White Seabass (Atractoscion nobilis)

A grilled fillet of white seabass (Atractoscion nobilis) served at a California bistro. (Image Credit: Ben Young Landis/CC-BY)

A grilled fillet of white seabass (Atractoscion nobilis) served at a California bistro. (Image Credit: Ben Young Landis/CC-BY)

A surprise lunch outing at one of our many great local bistros in Sacramento, California, yielded its own surprise — a “white bass” listed on today’s specials.

White bass (Morone chrysops). (Image Credit: Utah Division of Wildlife)

White bass (Morone chrysops). (Image Credit: Utah Division of Wildlife)

Confusingly, “white bass” in the United States can refer to Morone chrysops, a freshwater fish found in the Mississippi River basins and elsewhere in North America. It’s a small (maxing at 6 pounds/3 kg) but popular sportfish. (Random trivia: white bass is the state fish of Oklahoma!)

But being in California, there was a chance that this “white bass” was actually referring to Atractoscion nobilis, better known as “white seabass”. This is an unrelated, marine species found along the Pacific coast of North America, and a much larger creature — as you can see below — growing up to 93 pounds (42 kg).

An adult white seabass (Atractoscion nobilis) at the Birch Aquarium in La Jolla, California. (Image Credit: D. Ross Robertson)

An adult white seabass (Atractoscion nobilis) at the Birch Aquarium in La Jolla, California. (Image Credit: D. Ross Robertson)

A party boat captain shows off a white seabass (Atractoscion nobilis). (Image Credit: Barbara McIntyre)

A party boat captain shows off a white seabass (Atractoscion nobilis). (Image Credit: Barbara McIntyre)

I had a feeling that the restaurant was offering white seabass, and ordered the special to find out.

The cut (as you can see in the top photo) looked like only half of a fillet, probably from the dorsal (top) half of the fish. But this cut easily measured 5 inches (12 cm), meaning the original fish measured at least twice that length from belly to top — at least the girth of a big pineapple. This fillet probably came from a large fish.

The flesh itself was moderately firm, juicy with a very sweet, clean flavor, reminding me of redfish (Sciaenops ocellatus) I have tasted in the eastern United States. Which would be fitting — redfish and white seabass are both large species from the family Sciaenidae.

The final confirmation came from asking the waitress, to whom I asked, “Where do you get your white seabass?”

After asking the kitchen, the waitress passed on an answer: “the white bass is found in Baja, but you can get it as the fish moves up north along California.”

I got the clues I needed to make my best guess, and thanked her with a smile. White seabass.

*     *     *     *     *

A juvenile spotted drum. (Image Credit: Laszlo Ilyes)

A juvenile spotted drum. (Image Credit: Laszlo Ilyes)

Now, compare the white seabass with another member of the drum and croaker family we explored recently — the spotted drum (Equetus punctatus). One is a humongous beast nearly the size of a human, cruising in schools in kelp forests, while the other is a wildly patterned tropical fish hiding about in coral reefs.

Amazing how one type of fish can adapt and evolve into such widely different forms!

And speaking of amazing — when we last talked about the Sciaenidae, we never delved into an example of their drumming and croaking. I managed to find these two clips on YouTube, purported to be that of our white seabass:

Sounds like a pasture full of cows!

For those of you not sensitive about watching a speared animal in its dying moments, here is a clip of a white seabass croaking after being speared.

Drums and croakers produce these sounds by activating muscles near their swim bladder — an air-filled organ found inside many fish that help them maintain buoyancy, so they do not sink or float too quickly when they stop swimming.

Contraction of the muscles cause the swim bladder to vibrate and generate sounds. A seemingly exhaustive overview of sound production in Sciaenidae can be found in Ramcharitar et al. 2006.

Male white seabass are the crooners — singing of course, to the ladies.

Male white seabass sound production peaks with spawning season, possibly to help individuals of the same species gather into spawning groups, and for males to attract females within those groups (Aalbers 2008). Researchers have observed five different types of sounds — “thuds” and “drumrolls” among them — including a “chant” that happens when male fish release sperm into the water, possibly as a signal to females to synchronize the release of their eggs, so they can mix with and be fertilized by the sperm (Aalbers and Drawbridge 2008).

There’s even research looking into using underwater sound recorders to detect and track white seabass sound patterns (Aalbers and Sepulveda 2012). Given its popularity for food and sport, recreational and commercial fishery for the white seabass is managed in the State of California. If acoustic recorders can help detect peaks and patterns in white seabass courtship sounds — and thereby alerting fishery managers to high spawning activity — fishery managers can design optimal harvesting policies that protect white seabass during their peak spawning periods, while satisfying the needs for sportfshing and commercial fishing during other times of the year.

Phew. How did we get talking about fishery regulations and fish mating calls? Oh right, from a “fish of the day” special scrawled on a restaurant chalk board.

It’s funny the things you can discover and learn, just by paying a little more attention to a fish fillet…

Atractoscion nobilis (Ayres, 1860)
White Seabass (click for names in other languages)

Class Actinopterygii (Ray-finned Fishes)
Order Perciformes (Perch-like Fishes)
Family Sciaenidae (Drums and Croakers)

FishBase Page: http://fishbase.org/summary/Atractoscion-nobilis.html

Citations

Aalbers, SA. 2008. Seasonal, diel, and lunar spawning periodicities and associated sound production of white seabass (Atractoscion nobilis). Fishery Bulletin 106(2): 143-151.

Aalbers, SA, MA Drawbridge. 2008. White seabass spawning behavior and sound production. Transactions of the American Fisheries Society 137(2): 542-550. doi: 10.1577/T04-058.1

Aalbers, SA, CA Sepulveda. 2012. The utility of long-term acoustic recording system for detecting white seabass Atractoscion nobilis spawning sounds. Journal of Fish Biology 81: 1859-1870. doi: 10.1111/j.1095-8649.2012.03399.x

Ramcharitar, J, DP Gannon, AN Popper. 2006. Bioacoustics of fishes of the family Sciaenidae (croakers and drums). Transactions of the American Fisheries Society 135: 1409-1431. doi: 10.1577/T05-207.1

— Ben Young Landis

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