Contents. 1  Inflammatory joint effusion AND Stiff hip: Causes of All Symptoms. 2  Inflammatory joint effusion OR Stiff hip: Causes of Any Symptom. 3  Inflammatory joint effusion: Causes. 4  Inflammatory joint effusion: Introduction. 5  Stiff hip: Causes. 6  Stiff hip: Introduction.
Sardines are an important part of the food chain. Jupiterimages/Photos.com/Getty Images. Sardines live in large schools that may contain thousands of fish. They typically feed on plankton and are close to the bottom of the food chain; many different kinds of predators eat sardines, including humans.
1 Sardines -- a type of small fish in the herring family -- are rich in calcium and other minerals, vitamin D, and omega-3 fatty acids.2  Sardines are often found close to the ocean's surface. 3  Sardines are a popular catch for the fishing industry. 4  Sardines are often canned in oil.he sardine is a small, silvery fish with a protruding snout and large mouth. Sardine species can be found in northern and southern waters, and favor estuaries or inter-tidal zones.