How to identify yelloweye rockfish

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Look at this first

Diagnostic — settles it on its own

Each of these settles the identification on its own. If one is clear, you have your answer.

• A saturated yellow iris

  The ring around the pupil is a strong, even yellow rather than a pale straw or a dull gold, and it holds its colour on a fish that has been out of the water for some time. This is the character the common name records and it is the one to check first. Canary, vermilion and copper rockfish all overlap this species in colour and ground and none of them carries an eye like this. Treat it as settling the species when it is paired with the head sculpture below.

• Rasping ridges over the top of the head

  Run a look along the crown between and behind the eyes. There is a set of coarse bony ridges there, rough enough that the fish carries rasphead as a second common name in parts of its range. The ridges are structural, so they are present at every size, they survive handling, and they show in almost any photograph taken from slightly above. Together with the eye they are the pair that closes the identification.

Supporting — use with other characters

Real characters that are not conclusive by themselves. Use two or three together.

• Orange to orange-red body, strongest in old fish

  The ground colour is a deep orange that reddens with age, and it is genuinely striking on a large adult. Rank it below the eye and the head ridges rather than above them: it is the character most likely to send a reader to the wrong species, because canary and vermilion rockfish occupy the same ground in something close to the same colour. Use it as confirmation once the eye has already answered the question.

• A pale stripe along the lateral line — mostly on young fish

  Younger fish carry a distinct white or cream line running the length of the flank along the lateral line, and it fades progressively as the fish ages, so a very old adult may show little or none of it. This makes it useful in one direction only: its presence on an orange rockfish with a yellow eye supports the identification, and its absence rules nothing out. A reader working from a photograph of a small fish will see it clearly; a reader holding a large one may not.

• Strong spines on the head, gill cover and dorsal fin

  The head and gill cover carry hard spines and the first dorsal is stiffly spined. This matters for two reasons at once. It is part of the robust, heavy-headed build that separates this fish from the more streamlined rockfishes, and the spines carry venom, so a reader confirming the identification in hand should be wearing gloves and keeping fingers clear of the dorsal and the gill cover while they do it.

• Size, and what a very large one means

  Ordinary fish run two to six kilos, a good one is eight to fourteen, and the published maximum is around 104 cm and 17.8 kg. Size is supporting evidence here in an unusual way: this species is very long-lived and slow-growing, so a genuinely large fish is an old fish rather than a fast-growing one, and the population consequences of removing it are different from those of removing a large individual of a short-lived species.

Suggestive only — varies with condition

Hints only. These vary with condition, season, water and how long the fish has been out of it, and a fish that contradicts them is still the same species.

• Eastern Pacific, on deep rocky ground

  The range runs from the Gulf of Alaska south to northern Baja California, and within it the fish is a resident of deep rocky structure rather than a rover. Individuals move very little, which is why depletion is local and recovery is slow. Range narrows the candidate list to the Pacific rockfishes and does nothing to separate this species from the dozens of others inside it, so treat it as a frame for the question rather than as an answer.

What it gets confused with

• Canary rockfish, which shares the orange ground and the depth but has a plain dark eye and a smoother head, and whose lateral-line stripe persists into adulthood.
• Vermilion rockfish, similar in colour and much more finely mottled about the head, again without the yellow eye.
• Copper rockfish, browner and blotched rather than evenly orange, and normally shallower.
• Quillback rockfish, which has the heavy spined build and a strongly notched dorsal but is brown and yellow rather than orange-red.

Where this stops working

The full record

This page covers identification only. The Yelloweye rockfish record covers behaviour, lifecycle, distribution, handling and the sources behind all of it.