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What do they look like?
Sardines are small, silvery fish that are known to be good to eat by many human cultures (and other fish). These fish can range in size from half-an-inch to three-feet in length, but generally sardines are four-to-six inches long. Their colorings range from blues to silvers to greens, and they are quite scaly. They're easy to spot in the water, as they generally take on a metallic hue. These fish look much like herring, longer than they are wide, but they are known to swim in tropical freshwater.

How do they behave?
These fish swim in large schools. We're not talking a few dozen fish per school here, either. Sardines like to be with a few hundred of their closest friends when they travel and hang out. Their main purpose is to be eaten by other fish or caught by anglers. Sardines are some of the lowest fish on the food chain.

What else should you know about sardines?
Sardines spawn usually several times a year. They generally spawn in certain areas over and over again. Female sardines lay up to 200,000 eggs each season near the water's surface. The eggs are generally minuscule, with lengths of perhaps one millimeter. Once they're hatched, these fish generally live near plankton until they are at least an inch long, when they develop their fins and are able to swim. That's when they join forces with a couple hundred thousand of their closest friends, with whom they eat plankton and wait to be eaten themselves.