Science Current Events | Science News | Brightsurf.com
 

Researchers map fish species at risk from dams

May 10, 2012
A worldwide survey finds that all continents save Antarctica have regions where obstruction of rivers is a threat

Dams are believed to be one of the biggest threats to freshwater organisms worldwide: They disrupt normal patterns of water and sediment flow, impede migration, and alter the character of spawning and feeding grounds. A shortage of data has until now prevented a thorough global assessment of the threat dams pose to fish species, but a study described in the June issue of BioScience attempts just that.

The report, by Catherine Reidy Liermann of Umeå University, Sweden, and three coauthors, analyzed 397 ecologically distinct freshwater regions around the world and plotted the occurrence of dams greater than 15 meters high. This approach enabled the researchers to assess the amount of obstruction the dams caused. The authors then examined location data for fish species believed to be at risk of extinction because they are restricted to a specific region or because they have to migrate up rivers as part of their life cycle. This allowed the researchers to identify regions where dams pose the biggest risk to fish species. Factoring in where there has been additional habitat alteration-a known risk for many fishes-allowed the authors to further refine their list of the danger zones.

The results pointed to Murray-Darling Province (Australia), Southern Italy, the Lower and Middle Indus Basin, West Korea, the Upper Paraná (southern Brazil), the South Atlantic coast of the United States, and Mobile Bay ecoregions as having notable numbers of fish species at risk and heavy dam obstruction. Other parts of the United States in the 18 ecoregions deemed to present the greatest risks worldwide include the Great Lakes and part of the Gulf of Mexico. Much of the Danube, Iberia, and the Southern Temperate Highveld in South Africa are also on the list. These 18 ecoregions, the authors write, "merit immediate conservation attention." Eels, shads, lampreys, sturgeons, and salmonids stand out as being especially vulnerable.

The authors explain that their findings will help researchers and planners in identifying important regions where conservation is feasible because the watercourses are relatively unobstructed and are home to at-risk species. The results also flag regions where restoration-possibly even including dam removal-is desirable if fishes are to be conserved.

American Institute of Biological Sciences


Related Fish Species Current Events and Fish Species News Articles


New model predicts fish population response to dams, other ecological factors
Researchers have developed a model to assess how dams affect the viability of sea-run fish species that need to pass dams as they use both fresh and marine waters during their lifetimes.

New tool to save salmon: Isotope tracking
Salmon carry a strontium chemical signature in their "ear bones" that lets scientists identify specific streams where the fish hatched and lived before they were caught at sea.

Populated Puget Sound sees stark shifts in marine fish species
The most populated areas of Puget Sound have experienced striking shifts in marine species, with declines in herring and smelt that have long provided food for other marine life and big increases in the catch of jellyfish, which contribute far less to the food chain, according to new research that tracks species over the last 40 years.

Listening for whales and fish in the Northwest Atlantic ocean
Scientists are using a variety of buoys and autonomous underwater vehicles to record and archive sounds from marine mammals and fish species in the western North Atlantic through a new listening network known as the U.S. Northeast Passive Acoustic Sensing Network (NEPAN).

Study advances new tool in the fight against invasive species
Asian carp. Burmese python. Hemlock woolly adelgid. These are just some of the most destructive pests and the world's worst invasive species that raise the hackles of fisherman, farmers, and wildlife managers everywhere they invade.

How oil damages fish hearts: Five years of research since the Deepwater Horizon oil spill
Scientists with the Ecotoxicology Program at NOAA's Northwest Fisheries Science Center in Seattle have been working to understand those effects. "Along with our research partners," said Nat Scholz, the scientist who leads the program, "we're investigating the more subtle, lingering, and potentially widespread impacts of oil on the health and survival of fish."

Warming seas pose habitat risk for fishy favorites
Popular North Sea fish such as haddock, plaice and lemon sole could become less common on our menus because they will be constrained to preferred habitat as seas warm, according to a study published today in Nature Climate Change.

Dynamic dead zones alter fish catches in Lake Erie
New research shows that Lake Erie's dead zones are actually quite active, greatly affecting fish distributions, catch rates and the effectiveness of fishing gear.

Recipe for saving coral reefs: Add more fish
Fish are the key ingredients in a new recipe to diagnose and restore degraded coral reef ecosystems, according to scientists from the Australian Institute of Marine Science, WCS, James Cook University, and other organizations in a new study in the journal Nature.

Recovery potential for the world's coral reef fish
A simple test of the number of fish living on a coral reef can be used as a roadmap to restore degraded reefs and fishers' livelihoods according to a global study published in the journal Nature.
More Fish Species Current Events and Fish Species News Articles

Peterson Field Guide to Freshwater Fishes, Second Edition (Peterson Field Guides)

Peterson Field Guide to Freshwater Fishes, Second Edition (Peterson Field Guides)
by Lawrence M. Page (Author), Brooks M. Burr (Author), Eugene C. Beckham (Illustrator), Justin Sipiorski (Illustrator), Joseph Tomelleri (Illustrator), John P. Sherrod (Illustrator)


There are nearly 1,000 species of freshwater fishes in North America alone, and identifying them can sometimes be a daunting task. In fact, in just the twenty years since publication of the first edition of the Peterson Field Guide to Freshwater Fishes, the number of species has risen by almost 150, including 19 marine invaders and 16 newly established nonnative species. This second edition incorporates all of these new species, plus all-new maps and a collection of new and revised plates. Some of the species can be told apart only by minute differences in coloration or shape, and these beautifully illustrated plates reveal exactly how to distinguish each species. 

The guide includes detailed maps and information showing where to locate each species of fish—whether that species...

A PocketExpert Guide to Marine Fishes: 500+ Essential-To-Know Aquarium Species

A PocketExpert Guide to Marine Fishes: 500+ Essential-To-Know Aquarium Species
by Scott W. Michael (Author)


Like a field guide to marine aquarium fishes, this first PocketExpert™ Guide offers a quick but authoritative reference for identifying, buying, and keeping more than 500 popular saltwater species. Designed by a team of marine enthusiasts and aquarium professionals, this information-packed handbook covers all of the fishes most often seen by hobbyists. "One species per page" listing offers concise, clear advice and data on: scientific and common names, maximum length, range, minimum aquarium size, foods and feeding, aquarium suitability, reef aquarium compatibility, behavior, and captive care advice. Included are all 29 major families and groups of marine aquarium fishes, ranging from angelfishes, butterflyfishes, and cardinalfishes to surgeonfishes, triggerfishes, and wrasses.

Complete Guide to Fresh and Saltwater Fishing: Conventional Tackle. Fly Fishing. Spinning. Ice Fishing. Lures. Flies. Natural Baits. Knots. Filleting. Cooking. Game Fish Species. Boating

Complete Guide to Fresh and Saltwater Fishing: Conventional Tackle. Fly Fishing. Spinning. Ice Fishing. Lures. Flies. Natural Baits. Knots. Filleting. Cooking. Game Fish Species. Boating
by Vin T. Sparano (Author)


The ultimate do-it-yourself guide for the fresh- and saltwater angler. From the author of the award-winning Complete Outdoors Encyclopedia, this volume will prove to be the most complete fishing instruction book ever published. This indispensable resource offers in-depth coverage of spin, bait, and fly-fishing techniques, tackle, and species profiles of salt- and freshwater game fish. The book also features a section on filleting and cooking, with more than fifty proven recipes. With nearly 600 color photographs and illustrations, Complete Guide to Fresh and Saltwater Fishing clearly explains and illustrates the most successful techniques for any type of fishing. This book is a must-have reference guide for both novice and experienced anglers, as well as any person planning to wet a line...

Sport Fish of Fresh Water

Sport Fish of Fresh Water
by Vic Dunaway (Author), Kevin R. Brant (Illustrator)


If every freshwater angler could have just one book on fishing, this would be the one! Stunning illustrations of more than 170 species are included. More than just a guide to fish identification, inside you'll find information on where the fish live, their size range, their fighting ability and table quality. Plus you'll get tips on tackle, bait, and the techniques you'll need to hook up.

500 Freshwater Aquarium Fish: A Visual Reference to the Most Popular Species

500 Freshwater Aquarium Fish: A Visual Reference to the Most Popular Species
by Greg Jennings (Editor)


Expert advice on freshwater aquarium fish. Illustrated in full color, this comprehensive reference includes 500 of the most popular freshwater aquarium fish. It provides concise at-a-glance information on their behavior, diet and breeding, along with a recommended aquarium setup. Practical and well organized, this book is tailored to the needs of a wide range of freshwater-aquarium hobbyists. A key decision for the aquarium owner, and also one of the most fun to make, is choosing the fish for a tank. 500 Freshwater Aquarium Fish is a "window shopping" trip, with an expert alongside to offer crucial advice. This thorough directory details every appropriate species. While most of the fish featured require a heated aquarium, there are other popular varieties, such as goldfish, that...

The 7 Best Beginning Tropical Fish Species For Starting A New Aquarium

The 7 Best Beginning Tropical Fish Species For Starting A New Aquarium
by BlueRam Group


A detailed look at seven fish families that are suitable for beginning a tropical fish aquarium and one fish to never use for starting a new tank.

The book includes a detailed look at compatibility between families and their suitability for use in starting a small, medium or large aquarium.

Convenient tables are provided for a side by side comparison.

See something you like or something you'd like to see in the next version leave us a comment.

Thank You and Enjoy,

Steve Pond

Vanishing Species: Saving the Fish, Sacrificing the Fisherman

Vanishing Species: Saving the Fish, Sacrificing the Fisherman
by Susan R. Playfair (Author)


Vanishing Species is a narrative about groundfishing in New England waters over a five-year period when both the fish and the fishermen are threatened with extinction. It is also the story of the people who are laboring to save the fish, and of those who are laboring to save the fishermen. It is a story that should be read by anyone who likes to eat fresh fish and anyone who loves coastal communities. To some scientists and environmentalists, the fish stocks remain at levels too low to sustain further harvesting of the resource; to the fishermen, the fish are returning. Vanishing Species tells the story of these conflicting beliefs. Playfair has written a compelling book that asks how fish stocks became so low that they are endangered, and whether the fishermen are at fault or are merely...

A PocketExpert Guide to Reef Aquarium Fishes: 500+ Essential-to-Know Species (Microcosm/T.F.H. Professional)

A PocketExpert Guide to Reef Aquarium Fishes: 500+ Essential-to-Know Species (Microcosm/T.F.H. Professional)
by Scott W. Michael (Author)


Brilliant photography by the world's best underwater photographers and leading international aquarists highlights detailed profiles of more than 500 species of reef aquarium fishes in this new title in the Microcosm/T.F.H. Professional Series. Organized by family for easy reference, each profile includes all essential care, feeding, and husbandry advice. The species profiles include all available reef aquarium choices, with scores of seldom seen, rare, and recently discovered species. Written by the world's most-read, most-respected expert on marine fishes for the home aquarium, PocketExpert(tm) Guide to Reef Aquarium Fishes is a must-read for any fish enthusiast.

Fish of Wisconsin Field Guide

Fish of Wisconsin Field Guide
by Dave Bosanko (Author)


It's here: the perfect gift for fishermen! No tackle box is complete without this handy guide to fish in your state. In fact, this might be the best catch of the season! The book features more than 70 of the most important fish to know, with entries organized by family, state-specific facts, quick comparisons for easy identification, waterproof pages and more!

Tropical Fish: Tropical Fish Guide-Fresh Water Tropical Fish-A Compreshensive Guide to Take Care of Your Pet Fish (Fish, Fresh Water Tropical Fish, Tropical ... Guide, How To Take Care of Tropical Fish)

Tropical Fish: Tropical Fish Guide-Fresh Water Tropical Fish-A Compreshensive Guide to Take Care of Your Pet Fish (Fish, Fresh Water Tropical Fish, Tropical ... Guide, How To Take Care of Tropical Fish)


Learn A-Z of Tropical Fish, how to choose the best and inexpensive fish variety, how to choose tank and accessories, best feed and regular care of your pet fish
Today only, get this Amazon eBook for just $2.99. Regularly priced at $5.99. Read on your PC, Mac, smart phone, tablet or Kindle device.

You’re about to discover how to take best possible care of your topical fish. This guide goes deep into the fish types, selection of the best, criteria for aquarium and accessories, regular care and maintenance in cheap way.

Understanding just what is meant by tropical fish, what varieties this entails, and learning a bit about their natural habitat is of course going to be the first step toward learning how to take care of them properly. This is where this...

© 2015 BrightSurf.com