How long do they live? I’m beginning to believe that the rockfishes, sturgeons, and oreos are all Highlanders. From what little research is out there, we know that the Smooth Oreo can live to at least 100 years old [1].

Where are they found? The Smooth Oreo range is the Southwest and Southeast Atlantic Oceans and the South Pacific Ocean. They are deep water dwellers and are found at 400 meters to 1500 meters down, which is close to 5,000 feet for those of us from the United States [2].

What do they eat? Smooth Oreos probably eat other fish, cephalopods, and shrimp like the Warty and Spiky Oreos, but I could not find any information concerning their diet.

What do they look like? The Smooth Oreo looks a lot like the other Oreos. It was hard to track down a decent picture of this species. See Figure 1. Follow this link for the one good picture I could find. Warning: it’s dead.

pseudocyttus_maculatus_smooth_oreo
Figure 1. The best rendition of a Smooth Oreo I could find for reuse on the internet. If you would like to share your own pictures of any of these species, I’d be happy to have them and credit you.

How do they reproduce? Smooth Oreos reproduce by seasonal spawning [2]. There’s no research, that I could find, addressing sexual maturity age or reproductive senescence of this species.

How do scientists know how old they are? Otolith counts [1].

So what are we lacking? There’s no information regarding the nuclear genome of Pseudocyttus maculatus on NCBI (National Center for Biotechnology Information). An in depth look into the reproductive cycle and biology of the Smooth Oreo would be useful.

Conservation status: Smooth Oreos are listed as Data Deficient on the IUCN Red List.

Please contact me if you have information regarding how these deep dwelling fish share the power of Connor MacLeod, thus proving among fish that there can be more than one.

  1. Stewart, B. D. “Synopsis of the biology of commercially important species of dories and oreos (Order: Zeiformes) in southern Australasian waters: a review of the literature. Department of Conservation and Environment.”Fisheries Division, Victoria. Internal Report 196 (1992).
  2. Fishbase.org. Pseudocyttus maculatus.  http://www.fishbase.org/summary/Pseudocyttus-maculatus.html. Accessed 10/5/2016