1. Open Water Fish

2. BARRACUDA

3. The barracuda is a ray-finned fish known for its large size (up to 6 ft in length for some species) and scary appearance

4. The lower jaw of the large mouth juts out beyond the upper

5. They are voracious predators and hunt using a classic example of lie-in-wait or ambush. They rely on surprise and short bursts of speed (up to 27mph (43 km/h) to overrun their prey

6. Like sharks, barracudas have long had a bad reputation as being dangerous to humans

7. TUNA

8. Tunas are fast swimmers, they have been clocked at 70 km/h (45 mph)

9. Bluefin Tuna

10. Thanks to 4 decades of overfishing, the bluefin tuna has been driven to just 3% of its 1960 population levels
A single bluefin sold for $172,400 at the first auction of 2001 at Tokyo's Tsukiji Fish Market

11. Yellowfin Tuna

12. Yellowfins tend to school with fishes of the same size, including other species of tuna, and larger fish are often seen with dolphins, porpoises, whales and whale sharks

13. BLUE MARLIN

14. Females, which are significantly larger than males, can reach 14 feet in length and weigh more than 1,985 pounds

15. Blue marlins prefer the higher temperature of surface waters, feeding on mackerel and tuna, but will also dive deep to eat squid

16. MACKEREL

17. Mackerel travel in schools that often contain thousands of fish
Mackerel travel in schools that often contain thousands of fish.  The swift swimming mackerel has a streamlined body and swims at high speeds for extended periods of time searching for food

18. scientists believe that conformity of body size within a specific school is necessary to allow all fish to maintain identical swimming speeds