The aquatic habitats of the Taquari-Antas river basin (in the Patos Lagoon basin, southern Brazil) are under marked environmental transformation because of river damming for hydropower production. In order to provide an information baseline on the fish fauna of the Taquari-Antas basin, we provide a comprehensive survey of fish species based on primary and secondary data. We found 5,299 valid re...

Henochilus wheatlandii, the only species of this genus, is critically endangered and was considered extinct for over a century. The rediscovery of this fish in 1996 made it possible to study its phylogenetic relationships with other species in the subfamily Bryconinae. The aim of this study was to characterise the karyotype of H. wheatlandii. Standard staining, C-positive heterochromatin and nu...

Genetic divergence in the Snail Kite S. E. Haas t al. HORT COMMUNICATION Genetic divergence among Snail Kite subspecies: implications for the conservation of the endangered Florida Snail Kite Rostrhamus sociabilis S. E. HAAS, 1 R. T. KIMBALL, 1 J. MARTIN 2 & W. M. KITCHENS 2 * 1 Department of Zoology, University of Florida, PO Box 118525, Gainesville, Florida 32611, USA 2 Florida Cooperative Fi...

Recovery of depleted species is difficult, but it can be especially complex when the target species interacts strongly with other depleted species. Such is the case for northern and southern resident killer whales Orcinus orca which are listed as ‘endangered’ under the US Endangered Species Act (ESA) and Canada’s Species at Risk Act. These resident killer whales prey heavily on Pacific salmon O...

In January 2020, a mortality event was documented in endangered Pallid Sturgeon (Scaphirhynchus albus) at the Neosho National Fish Hatchery (Neosho, MO, USA). Moribund fish appeared emaciated, with hemorrhages on fins and rostrums. Mortality steadily increased, prompting an investigation into cause. No viral or bacterial pathogens were detected; however, high number of novel Gyrodactylus sp. id...

Groupers are highly susceptible to human-induced impacts, making them one of the most threatened fish families globally. Extinction risk assessments are important in endangered threatened species management, however the most comprehensive—the International Union for Conservation of Nature (IUCN) Red List—cannot classify approximately one-third of grouper species due to data deficiency. We used ...

Two programs within the U.S. Fish and Wildlife Service‟s Habitat Credit Trading Program currently exist to allow for “banking” of habitat credits: traditional Conservation Banking and the recently introduced Recovery Crediting System (RCS). Both of these mechanisms embody the intent of Executive Order 13352 on Facilitation of Cooperative Conservation and the environmental stewardship and stream...

Honest, it's just a " narrow regulatory change, " US Interior Secretary Dirk Kempthorne told reporters when his department was revealed to be altering the Endangered Species Act in the last months of the Bush Administration. Journalists didn't buy it. As the New York Times put it in an editorial, " The Bush administration has never masked its distaste for most environmental laws or its ambition...