Articles tagged with Ichthyology
Researchers developed robotic fish inspired by the weakly electric black ghost knifefish to study fragile coral reefs and investigate sunken ships. The technology improves underwater vehicles' agility, allowing them to navigate complex geometries in murky waters.
A recent study found that six common species of fish near the equator are unable to survive in warmer waters, with some species experiencing a narrow temperature range. This suggests that climate change poses a significant threat to these fish populations, which could have devastating consequences for human societies reliant on them.
The USGS study highlights the importance of streamflow characteristics in assessing fish community change and identifies areas with high risk of ecological degradation. Changes in streamflow can lead to declines in fish diversity by up to nine species, emphasizing the need for effective management decisions.
A team of researchers has identified more than 180 species of fish that exhibit biofluorescence, a phenomenon where organisms absorb and emit light of different colors. The study reveals the widespread distribution of biofluorescence across marine fish species, indicating its potential use in communication and mating.
A Dartmouth-led study reveals that arsenic exposure can be significant through dietary means, especially from consuming alcohol and Brussels sprouts. Researchers found a strong correlation between toenail clippings and arsenic levels, particularly in those who drank more alcohol and ate more dark meat fish.
A 10-year study on national wildlife refuges found frog abnormalities at less than 2% overall rate, but higher rates in specific 'hotspots'. The study suggests that these hotspots have local causes and can recover over time.
The changes to Canada's fisheries legislation have removed habitat protection for most fish species, according to a study by University of Calgary and Dalhousie University fisheries biologists. The removal of habitat protection is inconsistent with ecosystem-based management and has been described as politically motivated.
A new nomenclature for genetic sequences addresses taxonomic determination issues by providing a reliability ranking. The GenSeq system ranks sequence data from primary types, secondary types, and non-types, enhancing integration of molecular phylogenetics and biological taxonomy.
Researchers at NYU-Poly used underwater robots to examine how golden shiner fish interact with a robot's coloration, size, and movement. The results show that the fish are drawn to a robot mimicking their natural colors and movement patterns, influencing their swimming behavior.
Researchers found that flooded Yolo Bypass rice fields create productive aquatic food webs for salmon, with high growth rates and minimal mortality. The findings suggest farm managers can use these agricultural fields to mimic natural processes, benefiting both fish and farmers.
Researchers developed precise monitoring systems by analyzing gut microbiota of invasive Asian carp and native gizzard shad, revealing key differences between species. The study uses next-generation gene sequencing technology to identify biomarkers for each species, promising a new approach to preventing their spread in the Great Lakes.
Researchers found that warmer waters increase killifish's metabolic rate, leading to higher methylmercury levels in their tissues. This suggests a global warming impact on mercury bioaccumulation in marine life, posing health risks to people who eat seafood.
Researchers evaluated nine commonly used anaesthetics and found that several cause stress responses in zebrafish. Etomidate was deemed the most suitable for future routine use, improving the welfare standards of millions of fish used in scientific research worldwide.
Researchers at UCSB created an Eventual Threat Index (ETI) that quantifies biological and socioeconomic conditions leading to unsustainable harvest rates. The study predicts overfishing threats for eight Pacific tuna species, including yellowfin tuna, using data from the 1990s to present.
A recent UCSB study analyzed whole-body fish samples from oil-and-gas production platforms and natural sites for heavy metal pollutants. The results showed that most elements were consistently present at both types of locations, with some species exhibiting varying levels of pollutants between juveniles and adults.
Researchers have solved the mystery of how mercury enters open-ocean fish, finding that up to 80% is produced deep in the ocean by bacteria. Mercury levels are likely to rise in Pacific fish over the coming decades due to increased industrialization in Asia.
A recent study by Ben-Gurion University researchers found that divers are willing to pay to improve aspects of reef biodiversity, with respondents ranking biodiversity as the most desirable value. The study's findings may help inform conservation efforts and direct the design of future marine reserves.
Researchers found that juvenile Atlantic salmon raised in enriched tanks with pebbles, rocks, and artificial plants outperformed those in standard tanks. The study suggests that creating more natural environments can boost fish intelligence and adaptability, leading to higher survivability when released into the wild.
A University of Pittsburgh study found that diets lacking omega-3 fatty acids can worsen effects over consecutive generations, particularly affecting teens. Adolescents with omega-3 deficiencies showed increased anxiety and hyperactivity, impaired learning and memory, and problem-solving abilities.
A 10-year study by the Virginia Institute of Marine Science found that low-oxygen 'dead zones' in Chesapeake Bay are impacting demersal fish species, including Atlantic croaker and summer flounder. The study showed a drastic decline in species richness and catch rates under low-oxygen conditions.
Studies of early development in fishes reveal a single compartment in the hindbrain controlling vocal and pectoral mechanisms, which may explain why humans use hand gestures when speaking. This neural connection could be key to understanding the evolution of language.
Research finds that boat noise can scare fish away from their habitats, disrupting ecosystem balance. The study suggests regulating human activities in protected areas to mitigate the impact of noise pollution on marine communities.
Researchers have successfully implemented a genetic-based fish tagging method, called parentage-based tagging (PBT), in the Snake River Basin. This non-invasive approach allows for the collection of detailed information about hatchery-reared fish, enabling more effective fisheries management and conservation efforts.
A new study finds a U-shaped association between fish consumption and atrial fibrillation risk, with moderate intakes offering the greatest protection. The lowest risk was found in individuals consuming around 0.63g of marine n-3 polyunsaturated fatty acids per day, corresponding to two servings of fatty fish per week.
Research on weakly electric fish reveals the complexity of their electrocommunication methods, including multiple neural coding systems and diverse behavioral responses. The study sheds light on the evolution of these unique sensory systems in different species.
Biologist Keith Gido is discovering dramatic changes in native fish communities due to the North American drought. River fragmentation and groundwater withdrawals are affecting aquatic systems and native fish species in the Great Plains.
A study by scientists from the University of California, Davis predicts that 82 percent of California native fish will become extinct within the next century due to climate change. The research found that native freshwater species are particularly vulnerable to extinction, while non-native species are expected to thrive.
Researchers say that conserving major tributaries in the Mississippi River Basin may be a more effective approach to saving large-river fish. Studies found that rivers with flow rates above 166 cubic meters per second support 80% or more of large-river species, making them crucial habitats for these fish.
New research from the University of Exeter suggests that small fish with aggressive personalities are more likely to win food contests against larger, passive counterparts. The study found that consistently aggressive fish were able to put on weight and survive in resource-scarce environments.
A study by University of Maryland biologist Daphne Soares reveals that guppies jump up to eight times their body length at speeds of over four feet per second. The biologists hypothesize that this behavior allows guppies to disperse and reach all available habitat, minimizing competition and maintaining genetic variability.
A new 'tree of life' for fishes has been recharted with the help of genetic and physical information, revealing significant changes to existing ideas on fish relationships. The research improves scientists' ability to predict how closely related species might react to environmental factors like climate change.
Researchers at UBC estimate China's foreign catch is 4.6 million tonnes per year, taken from the waters of at least 90 countries, including 3.1 million tonnes from African waters.
A recent Harvard study found that consuming fish rich in omega-3 fatty acids significantly lowers the risk of mortality among older adults, with blood levels linked to extended lifespan. The research suggests that adequate omega-3 intake can extend years of remaining life.
Research in Papua New Guinea reveals that local community-led efforts to regulate fish catches benefit both the fishermen and their neighbors. The study found that many larvae produced by managed adults return to the same fish population, highlighting the effectiveness of cooperative management.
The study confirms common ancestry but divergence of the two species adapted to semi-arid conditions with drastic hydrological regime changes, emphasizing habitat protection measures for their genome integrity.
Researchers found that clownfish fan their anemone hosts to increase oxygen consumption, benefiting both species. The fish's nocturnal antics may also improve circulation in the anemone, supporting life under low oxygen conditions.
A new study found high levels of antibiotic resistance in ornamental fish, with some species showing up to 77% resistance to certain antibiotics. The risk to humans is generally minor, but transmission from tropical fish has been documented and poses a concern for those with compromised immune systems.
A University of Washington-led study found that the potential harvest of most fish stocks is largely unrelated to abundance, with only 18% controlled by abundance. Environmental conditions and regime shifts play a significant role in determining productivity, highlighting the need for improved management methods.
A study of 900 Spanish consumers found that country of origin is the most important factor when buying fish, with Spain being the preferred choice. The majority of respondents prefer wild fish and fresh products, highlighting a trend towards domestic consumption.
Researchers found that over 14,000 fish from Czech Christmas markets aligned themselves along the north-south axis, suggesting an unknown capacity for geomagnetic sensing. The fish's orientation was unaffected by human presence or environmental stimuli, pointing to a likely geomagnetic cue.
Researchers used hatchery technology to test the impact of DWH oil on mahi mahi embryos, finding that even low levels of PAHs can cause significant physiological damage. The study also revealed that photo-enhanced toxicity can increase sensitivity by up to 20-fold, affecting fish swimming performance and survival.
Researchers found that archer fish modulate water jet velocity to create a single large drop that hits prey with great force. This approach avoids the need for specialized internal structures, allowing the fish to achieve powerful impact without significant evolutionary costs.
A study by Dr. Grace Saba and professor Deborah Steinberg reveals that small forage fish can transport significant amounts of carbon from the surface to depth via their fecal pellets, which sink at rates of hundreds to thousands of feet per day.
A study found that low-level prenatal mercury exposure increases the risk of ADHD-related behaviors in children, while moderate fish consumption during pregnancy reduces this risk. Researchers recommend pregnant women consider both benefits and risks of eating fish while pregnant.
A new study projects a 14-20% decline in maximum fish body weight by 2050, with the tropics being most impacted. The research highlights the need to curb greenhouse gas emissions and monitor changes to ocean ecosystems.
A new study by researchers at The University of Akron found that leptin may play a role in hearing and vision loss in humans. Leptin also affects the development of eyes and ears in fish, suggesting a potential link to sensory loss.
A recent study led by the Institute for Ocean Conservation Science provides a first-time analysis of the value of forage fish to both commercial fisheries and marine ecosystems. The research found that forage fish contribute significantly to global fisheries, with a total estimated value of $16.9 billion annually, representing 20% of g...
Researchers developed a method to analyze ear-bone 'tree rings' to track juvenile fish movements, revealing surprising plasticity and long-distance migrations between habitats. This study has important implications for management and protection of coral reefs.
A recent study published in Genome Biology and Evolution found that paddlefish have a duplicated genome, adding complexity to comparative studies. This discovery may require re-interpreting previous research on the fin-to-limb transition using paddlefish as a proxy for human ancestors.
Researchers studying zebra fish mouth formation have identified a potential developmental pathway related to Fraser syndrome deafness in humans. The study found that a fras1-dependent 'endodermal outpocket' may underlie some ear defects in Fraser patients, suggesting a connection between skeletal development and hearing loss.
Researchers found that BPA alters fish behavior and appearance, leading to inter-species breeding. This process poses long-term ecological consequences, including the potential decline of native species.
A study led by University of British Columbia researchers found that the EU pays less than it did two decades ago while catching more fish in Madagascar's waters. The total annual income for Madagascar decreased by almost 90% between 1986 and 2010 due to unfair access fees.
Biologists at The University of Texas at Austin discovered that humans, fish and frogs share neural circuits responsible for diverse social behaviors. These circuits have existed for over 450 million years, indicating a common genetic framework for the evolution of new behavior.
Research reveals that salmon raised in hatcheries can harm wild populations through competition for food and habitat. This has significant implications for long-term survival of wild salmon species, highlighting the need for caution and further research to ensure sustainable fisheries management.
A worldwide survey found that all continents except Antarctica have regions where dam obstruction poses a significant threat to freshwater organisms. The study identified 18 ecoregions with notable numbers of fish species at risk, including the Murray-Darling Province in Australia and the South Atlantic coast of the United States.
Herbivorous fish play a vital role in maintaining the health of coral reefs by limiting algae growth. A diverse supply of these fish provides strong 'insurance' against environmental fluctuations, reducing the risk of regime shifts towards seaweed-dominated reefs.
Researchers found that reducing fishmeal in farmed fish diets leads to lower health and growth. The cobia fed with reduced fishmeal had higher levels of metabolites linked to physical stress and lower levels of primary energy sources. In contrast, the diet with full fishmeal showed more normal growth and energy production.
A team of female scientists from the University of Miami Rosenstiel School of Marine, Atmospheric, and Earth Science have developed a sophisticated numerical model to study fish larvae's navigation skills. The model uses reliable larval swimming speeds and vertical migration to create realistic scenarios that can be studied in detail.
Research from the University of Bristol and Radboud University Nijmegen found that young French grunts are attracted to coral reef noises and muddy soft-sediment smells, but only visual cues of familiar fish guide them to their shoal mates. This hierarchical approach allows the fish to navigate safely in complex habitats.
Researchers at Baylor University found that fish exposed to Selective Serotonin Reuptake Inhibitors (SSRIs) display abnormal behavior and reduced anxiety. The study used digital tracking software to monitor shelter-seeking behavior in fathead minnows under laboratory conditions.