Eric J. Hilton curates the Nunnally Ichthyology Collection at the Virginia Institute of Marine Science. It has become the only institution to actively maintain a collection of Chesapeake Bay and mid-Atlantic fish. (Photos by Steve Droter)

When the start of a new school year drives students into the library, it’s not always a given that they are looking at books. In fact, one marine research center in Virginia is home to a library filled with fish.

The Nunnally Ichthyology Collection at the Virginia Institute of Marine Science (VIMS) contains more than 100,000 freshwater, estuarine and marine fish specimens for use in research and education. The collection is curated by Eric J. Hilton, an associate professor of marine science who has spent a great deal of his life around collections of fish and reptiles. But this one, he says, is unique: after taking on “orphaned” specimens from two other laboratories, VIMS has become the only institution to actively maintain a collection of Chesapeake Bay and mid-Atlantic fish.

A small preserved seahorse floats in a jar

A lined seahorse (Hippocampus erectus) specimen is one of the native species preserved at VIMS.

Man stands between rows of jars on shelves

VIMS has become the only institution to actively maintain a collection of Chesapeake Bay and mid-Atlantic fish.

The preservation process starts with the euthanization of the fish. Then, the specimen is soaked in a formalin bath to prevent tissue decay and breakdown.

A tray of fluid holds several preserved fish

A specimen undergoes initial preservation in a 10% Formalin solution.

A glass jar shows orange fluid and preserved fish

Jars of preserved striped bass (Morone saxatilis) caught on the Rappahannock River in Virginia.

Once the specimen is completely soaked (larger fish take quite a bit more time to preserve than smaller fish), the formalin is flushed from the body and the specimen is placed in a jar that contains a 70 percent ethanol solution.

Oftentimes, multiple specimens of a single species are collected and catalogued. Because there is always variation in nature, researchers prefer to compare and contrast multiple fish of the same species to gain a well-rounded perspective of what the fish and the area they live in are like. “Looking at [only] one individual from a [single] locality will not give you a good view of that locality,” Hilton said.

Each jar is given its own catalogue number that will follow the specimen far into the future. “With that [catalogue] number comes species identification, and all of the attributes of when and where that fish was caught and how it was caught,” Hilton said. “[The number] is entered into a catalogue that is accessible to people throughout the world.”

A man holds shark jawbones with several more resting on a table

Hilton holds the jawbones of a shark.

Two fish skeletons are held in two hands

The bones of an invasive northern snakehead, left, prove similar to those of a native bowfin.

VIMS also collects a limited amount of skeletal remains in order to conduct skeletal analyses of certain species. “We hope that someday, people can come to the Chesapeake Bay and ask, ‘What was here in 2013?’ and get to see those species and specimens,” Hilton said. If the collection is properly cared for, its fish could be kept for well over 200 years. In fact, some natural resource libraries in Europe are more than 400 years old.

A tiny flat fish is held in a man's fingers

A juvenile non-native southern flounder (Paralichthys lethostigma), caught in the Virginia portion of the Chesapeake Bay.

Because its specimens have been collected over decades, the library contains evidence of changes in the Bay. The southern flounder, for instance, is typically found off the coast of North Carolina and other southern waters. Historically, adult southern flounders have made their way to the southernmost portions of the Bay only during hot summer months when the water is warm. But in recent years, researchers have found young southern flounder in the Bay and have added them to the VIMS collection. This new addition indicates a northward shift of southern flounder spawning grounds, likely due to warming waters and climate change.

A long fish is held with two hands

A northern snakehead specimen, caught in the Chesapeake Bay.

The fish collection also stores vital information about the introduction and spread of invasive species like the northern snakehead or blue catfish across the state of Virginia and the Bay watershed. Hilton explains: “We have snakeheads from different drainages, so we can track their invasion. We have some of the first juvenile blue cats, and can get a sense of where and when the invasions start.”

A light-colored primitive fish on a table

An Atlantic sturgeon specimen.

Despite the recent addition of new species, the collection’s primary purpose is to track fish that are native to the Bay, like the Atlantic sturgeon or the lined seahorse.

Bearded man holds a fish in a jar

Hilton holds a preserved American shad (Alosa sapidissima).

VIMS plans to continue their fish collection efforts for the foreseeable future. After all, as science and technology advance, researchers can conduct new tests on older specimens and learn things about the species or its environment that they might not have known before. “If you stop collecting, you limit what you are able to do,” Hilton said.

To view more photos, visit the Chesapeake Bay Program Flickr page.

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