Fish diurnal

Bay Anchovy

Anchoa mitchilli

Meet the shimmering silver engine of the Atlantic coast. The Bay Anchovy may be small, but its massive schools support entire ecosystems from the Gulf of Mexico to the shores of New England.

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Quick Identification

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Size

2 to 4 inches (5 to 10 cm) in length; typically weighs less than 0.2 ounces (5 grams).

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Colors

Translucent greenish-gray body with a prominent, shimmering silver stripe running horizontally along the side; fins are generally clear to slightly yellowish.

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Key Features

Large mouth extending well past the back of the eye
Distinctive silvery longitudinal stripe on the flank
Translucent, slender body
Deeply forked caudal (tail) fin

When You’ll See Them

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Activity pattern diurnal

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Peak hours Dawn and dusk for feeding; movement is heavily influenced by tidal cycles.

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Season Year-round, with peak abundance in shallow coastal waters from May through October.

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Diet A filter-feeder that consumes zooplankton, primarily copepods, as well as small crustacean larvae and fish eggs.

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Habitat Coastal estuaries, bays, and lagoons; frequently found in brackish tidal rivers and shallow muddy-bottom areas.

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Behavior

Bay Anchovies are highly social schooling fish that serve as a foundational link in the Western Atlantic food web. They are often found in massive, synchronized groups that can number in the thousands or even millions. These schools move as a single unit, a defensive strategy designed to confuse larger predators like striped bass, bluefish, and various seabirds. By swimming in tight formations, they reduce the chances of any single individual being singled out.

Despite their delicate appearance, they are remarkably hardy and can tolerate a wide range of salinities, from nearly fresh water in tidal rivers to the high salt content of the open ocean. They are primary consumers, spending much of their time filter-feeding as they move through the water column. They are particularly active during tidal shifts, moving into shallow marshes with the rising tide to forage and retreating to deeper channels as the water recedes.

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Camera Tips

Capturing clear footage of Bay Anchovies requires an underwater camera setup, such as a GoPro or a specialized marine trail camera. To get the best results, mount your camera to a stationary object like a dock piling or a weighted tripod in a shallow estuary. Because these fish are translucent, they are best filmed with the sun behind the camera or using side-lighting; this helps catch the reflection of their silver lateral stripe, making them 'pop' against the murky background of the bay.

Avoid using direct front-facing LEDs if you are filming at night or in low-visibility water, as this will cause 'backscatter'—reflecting light off every speck of sediment and obscuring the fish. Instead, try to position your camera near a natural bottleneck, such as a narrow channel leading into a salt marsh or near a patch of submerged aquatic vegetation. These areas act as highways for schools during tidal changes. Setting your camera to a high frame rate (60fps or higher) is essential, as these fish move with incredible speed when startled.

If you are using an AI-powered camera with motion detection, be aware that the movement of seagrass or suspended debris might trigger false positives. For the most reliable captures, set the camera to time-lapse mode or short interval bursts during the two hours surrounding high tide. Remember that saltwater is highly corrosive; always rinse your camera housing with fresh water after retrieval and check the lens port for 'biofouling'—small barnacles or algae that can grow on the lens in as little as 48 hours in warm summer waters.

Similar Species

Species that look similar or are commonly confused with Bay Anchovy.

Striped Anchovy

Grows larger (up to 6 inches) and has a more defined, narrower silver stripe and a more pointed snout.

Atlantic Silverside

Has a much smaller mouth that does not extend past the eye and possesses two separate dorsal fins instead of one.

Frequently Asked Questions

Bay Anchovies are primarily diurnal, meaning they are active during the day. However, their movement is more closely tied to the tides than the sun; they are most active when the tide is moving, as this brings a fresh supply of plankton for them to filter-feed.

To attract Bay Anchovies, position your camera near structures like dock pilings or oyster reefs which provide natural cover. You can also look for 'surface boils' where larger fish are feeding, as this usually indicates a school of anchovies is nearby. They cannot be easily baited like other fish since they are filter-feeders.

They are planktivores, meaning they eat microscopic organisms. Their diet consists almost entirely of zooplankton, specifically copepods, which they strain from the water using their gill rakers as they swim with their mouths open.

Yes, they are incredibly common in suburban areas with access to salt or brackish water. You can find them under backyard docks, in canals, and along shoreline parks throughout the Western Atlantic and Gulf coasts.

The easiest way to tell them apart is the mouth. A Bay Anchovy has a very large mouth that extends well past its eye, giving it a 'gaping' look. Silversides have much smaller, terminal mouths and two distinct dorsal fins, whereas the Bay Anchovy has only one.

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