Anchovy

Anchovies are small, oily fish belonging to the family Engraulidae. They are vital components of marine ecosystems worldwide. Most of the more than 140 known species live in saltwater environments. However, several species inhabit brackish water, which is a mix of fresh and salt water. Some species in South America are even restricted to freshwater. These fish are found in the Atlantic, Indian, and Pacific Oceans. They also inhabit the Mediterranean and Black Seas.

To survive, anchovies use a specialized method called filter-feeding. They swim through the water with their mouths open to capture nutrients. As water flows into the mouth and passes through the gills, food is caught. Small structures called gill rakers act like a sieve to trap food particles. Once trapped, these particles are transferred into the esophagus, or the throat. This process allows them to consume tiny plankton and recently hatched fish.

Anchovies have distinct physical traits that help them navigate their environments. They are typically small, green fish with silver longitudinal stripes. These stripes create blue reflections that run from the tail fin. Their snouts are blunt and contain tiny, sharp teeth in both jaws. A unique feature is the rostral organ located in the snout. Scientists believe this organ is electro-sensory, though its exact purpose remains unknown. Their mouths are notably larger than those of similar fish like herrings.

The evolutionary history of anchovies includes fascinating prehistoric relatives. During the early and middle Eocene, large predatory stem-anchovies lived in the Tethys Ocean. These ancestors, such as the genera Clupeopsis and Monosmilus, were found in Belgium and Pakistan. Because they possessed large fangs, they are often called "saber-toothed anchovies." The earliest true anchovy fossil, the stem-engrauline Eoengraulis, was found in Monte Bolca, Italy. Interestingly, anchovies are rare in the fossil record. This is likely because they live in turbid, nearshore waters where preservation is difficult.

Different species play unique roles in global fisheries and regional economies. The European anchovy is highly abundant in the Mediterranean and Black Seas. In Turkey, commercial fishing fleets catch approximately 300,000 tons of these fish annually. The Peruvian anchoveta fishery is one of the largest in the world. However, this fishery suffered a catastrophic collapse in 1972. This event was caused by the combined effects of overfishing and El Niño. It took two decades for the population to fully recover.

Anchovies serve as a critical food source for many larger animals. They are a primary prey item for many predatory fish. This includes species such as the California halibut, sharks, and coho salmon. They are also essential for marine mammals and various bird species. For example, the breeding success of the California brown pelican depends on anchovy abundance. Even humans rely on them for food and industry. They are used as bait for large fish like tuna and sea bass.

Humanity has used anchovies for thousands of years in many different ways. In Roman times, they were the base for a fermented sauce called garum. This sauce had a long shelf life, allowing for long-distance commerce. Today, anchovies are often processed through curing with salt and brine. This process creates a strong flavor and turns the flesh deep grey. They are also used in many modern condiments. You can find anchovy flavors in Caesar salad dressing and Worcestershire sauce. In Southeast Asia, they are often deep-fried as a snack.