Fish Chat and Slam November 2019
Fifty fish biologists from 15 organizations participated in a three-day Fish Chat and Slam event in South Florida on November 5-7, 2019.
Asian Carp
Asian Carp
After their introduction to the United States, Asian carp spread quickly. As their numbers grow, native fish populations are impacted, as is the aquatic habitat. Humans are at risk too; boaters have been injured by the silver carp as it jumps out of the water. The common and grass carps can be found in almost every state, though bighead and silver carps are mainly found in the Mississippi River drainage basin. Though black carp have been collected in the Mississippi River, they are not thought to be established yet.
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Comparative Freshwater Fish Toxicity Testing of Antimycin A
Researchers are investigating the influence of Antimycin A on invasive carp and non-target fishes by measuring the effects of a novel species-specific bait formulation.
Survey and Assessment of Live Food Markets as an Invasion Pathway
Live food markets may be a source of the increasing number of non-native wild invertebrate and fish species, like Asian swamp eels and snakeheads. USGS is surveying such markets around the United States to identify and document species that might be of concern if released live into the wild to assess if the live food market is a possible invasion pathway.
A Website Tool for Predicting Triploidy in Larval Fish Spawns
Differentiating diploids from triploids at the earliest life stage possible allows for a more efficient use of resources including production time and rearing space. Thus, a reliable flow cytometric (FCM) method has been developed to discriminate triploids from diploids at the larval stage. In order to help simplify the process of differentiating triploids from diploids, we propose a simple...
Flow Cytometry Applied to the Animal Kingdom in Studies of Natural Resource Science
Flow cytometry is a technique for rapidly analyzing large numbers of animal cells using light-scattering, fluorescence, and absorbance measurements.
Determining the Ploidy and Resultant Reproductive Capability of Artificially Spawned and Wild Caught Asian Carp
The invasive grass carp and black carp are artificially spawned to produce triploids, which means they have three sets of chromosomes and are sterile. WARC scientists invented an early ploidy prediction process for produced fry, and a post-mortem assessment method for carp caught either in the wild or sold and hauled live to other states.
Genetic Analysis of Wild and Captive Black Carp in the Mississippi River Basin
Black carp have likely been present in the Mississippi River since the 1990s, but their current distribution and spread is not well understood. Genetics is helping to shed light on this species, including its diversity, the relatedness of wild and captive fish, and its introduction history.