Articles tagged with Fish
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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.
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.
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 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 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.
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.
Researchers found that bigmouth sleepers adapt by changing their behaviors, sex ratio, and physical appearance to survive on insects, snails, and crustaceans when isolated from their normal prey. The study suggests that evolution may be occurring in a predictable way, with the ability to anticipate ecological changes.
Scientists at USF have developed a handheld sensor that can debunk fraudulent seafood species claims, helping ensure consumers get what they pay for. The QuadPyre RT-NASBA technology is accurate enough to detect grouper substitution on cooked fish at the point of restaurant service.
A University of Bristol undergraduate has uncovered the feeding habits of an ancient fish, Dapedium, which was well-adapted to crush shells. The study reveals that Dapedium's jaws moved slowly but strongly to work on hard-shelled prey, similar to modern sea breams.
China's enormous aquaculture sector is under scrutiny for its impact on global seafood supplies. The Stanford-led study suggests a more sustainable alternative using processing waste to reduce pressure on wild fisheries.
A team of scientists has identified the nature of fish's 'sixth sense', which allows them to detect flows of water. The research found that a unique layout of flow sensors on the surface of fish is nearly universal across species, enabling them to retrieve signals about water flow and use this information in different behaviors.
A new model developed by Penn State researchers can accurately identify stream sections suitable for wild brook trout, helping fisheries managers protect habitat. The model uses characteristics like water temperature and soil type to predict brook trout occurrence in the eastern United States.
A new study reveals that Dolly Varden, a char species in southeast Alaska, have successfully adjusted their migrations to follow the timing of salmon spawning, ensuring access to a key food source. This adaptability suggests that at least some species may be more resilient to climate-induced changes in migration timing.
A three-year restoration project in Pittsburgh's Frick Park has improved the health of Nine Mile Run, a stream affected by urbanization. The project, led by University of Pittsburgh hydrologist Dan Bain, involved rerouting the creek and creating habitats for fish and other species.
A new trout species, Salmo kottelati, has been described from the Alakır Stream in Antalya, Turkey. The species is distinguished by its smaller parr marks, larger mouth gape, and maxilla, which set it apart from other genera of salmonids.
Naturally spawned juvenile sockeye are migrating to the ocean and returning as adults at a much higher rate than others released from hatcheries. The analysis indicates that the program to save the species has succeeded in rebuilding populations in the wild, with the species regaining fitness.
Biologists believe the increased return rate of naturally spawned sockeye is high enough for the species to eventually sustain itself in the wild. Naturally spawned fish are returning at rates up to three times higher than those released from hatcheries.
Leading coral reef scientists argue that a shift away from extinction threat is needed to protect marine ecosystems. Researchers found no relationship between species abundance and geographic range, highlighting the weaknesses in current approaches to assessing extinction risk.
A study from North Carolina State University reveals that human-induced habitat alteration leads to changes in the shape and size of male mosquitofish genitalia, particularly in fragmented waters. The research suggests that these changes may be driven by reduced predation pressure, which can influence reproductive success.
The November issue of Frontiers in Ecology and Environment presents research on connectivity cost calculations for conservation corridors, agricultural companions that improve yields, and the consequences of growing jellyfish populations for human well-being.
Researchers call for networks of marine protected areas, co-ordinated governance, and local community involvement to tackle overfishing and habitat destruction. Small-scale fisheries, which involve 90% of the world's fishers, are a major threat, with destructive practices like bottom trawling causing widespread damage.
A study identified 181 California dams that may need increased water flows to protect native fish, with the top priority dams including Trinity Dam and New Melones Dam. The new tool provides a scientific basis for dam operators to prioritize management and reduce the risk of extinction for many native species.
Researchers at the University of Tennessee discovered that certain species of cichlid fish exhibit playful behavior, such as attacking a thermometer. This finding suggests that play is not unique to humans and may be an essential part of animal biology.
Researchers studying blind cave fish are uncovering insights into degenerative eye disease and sleep disturbance. The species' genome sequence reveals similarities with the human genome, suggesting potential avenues for understanding human diseases.
A study by researchers at the University of York found that domestic fish supplies have fallen to their lowest point in over 70 years, with only one fifth of recommended consumption levels met. The report also highlights the environmental costs of aquaculture and calls for sustainable production methods.
A new study suggests that electrofishing can effectively remove non-native Brook Trout from small Rocky Mountain streams, preserving native Westslope Cutthroat Trout populations. The method involves using electrical shock to target and remove specific unwanted species, reducing impacts on native fish and macro-invertebrates.
A study by University of South Carolina researchers found that natural processes can cause dramatic year-to-year drops in fish populations. The team used tree rings to extrapolate back in time nearly 600 years and found that low winter upwelling, which favors fish growth, has increased recently, sparking concerns about climate change.
Two tropical rabbitfish species are destroying algal forests in eastern Mediterranean, reducing large seaweeds and algae by 65% and 60%. Climate change is enabling their expansion, posing a threat to entire Mediterranean basin.