How long do they live? Pacific grenadier have been verified to live 73 years and they can likely live much longer than this [ 1, 2]. This is a species that needs a lot of research.

Where are they found?  Pacific grenadiers are usually found 3,000 to 4,000 feet below the ocean surface of the North Pacific Ocean, which is not exactly the easiest depths to explore [3].

What do they eat? They enjoy a diet of smaller creatures, such as small fish, prawns, and cephalopods [4].

What do they look like? Unlike most of the long-lived fish, Pacific grenadiers do not get very large and most are around 1.5 feet long [5]. They are slim and silvery. Check out Figure 1 for a better idea of what to look for if you’re ever in deep, frigid North Pacific Ocean waters.

Figure 1. Coryphaenoides acrolepis.

How do they reproduce? This is where I hit a wall. The only information I could find is that these fish are oviparous and release larvae [6]. There’s no information about sexual maturity, reproductive rate, or senescence.

How do scientists know how old they are? Otolith estimations and radiometric validation [1, 2].

So what are we lacking? This requires bullet points:

  • The reproductive maturity, fecundity,  and reproductive senescence data are needed.
  • The population and conservation status of this species has not been evaluated (this could have something to do with that whole “deep sea” thing).
  • There is no information on the NCBI website for the Pacific grenadier.
  • In other words, we know it lives a long time and likely a really long time, but we don’t know anything else.

If you have information that could fill in some of the gaps for this species please send me an email or leave a comment!

 

  1. Andrews, A.H., G.M. Cailliet and K.H. Coale, 1999. Age and growth of the Pacific grenadier (Coryphaenoides acrolepis) with age estimate validation using an improved radiometric ageing technique. Can. J. Fish. Aquat. Sci. 56:1339-1350
  2. Cailliet, G. M., et al. “Age determination and validation studies of marine fishes: do deep-dwellers live longer?.” Experimental gerontology 36.4 (2001): 739-764.
  3. Fishbase.org. Coryphaenoides acrolepis. http://www.fishbase.org/summary/8467 Accessed 2/15/2017.
  4. Cohen, D.M., T. Inada, T. Iwamoto and N. Scialabba, 1990. FAO species catalogue. Vol. 10. Gadiform fishes of the world (Order Gadiformes). An annotated and illustrated catalogue of cods, hakes, grenadiers and other gadiform fishes known to date. FAO Fish. Synop. 125(10). Rome: FAO. 442 p.
  5. Tuponogov, V.N., 1993. Grenadiers. P. 112-116 in F.S. Terziev (Ed.). Project “The seas”. Hydrometeorology and Hydrochemistry of the seas. Vol. 9. Sea of Okhotsk. Sankt-Peterburg, Gidrometeoizdat.
  6. Ambrose, D.A., 1996. Macrouridae: grenadiers. p. 483-499. In H.G. Moser (ed.) The early stages of fishes in the California Current region. California Cooperative Oceanic Fisheries Investigations (CalCOFI) Atlas No. 33. 1505p.