and ammonia), and the shelter-in-place fallback for when you truly cannot take them.

The ASPCA’s disaster rule is blunt: “DO NOT LEAVE YOUR PETS BEHIND”, because conditions that are unsafe for you are unsafe for them. The federal PETS Act of 2006, passed after Hurricane Katrina, amends the Stafford Act to ensure that state and local emergency plans address the needs of people with household pets and service animals, per the AVMA. Whether a public shelter accepts fish is a separate question, so ask your destination ahead of time.

You move the fish, not the tank

There is no version where the assembled aquarium travels. It is heavy, it sloshes, it needs powered heat and filtration you cannot run in a car, and a half-full tank in motion is a broken-glass hazard. Aqueon, an aquarium-equipment manufacturer, builds its moving guide on the same idea: transport the fish in their water and break the tank down or leave it.

The glass, stand, gravel, decor and even the filter housing are replaceable. Three things are not, in this order:

• The fish themselves.
• The tank water, because it carries the chemistry your fish are adjusted to.
• The established filter media (sponge, ceramic media or filter floss), because it holds the living bacteria colony that keeps a tank safe. That colony takes weeks to rebuild and cannot be bought off a shelf.

Decide now: take them or shelter them in place

Decide before a storm is named which plan you are running, because they need different gear.

Plan A, take them with you. This is the default when you are evacuating to a shelter, a hotel or an inland home, and it is the rest of this page.

Plan B, shelter them in place. Sometimes the fish cannot come: a human-only shelter, a car already full, a tank too large to bag in the time you have. The fallback is to leave the fish in the tank with a battery-powered air pump that switches on automatically when the grid drops, a closed and insulated tank, and no feeding. Our aquarium and reptile power-outage guide covers that method, including aeration timing and heat-pack math. It only helps if the water itself does not flood or freeze, so it is the weaker option where flooding is the threat.

If you are weighing which animals move first when you cannot grab everyone, our pet evacuation grab-order framework puts life-support-dependent animals like fish and reptiles in context.

How to pack fish to travel

Bag the small fish

For small-to-medium fish, Aqueon’s method is to fill each bag 1/3 with water and 2/3 with air (pure oxygen is better than air if you have it), double-bag to prevent punctures, and lay the bags on their side for more swimming space. NC State’s Dr. Gregory Lewbart uses the same ratio and gives the number that matters most for planning: sparsely packed fish, about 5 inches of fish per gallon, should survive at least 36 hours at an adequate temperature. Do not crowd the bag. Overpacking is the fastest way to shrink that window.

Bucket or cooler the larger fish

Aqueon puts larger fish, and tank creatures that do not bag well, in buckets, tubs or coolers. Aqueon says moving tank water is best done in 5-gallon buckets with snap-on lids. Fill it with the existing tank water, not fresh water, and keep 75 to 80 percent of the tank water when you move fish. That preserves the beneficial bacteria and the chemistry your fish are acclimated to, which reduces stress far more than a clean bucket of tap water would.

Save the filter media

Before you drain the tank, pull a handful of established filter media and seal it in a bag or container of that same tank water. Aqueon says to keep filter media wet in aged aquarium water or a sealed container so the nitrifying bacteria stay alive. People skip this step and regret it. After the storm, that media reseeds a new setup in a fraction of the time it takes to cycle from zero.

How much water, how many containers

Count containers before the storm. The arithmetic takes five minutes on a calm evening and is hard to do at 5am with the wind coming up. Tape the answer inside the tank stand.

1. Count your stock in inches, not gallons. Add up the body length of every fish. The number on the box is the tank’s rating; what you move is fish.
2. Turn inches into gallons of transport water. NC State’s transport figure is sparse packing, five inches of fish per gallon, the density its at-least-36-hours window assumes. Dividing your total inches by five gives the gallons of tank water to carry. That division is our arithmetic on NC State’s figure, not a published formula, and it is a floor. More water per fish is the safer error.
3. Check it against the tank you have. Aqueon says to save 75 to 80 percent of the tank water, which caps what is available. Measure by what you can fill, since gravel, rock and the gap under the rim take a share.
4. Convert gallons into containers. Aqueon fills bags 1/3 with water and 2/3 air (or 50 percent water and 50 percent pure oxygen if a local fish store packs them for you). A gallon-size bag at the one-third mark carries roughly a third of a gallon, so figure about three bags per gallon. For buckets, Aqueon says 5-gallon buckets with snap-on lids.
5. Weigh it before you trust it. NC State notes a gallon of water weighs 8 pounds, which puts a five-gallon bucket near 40 pounds of water before the bucket, lid, pump or fish. Aqueon’s lift test for the tubs it says to use for transporting water, gravel or rockwork is the honest test here too: make sure they are sturdy and you can pick them up when they are filled. If you cannot, you need more containers, not a stronger grip.

Total inches of fish	Transport water at 5 inches per gallon	Gallon-size bags at 1/3 water	5-gallon buckets (our arithmetic)	Water weight at 8 pounds per gallon
10 inches	2 gallons	about 6	2	about 16 pounds
25 inches	5 gallons	about 15	2	about 40 pounds
60 inches	12 gallons	about 36	4	about 96 pounds

The bucket column is our own arithmetic, not a published packing standard: gallons divided by five, rounded up, plus one, because no container travels filled to the rim and you want a spare. Splitting the load across more containers is not only about lifting. Fewer fish per container is the first ammonia lever the shipping literature names, covered below.

Aeration and the real survival window

NC State names two variables for survival, temperature and oxygen. Its guidance gives generous temperature margins but stresses not feeding (in warmer months, digestion uses oxygen) and adding oxygen by stirring or whisking the water surface. A bag holds an air pocket; a lidded bucket does not, so aeration matters more in a bucket.

Two rules protect your oxygen supply:

1. Do not feed before or during transport, and start the fast a full day early. NC State says that in warmer months eating and digesting use valuable oxygen, and that uneaten food only pollutes the water with nitrogen. Most fish, per NC State, survive days or even weeks without food, so a fast costs them nothing. Aqueon puts a number on it: refrain from feeding for 24 hours before the move. Aquarium Co-Op’s outage guidance opens the same way: in the first hours, do nothing, and above all do not feed.
2. Add mechanical aeration for anything past a short trip. Aqueon recommends battery-operated air pumps in containers with large fish, on moves over long distances, or in hot weather. A pump that senses power loss and switches on by itself is worth more than one you must remember to run, because your attention is elsewhere during an evacuation.

On temperature, NC State says tropical and temperate fish usually tolerate water in the high 80s to low 90s Fahrenheit for a day or more, and most tropical fish tolerate the low 60s or high 50s for several hours. A normal evacuation drive is rarely a temperature emergency on its own. It becomes one when the container bakes in direct sun or freezes in a winter storm, so the container and its insulation come next.

This method is built for hours, not days. For a genuine cross-country relocation, Aqueon’s guidance is to consider re-homing fish and restocking after you settle, or to ask a local fish store about boarding and overnight specialist shipping. Our moving long distance with pets guide covers that recommendation.

Runtime is not drive time

The number a pump has to beat is the whole gap between the last minute of filtration at home and the first minute of filtration where you land. That includes loading, traffic, the wait for a shelter slot and the hours before there is a working tank. Add those up honestly, then compare the total to what the manufacturer publishes.

• Aquarium Co-Op’s rechargeable battery-backup pump publishes about 20 hours of continuous runtime on a charge, and 40 hours or more in a power-save mode that cycles the air 15 seconds on and 15 seconds off. The same product page says units sold before August 1, 2024 run 8 and 16 hours instead, so a pump in a closet since before that date may have less than half the runtime you expect. It runs on USB and can be powered from an external battery bank, which keeps working in a vehicle.
• The Penn-Plax unit in our picks below has the longest published figure on this page. Penn-Plax’s product page for the SAB11 says that, depending on the batteries used, the pump can provide an uninterrupted supply of oxygen for 72 hours or more. That number is battery-dependent in Penn-Plax’s own wording, so stage a fresh set of D cells with the bucket. Penn-Plax also says to press the ON button on the side so the pump auto-activates on power failure, and to test it periodically by unplugging it from the wall.

Retail listings and manufacturer pages often use different model names. The listing title for this pump carries no model code, while Penn-Plax indexes it as SKU SAB11, UPC 030172290459, under the name Cascade Silent Air Battery Air Pump 11. Search the SKU or the UPC when checking a spec and at checkout.

Our aquarium and reptile power-outage guide carries the side-by-side of what each pump maker publishes.

Temperature, darkness and keeping them calm

Once the fish are packed and aerated, hold conditions steady until you arrive.

• Insulate the container. An insulated cooler, or a bucket wrapped in towels or blankets, slows the temperature swings NC State flags as one of the two survival variables. Aquarium Co-Op recommends the same logic for a tank riding out an outage in place: a tight lid and blankets to hold temperature.
• Keep it dark and covered. A lid or towel blocks direct sun, which Aqueon warns can overheat the water, and darkness limits the visual stress of a moving vehicle.
• Do not chase perfect temperature with heat you cannot control. In a cold-weather evacuation, insulate first and use sealed warm-water bottles as a bridge, not anything that could overheat a small volume of water fast. The cold-weather method, including heat-pack ratios, is on our aquarium and reptile power-outage guide.

The ammonia clock starts a day early

Ammonia is a second clock, and it starts before you pack. Fish excrete ammonia across the gills continuously. In the tank, the filter’s bacteria consume it as fast as it appears. In a bag or bucket, nothing does that job. The Southern Regional Aquaculture Center’s shipping publication, by three University of Florida authors, puts it this way: “In a sealed bag other methods must be used.” Four of the methods it lists are things a household can do in a driveway: fewer fish per container, food withheld before departure, a shorter trip, and water held toward the lower end of the range for the species. A fifth, adding a product that removes ammonia from the shipping water, is a store trip.

• Stop feeding a full day before you pack. SRAC says to withhold food for at least 24 hours before shipment so fish empty their digestive tracts, which sharply reduces the waste they produce in transit. It notes larger fish take longer. Aqueon reaches the same number in ordinary aquarium moving: “Refrain from feeding fish for 24 hours before the move.” It is the only step on this page that must happen while the storm is still a forecast cone, which is why it gets missed.
• Split the load across more containers. Reducing fish per container is the first lever SRAC names, and it is free.
• Cool is slower, but only within the species’ range. SRAC lists the lower end of a species’ range as an ammonia lever, because slower metabolism produces less waste. NC State’s tolerance figures are the floor: the low 60s or high 50s Fahrenheit for several hours for most tropical fish.

Why there is no ammonia-at-hour-six number

Nobody publishes one. SRAC declines to print exact safe loading numbers, saying the weight of fish that can safely be shipped depends on too many factors, and it cites published rates that vary more than tenfold by species, from 22 grams per liter for neon tetras to 272 grams per liter for goldfish. A number that swings tenfold between two common aquarium fish cannot become one countdown for your bucket.

What SRAC does say about time is directional: shipments that take hours can carry a higher density than shipments that take days. A 90-minute run inland and a three-day displacement are not the same packing problem. If your trip will stretch, the correction is fewer fish per container, not a bigger bucket of the same crowd.

SRAC describes sealed bags inside insulated boxes on airplanes, not a lidded bucket in a footwell with a pump running. None of the sources on this page measures the household version, so treat the direction of each lever as transferable and the specifics as belonging to SRAC’s setting.

What an ammonia test kit tells you

Per UF/IFAS Extension, commercial ammonia test kits report total ammonia nitrogen in milligrams per liter (the same as parts per million), which includes both the harmless ionized form and the toxic un-ionized form. UF/IFAS says tissue damage can occur any time the un-ionized share is higher than 0.05 mg/L, and that sensitive fish typically die at 2.0 mg/L. That share rises with pH and temperature, so the same total reading is more dangerous in warm, high-pH water than in cool, low-pH water.

For a high reading in an unfiltered container, NC State’s guidance is to test for elevated ammonia and, above 1 ppm, to change 10 to 30 percent of the water. Neither is a substitute for shortening the trip.

The riskiest five minutes is unpacking

SRAC describes the container at the end of transit: pH is often much lower than it started because carbon dioxide has built up, ammonia may be elevated, dissolved oxygen may be low, and the temperature no longer matches the water you are about to add. Raising pH turns stored ammonia into its toxic form, and SRAC warns that suddenly increasing pH in a bag holding a high ammonia concentration can cause problems. Dumping fish into a freshly conditioned tank is the fast way to do that.

SRAC’s handling on arrival transfers to a motel bathtub or a rebuilt tank:

• Open containers slowly, in a dimly lit area, since the fish have been in the dark.
• Add the new water to the transport container gradually rather than moving the fish into the new water.
• Float the container in the receiving water first, if you can, to equalize temperature.
• Let the acclimation take as long as 30 minutes, per SRAC, and watch the fish the entire time.
• Do not feed on arrival. Aqueon says no food for 24 hours after the move, and warns that a moved tank commonly runs an ammonia and nitrite spike while the biological balance re-establishes, which is another reason to carry the filter media.

What to carry out the door

• The fish, bagged or bucketed in 75 to 80 percent of their own tank water.
• A sealed bag of established filter media in that same water, to reseed a tank later.
• The battery air pump and a fresh set of batteries, if you are bucketing.
• Any medication or water conditioner small enough to grab, since you will re-establish water quality at the other end.

You are not saving the setup. You are saving the living animals and the living bacteria, and the water that keeps both stable in transit.

The shelter-in-place fallback

If the fish cannot come, shelter-in-place is a legitimate second choice for wind-and-power storms where flooding is not the main threat. Leave the fish in the tank, fit a tight lid, insulate it, do not feed, and run a battery air pump that auto-activates on power loss, aerating on the schedule NC State and Aquarium Co-Op describe. The full version, with its own timeline and gear list, is on the aquarium and reptile power-outage guide. Shelter-in-place protects against heat and oxygen loss, not against water coming into the house, so it is the wrong call when the forecast is storm surge or flash flooding.

Realistic time limits

No source on this page gives a precise, temperature-indexed countdown for evacuating fish, so this page offers none. What the sources support:

• A properly bagged, sparsely packed fish survives at least 36 hours at an adequate temperature, per NC State. That can cover a trip to a shelter or an inland home.
• Overcrowding, no aeration or overheating all shrink that window. No source quantifies by how much, so treat 36 hours as a ceiling under good conditions, not a promise.
• 36 hours is an oxygen-and-temperature figure, not a water-quality one. NC State presents the window and its water-quality warning as separate items, and none of the sources combines them into one curve. Ammonia runs on the separate clock above.
• Beyond a day or so, this stops being the right method. Aqueon draws the line at genuine cross-country distance and recommends re-homing or specialist shipping. If your displacement will run for days with no way to set up even a temporary tank, talk to a local fish store before the storm.

The goal is not to keep fish alive indefinitely in a bucket. It is to get them through the trip with the best odds the published guidance supports, and to be honest about where those odds end.

Before-the-storm checklist

• Decide whether your plan is take-them (Plan A) or shelter-in-place (Plan B), and stage the gear for it.
• Do the container math once: total inches of fish divided by five is your gallons. Write the container count on tape inside the tank stand.
• Keep clean 5-gallon buckets with snap-on lids, fish bags and an insulated cooler where you can grab them fast, and count them against that number, not the tank.
• Stage a battery air pump with fresh batteries, ideally one that auto-activates on power loss, and check its published runtime against the whole displacement. Arm and test it as its maker instructs: on the Penn-Plax pump, auto-activation works only once you press the ON button, and Penn-Plax says to test it by unplugging it from the wall.
• Stop feeding 24 hours before you expect to pack, per Aqueon and SRAC.
• Know where you are going. Not all shelters take pets, so per the ASPCA identify a pet-friendly destination ahead of time.
• Never leave a pet behind, per the ASPCA, and bring animals indoors at the first sign of a disaster, per the AVMA, so no one is missing when you load up.

Want the go-bag list on paper? Get the free printable go-bag checklist.

Where to go next

This page is the fish-transport spoke of our pet emergency playbooks hub. If you are keeping fish or reptiles through a power outage instead of evacuating, our aquarium and reptile power-outage guide covers the aeration timeline, battery-pump specs and heat-pack math. For the whole household when the lights go out, see pets and power outages. When you cannot grab every animal at once, which pet do you evacuate first puts life-support-dependent pets like fish in order.