Articles tagged with Fish
Research reveals eight spider families preying on fish worldwide, with diverse species adapting to aquatic environments to catch fish even larger than themselves. Semi-aquatic spiders possess powerful neurotoxins and enzymes to kill and digest their prey.
Research by Culum Brown suggests that fish are intelligent, social creatures capable of complex behaviors such as learning, cooperation, and tool use. The study concludes that fish should be afforded protection similar to other vertebrates, considering their pain perception and sentience
A study by Oregon State University researchers found that wild coho salmon choosing mates with dissimilar MHC profiles have higher reproductive success. Hatchery-reared coho, however, lack this ability to select genetically diverse mates.
New research reveals that zebra fish use optic flow but steer towards stronger flows instead of away from them. This may be due to the turbid underwater environment where visibility is limited.
Research from North Carolina State University found that dam removal improves spawning grounds for American shad and may boost their survival rates. The study reveals high mortality rates among adult fish during spawning, but suggests that improving fish passage could lead to better outcomes.
Scientists discover new golden bass species from deep waters off Curaçao, shedding light on Caribbean reef biodiversity. The newly described Liopropoma santi is characterized by its predominantly yellow body and fins.
A University of Strathclyde report suggests that EU's ban on ditching unwanted fish could have unintended consequences on wildlife and fail to improve fish stocks. Changing fishing practices to eliminate unwanted catches has dramatic effects on the entire food web, with major benefits for birds, mammals, and fish stocks.
Scientists propose new climate adaptation tools to reduce threats to amphibians, prioritizing habitat restoration in Western North America's mountainous regions. Removing non-native fish is a key strategy to restore resilience to landscapes.
Researchers have discovered two new US turtle species, the Suwannee and Apalachicola alligator snapping turtles, which are found in the southeastern United States. These ancient reptiles were previously thought to be a single species, but genetic analysis reveals deep evolutionary divisions between them.
Researchers at UMass Amherst and INPA discovered a new genus and species of electric knifefish in the Negro River, revealing unique features such as electric organs and distinct pulse patterns. The discovery is expected to contribute to a better understanding of Amazonian biodiversity and its adaptations.
Researchers from PNNL explore ways to protect fish from barotrauma, a phenomenon caused by dramatic shifts in water pressure near dams. Modifying turbines to minimize pressure change is a promising solution, improving turbine designs and reducing injuries to fish.
Two new species of weakly electric fishes, Petrocephalus boboto and Petrocephalus arnegardi, have been discovered in the Congo River basin. The species were named after words meaning peace and fellowship in Lingala language, reflecting the authors' hope for peace in troubled Central Africa.
A new study reveals that reef fish diversified into two distinct groups of fish, with the first group arriving around 70-90 million years ago, during a time when coral reefs were built by mollusks called rudists. By 50 million years ago, modern coral reefs and their inhabitants had largely taken shape.
A new study by North Carolina State University researchers found that approximately 90% of black sea bass with visible barotrauma survived, similar to those without injury. The findings inform stock assessments for sustainable fishing practices and may provide insights into mortality rates for other species.
A new study finds that adipose fins have evolved repeatedly and independently in multiple species of teleost fish, representing a unique example of convergent evolution. The research provides a new model for exploring the evolution of vertebrate appendages and challenges traditional views on how new fins and limbs develop.
A new study links bioluminescence with increased species diversity in the deep sea. Fish that use light for communication are diversifying faster than those using it for camouflage. Bioluminescent signaling may be critical to diversification of fishes in the deep sea.
A recent study found that competition between fish species in Lake Tanganyika drives the formation of new species. Two genetically distinct ecomorphs of a species have been identified, with large and small individuals occupying different habitats.
Researchers at Queen's University Belfast have developed a method to predict the impacts of invasive species based on their behavior. By analyzing the rate at which an organism consumes resources, they found that 'damaging invaders' consistently have higher curves than native species, leading to population decline and extinction.
A team of Canadian biologists developed a framework to protect fish and ecosystems, highlighting the importance of connecting waterways, protecting habitats, and adopting adaptive management strategies. The 9 guiding principles aim to promote sustainable fisheries and conserve biodiversity.
Researchers at the Prairie Research Institute found low concentrations of mercury, arsenic, and selenium in bighead and silver carp fillets from the Illinois River. These levels do not pose a health risk to the majority of human consumers, but some individuals may need to limit consumption.
A new study confirms that reducing lionfish numbers by 75-95% can allow rapid recovery of native fish biomass and aid larger ecosystem recovery. Native species such as Nassau grouper and yellowtail snapper increased by 50-70% on reefs where lionfish were kept below threshold densities.
The discovery of well-preserved pelves and partial pelvic fin material in Tiktaalik roseae reveals that the evolution of hind legs began as enhanced fins. This challenges the existing theory that large, mobile hind appendages developed after vertebrates transitioned to land.
Researchers found that competition between corals and seaweeds leads to an increase in toxic compounds in seaweeds, making them more attractive to herbivorous fish. This response is a first demonstration of how seaweeds can adapt their chemical defenses in response to competition with corals.
A global assessment reveals that fishing has reduced vital seaweed-eating fish by more than 50%, compromising coral reef health. The study highlights the importance of protecting these key species to preserve ecosystem balance.
A new study reveals that marine reserves can build community resilience through mechanisms promoting species stability, while resisting colonization by warm-water vagrants. The research highlights the importance of long-term data on fish species in understanding ecological change.
A legless, leaping fish that lives on land avoids predators by using camouflage to match its rocky environment, reducing attacks from birds, lizards, and crabs. The researchers found that the fish's unique colouration helped it survive in its new habitat, suggesting an evolutionary advantage.
Research shows ocean warming reduces swimming ability of large reef fish, impacting hunting, mating, and reproduction. The study suggests that coral trout populations may adapt to warmer temperatures, but further research is needed.
Seahorses use their specially shaped heads to capture prey, including copepods, which are notoriously difficult to catch due to their speed. In calm conditions, seahorses achieve a 90% success rate in catching their intended prey.
Researchers developed precise monitoring systems by analyzing gut microbiota of invasive Asian carp and native gizzard shad, revealing key differences between species. The study uses next-generation gene sequencing technology to identify biomarkers for each species, promising a new approach to preventing their spread in the Great Lakes.
A decade-long study reveals that Costa Rica's longline fishery catches more olive ridley sea turtles than commercial fish species, threatening their survival. The research also shows a decline in shark populations, with smaller sharks becoming increasingly common.
A new genus of electric fish, the Akawaio penak, has been identified in the upper Mazaruni River in northern Guyana. The discovery represents a significant finding for biodiversity research, as the region is a hotspot for unique and isolated species.
The round goby's rapid colonization of the upper Danube has led to a decline in native fish species such as barbel and European chub. The species' adaptability and dominance of food webs have resulted in a 'novel ecosystem,' with previously unknown combinations of species.
Researchers analyzed the genetic makeup of coelacanth offspring and found high overlap between mothers and their offspring, suggesting a single father. The study suggests that coelacanth females are monogamous, likely due to mating with a single male for successful fertilization.
Researchers at UCSB created an Eventual Threat Index (ETI) that quantifies biological and socioeconomic conditions leading to unsustainable harvest rates. The study predicts overfishing threats for eight Pacific tuna species, including yellowfin tuna, using data from the 1990s to present.
A new study reveals that fish larvae of cardinalfish and damselfish use olfactory cues to detect the presence of coral reefs, allowing them to navigate their way back home. The researchers used an o-DISC device to track larval movement and orientation in response to odor cues.
Two newly described electric fish from the Amazon produce different electric signals, with one species having a monophasic EOD that is unusual in its kind. This trait may have evolved to mimic that of the electric eel, while also providing stability and communication benefits.
A new study by the Wildlife Conservation Society found that 13 species of crocodilians consume fruit, including berries and legumes. The researchers suggest that these animals may function as significant seed dispersal agents in freshwater ecosystems, contributing to forest regeneration.
A recent study by Ben-Gurion University researchers found that divers are willing to pay to improve aspects of reef biodiversity, with respondents ranking biodiversity as the most desirable value. The study's findings may help inform conservation efforts and direct the design of future marine reserves.
A study published in PeerJ found that 'ray' wings sold to consumers in Ireland and the UK may include vulnerable species, such as the blonde ray, which has a declining population trend. The study highlights the need for improved labelling of foods to protect consumers and promote conservation.
Researchers found that juvenile Atlantic salmon raised in enriched tanks with pebbles, rocks, and artificial plants outperformed those in standard tanks. The study suggests that creating more natural environments can boost fish intelligence and adaptability, leading to higher survivability when released into the wild.
Ray-finned fish, including species like Fouldenia and Styracopterus, rapidly diversified in the aftermath of the Hangenberg extinction. They exploited ecological opportunities to fill vacant niches, using their crushing jaws to prey on hard-shelled animals.
Consumers can safely eat at least 12 ounces of cooked seafood per week if they pay attention to local seafood advisories and limit their intake of large, predatory fish like shark. Research is ongoing to improve food safety for these high-risk fish, with experts emphasizing the importance of handling practices, preparation, and storage.
Researchers discovered significant lionfish populations and large predatory fish at 300 feet deep in the Atlantic Ocean. The findings raise concerns about the control of this invasive species that's devastating native fish populations.
Scientists have discovered a new species of armored catfish, Pareiorhina hyptiorhachis, in the Rio Paraíba do Sul basin, Brazil. The newly described species is one of the smallest representatives of the catfish order, measuring only about 3-3.5 cm in length.
A 10-year study by the Virginia Institute of Marine Science found that low-oxygen 'dead zones' in Chesapeake Bay are impacting demersal fish species, including Atlantic croaker and summer flounder. The study showed a drastic decline in species richness and catch rates under low-oxygen conditions.
A study found that copper pollution prevents fish from detecting danger signals emitted by other fish, making them more susceptible to predation. Researchers also discovered that nickel has a lesser effect on the fish's olfactory system.
Researchers discovered a fat cell near male sea lampreys' dorsal fin produces heat when approached by females, a previously unknown mechanism in spawning. This finding sheds new light on the invasive species' biology and may help reduce its numbers or eliminate it from the Great Lakes.
Researchers found reduced populations of small, bottom-dwelling fishes like darters and increased sedimentation rates due to dredging alter habitats, leading to regime shifts in fish species. This study highlights the complex effects of human activities on aquatic ecosystems in large rivers.
A Griffith University study found that current water releases limit fish reproduction and impact freshwater biodiversity. Restoring natural low flow periods is critical to produce food for dependent fish species.
The three-spined stickleback exhibits preference for joining shoals of relatives over unfamiliar individuals. Despite exposure to familiar and unfamiliar kin, the fish showed no preference for selecting group members based on familiarity.
Biologist Keith Gido is discovering dramatic changes in native fish communities due to the North American drought. River fragmentation and groundwater withdrawals are affecting aquatic systems and native fish species in the Great Plains.
A recent study by University of Michigan researchers has found that sturgeon have evolved at an incredible rate in terms of body size, with some species reaching sizes comparable to those of Volkswagen vans. This discovery challenges the common perception of sturgeon as 'living fossils' and sheds new light on the evolutionary process.
A new species of blenniiform fish, Haptoclinus dropi, has been discovered in the biodiversity-rich waters of the southern Caribbean. Measuring only 2cm in length, it features a unique color pattern and four divisions on its dorsal fin.
A new study suggests that ocean acidification could lead to increased hearing sensitivity in fish, with potential benefits for navigation and communication. Researchers found that fish raised in low-pH seawater had larger otoliths, which are used for hearing and balance, resulting in up to a 58-percent increase in otolith mass.
Scientists have discovered a new species of armored fish in north central Pennsylvania, providing insights into evolutionary changes during the Devonian period. The discovery was made possible by a technique used to analyze fossil impressions, which allowed researchers to create a detailed description of the new species.
Researchers have discovered a new fossil species, Holoptychius bergmanni, in the Canadian Arctic during the Devonian period. The discovery sheds light on the evolutionary transition from finned vertebrates to limbed vertebrates and provides insights into the life of large predatory fish in this ecosystem.
A study by Washington State University researchers found that fishers in Hawaii's nearshore fisheries travel longer distances to catch fish due to the placement of marine protected areas. Despite this, their social and economic status remain unchanged.
Researchers found that clownfish fan their anemone hosts to increase oxygen consumption, benefiting both species. The fish's nocturnal antics may also improve circulation in the anemone, supporting life under low oxygen conditions.
A recent study using underwater video cameras has identified four species of herbivorous fish as the primary cleaners of coral reefs in the South Pacific. These fish are highly picky eaters and target specific types of seaweeds, highlighting the importance of biodiversity for reef health.
Fish can determine their size relative to others using chemical cues alone. This ability helps form groups with strength in numbers, reducing individual risk from predators. The study found that both species used chemical self-referencing to locate similarly sized fish of the same species.