How long do they live? I hate to sound like a broken record, but we just don’t know how long this fish can live. Through otolith annuli counts researchers found that the oldest dead fish was 99 years old [1]. Speaking of dead fish, there’s a reason the click through picture is of a dead Yellowmouth rockfish – there are no pictures of one alive. Actually, there are only nine pictures that I could find with a quick Google search and all nine pictures were of dead fish. Of those nine pictures, one is on a cutting board. I find it a bit odd that we’re not certain how long this organism can live and we do not have any live pictures of it, but we sure know how to kill them. Somewhere inside my cold, black heart, an ice cube just formed.

Where are they found? Yellowmouth rockfish have been found in the Gulf of Alaska to northern California from 330 feet to a little over 1,400 feet deep [2].

What do they eat? I want to believe that Yellowmouth rockfish eat the occasional fisherman that is over his catch limit, but since there’s no information available I’m going to guess that they eat smaller fish, squid, and copepods like other rockfish.

What do they look like? They are a pinkish-red color and even though it looks like other rockfish it has one cool difference: yellow and black blotches on its mouth. The maximum length recorded for this species is 22 inches [3]. See figure 1.

Figure 1.  Yellowmouth rockfish, which look like Pacific Ocean Perch.

How do they reproduce? Yellowmouth rockfish are ovoviviparous (eggs within, but hatch into larvae while still inside the mom) and the female releases live larvae into the water [3].  This could just be a misprint since the other rockfish are listed as viviparous. That’s all the reproductive information that I could find about Yellowmouth rockfish.

How do scientists know how old they are? Otolith annuli counts were taken by the Department of Fisheries and Oceans Canada [1]

So what are we lacking? Meeting our potential as humans and using this amazing conscience mind to make the world a better place rather than squandering our very existence for little more than a bank account, some useless stuff, and the ability to say we passed along our basic ass genes. There’s nothing indicating reproductive maturity ages for Yellowmouth rockfish. There’s also no information regarding reproductive senescence. Considering this is an important commercial fishery species, the conservation status is much needed. It would be nice to see some pictures of a live Yellowmouth rockfish. The Rockfishes of the Northeast Pacific mentions mitochondrial DNA sequencing data, but currently it is not uploaded to the NCBI website. Nuclear genome information is lacking as well.

Conservation status: This species of rockfish has not been evaluated by the IUCN Red List, even though it’s important for commercial fisheries.


  1. Shayne MacLellan, Department of Fisheries and Oceans Canada, Pacific Biological Station, Nanaimo, BC, Canada.
  2. Love, Milton S., Mary Yoklavich, and Lyman K. Thorsteinson. The Rockfishes of the Northeast Pacific. Pages 242. Univ of California Press, 2002.
  3. Sebastes reedi. Accessed 10/6/2016