Fish are cold-blooded aquatic animals with backbones, gills, and fins. Most fishes are torpedo-shaped (fusiform) for efficient travel through water, but much variation occurs, from flattened and rounded, as in flounders, to vertical and angular, as in sea horses. Fishes range in size from the pygmy goby, Pandaka pygmaea, of the Philippines, which reaches only 12 mm (0.5 in) long and about 1.5 g (0.05 oz) in weight and is sexually mature at 6 mm (0.25 in), to the whale shark, Rhincodon typus, which grows to 18 m (60 ft) long and over 20 tons in weight.Fish respire through gills in the sides of their heads, allowing the fish to breath underwater. Fish return to the water surface for air at varying intervals. The electric eel fish can go for up to 10 minutes without resurfacing for air.Due to the bright colors of fish, and the fact that fish are extremely peaceful animals, many people today now keep all kinds of fish in tanks and ponds.
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