Venomous Fish Along the Costa Blanca Coast: What You Need to Know This Summer

From your trusted team at SICLINICS

As summer arrives and beach season is in full swing, the Costa Blanca coastline welcomes thousands of sunseekers and swimmers. While the sea offers relaxation and fun, it’s important to stay aware of certain hidden dangers—particularly the spider fish, also known as the greater weever (Trachinus draco), a venomous species found in shallow waters along this region.

What Is the Spider Fish?

The spider fish is a bottom-dwelling marine species with sharp, venomous spines located on its dorsal fin and gill covers. It often buries itself in sandy sea beds near the shore, making it easy for unsuspecting swimmers to accidentally step on it.

Though not aggressive, a sting from this fish can be extremely painful and requires immediate attention.

Symptoms of a Sting

If stung, you may experience:

• Sudden, intense burning pain at the site
• Swelling, redness, and numbness
• In some cases: nausea, dizziness, or mild fever

The pain can be severe and typically begins immediately after contact.

First Aid: What to Do

If you or someone near you is stung by a spider fish:

1. Rinse the wound with clean, fresh water to remove any sand or debris.

2. Immerse the affected area in hot water (between 40–45 °C / 104–113 °F) for 30 to 90 minutes. Heat helps to break down the venom and relieve pain.

3. Do not apply cold compresses – this can worsen symptoms.

When to Seek Medical Attention

• You should see a doctor immediately if:
• The pain remains intense or worsens
• You experience allergic reactions such as difficulty breathing or swelling beyond the sting area
• The sting is located near sensitive areas like the face, eyes, or genitals

How to Avoid Spider Fish Stings

• Wear water shoes when entering the sea, especially on sandy seabeds
• Avoid walking barefoot in shallow, sandy waters
• Never touch or handle unfamiliar fish or marine animals

We’re Here to Help

At SICLINICS, your health and safety are our top priority—all year round. Our medical team is available throughout the summer to provide expert care and advice for any marine-related injuries or concerns.

If you’ve been stung or have any symptoms that worry you, don’t hesitate to contact us or visit the clinic for prompt and professional treatment.

Enjoy the sea safely—and remember, prevention is the best protection.