Articles tagged with Fish
A study by University of Jyväskylä and Luke found that enriched rearing significantly enhances the survival of fish from bacterial infection in aquaculture. The results may advance natural disease prevention methods in aquaculture, improving post-release survival after stocking into the wild.
Researchers observe thousands of flashlight fish synchronizing their movement and facilitating schooling behavior in complete darkness. This study reveals a novel function for bioluminescence in the ocean, showing that fishes can school using only their natural light, without relying on ambient light.
The study found that less than 5% of schooling fish needed to be flashing to maintain the group in dark conditions. Flashing may serve as a predator-avoidance strategy, with some fish flashing then rapidly changing direction before flashing again.
The study confirms the importance of fish larvae produced in no-take zones for the health of fish populations within nearby fishing zones. The accuracy of the model was tested with field data, validating its predictions and providing valuable insights for reef managers.
Researchers at Oregon State University have developed a novel genomics-based method to detect the simultaneous presence of hundreds of organisms in a stream. The study used water sampling for environmental DNA, capturing biodiversity and ecosystem health data from hundreds of organisms in a single sample.
A study led by Dr Chancey MacDonald found that fussy fish can survive and even thrive in deeper waters due to their ability to adapt their diets. The Triangle Butterflyfish, a dietary specialist, fed more selectively on preferred corals, while the Eight-Band Butterflyfish, a generalist, became more flexible in their diet with depth.
A team of scientists has discovered a new species of fairy wrasse in the mesophotic coral reefs off the coast of Tanzania, dubbed the 'Vibranium Fairy Wrasse' due to its purple scales. The discovery sheds light on the unique ecosystems of the twilight zone, which are just as vulnerable to human threats as shallow reefs.
A University of Otago-led study has discovered the genetic mechanisms behind sex change in fish, revealing a complete rewiring of the gonad and changes in cellular memory. The research has implications for understanding human sex development and potential applications in tissue engineering and aquaculture.
Researchers discovered that specific genes are turned off and on in the brain and gonad to facilitate sex change, a process linked to cellular memory and epigenetic reprogramming. The study sheds light on how environmental factors influence gene expression in animals, including humans.
A UC Santa Cruz study found that many college students are unaware of the mercury exposure risks associated with eating large amounts of tuna. Students reported consuming up to 20 servings of tuna per week, exceeding recommended levels and potentially causing neurological damage.
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 are developing robotic fish surrogates to assess the fish-friendliness of hydroelectric power plants. The RETERO project aims to reduce and eventually eliminate live fish tests, which result in high mortality rates for fish traveling through turbines.
Researchers at Penn State are embarking on a four-year effort to restore the endangered Chesapeake logperch to its original habitat in the Susquehanna River. The group, led by Jay Stauffer, has secured $500,000 in funding and is using innovative techniques such as underwater drones and culturing to introduce the fish back into the wild.
A pioneering artificial reef project has been launched in Sydney Harbour, aimed at increasing local marine biodiversity and supporting native species. The reef, featuring modular pods with 3D printed design elements, is already attracting interest from fish species such as leatherjackets and bream.
A multinational research team developed an innovative application of electronic fish-finders to predict the mix of sizes and species in tuna aggregations. This technique uses acoustic signatures, which vary by species, to distinguish between sustainable skipjack tuna and other species like yellowfin and bigeye.
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.
Climate change is speeding up Alaska sockeye salmon's growth rate in freshwater, causing them to migrate to the ocean faster. However, this shift may not benefit the species long-term, as it takes an extra year at sea, where they face increased competition with hatchery-raised salmon.
Researchers discovered that tiny fish living in the gaps of coral reefs play a crucial role in sustaining the ecosystem. These 'cryptobenthics,' which include species like gobies and blennies, reproduce rapidly and are consumed by other animals, providing a vital food supply for larger species.
Researchers at Simon Fraser University discovered that tiny fish species around the world are a crucial food source for larger fishes on coral reefs. These 'cryptobenthic' fishes dominate larval communities near reefs and create a steady stream of babies that rapidly replaces each adult fish devoured on the reef.
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.
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.
New research reveals that lionfish populations on mesophotic reefs are affected by prey abundance and water temperature. Higher densities of lionfish were found at sites with lower bottom temperatures, suggesting cold-water upwelling currents fuel the food chain in these areas.
Researchers discovered that deep-sea fish can see color in the dark by examining the genomes of 101 species. This ability may have evolved as a survival weapon to quickly detect predators or prey in low-light conditions.
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 recent study led by IGB demonstrates complex learning behaviour in Atlantic sturgeons. The fish trained to search for food in a sandy environment showed improved feeding behavior and increased formation of the transcription factor neurod1 in their brains.
A species of fish in Texas' Houston Ship Channel adapted to extreme pollution due to its large population, good genes, and luck. The Gulf killifish benefited from genetic resources from a long-distant relative, the Atlantic Coast killifish, which helped it develop resilience and resistance to toxins.
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.
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.
A mathematical model shows that sacrificing a few offspring can lead to increased total offspring survival, especially in overcrowded environments. This suggests that filial cannibalism and offspring abandonment might be considered forms of parental care.
Researchers found commercially available fish preparations for skin prick testing varied greatly in allergen content, leading to false negative results and potential life-threatening consequences. The team is working on advanced diagnostics and therapy for seafood allergy.
A team of scientists from Australia has shown that providing woody habitat in the Murray River significantly increases native fish populations. The study found a three-fold increase in Murray cod and doubling of golden perch abundance in restored areas compared to constant habitats.
Researchers have found that invasive round gobies in French Creek are consuming native freshwater mussels, posing a significant threat to their survival. The study's findings highlight the potential ecological disaster if gobies continue to spread in the watershed.
Researchers found that species with high adaptability tend to have longer lifespans, as they can better cope with environmental changes. The study also discovered that reversible phenotypic plasticity, where individuals can switch between different traits, is key to survival in changing environments.
Research on guppy fish reveals that genes in males are preserved over generations, allowing the evolution of bright colors. This genetic stability enables the conservation of characteristic traits, such as coloration, in males.
A University of Guelph study found that warmer temperatures are causing fish to forage in deeper water, leading to a climate-induced reorganization of food webs. The research tracked lake trout movement and feeding habits across hundreds of lakes in northwestern Ontario.
Researchers found that natural selection can couple genes for color pattern and mate preferences when species still interbreed. The study identified four narrow regions of the genome that are highly differentiated among species in hamlets, closely related reef fishes that differ in terms of color pattern.
A team led by Dr. Adriana López-Arbarello identifies three new species of the genus Eosemionotus, a type of ancient ray-finned fish, found in the Swiss Alps. The discovery provides insights into the rapid diversification of life after a mass extinction event.
A recent study found that climate change is disrupting the complex systems underlying global fisheries, with 8% of fish populations experiencing significant negative impacts. The greatest losses in productivity were seen in regions such as the Sea of Japan and North Sea, while the Labrador-Newfoundland region saw significant gains.
Researchers found that icefish have evolved transparent blood, increased energy production, and specialized proteins to protect against cold damage. These adaptations enable them to thrive in Antarctica's frigid waters.
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.
Climate change is causing fishing communities to adapt by changing their fishing locations and strategies. Large North Carolina-based trawl vessels are now sailing 250 miles north to catch summer flounder and Atlantic croaker off the coast of New Jersey.
Scientists have developed a methodology to assess fish stocks by combining modern underwater surveys with historical records dating back to the 8th Century AD. The analysis found that some previously classified as
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.
Six new species of Ancistrus catfish with unique features such as tentacles and armor-like plates have been discovered in the Amazon rainforest. The findings highlight the need for conservation efforts to protect these creatures and their habitats from threats like habitat destruction, deforestation, and gold mining.
A new study found that warmer water temperatures combined with low-level chemical exposure influence the expression of genes in the offspring of a North American fish species. The finding threatens organisms sensitive to water temperature and highlights the need for reevaluating regulatory decisions based on short-term testing.
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 have solved a decades-long riddle about Australia's threatened Lungfish species by discovering its unique life span of up to 80 years. By analyzing Carbon 14 levels in scales, the team was able to determine the age of individual fish and debunk concerns about an ageing population.
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 University of Delaware researchers reveals that larger-bodied fish, like juveniles, associate with anemones for protection, while smaller species partner with them throughout their lives. This mutualistic relationship is driven by predation and helps fish avoid predators in ocean reefs.
Researchers have shown that fish otoliths record information on fish metabolism, providing a unique window into how species adapt to changing conditions. By analyzing the carbon isotopes in otoliths, scientists can infer the fish's activity level and metabolic rate, offering new insights into climate change impacts.
Researchers used augmented reality to investigate the link between active sensing movement and sensory feedback in weakly electric fish. The study found that subtle active sensing movements are controlled by sensory feedback, enhancing sensory information reception. This discovery may have implications for neuroscience and robotics.
Researchers are conducting a comprehensive study of the walking cavefish to better understand the 'fin-to-limb' transition that enabled the first vertebrates to walk on land. The project aims to identify the genomic, morphological and mechanical qualities that enable fish to walk on land.
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.
Researchers found the Conchos shiner in the mainstream of the Rio Grande at a site previously thought to be free from non-native species. The discovery highlights the need for further research and conservation efforts in the Rio Grande drainage system.
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.
Scientists have observed a previously unrecognized swarming behavior in Spironucleus vortens, a single-celled parasite infecting ornamental fish. The swarm exhibits highly coordinated movement, suggesting interactions between the flagellates, which may contribute to its life cycle and lead to novel treatments.
The California Academy of Sciences has added 229 new plant and animal species to the family tree, including 120 wasps, 34 sea slugs, and seven flowering plants. These discoveries were made over five continents and three oceans, highlighting the vast and dynamic planet's unexplored places.
Researchers at the University of Konstanz have found a novel genomic mechanism for sex determination in swordtail fish, resulting from decades-long hybridisation experiments. The study reveals that introgression and selection of pigmentation phenotypes contribute to the rapid evolution of a new sex chromosome.
The study warns that a temperature increase of over 1.5°C will cause dramatic worsening in the survival chances of offspring for important fish species, including Atlantic cod and polar cod. This could lead to a significant loss of breeding grounds and population decline, with severe consequences for Arctic seals and seabirds.
Researchers discovered a mechanism explaining positive correlations in natural populations, highlighting the importance of food web conservation. Complex food webs mitigate environmental variability and make ecosystems more predictable.