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Those checks apply to common fish including salmon, tuna, tilapia, pollock, bass, cod, catfish and trout. Cooking time, color by itself and the cooking method do not replace the temperature check.
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The direct answer: check for 145°F (63°C)
For home cooking, the clearest answer to “How do I know fish is done?” is a thermometer reading. Cook the fish until its internal temperature reaches 145°F (63°C). This is FoodSafety.gov’s listed safe minimum internal temperature for fish, both whole and filleted, in its chart last reviewed November 21, 2024.
FoodSafety.gov describes the temperature and the visual test as alternatives in the fish entry. If you have a food thermometer, use the measurable temperature. If you do not, assess the flesh using both parts of the published fallback: it is no longer translucent and it separates easily with a fork.
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Official guidance: FoodSafety.gov’s Cook to a Safe Minimum Internal Temperature chart.
How to check fish with a food thermometer
A thermometer removes much of the guesswork that comes from judging a piece of fish by sight. Use an instant-read or other food thermometer that can measure the fish’s internal temperature, and follow the thermometer maker’s instructions for positioning and reading the probe.
- Have the thermometer ready before checking. The purpose of the check is to measure the temperature inside the fish, not the temperature of the pan, grill grate, oven air or cooking liquid.
- Measure the fish itself. Place the probe so its sensing tip is in the interior of the fish, using the device’s instructions to obtain a stable internal reading.
- Read the number. The safety target is 145°F (63°C). The same target applies to a whole fish and to a fillet under the cited general guidance.
- If the reading is below 145°F (63°C), continue cooking. Check again after additional cooking rather than treating the fish as finished based only on elapsed time or surface appearance.
- Stop using the visual test as a substitute once you have a temperature reading. The thermometer gives a direct, measurable result; translucency and fork separation are the no-thermometer alternative.
A thermometer is an optional but useful kitchen tool because it lets you check the published target directly. No particular brand or model is required by the FoodSafety.gov guidance.
How to tell when fish is cooked without a thermometer
When you cannot measure the temperature, use the two-part visual and tactile description from FoodSafety.gov:
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- The flesh is no longer translucent. You should not be able to see through the interior in the way you can with raw, translucent flesh.
- The flesh separates easily with a fork. The flakes should part readily when you gently test the fish with a fork.
Use both cues together. A piece that still looks translucent has not met the published visual description, even if its surface looks browned. Conversely, do not treat a change in surface color alone as a more reliable rule; the official fallback is specifically about translucency and easy separation with a fork.
Which fish does the 145°F guidance cover?
The FoodSafety.gov chart gives one general fish entry rather than separate targets for each species. Its examples include the following fish:
| Fish form | Examples named by FoodSafety.gov | Safe minimum internal temperature | Alternative visual and tactile cue |
|---|---|---|---|
| Whole fish | Salmon, tuna, tilapia, pollock, bass, cod, catfish and trout | 145°F (63°C) | Flesh is no longer translucent and separates easily with a fork |
| Fillet | Salmon, tuna, tilapia, pollock, bass, cod, catfish and trout | 145°F (63°C) | Flesh is no longer translucent and separates easily with a fork |
The chart does not publish a different minimum temperature for each listed species. It also does not provide separate targets for different thicknesses, cooking methods or preferred textures. Therefore, do not substitute a species-specific number unless you have separate, authoritative guidance for that particular situation.
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A recipe may give an estimated cooking time, but the cited safety chart does not provide fish cooking times. Time depends on the piece and the cooking setup, so a number of minutes cannot establish that every fish has reached 145°F (63°C).
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Two pieces that look similar can require different amounts of time because their size, shape and cooking conditions differ. A whole fish and a thin fillet also heat through differently. The practical consequence is simple: use time as part of the recipe’s process, then verify doneness with the thermometer or the official visual fallback instead of assuming the clock proves the center is ready.
How to interpret appearance without over-reading it
Translucent versus no longer translucent
Translucency concerns the flesh inside the fish. The official wording does not require a particular shade of pink, white, brown or any other color. It says the flesh should no longer be translucent. Avoid turning that instruction into a color chart for individual species, because the cited guidance does not establish one.
Fork separation
The second cue is physical: the flesh should separate easily with a fork. “Easily” is important. The test is not merely whether a fork can mark the surface; it is whether the cooked flesh parts readily when gently checked.
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Color alone
Surface browning or a change in color can occur during cooking, but FoodSafety.gov does not present color alone as the preferred check. When no thermometer is available, judge the flesh by the combination of translucency and fork separation stated in the chart.
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Whole fish and fillets: what stays the same
The general minimum temperature is the same for a whole fish and a fillet: 145°F (63°C). That does not mean the two forms cook in the same amount of time. The chart supplies one safety target, not a shared timetable.
For either form, the decision sequence is the same:
- Check the interior with a food thermometer when one is available.
- Confirm that the reading has reached 145°F (63°C).
- If there is no thermometer, look for flesh that is no longer translucent and that separates easily with a fork.
Do not infer a lower or higher target merely because the fish is whole, skin-on, boneless or cut into a fillet; those distinctions are not assigned separate temperatures in the cited chart.
Safety guidance versus personal texture preference
The 145°F (63°C) figure is a food-safety minimum, not a promise about a particular culinary texture. People may prefer fish that is firmer, softer or more moist, but the cited source does not establish lower-temperature alternatives, species-specific texture targets or a validated time-and-temperature substitute.
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If your priority is the published safety benchmark, use the thermometer reading. If you are relying on the no-thermometer method, use the exact visual and tactile cues rather than trying to reverse-engineer a preferred color or texture from them.
A practical decision tree
You have a food thermometer
- Measure the internal temperature of the fish.
- At 145°F (63°C), it has reached the chart’s safe minimum.
- Below 145°F (63°C), continue cooking and check again.
You do not have a food thermometer
- Inspect the flesh at the interior, not just the browned surface.
- Confirm that it is no longer translucent.
- Gently test whether it separates easily with a fork.
- If either part of the official fallback is missing, do not treat the visual check as complete.
The outside looks done but the inside is uncertain
Do not let surface color overrule the interior check. Use a thermometer if possible. Otherwise, apply both official visual cues to the flesh itself.
The fish is a species not listed in the examples
The chart’s fish entry is general for whole fish or fillets, and the examples are illustrative rather than a separate temperature schedule for each named species. Use the general 145°F (63°C) target unless you have other authoritative guidance that specifically applies to the fish you are preparing.
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- Relying only on a recipe’s minutes. The chart does not publish a universal cooking time, and time varies with the piece and setup.
- Using surface color as the test. The official fallback is no translucency plus easy fork separation, not a particular outside color.
- Checking only one visual cue. The published fallback contains two parts; use them together.
- Assuming each species has its own chart temperature. The cited entry gives one general minimum for fish whole or fillet and does not list species-specific targets.
- Confusing a preference with a safety minimum. The 145°F (63°C) figure is the safety benchmark in the source, while personal texture preferences are a separate matter.
- Measuring the cooking environment instead of the fish. A pan, oven or grill temperature does not tell you the fish’s internal temperature.
Quick checklist before serving
- Identify whether you are checking a whole fish or a fillet; both use the same published minimum.
- Use a food thermometer whenever one is available.
- Look for an internal reading of 145°F (63°C).
- If no thermometer is available, verify that the flesh is no longer translucent.
- Verify that the flesh separates easily with a fork.
- Do not replace these checks with a cooking-time estimate or color alone.
What the official chart does—and does not—tell you
FoodSafety.gov’s chart gives a concise answer to the doneness question: fish should reach 145°F (63°C), or it should be no longer translucent and separate easily with a fork. It covers fish whole or fillet and names salmon, tuna, tilapia, pollock, bass, cod, catfish and trout as examples.
It does not provide separate numbers for each species, thickness, method or preferred texture. It does not provide cooking times. Those limits matter because they prevent a general safety target from being mistaken for a complete recipe timetable or a species-by-species texture guide.
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