Why dead-on-arrival rate is the number that matters

For any importer of marine ornamental fish, the single most important figure on an invoice is not the price per fish — it is the dead-on-arrival, or DOA, rate. A shipment bought at an attractive unit price loses all its value if a third of the box arrives dead, and a slightly more expensive supplier who consistently lands fish at under 2% DOA is, in real terms, far cheaper. At Bluefields Aquatics we treat sub-2% DOA as a standard rather than a goal, and this guide explains exactly how that figure is achieved so that you, as a buyer, know what to look for in any exporter.

DOA is the product of a long chain of decisions that begins on the reef and ends when your courier hands over the box. A single weak link — a stressed fish, an underweight oxygen charge, a delayed connection — can undo everything that came before. Understanding the whole chain is what separates a reliable marine fish exporter from a gamble.

It starts at collection, not packing

Most DOA problems are decided before a fish ever reaches the packing table. Fish that are chased, crowded, or caught with chemicals carry hidden stress and internal damage that does not show for days. Our divers hand-net every specimen using sustainable, non-destructive methods, as described in our guide to sustainable marine fish collection in Kenya. A net-caught fish that is brought up slowly, given proper surface intervals, and rested before transport is a fish that will travel.

From the reef the fish enter our holding systems, where the real conditioning happens. Newly collected fish are not shipped immediately; they are settled, observed for feeding, and screened for disease across our quarantine and holding stages. A fish that refuses food or shows early signs of infection never enters a shipment. This patience is the most underrated factor in low DOA — and it is the first thing a serious buyer should ask an exporter about.

Conditioning and purging before shipment

In the days before a fish is packed, it is deliberately fasted. An empty gut produces far less ammonia in a sealed bag, and ammonia build-up is one of the principal killers in transit. Fish are typically purged for 24 to 48 hours depending on species and size. Larger, messier feeders such as triggers and large angels need longer; small reef species need less. Skipping this step is one of the most common causes of avoidable losses, because a freshly fed fish can foul its own water within hours.

Water quality in the holding system in the final days also matters. Fish moved straight from poor water into a bag arrive already compromised. Our systems are maintained at stable salinity, temperature and pH, with biosecurity protocols that keep pathogen pressure low throughout the facility.

The packing itself

Packing is where craft meets chemistry. Each fish is bagged in an appropriate volume of clean, temperature-matched saltwater, with the water-to-air ratio tuned to the species and the length of the journey. The bag is then charged with pure oxygen — never just room air — a subject we cover in depth in our oxygen bagging guide. Spiny species such as lionfish, surgeonfish and triggers are double or triple bagged so that a single spine cannot deflate the whole package.

The full mechanics of bag sizing, water volume, insulation and box construction are set out in our professional packing guide. What matters for DOA is that every one of these variables is matched to the actual transit time of your route, not to a generic template.

Route and timing

A perfectly packed fish can still die if it sits on a tarmac for twelve unplanned hours. Choosing the right airline and routing is therefore part of DOA management, not a separate logistics problem. We plan shipments around the shortest reliable connections from Mombasa and Nairobi, and our airline choices are explained in the airlines guide. A box that reaches you in 18 hours has a dramatically better survival profile than one that takes 36, regardless of how it was packed.

What the importer controls

Roughly the last 5% of the survival chain is in your hands. Fish should be acclimated correctly on arrival — slowly, in dim light, with attention to temperature and pH — as set out in our acclimation protocol. Bags that are opened in bright light and dumped into a bright tank can lose fish that travelled perfectly. Learning to read the early signs of shipping stress lets you intervene before a tired fish becomes a dead one.

How to judge an exporter on DOA

When you evaluate any marine fish supplier, ask three direct questions. First, what is their typical DOA rate, and will they put it in writing? Second, how do they handle a claim when losses do occur — do they credit fairly and quickly? Third, can they describe their conditioning and packing process in specific terms, or do they answer in vague reassurances? A genuine sub-2% operation can explain exactly why its fish travel.

At Bluefields, every shipment is logged, every loss is reviewed, and our packing is adjusted continuously against real arrival data. That feedback loop is why our DOA stays low season after season. If you would like to see how we work before committing, request our weekly stocklist or contact our export team to discuss a trial order.

Frequently Asked Questions

What is a good DOA rate for marine fish shipments?

A strong marine fish exporter holds dead-on-arrival rates under 2% on most shipments. Anything consistently above 5% suggests problems in collection, conditioning, packing or routing. Bluefields treats sub-2% as a standard rather than an aspiration, achieved through hand collection, careful purging, pure-oxygen bagging and short, planned air routes. When comparing exporters, ask for their typical DOA figure in writing and how they handle a claim when losses do occur.

Who is responsible if fish arrive dead?

Responsibility is usually shared and depends on where the failure occurred. A reputable exporter stands behind its packing and will fairly credit losses caused by its own process, while the importer is responsible for prompt customs clearance and correct acclimation. Clear photographs of any dead-on-arrival fish, taken before disposal and sent quickly, are the basis of any fair claim. Agreeing this policy before your first order prevents disputes later.

Does a lower price mean higher DOA?

Not always, but a suspiciously low price often hides cut corners that raise DOA — skipped purging, air instead of pure oxygen, or cheap multi-leg routing. The true cost of a shipment is the landed cost of the fish that arrive alive and healthy, not the headline unit price. A slightly higher price from an exporter with a proven sub-2% record is usually cheaper in real terms once losses are counted.

How can I reduce DOA on my end?

The importer controls the final stretch. Arrange customs clearance in advance, collect the box the moment it lands, and follow a careful acclimation protocol — dim lights, matched temperature, slow chemistry adjustment, and netting fish out of bag water. Have a quarantine system ready and avoid feeding or displaying fish too soon. Reading early shipping stress lets you intervene before a tired fish becomes a loss.

Why does conditioning before shipping matter so much?

A fish that is fasted for 24 to 48 hours before packing produces far less ammonia in its sealed bag, and ammonia build-up is one of the main killers in transit. Conditioning also means the fish has been observed feeding and screened for disease, so only healthy animals enter a box. This upstream patience is the single most underrated factor in low DOA, and it is the first thing a serious buyer should ask an exporter about.