When shopping at the market, it's easy to be tempted by the sight of fresh fish at bargain prices. However, not all fish are created equal, and some might be better left on the shelf. While freshness and price are key factors in making a purchase, there are certain types of fish you should avoid, even if they seem like a great deal. Here are five types of fish that, despite their appearance, should not be bought at the market, no matter how fresh and cheap they seem.

1. Imported Tilapia

Tilapia is one of the most commonly available fish worldwide and often comes at a very low price. However, most of the tilapia sold in markets is imported, particularly from countries with questionable farming practices. These fish are often raised in overcrowded, unsanitary conditions, which can lead to contamination and health risks. Moreover, tilapia farmed in certain regions may be treated with harmful chemicals and antibiotics that can affect your health. While it may appear fresh and affordable, it's better to avoid tilapia in favor of more sustainably farmed or wild-caught options.

2. Farmed Salmon

While salmon is known for its rich omega-3 fatty acids, farmed salmon often falls short in terms of both nutrition and environmental sustainability. In many cases, farmed salmon are raised in cramped conditions where they are fed a diet of processed food, which alters their natural nutrient profile. Additionally, the conditions in which they are farmed can lead to the use of antibiotics and chemicals. When shopping for salmon, it’s best to look for wild-caught varieties, which tend to have a better nutrient profile and less environmental impact.

3. Bluefin Tuna

Bluefin tuna is known for its delicious taste and is often used in sushi and sashimi. However, this fish is considered endangered due to overfishing and unsustainable harvesting practices. The demand for bluefin tuna has led to significant declines in its population, making it a poor choice for both ecological and ethical reasons. If you find bluefin tuna at a low price, it is likely that it was caught irresponsibly. To protect marine ecosystems, opt for sustainably caught tuna, such as albacore or skipjack, instead.

4. Red Snapper (Imported)

Red snapper is a popular fish in many cuisines, but the imported variety should be approached with caution. Much of the red snapper sold in markets is mislabeled or comes from questionable sources where the fish are caught unsustainably. Moreover, the fish may be falsely marketed as wild-caught, when in fact it could be farmed under less-than-ideal conditions. If you come across red snapper that seems too cheap to be true, it might not be a wise purchase. Look for sustainably sourced snapper or choose other white fish options instead.

5. Mackerel (Atlantic)

Mackerel is often marketed as a healthy choice due to its high omega-3 content, but Atlantic mackerel is a species that has been heavily overfished. Overfishing threatens the population of Atlantic mackerel and disrupts the marine food chain. While it may be available for a low price, buying Atlantic mackerel contributes to the depletion of this important species. If you're craving mackerel, opt for other varieties like Pacific mackerel, which are more sustainably managed.

Why You Should Avoid These Fish

The decision to avoid certain types of fish isn't just about taste or convenience—it’s about making responsible choices for both your health and the environment. Unsustainable fishing practices, unethical farming conditions, and overfishing contribute to the depletion of marine life and the destruction of delicate ocean ecosystems. By choosing responsibly sourced fish, you're making a positive impact on both your health and the planet.

What to Buy Instead

Fortunately, there are plenty of healthy, sustainable fish choices available at your local market. Look for wild-caught fish that are labeled with sustainability certifications like MSC (Marine Stewardship Council) or ASC (Aquaculture Stewardship Council). Fish such as wild-caught Alaskan salmon, sardines, trout, and sustainable varieties of cod and haddock are all great options that offer excellent nutritional benefits without the environmental consequences.