Daniel B.
Yelp
You can find some of the biggest oysters in Atlanta here at Mariscos El Veneno.
This is a Mexican seafood restaurant that has been on Buford Highway for many years. Since it's next door to the popular El Taco Veloz, it's easily overlooked. The restaurant looks like a small dump from the outside, but inside, it's actually a spacious venue. There are multiple dining areas, decorated with plants, big screen TVs to watch soccer (futbol), fish tanks, and live music. Inside and out, the place is painted in bright aqua blue colors. There's a casual and laid back yet festive atmosphere. The space works well with big groups and families or those who just want to relax, unwind, and watch a soccer match. This is an authentic Mexican eatery with a predominately Hispanic clientele.
Mariscos El Veneno is a direct competitor to another Atlanta area Mexican seafood restaurant: Mariscos La Riviera Nayarit. While Nayarit is newer and nicer, I think Veneno has the edge when it comes to food and service. Both Veneno and Nayarit serve Nayarit cuisine, named after the 200-mile stretch of coast in western Mexico. Veneno has two other locations, both in Chicago.
Fish, shrimp, crab, lobster, crawfish, oysters, mussels, clams, scallops, octopus... If you like seafood, you've come to the right place because Veneno seems to have just about everything. Dishes include ceviche, cocktails, baked oysters, raw oysters, seafood salads, seafood soups, and various platters and entrees. The menu is written in both Spanish and English, but best of all, there are helpful, accurate pictures of every dish so you know what to expect.
For seafood, I think the prices are fair. Expect to spend about $15-20 each for most entrees, more if you plan on ordering one of the crab, lobster, or shareable platters ($25+). Portion sizes are ginormous.
I'm allergic to shrimp (and other crustaceans) and there seems to be shrimp on a majority of the dishes. Fortunately, the kitchen can accommodate allergies and shrimp has been removed from the dishes I've ordered. That is nice of them.
A basket of fried corn tortillas and crackers, a plate of lime wedges, and a serving of the restaurant's housemade habanero salsa is complimentary and served at every table. The habanero salsa includes minced onions and is spicy. Each customer also gets a free ceviche-topped tortilla. It's delicious. I believe fish is the only seafood used in the ceviche which also includes chopped cucumber, tomato, carrots, and onion. It's nicely cured with a good sour flavor.
In general, the food and ingredients are fresh. A dozen oysters are $14.50 (half $9.50). The oysters are huge. They're the biggest I've had in Atlanta to date. The only place I've had bigger oysters is in New Orleans. It's like they're on steroids. Photo: http://www.yelp.com/biz_photos/mariscos-el-veneno-atlanta?select=ok6B6siB5G2QbFyj0zpv7Q#ok6B6siB5G2QbFyj0zpv7Q.
Raw oysters are served on the half-shell on ice with a bunch of lime wedges. There's no cocktail sauce nor mignonette sauce. There are, however, five different hot sauces at the table plus ketchup and salsa, though I'd much rather have cocktail and mignonette sauces over those. The oysters themselves are plump and succulent, though they could stand to have more flavor and brininess.
If you like fish, try the Huachinango estilo Nayarit ($17.99). I've had this dish at other Mexican restaurants around town and find Veneno's version to be one of the better ones. It consists of a whole fried fish (tilapia, I believe) served with sides of salad with sliced cucumber, tomato, carrots, and red onion, sliced orange, rice with chopped veggies, a buttered roll, and French fries. It's a lot of food. The fish is savory, served charred and crispy. The meat, served bone-in, has been pre-cut into sections.
Another fish dish I've tried is the Salmon a la Parrilla ($17.99). This dish comes with the same sides as the Huachinango above (salad, orange, rice, roll, fries) plus three salmon fillets. The boneless strips of salmon have been chargrilled. I think the salmon is sufficiently fresh and is OK quality, though it could be seasoned better. There's just not a whole lot of flavor and therefore, I do not recommend unless you're going the healthy route. The sides are pretty generic and straightforward.
Due to the large plates and massive portion sizes, many entrees have a nice wow factor to them. This includes the Pina Rellena ($16.99) which is half a pineapple stuffed with seafood and topped with melted cheese and the "7 Seas" soup which comes with a variety of seafood. Photo of the latter: http://www.yelp.com/biz_photos/mariscos-el-veneno-atlanta?select=ubZxlx-HD4H1BoLwsYk55w#ubZxlx-HD4H1BoLwsYk55w.
Service is very good. If you have leftovers, the servers will package and bag them in sealed foil trays. The staff primarily speaks Spanish. Nayeli, who handles the register and takes phone calls, is fluent in English and is helpful.
Parking is located in the front and rear.