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.
For the most part, though, any of the fish called a sardine will be a small fish, averaging 12 to 20 cm (4 1/2 to 7 1/2 inches), and can be used interchangeably (pace pilchard fans.) They will all be small, silvery fish that live in schools, and all have oily flesh.inned sardines are sold packed in either olive oil, vegetable oil, or a mustard sauce or a ketchup sauce. Fresh sardines are very popular in Spanish cooking and taste very different to the canned ones.