Articles tagged with Fish
A new analysis shows that Southern Resident killer whales prey on a variety of fish species throughout the year, including Chinook, steelhead, chum, and coho salmon. The researchers found that the whales' diet becomes less diverse during lean times, highlighting the need for strategies to support their food supply.
The Khaled bin Sultan Living Oceans Foundation's Global Reef Expedition found the Chagos Archipelago to be home to some of the most diverse coral reefs in the Indian Ocean. Despite being relatively undisturbed, human impacts were evident, and mass bleaching caused widespread coral mortality.
Researchers detail nine steps for cell-based seafood to deliver environmental benefits, including developing a viable product and driving down demand for wild-caught seafood. However, achieving conservation outcomes is a complex process with many hurdles, including getting consumers to adopt the new product.
A global biological assessment of rivers reveals a striking loss of biodiversity in Japan and New Zealand over the past 20-30 years. Poor living conditions for fish and macroinvertebrates are also widespread across Europe, North America, Australia, and South Korea.
A new study reveals a unique link between the diet and distribution of coral reef fishes, highlighting planktivores as potentially vulnerable to environmental change. The Indo-Australian Archipelago is a global marine biodiversity hotspot, where planktivorous fish species are more diverse than others.
Researchers found significant distribution disparities in coral reef fish species across trophic groups, with a disproportionate number of planktivores in the IAA. Planktivore species richness was highest near Indonesia and the Solomon Islands, but declined sharply outside the region.
Researchers found that prolonged algal blooms lead to larger fish catches, particularly for sardines and squid, in the Red Sea. The study used satellite images to analyze phytoplankton bloom timings and their effect on marine food webs.
Research at Kobe University Graduate School of Science found that captive-bred juvenile red-spotted masu salmon rarely become migratory when released into natural streams. This discovery has implications for conservation and management of salmon species, highlighting the need for reevaluation of stocking practices and river environments.
Researchers have discovered that non-teleost ray-finned fishes possess genetic traits similar to those of lobe- and ray-finned fishes, including limb development and respiratory systems. These findings provide crucial insights into the water-to-land transition during vertebrate evolution.
A recent genome mapping study by the University of Copenhagen found that our common fish ancestor, which lived 50 million years ago, already carried genetic codes for limb-like forms and air breathing. This discovery challenges the long-held belief that limbs and lungs evolved separately during the vertebrate transition from water to l...
Researchers found that juvenile fish in the North Sea and West of Scotland are getting bigger, while adult fish are getting smaller due to rising sea temperatures. This change in body size may impact commercial fisheries yields and marine ecosystems, particularly those with predator-prey relationships.
A study predicts that different species of coral reef fishes will respond variably to climate change, with some exhibiting rapid responses and others being more vulnerable. The research identified seven parameters that may serve as biomarkers for evaluating the impact of elevated temperatures on these fish.
Researchers found eDNA sampling to be more accurate than electrofishing in detecting coastal cutthroat trout populations, revealing fish up to 250 meters upstream. EDNA detection is a useful complement to electrofishing but not a replacement, offering less disruption and fewer permits required.
FishChoice guides consumers to maximise nutrient intake while minimising exposure to chemical pollutants, promoting sustainable seafood consumption. The new version provides advice in the form of a traffic light to help users choose safe and sustainable seafood options.
A new model developed by researchers at McGill University predicts that warming waters will reduce the ability of large fish to extract oxygen from their environment, impairing their physiological performance. The study's findings suggest that global warming could limit the aerobic capacity of fish worldwide.
In a groundbreaking discovery, scientists have found electric eels working together to herd small fish into tightly packed balls. The eels then launch simultaneous electric attacks, stunning the prey into submission.
Rutgers-led research found coral reef fish larvae dispersal varies significantly over time and seasonally. This variability affects population estimates and conservation strategies, highlighting the need for more nuanced studies on dispersal patterns.
A new study published in Nature Sustainability found that more management measures employed in fisheries lead to better outcomes for fish populations. The research team analyzed data from nearly 300 fish populations and confirmed that increased management attention is linked to healthier fisheries.
The decline of freshwater mussels in Japan has heightened hybridization between native and introduced bitterling fish species, threatening the native population. The loss of host mussels increases competition for breeding substrates, leading to a cascade of extinctions.
A Rutgers study found that two-fifths of commercial fishermen did not fish earlier this year due to market disruptions, while nearly all reported a decline in income compared to previous years. Some species, like squid and scallops, saw decreased catch, while others, such as black sea bass and haddock, maintained or increased their catch.
Researchers discovered that electric fish use specialized long-distance electric signals to communicate with each other, similar to AM radio, allowing them to navigate and interact in absolute darkness. The cave-adapted fish have greater electric field strengths than surface-dwelling relatives.
A new study finds that roly polies and other terrestrial bugs are transferring high levels of mercury to steelhead trout, a threatened species in coastal California. The research confirms earlier findings that mercury can accumulate in the top of the food chain in coastal ecosystems.
An 81-year-old midnight snapper caught off the coast of Western Australia has become the oldest recorded tropical reef fish, surpassing the previous record by two decades. The study found that long-lived fish are generally considered vulnerable to fishing pressure, highlighting the need for sustainable management of commercial fisheries.
A research team from the University of Basel investigated the explosive speciation of cichlid fishes in Lake Tanganyika, discovering three discrete pulse-like stages of rapid morphological evolution. The study also revealed that the most species-rich lineages contain genetically diverse species.
Scientists have discovered an extremely rare species of cymothoid, Elthusa splendida, from a museum shark specimen in the East China Sea. The find expands the species' range to almost opposite sides of the globe, with only five previously documented specimens.
A new genus of chimaerid fish has been classified with the help of a Kazan University expert. The research provides significant insights into the late Paleogene chimaerid fauna in the Pacific Ocean.
A new study demonstrates the effectiveness of eDNA metabarcoding for detecting deep-sea fish, revealing 11 fish families, 11 genera, and 8 species. This method provides broader coverage of fish diversity and uses significantly less logistical effort than conventional methods.
A large-scale study found Congolese fishermen face declining fish stocks, poor safety conditions, and lack of enforcement, prompting calls for improved regulations and security measures. The researchers conducted 1018 interviews with stakeholders, revealing the need for adapted fisheries management to ensure sustainability.
Researchers found that cavefish exhibit reduced response probability, slower latency, and altered kinematics compared to surface fish. The study provides insight into the evolution of escape behaviors in Mexican cavefish and highlights the importance of ecological differences in shaping neural circuits.
Researchers found a single small gene region influences Chinook salmon migratory timing, contradicting previous assumptions of complex genetics. This discovery may facilitate conservation efforts by clarifying the genetic basis of ecotypes.
A study of young cichlid species in Nicaraguan crater lakes found that new species can arise within a few hundred years through the involvement of many genes. This contradicts previous theories suggesting that speciation is a slow process driven by simple genetic changes.
Expanding marine protected areas (MPAs) by 5% can increase global fish catch by up to 20%, according to a study. The model revealed substantial spillover effects, resulting in an additional 9-12 million metric tons of fish catch annually.
Researchers identify genetic diversity among Neosho and Northern smallmouth bass subspecies, emphasizing importance of origin when stocking streams to avoid 'genetic swamping.' The study's findings could inform fisheries management strategies to preserve native populations and prevent dominant subspecies from outcompeting others.
Scientists from the Khaled bin Sultan Living Oceans Foundation found Palau's coral reefs to have exceptionally high live coral cover, exceeding 45%, and species diversity. However, reef fish communities were found to be lacking, with many big fish missing and signs of overfishing observed on nearshore reefs.
A titan triggerfish was observed catching a Red Sea ghost crab in shallow water without beaching itself. This unique behavior highlights the fish's ability to learn and adapt its feeding strategy.
Research reveals that trapping is ineffective in controlling invasive American signal crayfish in Europe, and may even exacerbate the problem. A novel 'triple drawdown technique' proved significantly more accurate in determining population size.
Researchers recommend a diet rich in sprat, algae, and mollusks as a sustainable alternative to meat. These protein sources emit significantly less CO2 than traditional animal products.
Researchers studied feeding habits of 17 fish species and found that most responded to changing prey abundance by switching to the most abundant prey. However, planktivores and benthivores were less likely to consume more food when invertebrate prey was abundant, suggesting disorientation or confusion may occur.
Research reveals coral reef ecosystems collapse under rapid fishing pressures due to positive feedback between fish behavior and ecosystem sensitivity. The study highlights the importance of understanding the social component of individual fish in managing coral reefs for sustainable harvest levels.
A recent study found that rapid warming events can lead to widespread mortality of coral reef fish. The research examined mass fish kills in the northern Red Sea and Kuwait Bay, revealing a link between rapid warming spikes and increased mortality.
A study found that freshwater turtles, like Emydura macquarii, help clean up fish carcasses and improve water quality by removing toxic ammonia. Turtles accelerated carp decomposition and restored ecosystem balance.
Research reveals dams restrict native fish movement, hindering their response to climate change, while alien species thrive in fragmented habitats. The Ebro River's 300+ dams exacerbate native species loss and alien species gain.
A UC study found that steelhead migration in California's Santa Clara River is triggered by the lengthening daylight of spring, not recent rains. The study recommends limiting water extraction during migration months to allow late migrating fish to return upstream.
Researchers analyzed nearly 30 hillstream loach species using CT scans and DNA analysis to identify three categories of pelvic shapes. The team found that 10 other species shared the cave angel fish's unusually hefty pelvic girdle, suggesting robust pelvic regions evolved independently across the family.
A new study uses next-generation sequencing to analyze genetic diversity of fish eye parasites, revealing complex life cycles and diverse habitats. The research also sheds light on the impact of parasites on fish behavior and immunity.
A 410-million-year-old fossil discovery challenges conventional wisdom on shark evolution, hinting that bone may have emerged before cartilage. The find provides new insights into the evolutionary history of sharks and their relatives.
Researchers have reconstructed the ancestral relationships of the hillstream loach family tree, detailing unusual pelvic adaptations that enable some members to crawl or walk on land. The study found three dominant variations of pelvic anatomy that explain different degrees of land-walking behavior among the fishes.
The study highlights Guadalquivir and Guadiana estuaries as breeding areas due to specific water conditions, including salinity gradient and turbidity. These factors enable high densities of early stages fish and macro-zooplankton, crucial for fish growth.
A new study projects significant changes in fish stocks in the UK due to climate change, including increased abundance of warm-adapted species and declining populations of cold-adapted species. The findings highlight the need for flexible management approaches to adapt to these changes and ensure sustainable fishing practices.
Researchers found that small fish on hot Arabian Gulf reefs are less diverse and abundant than those on cooler reefs, despite similar coral cover. The thermal extremes may be an energetically challenging environment for these smallest marine vertebrates.
Researchers found elevated total mercury concentrations in dragonfly larvae from various national parks, with higher levels in rivers and streams. The study suggests that these insects can be used to predict mercury levels in other species, enabling early warning systems for environmental hazards.
Researchers found that only an extremely small percentage of ingested microplastic particles made it into the fish fillets. The majority were excreted, suggesting that fish can isolate and remove these particles before they penetrate their tissues.
Researchers have discovered that at least 16 species of deep-sea fish have evolved ultra-black skin that absorbs most of the light, allowing them to blend in and avoid detection. The unique shape and arrangement of melanosomes in these fish's skin cells enables this remarkable camouflage.
Researchers used social media network models to analyze fish populations in the Mediterranean Sea, finding that warming seas have significant and widespread effects on biodiversity. The study suggests that winter warming may lead to changes in fish communities, potentially causing some species to disappear from certain areas.
Researchers have identified 32 genes associated with cannibalistic eating behavior in mandarin fish, which feed exclusively on living juvenile fish of their own species. This behavior leads to high mortality rates and economic losses in aquaculture.
Scientists found at least 10 different lineages of fish that have adapted to live in highly toxic environments by tweaking the enzyme to prevent binding, and ramping up an existing detoxification mechanism. This challenges the idea that evolution would lead to different outcomes every time if it were rewound.
A new study by scientists from Martin Luther University Halle-Wittenberg found that microalgae farming has a similar environmental impact to fish production, but produces more omega-3 fatty acids per unit area. This could lead to a more sustainable source of essential nutrients for humans and reduce pressure on the world's oceans.
A recent study found that the Maryland Wind Energy Area, where an offshore wind farm is planned, serves as a crucial migration corridor for Atlantic sturgeon and striped bass. The development of wind turbines in this area could create habitat around which fish linger, potentially disrupting their migrations.
Researchers at Oregon State University found that low levels of endocrine-disrupting chemicals in waterways can alter the DNA structure of fish, passed on through three generations. The study used inland silversides and measured methylation patterns, revealing consistent changes across generations.
A new study reveals that traditional predictions of species movement due to climate change may be inaccurate. Broad diets were found to be a crucial factor in the establishment and persistence of tropical fish in cooler areas.