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Posts tagged: fish

Cold Water Can be Used as a Climate Shield to Protect Native Aquatic Species

Maps showing the study area and locations of stream temperature data that were contributed by hundreds of people working for more than 80 natural resource agencies to develop high-resolution stream temperature scenarios that encompass 450,000 kilometers of stream. (Courtesy of U.S. Forest Service Rocky Mountain Research Station)

Maps showing the study area and locations of stream temperature data that were contributed by hundreds of people working for more than 80 natural resource agencies to develop high-resolution stream temperature scenarios that encompass 450,000 kilometers of stream. (Courtesy of U.S. Forest Service Rocky Mountain Research Station)

Climate change and species invasions raise fears that iconic cold-water species like trout, salmon, and char could be extirpated from most of their ranges this century.

A new study by researchers at the U.S. Forest Service Rocky Mountain Research Station published in Global Change Biology shows that high-resolution stream temperature scenarios can be used to forecast which streams will serve as climate refuges for native cutthroat and bull trout later this century and that many streams are forecast to be too cold to be invaded by non-native species. Read more »

When Exotic Fish are Away, Hawaiian Waterbirds Will Stay

Invertebrates are an important food source for native waterbirds, including endangered ae‘o (Hawaiian Stilt, Himantopus mexicanus knudseni) chicks. (U.S. Forest Service/Rich MacKenzie)

Invertebrates are an important food source for native waterbirds, including endangered ae‘o (Hawaiian Stilt, Himantopus mexicanus knudseni) chicks. (U.S. Forest Service/Rich MacKenzie)

Coastal wetlands the world over are known for harboring an impressive array of plants and animals. In the Pacific Islands, wetlands not only provide habitat for many unique species, including some threatened and endangered waterbirds, but also support communities of people who rely on these special places for food and other essentials.

Human development, agriculture, and rising seas are encroaching upon these wetland ecosystems and causing visible and profound changes. Another threat, less obvious to the casual observer, lurks beneath the water’s surface: non-native fish. Researchers with the U.S. Forest Service Pacific Southwest Research Station’s Institute of Pacific Islands Forestry are studying the threats posed by exotic fish species and working with partners to battle the gilled invaders. Read more »

Students Get Schooled by Schools of Fish

USDA Under Secretary Cathie Woteki reviews the hydroponic garden at Food and Finance High School in New York City, which is fed nutrients from sediment collected in Dr. Warner’s basement fish tanks and pumped up four floors to the garden.

USDA Under Secretary Cathie Woteki reviews the hydroponic garden at Food and Finance High School in New York City, which is fed nutrients from sediment collected in Dr. Warner’s basement fish tanks and pumped up four floors to the garden.

This post is part of the Science Tuesday feature series on the USDA blog. Check back each week as we showcase stories and news from USDA’s rich science and research portfolio.

Schools of fish may be common things to see, but watching some fish school high school students from a basement in Manhattan’s West Side is a different experience altogether. Cathie Woteki, USDA’s Chief Scientist and Under Secretary for Research, Education and Economics, observed such a program recently during a visit to Food and Finance High School in New York.

There on West 50th Street, Cornell University operates laboratories that represent the latest in scientific technology to raise fresh, clean fish in addition to garden produce in a sustainable urban setting. Renowned Cornell scientist and educator Philson Warner developed a system for continuously re-circulating and reconditioning water to raise more than 10,000 tilapia and other fish at a time in the basement lab. The nutrient-rich water from the fish is then transferred to a hydroponic garden located a few floors up on campus. That garden produces nine types of lettuce, Chinese cabbage such as bok choi, and a variety of herbs that include sweet basil, oregano, thyme and parsley. The plants then clean the water, which is sent back to the fish. Read more »

Kids Visit Mom’s Co-Workers: Smokey Bear and Woodsy Owl

Olivia and Lily Anderson enjoy making camp at Betty Brinn Children’s Museum. Lily (right) builds the fire as Olivia (left) preps the dinner. (Photo courtesy Leah Anderson)

Olivia and Lily Anderson enjoy making camp at Betty Brinn Children’s Museum. Lily (right) builds the fire as Olivia (left) preps the dinner. (Photo courtesy Leah Anderson)

As a U.S. Forest Service employee, I was very excited recently to take my two preschool age daughters to visit my co-workers: Smokey Bear and Woodsy Owl.

The visit, however, took us to the Betty Brinn Museum’s Home Sweet Home Exhibit located in Milwaukee, Wis.

Created in collaboration with the Forest Service, the exhibit shares Smokey’s message of “Help Prevent Forest Fires” and Woodsy’s message of “Give a Hoot Don’t Pollute,” in addition to fun activities underscoring the importance of protecting ecosystems. Read more »

Scientists Discover New Fish Species in the Upper Columbia River Basin

Cedar sculpin (Cottus schitsuumsh). (Emily Harrington/E.H. Illustration)

Cedar sculpin (Cottus schitsuumsh). (Emily Harrington/E.H. Illustration)

U.S. Forest Service scientists at the Rocky Mountain Research Station in Missoula, Mont., have identified a new species of fish—the cedar sculpin (Cottus schitsuumsh). Although thousands of new species are described by scientists each year, only a small percentage of them are animal species, and even fewer are found in the United States, underscoring the importance of this discovery.

Freshwater sculpins, with their characteristic large heads and fins, are bottom dwellers that can be found in cold, fast-moving streams throughout North America. Biologists have long suspected that there were undescribed species of sculpins in the Upper Columbia River Basin, but lacked the tools to recognize them. Cedar sculpin populations were previously thought to be shorthead sculpin (Cottus confusus), an understandable misidentification given that sculpins are notoriously difficult to identify based on their physical features. Read more »

Range of Bull Trout in Oregon’s McKenzie River Indicates Improved River Health

Bull trout spawn in a spring of the Middle Fork Willamette River. They were transferred from the McKenzie River to historic habitats in the Middle Fork. (U.S. Forest Service)

Bull trout spawn in a spring of the Middle Fork Willamette River. They were transferred from the McKenzie River to historic habitats in the Middle Fork. (U.S. Forest Service)

The bull trout in the McKenzie River on the Willamette National Forest have a survival story to tell, thanks to U.S. Forest Service stewardship of local rivers and fresh, healthy sources of groundwater.

“We’re reintroducing the top predator back into the river ecosystem,” said Ray Rivera, the district fisheries biologist on the forest’s McKenzie River Ranger District. “Their presence means two things to us. First, because bull trout are very sensitive to environmental changes compared to other salmonid fishes, their existence means the river’s water quality is excellent and the physical quality of their habitat is also good. Second, since bull trout are the top predator and they are doing well this means the overall ecosystem is doing well. Their presence is an excellent barometer of a river’s health.” Read more »