Potomac Valley Aquarium Society

Potomac Valley Aquarium Society The Potomac Valley Aquarium Society is a not-for-profit educational and social organization for the

PVAS meets the first Saturday of the month from 1 - 5 pm at the Green Acres Center in Fairfax, VA. Exceptions are the Spring and Fall All-Day Auctions in April and October which are held on Sundays, and the July Bowl Show which is held the second Saturday.

Operating as usual

Photos from Glen Echo Park Aquarium's post

Photos from Glen Echo Park Aquarium's post


Angelfish have long been a staple of the aquarium hobby! Learn everything you need to know about caring for these elegant beauties.


Hi all. Just got word that Chris Gazdick had a family emergency and can’t make it, so we’ll have another speaker. Details on the PVAS Wen site.

Photos from James River Aquarium Society's post

Photos from James River Aquarium Society's post

Interesting study about how fish navigate. Worth getting past the curiosity gap headline and the rambling lead.
Why Researchers Turned This Goldfish Into a Cyborg

Interesting study about how fish navigate. Worth getting past the curiosity gap headline and the rambling lead.

Neuroscientists are examining how fish navigate their world using different brain circuits than those relied on by mammals like us.

Check out the colors of these breeding male longear sunfish.
Discover Nature: Missouri Fish

Check out the colors of these breeding male longear sunfish.

Color is important to fish. It’s used for camouflage, mate selection and defense. While easily seen in tropical aquarium fish, our native fishes also have special colors.


Happy National Volunteer Appreciation Day! 🥳

We’d like to thank our volunteers who help us in ways big and small: Educating visitors, manning the touch tank, wiping sticky fingerprints off the tanks, and scooping p**p! 🤓 🦐 🧹 💩 It all needs to be done, and we’re grateful you do it so well.

📷: Ariel Plotnick

Photos from The Tropical Lagoon Aquarium's post

Photos from The Tropical Lagoon Aquarium's post
MIT researchers work on repelling the bane of tropical-fish enthusiasts: Algae growing on the glass of their aquariums, but with the goal of reducing carbon emissions

MIT News reports researchers may have figured out how to keep algae from growing on glass surfaces: Coat the glass with "a material that can hold an electrostatic charge, and then applying a very small voltage to that layer," which in turn repels the algae, which have a negative charge on their cell...
United States Ornamental Fish Market is expected to surpass US$ 3.67 Billion at a CAGR of 9% by 2033 | Expert data analysis by Future Market Insights, Inc.

NEWARK, DE / ACCESSWIRE / April 4, 2023 / The United States ornamental fish market is expected to reach US$ 3.67 billion by 2033, with a valuation of US$ 1.55 billion in 2023. Throughout the foreseeable period, the market has secured a CAGR of 9.0%. Why is the Popularity of Ornamental Fish Surging?....


🦀 Did you know that horseshoe crabs shed or "molt" their shells in order to grow bigger? Each horseshoe crab molts about 16 to 17 times before it reaches maturity. If you find a horseshoe crab shell on the beach, you can tell it's a molt and not a dead animal if it's light and there is an open slit at the front. The slit is where the horseshoe crab exited from its old shell.

Come visit the aquarium to see horseshoe crab molts of all sizes—from tiny pale yearlings to large adult females. Yup, females are bigger, by about 1/3! 💪🏼

📷: Molly Feltner


Great visualization of what happens to light in the water

Benjamin G Hadfield Nikki Hadfield Teton Peaks Auto & RV


4401 Sideburn Road
Fairfax, VA

Opening Hours

1pm - 4:30pm


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Our Story

The Potomac Valley Aquarium Society was founded in 1960 for the purpose of furthering the aquarium hobby by the dissemination of information and advice, and the promotion of good fellowship among the members by organized activities and competitions.

Our club meets every month the first Saturday of the month except for the Spring and Fall All-Day Auctions which fall on Sunday. Sometimes the dates, like the July Bowl Show, are pushed to avoid a holiday so always check the Program.

Meetings are free and open to the public. People who attend more than one or two meetings per year are asked to join the club. The annual membership fee for individuals is only $20/year and helps us pay for the meeting room.

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THANK YOU PVAS for your hospitality and friendliness over the weekend, and for the opportunity to present at your legendary club! So looking forward to seeing you all again at CatCon this Autumn! - Ted Coletti
See web site for all details. Hope you can join us.
Hi, PVAS! Looking forward to my trip down to Fairfax to speak at your renown club!

- I am donating a signed copy of my book for your door prize, and some bagged tub pond plants for your auction.

- I will bring a limited number of copies of my book for purchase (cash only) and happy to sign any. You can also purchase in advance on Amazon below.

- any recs on aquarium shops along the way from Bucks County, PA? I will be traveling mostly I-95 then I-495.

Your hospitality has been most commendable and looking forward to meeting as many of you as I can!

Dr. Ted

Anyone looking to rehome some oscars or plecos? I have some for free rehoming as well.
Check out this crazy aquarium someone is selling! Idk if I'd trust that.
Can someone tell me the date for the October Fish Tailgate please?
2021 Keystone Clash convention and aquarium fish show event. Held on September 24-26 2021 at the Morgantown PA Holiday Inn.

For those new to the event, this is an annual event that happens each fall, roughly in the south east portion of Pennsylvania. Aquarium fish keepers, hobbyists, presenters, and vendors all congregate on this event weekend in order to celebrate aquarium keeping, excellence in husbandry, and of course the fish themselves!

Viewing of the fish show, vendor area, and live fish auction is open to the public for free. (We are not responsible for how much you spend in the auction though)

Paid registrants to this event get access to even more goodies. A whole host of renowned aquarium hobby speakers will be brought in for the event and registrants will be able to attend a multitude of presentations of varied topics within the aquarium hobby. You must also register in order to enter fish (Fish show entries are now closed. No walk-in entries allowed) into the competition itself and participate in the many raffles (thank you to our sponsors!!!) and to enter your children into the "Give A Kid A Tank" contest. Some sponsor donations are saved for your registrant goodie bags as well 🙂
More perks may be announced as well, join the Keystone Clash Facebook Group and follow the Keystone Clash page in order to get the latest and greatest Clash event updates - including speaker announcements

Be sure to register properly through the website when registration opens for this event. Some items, such as limited edition Keystone Clash t-shirts and merchandise may run out if we get too many last-minute registrations. All aquariums are pre-set up prior to the event, so there will be no space for fish-entry walk-ins. Pre-register of fsh is closed now.

Re:Covid and will announce any changes to the event if they occur. Safety will be our top priority, so please be prepared to comply with any local Covid safety mandates such as face masks or occupancy restrictions.
Register now at
Moving and rehoming a 120g planted Walstad aquarium. Seeking experienced aquarist and preferably someone with RO as that is what the system is used to. Hand raised these angels and love them dearly. Currently located in Falls Church. Send me a message!
CCA Club May Meeting is here!!!

Link to join in will be open at 1:40pm for all CCA paid and non paying members.

Topic: CCA May 8, 2021 - Zoom Invite:

Topic: " Small and unusual freshwater fish: How to care for and succeed with delicate and specialized animals in aquaria"
Time: May 8, 2021 2:00 PM Eastern Time (US and Canada)

Speaker's Bio: Heather Burke is a 28-year-old aquarist from Charlotte, Michigan. She has kept and bred fish for most of her young life and harbors a keen interest and passion for the aquarium hobby. She has been active in aquarium societies since the age of 14 and has witnessed some 50 spawns of freshwater fish and invertebrates spanning two clubs. Her interests in fish are broad and range from nano species of cyprinids to wild-type livebearing fishes and dwarf cichlids. She obtained a degree in Fisheries and Wildlife at Michigan State University in May of 2016. She has previously been employed with Preuss Pets in Lansing and worked for the University of Michigan as a fishroom tech for a zebra danio lab. Heather currently works in the budding aquatics department at Josh's Frogs, an online pet retailer.

Join Zoom Meeting

Meeting ID: 993 0099 5685
Passcode: 405783
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