Stay out of shark-infested waters. The best way to avoid shark attacks is to stay out of water where sharks live. This of course means staying out of the ocean, but it also means staying out of estuaries and coastal rivers and lakes. The dangerous bull shark, in particular, can tolerate fresh water, and these large sharks are known to travel up rivers far inland. In fact, they have been spotted 2,500 miles (4,000 km) up the Amazon and as far up the Mississippi River as Illinois. If you can't avoid getting in the water altogether, at least try to avoid danger zones. Heed warnings. Coastal areas where sharks have recently been sighted will often have posted warnings, and even in the absence of these, local people may be able to alert you to potential dangers. Stay out of the water if warned to do so.Prevent a Shark Attack Step 1Bullet1.jpg Avoid steep drop-offs and the areas between sandbars. These are among sharks' favorite haunts.Prevent a Shark Attack Step 1Bullet2.jpg Avoid waters contaminated with effluents or sewage. Sharks are drawn to these areas. Of course, that's not the only reason to avoid polluted water.Prevent a Shark Attack Step 1Bullet3.jpg Avoid swimming near fishing activity. Sharks may come in for a snack off fishermen nets or lines, and they may be attracted by bait or by discarded fish. Even in the absence of fishing boats, if you see seabirds swooping down to the water, there's a good chance there's fishing activity or feeding going on.Prevent a Shark Attack Step 1Bullet4.jpg
Know your shark. There are more than 300 species of sharks, but very few of these are considered dangerous to humans. In fact, three species--the white, tiger, and bull sharks--are responsible for the vast majority of human fatalities. These sharks are widely distributed in coastal waters throughout the world, and if you see them or know they are present you should exit the water as soon as safely possible. The oceanic white-tip shark is more common in the open ocean and can also be aggressive. Find out what kinds of sharks may be present where you will be entering the water, but keep in mind that any shark over 6 feet (1.8 m) in length should be considered potentially dangerous.
Carry a weapon. If you're diving in waters where you're likely to encounter sharks, carry a spear-gun or pole-spear. By no means should you provoke an attack or lull yourself into a false sense of security with these weapons, but if you are attacked they may save your life.
Dress appropriately. Stick to dull swimwear and wetsuits, as bright or flashy colors with high contrast can attract sharks. Avoid wearing jewelry, as the reflection of light off such accessories is similar to the reflection of light off a fish's scales, and it can thus make you look like food. Cover your diving watch with the cuff of your wetsuit. Similarly, avoid or cover uneven tanning, as the contrast makes you more visible to shark. The bright yellows and oranges typical of life jackets and flotation devices can be attractive to sharks, but if you're in the open ocean you need to consider that these colors also make you more visible to rescuers.
Be vigilant. You may encounter any number of hazards when diving, surfing, or swimming in the ocean or coastal rivers, and you should always be wary. Proceed with caution in whatever you do, and be aware of your environment. If you spot a shark, don't let it out of your sight until you're safely on shore or in the boat.
Move gracefully. Avoid splashing on the surface of the water, and try to swim smoothly at all times. Avoid sudden or erratic movements when in the presence of sharks, as these may draw attention to you and, worse yet, give you the appearance of being wounded. If you see a shark nearby while you're diving, stay as still as possible to avoid attracting its attention or threatening it.
Swim in a group. Regardless of the danger of sharks, you should avoid swimming alone. If sharks are present, however, it's even more important to travel with a buddy or a group. Sharks are less likely to approach and attack a group of people, and if one member of the group is attacked, help is immediately available. When diving in the presence of sharks, one member of the group should be charged solely with watching the sharks and detecting changes in their behavior.
Recognize aggressive behavior. Sharks swimming slowly and smoothly are generally not a threat. They may approach divers but are generally just curious when they do so. If a shark begins making sudden movements, swimming quickly or erratically, or if it shows signs of aggression or irritation--pointing its pectoral fins down, arching its back, pointing its head upward, zig-zagging, or charging--it may be considering an attack. Swim quickly and smoothly to safety, either out of the water or to a defensible location, and prepare to defend yourself.
Stay out of the water at night and during dawn and dusk. Sharks hunt most actively at these times, and they're harder for you to see in dark conditions. Also in shark-prone areas try to avoid overcast days, as it approximates the light levels at dawn and dusk's feeding times.
Stay out of the water if bleeding. If you have an open wound. Women need not be concerned if they are experiencing menstrual bleeding. Tampons remedy this, and without one the amount of blood released in a 30-45 minute dive would be exceptionally minuscule.
Avoid provoking sharks. A little less than half of documented shark attacks result from provocation or harassment of sharks, particularly by divers. Use common sense, and give sharks plenty of space. Do not attempt to catch or prod sharks. Don't corner them, and don't try to get close to them to photograph them. But, if you have to get close, be sure to carry a weapon.
Don't urinate in the water.
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