Articles tagged with Fish
Researchers are developing alternative culture methods to reduce the use of live fish in safety testing, reducing animal experimentation. Dr Richard Handy's perfusion method allows for the controlled exposure of fish organs to toxins, providing insights into toxicity and organ function.
A new species of snapper, Lutjanus alexandrei, has been discovered in the Abrolhos region of Brazil's South Atlantic Ocean. The species was previously mistaken for a dog snapper and was found to have distinct markings and color.
Commercially prized deep-sea fish are severely threatened by over-fishing and low reproductive success due to long lifespans, while technological advances have made targeting them easier.
Cornell researchers are developing a new genetic-based test to detect the deadly viral hemorrhagic septicemia virus (VHSV) in fish. The new technique, which can identify the virus in 24 hours, is set to be validated by the end of 2007 and could become the standard test for detecting this disease.
Researchers studying sedimentary records of dinoflagellates in the San Francisco area and along the western coast of North America predict an increase in toxic blooms. This change is linked to rising water temperatures, which will impact marine life and fisheries.
Researchers found females mature earlier when shown males with long 'swords', while young males delayed maturity to avoid competition. This is the first evidence of a species adjusting sexual maturation based on visual cues.
Researchers found that individuals preferred mating with unfamiliar close kin rather than non-kin due to parental cooperation. This led to more cooperative and resource-invested parenting among related parents compared to non-related ones.
The US shortnose sturgeon population has increased by over 400 percent in the Hudson River since the 1970s, marking a rare recovery of an endangered species. The study suggests that protection and conservation efforts can lead to successful recoveries, even in areas with high human activity.
A new study by Oregon State University and the EPA found that over 600 rivers in the western US have widespread mercury contamination in fish. Piscivorous fish like bass and walleye show significantly higher levels of mercury than non-piscivore species like trout.
Marine scientists discovered that baby fish can find their way back to their home coral reef by using their sense of smell, braving strong currents and predators. This unique ability has major implications for how reefs are managed and drives evolution on the Reef.
Research finds that commercial fishing causes significant variability in exploited fish populations, leaving them vulnerable to collapse. The study suggests that managing fish stocks must account for this increased variability to ensure their long-term sustainability.
A review of studies found that moderate fish consumption reduces coronary death by 36% and death rate by 17%. The study suggests that adequate consumption of other seafood is essential to minimize methylmercury exposure and ensure DHA intake.
A comprehensive analysis of fish consumption found that moderate intake reduces risk of coronary heart disease by 36% and total mortality by 17%. The benefits of omega-3 fatty acids from seafood also improve early brain development in infants, particularly when consumed by pregnant or nursing mothers.
Researchers studied environmental changes on fish appearance, finding restricted food and temperature shifts can dramatically alter morphology. The study has implications for conserving species, suggesting that habitat preservation is crucial to maintaining unique characteristics.
Researchers found that removing just one important species in a freshwater ecosystem can seriously disrupt its functioning. The study, led by Brad Taylor, showed that the loss of the flannelmouth characin had a significant impact on carbon transport and availability in a river ecosystem.
A study by Lessios and Robertson confirms close relationships between reef fish populations on both sides of the Pacific barrier, with gene flow occurring in both directions. The researchers rule out major changes in currents or geological events as barriers to population separation.
The survey found a diverse range of life, including new fish species, in Malagasy waters. The region's coral diversity is one of the richest in the Indian Ocean, making it a high conservation priority.
Researchers have discovered electric fish in Africa with the same DNA but different electric signals and appearances, sparking hope that they are on the verge of forming two separate species. The findings provide a rare example of sympatric speciation, where animals from the same geographic location diverge into distinct groups.
In Lake Victoria cichlid fish, females choose brightly coloured males for good reasons: fewer parasites and better health. The colour preference leads to speciation as only the brightest red and blue fish survive, eventually forming two separate species.
The Tiktaalik fossil exhibits a mix of fish-like and tetrapod features, bridging the gap between these two groups. The discovery supports the idea that evolution from water to land occurred gradually in shallow waters.
The newly found Tiktaalik species blurs the boundary between fish and land-living animals through its anatomy and lifestyle. The discovery provides critical early phase insights into the evolution of all limbed animals, including humans.
The discovery of Tiktaalik roseae fills the evolutionary gap between fish and limbed animals, revealing a gradual transition from water to land. The fossil shows characteristics of both fish and tetrapods, indicating that life on land evolved gradually in shallow waters.
Low oxygen levels in ocean 'dead zones' can induce sex changes in embryonic fish, leading to an overabundance of males and potentially threatening species with extinction. The study found that 75% of zebra fish developed male characteristics under low oxygen conditions.
Researchers suggest that seafood can play a role in reducing coronary heart disease, Alzheimer's, and other mental illnesses. Seafood is rich in omega-3 fatty acids like DHA, which support cognitive development and brain health. However, more research is needed to fully understand the risks and benefits of seafood consumption.
New research reveals deep-sea pelagic fish are congregating at the Mid-Atlantic Ridge for spawning, challenging long-held nomadic wanderer myth. MAR-ECO project discovers six new species and unusually large specimens, shedding light on deep-sea ecosystems.
A new study found that rapid larval growth in warm Caribbean waters is often disrupted by complex oceanographic processes, leading to variable settlement rates. Understanding these dynamics is crucial for managing and conserving fish populations.
A two-week expedition to Saba Bank Atoll in the Caribbean has discovered over a dozen new species of seaweeds, including commercially valuable ones, and recorded 200 fish species, compared to fewer than 50 before. The atoll's unique marine life makes it a prime candidate for designation as a Particularly Sensitive Sea Area (PSSA).
Researchers discovered that larval Antarctic fish have thin skin and undeveloped gills, protecting them from freezing temperatures. The production of antifreeze proteins increased gradually over three months, allowing the fish to adapt to their environment.
Researchers used a short-lived fish species to test the effects of resveratrol on aging-related physiological decay. The compound was found to increase longevity and delay the onset of memory and muscular performance decays.
Research highlights rapidly declining fish numbers in inland waters globally, with total catch quadrupling since 1950 and biodiversity at risk. Inland water fishing pressure shifts from species to species, leading to ecosystem collapse if left unmanaged.
Researchers at Virginia Tech are using stream fish to assess water quality, finding that different species respond to pollution in unique ways. This study aims to improve the accuracy of water quality assessments by incorporating fish movement patterns and diversity.
Researchers discovered that closely related cichlid species use different subsets of visual pigments to shape their color vision. Each species primarily expresses three cone pigment genes encoded by its genome, allowing for unique adaptations to their environments and ecological niches.
A synthetic pheromone has been found to effectively control Great Lakes lamprey populations by attracting them to traps and sterilizing males. The pheromone, PADS, was isolated after 15 years of research and is expected to be environmentally friendly and less expensive than current methods.
Researchers discuss challenges and potential solutions for restoring Iraq's depleted wetlands, including hydrology, soil quality, and species preservation. Iraqi ecologists present first comprehensive data set on the marshes' current state.
The study reveals a significant decline in the diversity of tuna, marlin, and swordfish by up to 50% over the past 50 years due to overfishing. The global hotspots map shows that these areas were once characterized by high species richness, but are now experiencing rapid changes
A study published in the Proceedings of the Royal Society reveals that in specific situations, unrelated African cichlid fish helpers must contribute more to their group to gain access and benefits. By analyzing genetic relatedness and behavioral observations, researchers found that under certain ecological conditions, non-relatives ta...
A new species of deep-sea jelly has been discovered that attracts small fish with hundreds of glowing red lures. The lures are used as deception to capture prey in an environment where fish are scarce, forcing scientists to reevaluate the role of red light in the deep sea.
Researchers have discovered a new catfish species in the Lacantún river of southern Chiapas state in Mexico, representing the 37th family of catfishes. The discovery highlights the vast knowledge gap in Mesoamerica's biotic legacy and conservation value.
A new family of catfish, Lacantuniidae, has been identified with a unique skeletal structure that sets it apart from other catfish families. The discovery sheds light on the evolutionary history of ancient fish species and their potential connections to dinosaurs.
Researchers at Virginia Tech are conducting a study on high-pressure processing to inactivate Norwalk virus, with the goal of making consumers safer from foodborne illnesses. The study will evaluate various high-pressure processing schedules and compare results obtained from human subjects to those obtained using mice.
A recent study found that male fish with larger gonopodia are more attractive to females for mating purposes, but simultaneously exhibit reduced swimming performance when trying to evade predators. The research suggests a trade-off between genetic size and predator escape value in certain fish species.
Research reveals that female mosquitofish choose males based on gonopodium size, which is linked to speed and predator avoidance. In contrast, larger genitalia may be favored in predator-free environments where the advantage outweighs the trade-off.
Researchers from Texas A&M University have found lower oxygen levels in the dead zone area of the Gulf, which could lead to more severe hypoxia and fish kills if physical conditions continue. The team studied an area between Southwest Pass, La., and the Calcasieu ship channel.
A new study reveals that overfishing of sharks triggers a domino effect of changes in abundance, contributing to the degradation of Caribbean reefs. The researchers found that sharks play a crucial role in maintaining the stability of the ecosystem, and their removal can lead to a decline in plant-eating fish populations.
Researchers found genetically similar fish in ecologically similar habitats across vast distances, contradicting the idea that geographical barriers drive speciation. This discovery supports ecological speciation and suggests a new approach to understanding biodiversity evolution on land and sea.
Researchers found that round goby abundance has increased dramatically throughout the Great Lakes basin since its arrival in 1990, leading to concerns over native species extinctions. Gobies have been shown to eat eggs and young of various native species, contributing to their decline or extinction.
The study found that only 10% of the original marshes survived as fully functioning wetlands after extensive drainage and irrigation, but also identified areas with high restoration potential.
A study by Larry Crowder at Duke University suggests that coastal dead zones in the Gulf of Mexico can have significant impacts on target species and commercial fisheries. The research group has found that fish and shrimp can evade death by relocating to the zone's edge, but growth rates of some Gulf fish and shellfish may be lower.
The study found that eelgrass significantly increased survival of silversides, tautog, and cunner even at low shoot densities. Macroalgae did not provide a similar benefit.
A new study found a strong link between low fish supply in Ghana and increased bushmeat hunting, leading to dramatic declines in terrestrial wildlife abundance. The research suggests that subsidized foreign fleets from the European Union are exacerbating the problem.
Researchers at Texas A&M University found that blue marlin caught in the Gulf of Mexico contain 20-30 times the acceptable levels of mercury. The team aims to understand why mercury accumulates in pelagic fishes and how it affects human health.
A study found that zebra mussel invasion leads to population declines in open-water fish like American shad, while sunfish species increase in abundance. The mussels' grazing on food particles and increased light penetration create more food for shoreline fish.
A study by University of Toronto researchers found high levels of mercury in sport-fish eaters' blood, particularly among Asian-Canadians. The findings emphasize the need for ongoing surveillance and education to minimize health risks from contaminated fish consumption.
A study by J. Todd Streelman found that human-induced disturbance accelerated the evolutionary process of cichlid fish, leading to two genetically distinct populations with distinct color patterns. The findings suggest a potential for rapid speciation and highlight the impact of human activity on evolutionary processes.
A Texas A&M University researcher is studying a large dead zone in the Gulf of Mexico, where fertilizers are suspected to be a major cause. The Mississippi River is creating a perfect storm for these chemical runoff events due to its massive size and high nutrient levels.
A Stanford study on threespine stickleback fish found that a single gene, Pitx1, is responsible for the loss of hind fins in two distinct populations. The researchers discovered that mutations in this gene can alter limb development without killing the animal.
Scientists studying an Antarctic 'cod' are gaining insights into how its unique physiology helps it survive in icy waters. By understanding how the fish adapts to environmental change, researchers hope to develop new treatments for human heart conditions.
A new species of deep-sea predatory fish, dubbed Eustomias jimcraddocki, has been discovered by Dr. Tracey Sutton at the Harbor Branch Oceanographic Institution. The species exhibits unique bioluminescent features and varying barbel patterns, challenging previous assumptions about its functionality.
A 3,360-acre marine protected area has been established off Belize's southeastern coast to safeguard the region's highest priority area for conservation. The area is home to over 25 reef fish species and is a key spawning ground for the endangered whale shark.
Research finds a direct relationship between puffins' breeding success and temperature, with warm waters hindering their ability to catch fish and abandon chicks. The study warns of potential extinctions if warming continues or increases in frequency.