Articles tagged with Fish
Fish populations that gather and spawn in large groups face growing threats from overexploitation and inadequate management. Insufficient regulation allows a few active boats to deplete these vulnerable populations, while changing economic conditions may lead to rapid species declines.
A new large fish species, Myloplus zorroi, has been discovered in the Amazonia region of Brazil. The fish is characterized by its distinctive teeth, specialized to crush seeds, and a reddish silver color with darker markings. It grows up to 47.5 cm in length and dwells in moderately to rapidly flowing clear rivers.
Researchers have mapped whale calls to reveal species-specific feeding centers along Georges Bank, where humpback whales congregate in two main clusters and minke, fin, and blue whales set up territories in between. The team's results suggest predator and prey interactions are influenced by territorialism or foraging mechanisms.
Intense fishing changes fish characteristics, passed down to future generations, causing population fluctuations and destabilizing the ecosystem. The study simulates these effects in Lake Constance, highlighting the importance of considering the entire ecosystem when evaluating fishing impacts.
Most aquatic species sense sound via particle motion, yet few studies have included measurements. Researchers from the University of Exeter and others have developed user-friendly tools to maximize its uptake and understand the impact of man-made noise on aquatic life.
Akinori Teramura's Twitter post revealed the first recorded case of illegal bluegill fish release in Japan, sparking concerns about native aquatic insect biodiversity. The researchers concluded that the fish were likely released from an aquarium or home aquarist, highlighting the need for community awareness and improved reporting.
A new study from the University of Southampton found that inland freshwater fisheries with higher biodiversity have higher-yielding and more stable fisheries. The research suggests that maintaining healthy freshwater systems is critical for food security and livelihoods, particularly in developing countries.
Climate change is forcing species of migrating fish to shift their range towards the poles, affecting people who depend on them. Wealthier communities with stronger resource management tend to benefit more from these changes, exacerbating global inequality.
A 90-million-year-old fossil fish has been identified as a new species, Pentanogmius fritschi, with a tuna-like body and unique 'hook-shaped sail'. The discovery was made by Kenshu Shimada and his team at the Perot Museum of Nature and Science in Dallas.
Eating fish more than three times a week during pregnancy was associated with increased risk of rapid growth in infancy and childhood obesity. Women who consumed high amounts of fish had children with higher BMI values at various ages compared to those who ate less.
Researchers have discovered that pectoral fins in fish possess neurons and cells sensitive to touch, conveying information about pressure and motion. This finding sheds light on the evolutionary biology of touch and may inspire new advances in underwater robotics design.
Two new fossil fish species of Rhinconichthys have been discovered from the Cretaceous Period, with a greatly expanded geographical range. The newly named R. purgatoirensis and R. uyenoi have tripled the number of species in the genus.
Motorboat noise increases stress levels in young coral reef fish, reducing their ability to flee from predators. This study found that boat noise can halve survival chances and double the capture rate of fish.
Researchers at the University of Basel have developed a simple and effective test to detect Ponto-Caspian gobies in streaming and stagnant water. The method uses environmental DNA analysis, reacting exclusively to the genetic material of invasive gobies, making it a cost-efficient alternative to traditional methods.
Researchers show that intense male competition can lead to speciation, erasing boundaries between species and creating new ones. This process is independent of natural selection and has significant implications for understanding biodiversity.
Researchers have discovered that the shape of a fish's tail is a key predictor of its ability to live across different depths on coral reefs. Fish with more forked tails are better adapted to survive in both shallow and deep habitats, thanks to their stealth swimming capabilities.
A global assessment reveals that marine protected areas (MPAs) insufficently protect the evolutionary history of tropical corals and fishes, with less than a quarter of wrasse species receiving minimum protection levels. The study suggests that protecting the genetic history of living organisms is crucial in a changing world.
Researchers found that DNA methylation plays a key role in regulating social dominance in cichlid fish. By altering gene expression, these fish can change their social status, which is linked to better health and quality of life.
A new study suggests that Asian carp could cause declines in most fish species in Lake Erie, including walleye and rainbow trout, while smallmouth bass may increase. The model results show that Asian carp could eventually account for up to 34% of the total fish weight in the lake.
A new study by the University of Michigan predicts that Asian carp invasion in Lake Erie could lead to declines in most fish species, including walleye and rainbow trout, but smallmouth bass may increase in weight. The invasive carp could account for up to 34% of the total fish weight in the lake.
Researchers found that areas previously depleted of salmon are on a fast track to recovery, with American dipper birds showing improved physical condition and reproductive success when accessing salmon. The studies suggest rivers can recover within a generation after dam removal, offering a promising conservation outcome.
Researchers have uncovered a 380-meter-deep time capsule from Lake Malawi, providing unprecedented insight into the past of this African lake. The study found that changes in lake level over the last 1.3 million years played a significant role in the development of the lake's diverse fish species.
Researchers found that certain fish species exhibit lower polarization contrast with their backgrounds, making them harder to spot. The platelets in these fish align on vertical axes to reflect downward-directed light and diffuse horizontal-axis light, providing enhanced camouflage abilities.
A recent study found that high concentrations of carbon dioxide deter even small invasive carp from entering areas with elevated CO2 levels. The gas causes stress and avoidance behavior in fish as young as eight days old, providing a non-physical barrier against the species.
A 359 million-year-old mass extinction event triggered a drastic transformation in Earth's vertebrate community, with smaller fish dominating the oceans for at least 40 million years. The findings suggest that small, fast-reproducing fish possessed an evolutionary advantage over larger animals in the disturbed environment.
Seals are having no significant impact on commercial fish populations off the south and west coasts of Ireland, according to a new study. The researchers found that seals primarily eat smaller fish, which are abundant in numbers, thereby not competing with fishermen for the valuable stocks.
A study on the Belizean Barrier Reef found that fish larvae typically disperse no more than 1.7 kilometers from their parents, highlighting the need for connected marine reserves to conserve biodiversity and sustain fisheries.
A team of researchers argues that certain countries are misinterpreting the term 'rational use' as a license for unrestricted fishing. The study's authors claim this interpretation is not supported by international accords, and argue that sustainable fishing practices should be prioritized instead.
A team of researchers discovered that fishes' jaw protrusion ability is a relatively new trait, appearing only in the last 100 million years of their 400-million-year history. This finding suggests that the evolution of jaw protrusion played a crucial role in the success of spiny-rayed fishes.
Research reveals fish have a more efficient oxygen delivery system than humans, allowing them to thrive in various water conditions. This adaptation is crucial for their survival, particularly during times of stress or low oxygen levels.
A new study found that species extinction can lead to secondary extinctions of parasites, compromising ecosystem stability and biodiversity. Researchers identified key host species that contribute to the overall network structure of fish communities and are essential for maintaining a healthy ecosystem.
A University of Washington study reveals that young chum salmon thriving in Elliott Bay's restored beaches have access to a more diverse range of prey. This shift could provide a nutritional boost for the fish, but may also come at an energy cost as they adapt to changing food sources.
New research from Wake Forest University reveals little difference in the force delivered by archerfish's water jets to targets at different distances. In a surprising twist, fish prefer closer targets when given the choice, likely due to time constraints for prey capture.
Researchers at Case Western Reserve University have developed a fast and inexpensive test to determine whether Asian carp invading Lake Erie are sterile or can reproduce. The technique uses microscopic examination of fish blood cells, allowing conservation agents to quickly identify problem animals and remove them from the population.
A James Cook University study found that redthroat emperor fish retreat to deeper water in response to warmer temperatures. The species, commercially important for fisheries, may need to be redirected due to the shift in their habitat.
A special journal issue highlights real-world applications of conservation genetics in Latin America, from combating wildlife smuggling to exposing consumer fraud. Researchers used genetic techniques to characterize jaguar populations and identify piracatinga fish as a substitute for river dolphins.
Researchers from the Smithsonian Institution have discovered a new species of goby fish that differs significantly from its relatives in terms of size, color, and habitat depth. The study highlights the importance of exploring deep-sea reefs to understand the true extent of tropical reef biodiversity.
Researchers at the University of Toronto predict which plants and animals may be vulnerable to climate change by analyzing historical data on 30 fish species in over 1,500 lakes. The study found that bass and smaller fish species can wipe out vulnerable fish species due to predation and resource competition.
Researchers have developed a cost-effective way to help ecosystems recover from human disturbances like shipping and fishing. The method uses ecological traits like resilience to optimize connections between populations, enabling conservation staff to make informed decisions about recovery plans.
Research from NIMBioS found that the timing of spawning is crucial for the survival of larval fish, with success rates higher on days when spawning is observed to occur. This study has important implications for fisheries management and conservation, highlighting the need to protect spawning aggregations.
Scientists discover that mass extinction event triggered by asteroid strike led to the rise of ray-finned fishes as the ocean's most diverse and dominant vertebrates. The abundance of ray-finned fish teeth began to explode after the extinction event, becoming eight times more abundant in 24 million years.
The study highlights seven potential benefits of pairing territorial use rights in fisheries (TURFs) and marine reserves, including increased fish abundance, reduced IUU fishing, and improved conservation. TURFs grant exclusive access to designated areas, promoting local ownership and conservation measures.
Climate change is expected to increase pesticide toxicity in fish, as warmer temperatures become toxic at the upper limit of species' temperature tolerance. The study reveals that pesticides and industrial contaminants become toxic when temperatures reach 50C, making fish more vulnerable to environmental changes.
A new study finds that genetic differences between American eels that feed in freshwater and brackish environments explain their decline. The research identifies 99 genes associated with growth rate, heart development, and smell, highlighting the importance of genetics in determining eel survival.
Research led at the University of Strathclyde suggests that predatory seals are a major obstacle to cod stock recovery in Scottish waters. The study found that grey seal predation has increased to compensate for declining fishing efforts, leading to losses of over 40% of the total stock.
Researchers develop new method to trace salmon migration and habitat use by analyzing ear bones for strontium signatures. This technique may aid conservation efforts for threatened salmon populations facing climate change, industrial development, and overfishing.
Endothermic fish, including sharks and tunas, can swim two and a half times faster and twice as far as cold-blooded species. This unique physiological characteristic allows them to maximize their swimming distance and speed, providing benefits for hunting and reproduction.
A team of researchers has identified the first fossil specimens of a major group of killifishes that is widely distributed in freshwater habitats today. The fossils, which date back to 6 million years ago, provide new insights into the evolution of bony fishes and the diversification of species.
Scientists have devised a new method to investigate factors contributing to biological invasions of non-native species. The study successfully distinguished between two-wave and single-wave invasions using genetic data, allowing for better ecological understanding and management strategies.
Researchers developed a powerful new model to help decision makers choose cost-effective barrier removal projects, doubling habitat accessible to migratory fish. The study found that coordinated efforts across the entire basin are nine times more cost-effective than local or county-level efforts.
A study by University of Wisconsin-Milwaukee researchers found that exposure to metformin causes intersex conditions and stunted growth in male fish. The diabetes medication was detected in freshwater systems worldwide and is being investigated as a potential endocrine disruptor.
Researchers have identified a second possible specimen of the rare 'pocket shark,' measuring just 5.5 inches long, with distinct physiological features and an unhealed umbilical scar.
Research predicts that warming seas will constrain fish habitats, leading to reduced abundance of commercial species. The study used a model combining fisheries datasets and climate projections to predict future distributions of UK favourite fish.
Scientists discovered that Lake Erie's dead zones are variable and move erratically, affecting fish distributions and catch rates. Fish like yellow perch cluster at the edges of these areas, making it essential to determine effective fishing strategies.
A global study found that nearly 83% of fished coral reefs have lost more than half their fish biomass, highlighting the need for effective management and conservation strategies. Marine reserves can recover fish populations in approximately 35 years, while heavily depleted reefs take around 60 years to recover.
A study published in Current Biology reveals that the dusky dottyback, a small predatory fish found on coral reefs, changes its color to mimic other fish species to hunt juvenile offspring. This clever strategy also helps the fish avoid detection by predators.
The EU's new Common Fisheries Policy aims to reduce waste and improve fish stocks, but a University of Strathclyde study suggests it may be difficult for the industry to comply. The study found that while overall catches have decreased, the proportion of catch discarded has increased due to an increase in small fish being caught.
By channeling food to large individuals, fish biomass doubles, highlighting the importance of size-dependent efficiency in population growth. This study has significant implications for fisheries management and predator-prey interactions.
A recent study by the University of Connecticut explores the potential of important fish species to adapt to a more acidic ocean due to climate change. The researchers found that related fish had similar lifespans, suggesting a significant genetic component to survival in an acidic environment.
A new study reveals that female killifish avoid mating with males of closely related species and also tend to shun males of their own species if they come from an unfamiliar population. This phenomenon, called cascade reinforcement, can lead to the early stages of speciation.