Articles tagged with Fish
A study by Oregon State University found that hatchery-raised chinook salmon self-sort into surface- and bottom-oriented groups in their tanks, leading to differences in body shape and size. The researchers observed consistent variations from year to year, suggesting genetics plays a role in this behavior.
Paleontologists from University of Alberta discover new species of fish in Colombia with the aid of a curious tourist who spotted a fossil shape in flagstones. The fossil, 90 million years old, is the first 'lizard fish' from Cretaceous period found in tropical South America.
Researchers studied four species of scale-eating fish, finding that each employed distinct strategies to pry scales off prey. The study highlights the diversity of life on Earth and sheds light on the evolution and behavior of these unusual carnivorous grazers.
A recent study led by Harvard University researchers found that coral restoration efforts can have a positive impact on fish communities in the short term and over time. The study showed that even after just one week, significantly more fish and a greater diversity of species were present at experimental coral beds.
Researchers used genetic barcoding to identify and quantify fish larvae in a coral reef ecosystem, revealing species distribution and dispersal patterns. The study solved several mysteries, including the invasion of a puffer fish into the Mediterranean, and provided new insights into the ecology of the reefs.
Researchers at the University of Washington have developed a method to tailor water releases from dams to promote the success of native fish species while controlling invasive non-native species. This approach, known as designer flows, can benefit both humans and freshwater ecosystems in arid regions where water is scarce.
A team of scientists from NOAA Fisheries and California agencies recommend modernizing tracking technologies to improve Sacramento River winter-run Chinook management. The new approach aims to enhance water delivery system monitoring, genetic fingerprinting, and real-time tracking to promote fish recovery.
A study led by Leandro Castello explores the link between deforestation and fisheries yields in the Amazon, finding that lakes with intact floodplain forests provide greater fish yields. The research has implications for managing and conserving the Amazon's fisheries and food security of local populations.
The removal of water from the Colorado River has led to a loss of unique ecological species, which are now at risk of extinction. Hybridization between the native species and those in the surrounding estuaries poses a significant threat to their survival.
A new study finds that variation within species can have significant ecological effects, rivaling those of the entire species. This challenge traditional views on biodiversity and highlights the importance of preserving trait variation within species.
Research reveals that variation within species has significant ecological consequences, often rivaling those of species themselves. The study found that trait differences can affect prey populations and grazing insects, leading to indirect effects on ecosystems.
Researchers have clarified the scientific name of the world's heaviest bony fish, identifying it as a 2,300 kilogram Mola alexandrini bump-head sunfish. The species was previously misclassified as Mola mola, but new study reveals its distinct characteristics.
In cooperatively breeding species, females tend to produce smaller eggs when help with rearing offspring is at hand. This reduction in egg size allows breeding females to conserve energy and increase their chances of survival to the next year or having the next set of offspring sooner.
A new method combining behavioral analyses with computer modeling revealed that individual fish pay attention to one or two neighbors when the school moves together. This finding has important implications for understanding how schooling fish coordinate their movements and could lead to advances in coordinating artificial systems.
Research reveals that fish continuously change which neighbor they pay attention to for seamless collective movement, challenging previous assumptions about coordination strategies. This finding has implications for optimizing and automating complex processes like swarms of drones.
University of Guelph researchers have developed a model that allows fisheries to meet rising consumer demand while ensuring adequate income and replenishment of natural stocks. The model encourages fisheries to reduce short-term harvests to realize higher long-term yields, promoting sustainable fishing practices.
A VIMS study suggests that a common measure of fish health can help gauge the overall health of the Chesapeake Bay. The researchers found that annual trends in fish condition were surprisingly consistent among diverse species, with correlations between condition and changes in water quality, food availability, and climatic factors.
A year-long survey of Red Sea fish larvae found varying stock levels through the seasons, with higher abundance at near-shore sites during colder months. The study also identified differences in community structure, with deeper-adapted species prevalent at offshore sites.
A new WCS study found that coral reef fish diversity depends on maintaining fish biomass above a critical level. The researchers analyzed data from 152 reefs and found that about 65% of the reefs had biomass levels above this threshold.
A Kansas State University researcher has documented that American alligators on the Atlantic and Gulf coasts are consuming small sharks and stingrays, a widespread interaction previously unreported. The study reveals that alligators seek out freshwater habitats with high salinity to prolong their time in saltwater environments.
In a study published in Springer's Behavioral Ecology and Sociobiology, researchers found that male black-finned goodeid fish prefer females with larger bellies and more vibrant colors. These physical traits were associated with higher reproductive value and increased chances of offspring survival.
The study, published in the Journal of Fish and Wildlife Management, compiles data on the Clinch dace from 70 stream segments in Tazewell and Russell counties. The fish can serve as an indicator of water quality due to their rarity and sensitivity to environmental changes.
A new study has documented 289 living invertebrate and fish species arriving from Japan on more than 600 pieces of tsunami debris that crossed the Pacific Ocean. The majority of the debris was manmade material contributing to the transoceanic survival and dispersal of coastal species.
A global analysis of 27,000 vertebrate animal species found that those in the Goldilocks zone face a lower risk of extinction than larger or smaller species. The largest and smallest species are disproportionately threatened by human activities such as harvesting and habitat loss.
Parrotfish rotationally harvest their favorite food, creating pockets of space without turf algae that enable tiny coral larvae to settle and grow. This behavior supports coral reef health by reducing the harmful impact of turf algae.
A recent study explores how infectious hematopoietic necrosis virus (IHNV) spreads among juvenile hatchery-raised fish in the Pacific Northwest. Modeling reveals that returning adults and within-hatchery juvenile-to-juvenile transmission are efficient pathways of IHNV spread.
A new study by an international research team has shown that the levels of cesium isotopes, particularly 134Cs and 137Cs, are generally consistent with background levels from aboveground nuclear testing during the 1940s and 50s. The study suggests that the risks to human health from eating contaminated seafood are likely to be negligible.
Polypterids, known as living fossils, are repositioned on the fish evolutionary tree, shifting their origin and that of modern ray-finned fishes. The study uses CT scans to analyze fossil skulls and DNA sequences, revealing ancient cousins and specializations that evolved later.
Researchers have identified three new species of porcupine fish, expanding our understanding of these unique creatures and their role in ancient ocean ecosystems. The discovery sheds light on the impact of the Isthmus of Panama's formation on tropical biodiversity.
A new protein database developed by scientists can definitively identify fish species, helping to curb seafood fraud worldwide. The database uses mass spectrometry to create unique 'fingerprints' for 54 fish species, including salmon and tuna.
Recent damming has drastically reduced the migration opportunities of fish species, leading to lost habitat and river connectivity issues. The lack of pre-1950 data on ecological harm may underestimate the effects of damming.
The loss of stream habitat in the Great Plains region is changing the fish community, with several species declining or disappearing. The reduction of groundwater sources has led to a transformation of the fish community, shifting from large, free-flowing rivers to small streams with isolated habitats.
Research finds that boat noise affects cleaner fish behavior, leading to increased cheating and decreased cleaning efficiency. This study highlights the need to control man-made noise in protected habitats.
Researchers discovered a massive predatory fish species called Birgeria americana in Nevada's Early Triassic fossils, rewriting the history of apex predators. The find shows that marine ecosystems recovered faster than previously thought, and temperature conditions were suitable for life near the equator.
A new study published in PNAS reveals that urban food demand in the Amazon can impact wildlife as far as 1,000 km away from the city. Researchers found a 50% reduction in fish size and catch rate near Manaus due to overfishing by city-based boats, which also led to larger fish being more common and easier to catch further away.
The article highlights the devastating impact of damming and lost connectivity on anadromous forage fish in northeastern ecosystems. The authors report that these fish exist at only a tiny fraction of their previous populations due to habitat loss and fragmented landscapes.
Researchers found a single amino-acid difference between toothed whales and filter-feeding baleen whales that may explain their distinct body shapes. This variation affects the sensitivity of a key receptor, potentially impacting feeding behavior and body size in these species.
A Kansas State University study found that male and female live-bearing fish evolve at different rates, with males influenced by sexual selection. The researchers analyzed 112 species of live-bearing fish and found that the body shape of males evolves faster than females due to the acceleration of speed of evolution in males.
A new DNA tracking tool allows scientists to catalog invasive and native species in water bodies using environmental DNA. The tool, which uses polymerase chain reaction technology, can collect fish habitat data without capturing fish.
A team of researchers found that decades of groundwater pumping from the Ogallala Aquifer has led to long segments of rivers drying up and collapse of large-stream fishes. The study's findings have implications for watersheds worldwide, as irrigation accounts for 90% of human water use globally.
Two new species of fish, Leporinus enyae and Leporinus villasboasorum, have been named by scientists from the Orinoco River drainage after Irish singer Enya. The discoveries highlight the region's biodiversity and the importance of preserving unique lineages.
Researchers studied ribbon halfbeak flying behavior to optimize 'tandem wing' airplane design. These fish twist their bodies to create horizontal tail wings, reducing downwash effect on main wing.
Despite massive climate change and volcanic eruptions, larger fish were no more likely to go extinct than small fish during the Permian-Triassic mass extinction. The study used a detailed analysis of fossil records to conclude that body size played no role in determining which species survived or went extinct.
A team of marine scientists developed an inexpensive yet accurate method to estimate the number of fish in a spawning aggregation based on their mating calls. This technology can help fisheries managers design effective management practices and monitor the ongoing health of a fishery, protecting endangered species from overfishing.
Researchers found that coral-feeding fish have fleshy, slime-covered lips that help them survive by feeding primarily on coral mucus. The unique adaptation allows the fish to seal their mouths over small areas and increase suction-feeding efficiency.
Researchers discover lionfish preying on a newly named deep-sea fish species in the Caribbean, raising concerns about biodiversity loss and ecosystem disruption. The finding suggests that invasive lionfish are extending their range to the unexplored 'twilight zone,' where little is known about reefs or resident species.
Researchers found that immigrants to a new environment can survive and even reproduce better than the local population when they are rare. This is due to their unique immune system, which allows them to avoid competition for food and evade parasites. The study has implications for species restoration and conservation efforts.
Researchers at UC Berkeley have identified conscientiousness in a range of animal species, from birds to insects. This trait, characterized by working hard, paying attention to detail, and striving to do the right thing, is linked to evolutionary benefits such as improved hunting success and mating advantages.
A newly discovered damselfish species in the Philippines has been found to exhibit rare brood-guarding behavior, protecting its young until they can fend for themselves. This unusual parenting strategy significantly improves survival rates, with up to 35% of offspring surviving, compared to less than 1% for most coral reef fish.
A new study reveals that red sea rabbitfish brought live marine animals with them when they invaded the mediterranean, expanding biodiversity and threatening native ecosystems. The research highlights the role of fish in spreading invasive species through 'ichthyochory,' a previously unknown mechanism.
Scientists have measured dispersal distances of two coral reef fish species, revealing that juvenile clownfish stay relatively close to home (10-15 km), while butterflyfish disperse further (43-64 km). The study informs optimal sizing and spacing of marine reserves, with implications for conservation and fisheries management.
The annual killifish has evolved to survive in temporary ponds without water, allowing embryos to arrest development and survive for months. The new study provides an updated methodological guide for scientists studying this fascinating vertebrate model system.
Researchers discovered that oxytocin and isotocin signaling molecules play a crucial role in regulating anemonefish paternal behavior. Blocking these hormones led to decreased aggression but increased attention from the dads towards their offspring.
A comprehensive study of mesophotic coral reefs on Hawaii island has revealed the presence of a diverse range of fish species, with many found nowhere else. The research highlights the importance of these deep reefs in conserving reef fish biodiversity and providing critical habitat for shallow reef fishes.
Researchers found that in areas with high predation risk, fish differentiate into leaders and followers, leading to increased shoal cohesion. The study suggests that decision-making in social groups can adapt depending on ecological factors.
Scientists at the University of Bonn have created a realistic 3D model of a fish's lateral line system, allowing them to simulate precise current conditions. The results show that anatomical adaptations minimize background noise, enabling fishes to navigate and identify prey with high accuracy.
Researchers found that high CO2 levels boost production at different levels of the food web, but ocean warming causes stress to marine animals, preventing them from efficiently using increased resources. This led to a collapse of the food web. The study suggests that ocean warming will be an overwhelming stressor for marine ecosystems.
Researchers found that larger schooling fish exhibit stronger attraction forces compared to smaller fish. Computer simulations validated the results, revealing a key role for interdisciplinary statistical approaches in understanding social interactions.
MIT engineers detailed the hydrodynamics of archer fish's jump, revealing its unique propulsion system. The study aims to improve underwater vehicle design and could lead to the development of spyhopping vehicles.
Researchers at University of Washington and Texas A&M University discovered a new genus and species of clingfish using digital scans. The duckbilled clingfish has an impressive number of tiny, conical teeth, estimated to be 10 times what all other known clingfish have.