Articles tagged with Ichthyology
A long-term study in the Seychelles found that repeat coral bleaching caused lasting changes to fish communities, with large predator fish declining and being replaced by seaweed-loving fish. The study suggests that under current levels of ocean warming, permanent changes to reef fishes are likely on most coral reefs globally.
Researchers found that cardinalfish, thought to be monogamous, engage in complex mating behaviors including infidelity and cannibalism. The study suggests that males can offset the energy costs of brooding eggs by eating them or accepting eggs from other females.
A new study published in Science has found that tiny, mostly bottom-dwelling creatures called cryptobenthic reef fishes perform a critical role on coral reefs. These small fish supply almost 60% of the consumed fish food by constantly replenishing their populations.
A new study found that extreme draining of Fall Creek Reservoir in Oregon aided juvenile chinook salmon downstream migration and led to the elimination of invasive largemouth bass and crappie. The reservoir's natural river-like conditions promoted a native species-dominated ecosystem.
A new study found that large fish fences in tropical seas are causing extensive damage to habitats, including seagrass meadows, mangroves, and coral reefs. The research revealed that these fisheries catch over 500 species, many of which are babies or conservation concerns.
The study found that replacing red and processed meat with fish in the Danish diet can lead to a significant health benefit, particularly for men over 50 and women of childbearing age. The greatest effect is seen when consuming fatty fish, as it contains healthy fatty acids and vitamin D.
A study of ancient fish ponds in Bolivia's seasonal drylands reveals intentional maintenance of fish habitats for food. The discovery supports a permanent human settlement, using ponds to store water and harvest fish year-round.
Researchers discovered a previously unknown visual system allowing color vision in fish living beyond sunlight's reach. Fish such as the silver spinyfin possess multiple rod opsins, sensitive to different wavelengths, potentially used for detecting specific prey species through bioluminescent cues.
A new species of fish parasite, Elthusa xena, has been discovered in South Africa, adding to the genus' diversity. The female parasites were named after Xena due to their tough appearance and egg-carrying abilities.
A new study by Duke University scientists reveals that tropical and subtropical fish are taking up residence on shipwrecks and other sunken structures off the North Carolina coast. The artificial reefs created by these structures serve as stepping stones for fish moving northward in search of suitable habitat.
Researchers discovered that reef fish rely heavily on food from the open ocean, with some species relying on more than 400 grams of plankton per kilogram of fish produced. The study found that areas of the reef exposed to the open ocean produce the largest quantities of fish, offering hope for resilient reefs.
A new study provides fresh insights into the development of the Coelacanth skull and brain, revealing a unique 'intracranial joint' that allows the fish to survive despite its small brain size. The research also sheds light on the evolution of vertebrate species, including humans.
Researchers used X-ray Reconstruction of Moving Morphology (XROMM) to track catfish catching and swallowing prey, revealing coordinated movements of bones and muscles. The findings suggest that different tasks require varying levels of coordination.
Researchers studied how fish adapt to rapid changes in freshwater environments and found they can react quickly when alone or in groups. The study's findings suggest that fish use cues from obstacles to find energetically-beneficial places in the flow.
A recent study by Professor Andreas Lopata found that consuming certain types of n-3 fatty acids from marine oils can decrease asthma risk by up to 62%, while high n-6 consumption increases risk by up to 67%. This research suggests a potential link between fish consumption and reduced asthma severity.
A new study published in Frontiers in Physiology found that farmed Atlantic salmon's respiratory systems function normally even when carrying large loads of the piscine orthoreovirus. The research, conducted at the University of British Columbia, suggests that infected fish do not experience significant harm to their physiology.
A new study by Bigelow Laboratory for Ocean Sciences reveals that a diverse portfolio of herbivore fish species is equally important to keeping reefs well grazed and hospitable to baby corals. This finding has significant implications for the management of tropical fisheries.
A new study found that marine wildlife near coral reefs respond differently to climate change events depending on their distance from the mainland. Surveys of fish and coral habitats showed an increase in herbivorous species in middle- and outer-shelf reefs after severe environmental disturbances, but not near the coast.
Researchers found that zebra stripes deter flies from landing due to visual disruption and twitching behavior. Zebras swish their tails constantly and run away if flies are persistent, whereas horses primarily twitch and swish to ward off flies, allowing them to be dislodged.
A recent study by Forschungsverbund Berlin found that fish with a high level of familiarity are more aggressive towards each other. The researchers used the Amazon molly, a naturally clonal fish species, to isolate the effects of familiarity on behavior.
A recent study by University of Guelph researchers found a 32% seafood mislabelling rate, with the problem persisting throughout the supply chain. The mislabelling rate was highest at retailers, indicating the role of distribution and repackaging in the issue.
Researchers found that variations in a single gene led to changes in phosphorus release and calcium uptake in fish, potentially triggering ecosystem-wide effects. The study suggests a link between genetic variation and ecological implications, highlighting the importance of understanding how species adapt to their environments.
Researchers used scavenger study to find evidence of wildlife diversity in Chernobyl Exclusion Zone. The team observed 10 mammal and five bird species using fish carcasses as bait.
Researchers found that 'cuckolder' males and the mother's social partner were more related than expected by chance. This phenomenon allows for inclusive fitness benefits to mitigate costs of cuckoldry, where closely related males work together to compete against host males.
A study by ARC Centre of Excellence for Coral Reef Studies found fish respond faster to simulated predator attacks in turbid water, indicating increased anxiety. This effect may stunt growth and damage health due to reduced visibility affecting energy allocation.
A new study from Lund University investigates the degradation of plastic waste, finding that it can break down into nanoplastics under mechanical stress. The researchers warn that this could lead to adverse consequences for animals and humans, as nanoplastic particles are extremely small and can be ingested by living organisms.
A comprehensive study of the blind cavefish's vertebrate-like pelvic girdle and phylogeny may provide insights into the evolution of appendages, pelvis, and vertebral column needed for terrestrial life. Researchers will examine the morphological, genomic, and mechanical qualities that enable fish to walk on land.
A new study reveals that coral reef fish species at the extremes of the food chain, such as strict herbivores or predators, evolve faster than those in the middle with varied diets. This finding has valuable conservation implications for managing fisheries exploitation and preserving functional diversity on coral reefs.
A new study from Stockholm University shows that seal predation on fish does not significantly decrease cod, herring, and sprat populations in the Baltic Sea. Climate change, nutrient load, and fisheries have a greater impact on commercial fish stocks, but excessive seal numbers could still harm fish in extreme scenarios.
Researchers developed a new length-based risk assessment method to evaluate the sustainability status of popular reef fish species. The study found that only one species had a sustainable risk score, while others had estimated risks of over 95 percent.
Researchers mapped the regions of the brain in electric fish, finding that the cerebellum is bigger than expected and associated with their use of weak electric discharges. The study challenges the idea that big brains always mean big cerebellums, suggesting alternative explanations for brain evolution
Researchers have identified a shift in fishing behaviors on Indonesian islands Alor and Timor around 7,000 years ago, likely due to changes in sea levels and environmental conditions. The study used an analysis method traditionally used in biology to identify fish habitat in archaeological material.
A 30-year study found that warming waters caused rapid shifts in connected marine ecosystems, with smaller fish moving northward and entire communities inverting. The research suggests that future warming events could have major impacts on marine ecosystems and fisheries.
Researchers found that the Yangtze dams have reduced the distance of Chinese sturgeon migration by 1,175 kilometers, leading to delayed maturity and a decline in breeding activity. The environmental capacity of the spawning ground has also been reduced, contributing to the ongoing decline of the species.
The atlas uses state-of-the-art data and cartography to visualize the finely choreographed movements of migratory big-game species. The maps reveal how animals have perfectly tuned their movements to landscapes and seasons, highlighting the challenges faced by conservation efforts.
Researchers found that more aggressive farmerfish groups, which defend their territories from intruders, resided near branching corals and provided better protection. Additionally, corals planted in the territories of aggressive fish suffered less damage than those in non-aggressive groups.
A study by University of California - Riverside researchers found that mouth injuries caused by hook removal after catch-and-release fishing reduce feeding performance in suction-feeding fish, including bass, salmon, and trout. The study suggests that fishing-induced injuries impact a fish's ability to feed while the mouth is healing.
A new study shows that land-locked Atlantic salmon use the Earth's magnetic field as a navigational tool, similar to Pacific salmon. The ability is retained even after several generations of fish in a land-locked lake. This raises concerns about the impact on native salmon and ecosystems if these fish escape aquaculture pens.
Exposure to artificial light at night increases fish's willingness to take risks, emerging quicker from hiding places and swimming in riskier areas. However, it does not affect their social behavior or swimming speed.
Researchers found that zebrafish with specific personalities outperformed those based on coloration patterns in terms of reproductive parameters. The study suggests that pairing animals by personality can boost fitness and inform conservation efforts.
A new study highlights the urgent need for nations to tackle both climate change and sustainable fisheries management. By adopting effective management practices and limiting global warming to 2 degrees Celsius, significant increases in food, fish, and economic activity are possible.
A new study by Umea University researchers found that browning in lakes has a limited impact on fish populations, affecting only lakes with average depths of 2-3.5 meters. This suggests that the expected decline in fish populations due to browning is less severe than previously thought
Researchers found that African killifish can mature and reproduce in as little as two weeks, setting a new record for the fastest maturation rate in vertebrates. The fish's lifespan is also highly flexible, with some individuals reaching sexual maturity in up to 10 weeks.
A recent study by Anna Neuheimer and colleagues found that adult fish adjust their spawning time to match the timing of their prey, allowing their offspring to survive. This adaptation is crucial for population size and future fisheries catch, as it enables young fish to meet their food needs in a seasonal environment.
Professor Martin Grosell received the Award of Excellence in fish physiology from the American Fisheries Society for his groundbreaking research on the effects of oil on marine fish. He is also a renowned expert in environmental physiology and toxicology, with over 200 peer-reviewed publications.
Research shows that Kodiak brown bears can consume up to 2 tons of fish in one summer by syncing their stream-to-stream movements with salmon spawning patterns. This study links actual bear consumption to their foraging behavior and movements, highlighting the importance of diverse salmon populations.
A recent study reveals that the fastest rates of species formation occur at high latitudes and in cold ocean waters, contradicting the long-held assumption that tropical environments are evolutionary hot spots. The research found that cool-water and polar ocean fishes formed new species twice as fast as average tropical fish.
Scientists have discovered that fish use brief electrical pulses to communicate without being detected by predators. This adaptation may hold clues for treatments of conditions such as epilepsy and cardiac diseases. The research also provides insights into the genetic basis of unique abilities in animals.
A team of evolutionary biologists discovered that tapeworms increase the tendency of three-spined sticklebacks to venture into open waters and exhibit risk-friendly behavior. Healthy fish in groups with infected members imitate their changed behavior, while infected fish do not take cues from cautious behavior in healthy fish.
A new study reveals how cleaner shrimp partner with would-be predators by waving their antennae and using color changes to convey a willingness to clean. This exchange is based on truth in advertising, with both parties benefiting from the interaction.
A new UBC study found that 70 of 281 seafood samples were mislabelled, with restaurants having the highest rate. The most commonly mislabelled fish was snapper, often replaced by less valuable species like tilapia.
A study using household surveys estimated that 9.26 million metric tons of wild-caught freshwater fish were consumed in low-income and middle-income countries, compared to the reported 5.6 metric tons. This represents a significant underreporting of global freshwater fish catches, with potential implications for food security and susta...
A Rutgers-led study found that new fisheries are likely to appear in over 70 countries due to climate change, sparking conflict among nations. The movement of fish species is disrupting fisheries, leading to overfishing and reducing food, profit, and employment for many.
A recent study found that climate change is causing fish species to migrate across national boundaries, leading to new conflicts over fisheries resources. The researchers suggest implementing flexible arrangements for trading fishing permits or quotas across international borders to avoid these disputes.
Researchers found guppies rapidly turn their eyes black to warn rivals, making their eyes more conspicuous as an honest signal of aggression. This behavior is seen in larger guppies dominating smaller ones, but not the other way around.
Researchers use LiDAR to locate invasive lake trout and identify spawning areas, offering a faster and more efficient way to manage the lake's ecosystem. The low-cost instrument can cover large areas of the lake, reducing labor costs and environmental impact.
A new study reveals that bigger female fish produce significantly more offspring than smaller ones, with a scaling pattern where larger mothers produce exponentially more eggs. This finding has implications for fisheries management and suggests that larger fish are crucial for replenishing marine populations.
A study by Université de Montréal researchers found that 38% of countries' populations are exposed to methylmercury levels higher than safe for foetal development, with high-risk areas including the Maldives and South Korea. Industrial fishing has increased mercury exposure, especially in coastal and island nations.
Researchers found that reef fish inherit epigenetic changes from their parents, enabling them to cope with warmer ocean temperatures. This adaptation may provide a buffer against the impacts of climate change and allow for genetic adaptation over time.
A recent study found significant differences in nutrient levels and species composition between Devils Hole and a constructed scale replica at the Ash Meadows Fish Conservation Facility. The findings suggest that modifications to the refuge's operation could improve the prospects for continued survival of the critically endangered Devi...