About Us

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


PVAS meetings are held at the following location in the cafeteria:

Green Acres School
4401 Sideburn Road
Fairfax, Virginia 22030

Click here for directions.


Upcoming Events

All-Aquarium Catfish Convention 2016

October 13-16, 2016
Hyatt Regency Dulles



Want to get more involved in PVAS? Serving on a club committee is a great way to meet members and have fun. Click here to read about all the committees at work today.



Click here for our full calendar of events.

Next meeting: October 1st at 1:00pm

Speaker: Mark Duffill, "Loaches"

Mark Duffill

Mark Duffill got his first fish when he was 6 years old and was 'hooked' immediately. As soon as he was old enough he became a junior member of the local fish keeping club and got the bug for showing fish and winning prizes. Mark progressed in the club as a committee member and eventually club secretary. As well as fishkeeping, Mark owns and helps out with several websites and Facebook groups, including Loach Fanatics.

This aside, he also advanced to become an A-class judge for the North East Federation of Aquarist Societies. Fish keeping took a back seat for a while due to work commitments. Unfortunately, his career as an electrician ended in 1999 when he was diagnosed with fibromyalgia and spondylosis in the spine. Since then he channelled his time, energy and passion for fish to keeping, breeding or catching and collecting.

Mark works primarily with Loaches, Rasboras and other Asian species, although he has periodically diverted his attention to other fish including African Rift Cichlids, Characins, Corydoras, Discus, Livebearers of all descriptions - and even at one point had nothing but Rainbow fishes. No matter what he has kept he was always drawn back to Loaches, Barbs, Danios and Rasboras.

In 2009, Mark became the founder of the International Loach Association, formerly the Loach Association of Great Britain. Mark has written books on loaches, had his articles published in several magazines around the world, had them translated into numerous languages, has been invited to travel to clubs within the UK, and now around the world to give presentations on Loaches.

Mark's passion for Loaches has seen him successfully spawn numerous species. For some time Loaches were considered unbreedable, but thanks to Mark and people like him, this myth has been dispelled. So far he has spawned 20+ loach species including Yasuhikotakia sidthimunki, Micronemacheilus cruciatus, Sewellia lineolata, Sewellia sp spotted, and Acanthocobitis zonalternans. Also firsts such as Botia kubotai, Botia histrionica, Botia striata, Acanthopsoides species and Yasuhikotakia splendida.


Join us for the presentation, raffles, a door-prize and our (not-so-mini) mini-auction.

© Potomac Valley Aquarium Society, Inc.

Web Design by Cristyn Keister