The document describes three types of fish species. The first group includes yellowtail, schoolmaster, and mahogany, which have triangular heads and enlarged canine teeth. They are nocturnal predators that sometimes swim during the day. The second group includes large species like goliath grouper and black grouper as well as smaller species like graysby and coney. The third group has three elongated dorsal spines and variable coloration with a black spot at the base of the dorsal fin. They are found in open areas and feed on mollusks, crabs, and urchins.

18. ** Scale goes up to 12 and is used throughout the world as an indicative of weather and to issue warnings on hurricanes and storms Beaufort Number Wind speed (mph) Description Wave Height (m) Sea Conditions 0 <1 Calm 0 Flat 1 1-3 Light air 0.1 Ripples without crests 2 3-7 Light breeze 0.2 Small wavelets. Crests not breaking 3 8-12 Gentle breeze 0.6 Large wavelets. Crests begin to break; scattered whitecaps 4 13-17 Moderate breeze 1 Small waves 5 18-24 Fresh breeze 2 Moderate (1.2 m) longer waves. Some foam and spray. 6 25-30 Strong breeze 3 Large waves with foam crests and some spray. 7 31-38 High wind 4 Sea heaps up and foam begins to be blown in streaks in wind direction.