Articles tagged with Fresh Water Fishes
A new study by Environmental Working Group scientists reveals that consuming one serving of freshwater fish per year is equivalent to ingesting water with high levels of the toxic chemical PFOS for a month. The study analyzed data from over 500 fish samples and found median amounts of PFAS in freshwater fish to be 280 times greater tha...
A team of scientists from Michigan State University conducted a study to track the supply and demand of fish in sub-Saharan Africa, revealing surprising gaps in traditional analysis. The research found that smaller fish species like usipa were more widely available than larger species like chambo, but policies were prioritizing the lat...
A six-year study confirms stream contamination with pesticides from trespass cannabis cultivation sites in Northern California, threatening local aquatic species and freshwater resources. The study's findings highlight the need for proactive approaches to mitigate the impacts of these sites on downstream waterways and habitats.
A new review highlights the lack of understanding about non-game native transplant (NGNT) fish in the US, which can have significant impacts on ecosystems. Researchers urge anglers and aquarium hobbyists to take steps to prevent NGNT invasions, such as not releasing bait fish into different watersheds.
A new study found that social, economic and political barriers hinder the global distribution of the $424 billion aquatic food industry's benefits. The study calls for policies to ensure equitable access to this sector, which supports both welfare-based benefits like jobs and affordable nutrition, as well as wealth-based benefits.
A new study by Grant Brown and Braeden Donaldson found that juvenile convict cichlids exposed to high-risk alarm cues have brains 16% larger compared to low-risk groups, with noticeable increases in olfactory and optic bulbs. The brains revert to normal size after removal of the alarm cues.
Researchers at Radboud University found that larger fish and those with large cells are more sensitive to oxygen stress in warm water. Freshwater fish appear to be more tolerant of oxygen-depleted water than marine fish, likely due to different selection pressures during their evolutionary history.
The Amazon River's biodiversity is under strong fishing pressure, indicating a stress that menaces the region's ability to provide protein and other essential nutrients. The research found that large-bodied species are more vulnerable to overexploitation and being replaced by smaller species.
Researchers evaluated the toxicological effects of BaP on bay scallops, finding increased immune response-related parameters with time at higher concentrations. The study suggests that BaP dampens the immune response of scallops and decreases their capacity to respond to oxidative stress.
Two new species of Amazonian fish have been discovered and described by Smithsonian researcher Murilo Pastana, one with vibrant red-orange fins and another that is technically a miniature fish. The species are at risk of extinction due to deforestation in the region where they inhabit.
A major new study is investigating the effects of beavers on the Arctic landscape, other animals, and local Indigenous communities. The project aims to understand the complex interlinkages between ecological and sociological changes as beaver numbers increase.
Research confirms that fish become sexually active and spawn due to growth-induced respiratory stress. The study found a consistent metabolic ratio across 133 species of fish, which supports the idea that reproduction is initiated by changes in oxygen supply and demand.
Researchers found that sulphur mollies create surface waves to deter predators, with the wave number decreasing capture probability. The collective behavior has anti-predator benefits, providing protection from bird attacks.
A team of biologists and engineers created a robotic fish that scares mosquitofish away, altering its behavior and physiology. The study found that the mosquitofish showed fearful behaviors, weight loss, and reduced fertility when confronted with the robot.
The study, published in Scientific Reports, used eDNA sequencing to investigate fish diversity in the Amazon River basin. Researchers found that only 26% of species identified with precision at the species level could be linked to traditional catch data.
Researchers found a new species of candiru attached to the surface of an Amazonian thorny catfish, suggesting a commensalistic relationship where the parasite benefits without harming its host. The discovery challenges traditional views of vampire fish and highlights the complexity of these unusual relationships.
Researchers analyzed museum specimens to find that fish have been ingesting microplastics since the 1950s, with concentrations increasing over time. The study highlights the importance of natural history collections in museums and serves as a wake-up call for addressing plastic pollution.
A global summary of species functions revealed that more than half of species perform less than 20% of the group's functions, with only a few species performing unique roles. This study highlights the importance of conserving functionally unique species to maintain ecosystem services and human well-being.
A recent study published in Nature Communications found that global warming poses significant threats to the habitats of approximately 11,500 freshwater fish species worldwide. Limiting global warming to 1.5 degrees Celsius can reduce the number of species at risk from over half to just 4%.
A recent study reveals that inland fisheries are providing vital micronutrients and animal-source protein to sustain 159 million people. The global economic value of inland catch is estimated at $24 billion, highlighting its importance in local rural economies.
The Ohio River Basin's freshwater fish species richness has increased significantly over the past 57 years, with a positive trend observed from 1957-2014. This change is attributed to environmental modifications related to land use and hydrology alterations, resulting in more fish species feeding on plant matter and detritus.
A new study reveals that many European freshwater fish species, especially those in the Mediterranean region, are threatened by climate change. The research identifies regions and species particularly susceptible to rising water temperatures and changing habitats.
A study using household surveys estimated that 9.26 million metric tons of wild-caught freshwater fish were consumed in low-income and middle-income countries, compared to the reported 5.6 metric tons. This represents a significant underreporting of global freshwater fish catches, with potential implications for food security and susta...
Since 1840, European freshwater fish species have undergone significant changes, with non-native species outnumbering native ones. Human activities, such as habitat destruction and intentional introductions, have led to an increase in taxonomic homogenization across Europe.
A study by University of Wisconsin-Madison researchers found that 90% of globally caught fish are from rivers with high environmental stress levels. Freshwater fish provide animal protein for 158 million people worldwide, particularly in countries like Cambodia and Bangladesh.
The University of Melbourne has uncovered twenty new freshwater fish species in the remote Kimberley region, increasing Australia's total known species by almost ten percent. The discovery highlights the hidden wealth of biodiversity within the Kimberley and has major implications for conservation efforts.
New research reveals how mountain ranges on New Zealand's South Island directly impacted the evolution of diverse freshwater fish species. The study shows that the island's landscape developed in six main tectonic zones, each with distinct river drainage catchments, which led to divergent fish DNA sequences over time.
A comprehensive biological study refutes a long-standing geological fact, showing plants and animals migrated between North and South America nearly 30 million years ago. This new information changes our understanding of biodiversity and climate, both at regional and global levels.
According to a study by Noel M. Burkhead, North American freshwater fish extinctions have increased noticeably after 1950, with at least 57 species and subspecies going extinct since 1898. The rate of extinction is estimated to be at least 877 times the background extinction rate over geological time.
In a study on Trinidadian guppies, females spend time with more attractive companions to reduce harassment from males. This strategy is successful in minimizing interactions with males and increasing mating opportunities.
Researchers observed dense groups of Wels catfish in the Rhone River, estimating a total biomass of up to 1132 kilograms. These aggregations could excrete large amounts of phosphorous and nitrogen, creating potential biogeochemical hotspots.
Researchers used DNA barcoding to reveal that parasites infecting freshwater fish mostly specialize on specific hosts, except for those targeting the eyes which can infect many different species and even frogs. This discovery may have practical benefits for wildlife managers and fish farmers.
Researchers found that freshwater fish like largemouth bass, which feed primarily on fish, have remained relatively unchanged over time. Once they evolved the optimal size and shape for catching fish, natural selection kept them in an evolutionary holding pattern.
Biologist Zeb Hogan sets the record straight about a purported record-breaking 771-pound stingray, saying it was never weighed. The fish, caught in central Thailand, is estimated to weigh between 550-770 pounds and may be the world's largest freshwater fish.
According to the USGS report, nearly 40 percent of North American freshwater fish species are now listed as vulnerable, threatened, or endangered. Habitat loss and climate change have contributed significantly to these declines.
Researchers used DNA barcoding to identify 190 species of Canadian freshwater fish, representing a significant advance for conservation practices. The approach was successful in 93% of cases, offering promise for species-level identification and management.
A recent study identifies seven regions where non-native freshwater fish species make up over a quarter of the recorded species, highlighting the need for surveillance and precautionary measures. The research suggests that human economic activities are the main driving factor behind exotic species invasions in these regions.
A new species of cichlid, Ptychochromis loisellei, has been named in honor of Dr. Paul Loiselle, an ichthyologist who has dedicated his career to safeguarding Madagascar's freshwater fishes. The newly described black and gold cichlid is about five inches long and found in several river systems in the northeastern part of the country.