Articles tagged with Fish
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Researchers deployed video cameras on Navy dolphins to study their hunting behaviors in San Diego Bay and the Pacific Ocean. The footage revealed the dolphins' prey preferences, hunting strategies, and even encounters with a sea snake.
A study of the variegated snailfish reveals it has the highest expression levels of antifreeze proteins ever reported, crucial for survival in sub-zero waters. Warming oceanic temperatures pose a threat to these specialized fishes as they face increased competition from temperate species.
Researchers aim to uncover information on blotchy bass syndrome's prevalence, distribution, and potential risks through data collected by citizens. The study will help determine which bass species are susceptible and which seem immune.
A new study reveals that reef fish diversity is driven by a recent innovation among bony fish – feeding by biting prey from surfaces. This feeding method allowed fish to access diverse new prey, promoting the evolution of a wide variety of body shapes and a high rate of diversification.
Researchers found 61 out of 86 species threatened with extinction, with coastal sharks facing greatest conservation concern. Increased protections and international trade regulations are crucial to prevent extinctions among these species.
Researchers at Okinawa Institute of Science and Technology Graduate University found that garden eels retreat into their burrows to feed in strong currents, reducing drag on their body by 57%. Their feeding rate peaks at around 0.2 m/s, wider than free-swimming reef fish.
The study reveals that female Prussian carps use hijacked sperm to reproduce, producing only female clones. This unique reproductive method has allowed the species to colonize new habitats and outcompete native species.
Clown anemonefish control their growth to match larger anemones, growing faster than fish on smaller anemones. This mutualistic interaction allows for optimized reproductive value in their environment.
Researchers have discovered that chanchita, a cichlid fish native to South America, has the highest cold tolerance of all non-native species in Florida, allowing it to survive central and possibly northern Florida's winters. Chanchitas exhibit parental care behavior, with both parents guarding eggs and young.
A new UBC study finds that southern resident killer whales have been in an energy deficit for six of the last 40 years, with three recent years (2018-2020) being particularly dire. The researchers attribute this decline to lower Chinook salmon abundance and size, which are the primary food source for these whales.
A new study from Oregon State University suggests that the gelatin in Pacific whiting skin has anti-aging properties, preventing wrinkles caused by ultraviolet radiation. The researchers found a positive response in a human cell model system, providing evidence for further research.
A recent study found that brightly colored, round-bodied fish are rated as the most beautiful by the public, while less attractive species tend to be more ecologically and evolutionarily distinct. These unattractive species, including those listed as threatened or in need of conservation evaluation, may receive less public support desp...
A study of over 12,000 fish across 17 species found that cannibalism is extremely rare in the wild, occurring in less than 0.30% of cases. The researchers identified population density and resource availability as key drivers of cannibalistic behavior, contradicting previous assumptions.
Researchers discovered how electric fish evolved electric organs by modifying a sodium channel gene. The finding highlights the potential for this genetic mechanism to contribute to human diseases. By studying electric fish, scientists can gain a better understanding of evolutionary processes and their applications in human health.
Researchers evaluated the toxicological effects of BaP on bay scallops, finding increased immune response-related parameters with time at higher concentrations. The study suggests that BaP dampens the immune response of scallops and decreases their capacity to respond to oxidative stress.
Researchers from Tokyo University of Science discovered that bony fish head cartilage contains abundant proteoglycans, including aggrecan, with similar CS structures to salmon nasal cartilage. This finding reveals the potential of sturgeon as an alternative source of CSPGs for health food formulations.
A new study suggests that goldfish pose a significant risk to native biodiversity in rivers and lakes. With insatiable appetites and bold behavior, goldfish can outcompete other species for resources, leading to catastrophic outcomes.
Two new species of Amazonian fish have been discovered and described by Smithsonian researcher Murilo Pastana, one with vibrant red-orange fins and another that is technically a miniature fish. The species are at risk of extinction due to deforestation in the region where they inhabit.
A major new study is investigating the effects of beavers on the Arctic landscape, other animals, and local Indigenous communities. The project aims to understand the complex interlinkages between ecological and sociological changes as beaver numbers increase.
Researchers monitored mercury levels in artificial lakes to identify sources and factors affecting concentration. Most mercury originated from soil in catchment areas, with surface runoff contributing in shorter-residence time reservoirs.
A new study found that native species in southwestern Washington floodplains adapt to bullfrogs and sunfish by changing their feeding strategies. The researchers analyzed carbon and nitrogen stable isotopes in predators and prey to understand food webs, finding that some species shifted towards more abundant food sources.
A study has discovered that humans are disrupting a fundamental pattern in ecosystems, which dates back at least 66 million years. The U-shaped relationship between diet and size in modern land mammals has been found to span across multiple vertebrate groups, including birds, reptiles, and fish.
A Rutgers study found that climate change will alter predator-prey interactions, preventing species from adapting to changing conditions. This will lead to a decline in commercially important fisheries and a shift in the abundance of species in their new geographic ranges.
A new study published in Integrative Organismal Biology sheds light on the evolutionary history and anatomical variation of archerfishes, a group of fishes known for their ability to spit water from their mouths. Researchers found that all species can shoot, but there are differences among them.
A new study has shown that increased levels of turbulence and mixing occurred every night in a coastal bay, similar to those caused by storms. The researchers attribute the signal to shoals of fish spawning anchovies, which mix water layers and impact temperature distribution, nutrients, and oxygen.
Researchers discovered that freshwater pearl mussel larvae can protect brown trout from Flavobacterium disease outbreaks. The mussels' filtering ability removes bacteria from water, suggesting a potential application in water treatment. This finding highlights the importance of ecosystem services provided by endangered species.
Researchers found that cichlids and stingrays can perform simple arithmetic operations, such as adding or subtracting one, in the number range of one to five. The fish were trained using a color-based system and showed impressive learning abilities.
Fish species zebra mbuna and stingrays are found to possess numerical abilities on par with other vertebrate species. Through training, six of the eight zebra mbuna and three out of eight stingrays learned to associate blue with addition and yellow with subtraction, demonstrating consistent performance in recognizing numbers from 1 to 5.
A study by University of California, Davis reveals that volunteer divers with Reef Environmental Education Foundation (REEF) helped monitor more than half of the total fish species in the Salish Sea. REEF scientists expanded the known range of multiple species and documented a new species, the striped kelpfish.
Researchers discovered that certain snakehead species, including the kampango catfish, produce and provide trophic eggs as supplemental nutrition for their offspring. This unique adaptation likely enabled these fish to conquer new environments and lead to the high diversity of species in this group.
A new species of fish, the Rose-Veiled Fairy Wrasse, has been described by a Maldivian researcher and colleagues as part of the California Academy of Sciences' global Hope for Reefs initiative. The discovery reveals that the species is actually two different species with potentially more restricted distributions.
A new study provides evidence of growth limitations in Antarctic fish, which have adapted to survive in freezing temperatures. Despite similar ecological conditions, these fish consume less food and grow at half the rate of temperate water cousins when held at the same temperature.
Researchers found that pelicans primarily eat native fish species like Utah sucker and chub, with only a small percentage of cutthroat trout consumed. This discovery provides managers with more insight into the ecological dynamics of the reservoir, allowing them to focus on other factors impacting trout populations.
Researchers found that exposure to 6PPD-quinone at environmentally relevant levels can be deadly for rainbow and brook trout, but not for Arctic char or white sturgeon. The study suggests possible non-lethal effects on the latter species, warranting further examination.
Researchers found that genetic relatedness correlates with hormonal responses and behavioural reactions in fish, allowing for selective breeding of less-stressed fish. This approach could simplify breeding methods for aquaculture and aquariums.
Researchers analyzed trends in reported effects of ocean acidification on fish behavior and found that the magnitude of those impacts has decreased dramatically, with negligible effects for the past five years. Common scientific biases, such as publication bias, largely explained the decline in severe effects.
A new study from Cornell University reveals that fish are more likely to communicate with sound than previously thought. Researchers found 175 families of ray-finned fishes that use sound for communication, including species that have been doing so for at least 155 million years.
Researchers discovered adaptations allowing desert fish to thrive in harsh conditions by maintaining genetic diversity and adapting genes for aridity. This finding challenges the idea that small populations are evolutionary dead ends.
Researchers developed unprecedented insights into the natural and commercial flow of fish, highlighting the importance of inclusive approaches to fisheries management and conservation. The study's findings indicate a strong connection between larval dispersal and catch distribution in Hawaii, emphasizing the need for community-based ma...
Researchers found that hatchery-raised steelhead trout grow faster in hatchery conditions but have lower survival rates in streams, a tradeoff linked to genes favored in hatchery environments. Modifying hatchery conditions may help alleviate this issue by favoring traits needed for survival in the wild.
Native fish populations are declining due to lack of natural flow, making conservation efforts challenging. The study highlights the importance of protecting rivers with natural flow regimes to sustain native fish and their habitats.
Researchers have discovered a vast icefish breeding colony in the Antarctic Weddell Sea, with an estimated 60 million active nests spanning over 240 square kilometers. The colony represents a significant biomass of more than 60,000 tons and provides insight into a globally unique ecosystem.
Two new species of goby fish, Rhinogobius estrellae and Rhinogobius tandikan, have been discovered in Palawan, Philippines. The discovery expands the genus Rhinogobius' known range further south than previously seen.
Researchers have identified a previously unknown gene, goldentouch, responsible for the golden coloration in Midas cichlids. The gene, found on chromosome 11, is present in two variants: one associated with dark coloration and the other with orange/yellow coloration.
A team of researchers found that animals with strong site fidelity, which is returning to the same places to eat, travel, and raise their young, may not survive or reproduce as well in changing landscapes. This can lead to population declines, especially in species like mule deer affected by human development.
Research on hybrid threespine stickleback fish found that genetic signatures of hybrid incompatibilities are environment-dependent. Fish raised in ponds had a lower incidence of mismatched genes due to ecological pressures, whereas lab-reared fish showed no difference in heterozygosity.
A research team identified a general macroecological mechanism that challenges global conservation strategies, finding that remote fish communities are vulnerable to coral loss and other ecological dependencies
Researchers used CT scanning to study the cranium of Cladarosymblema narrienense, a 330-million-year-old fish that may have evolved into first four-limbed vertebrates. The analysis suggests a significant brain role in regulating endocrine glands and supports the monophyletic group of megalichthyid fish.
Researchers have discovered microRNAs that can detect ovulation and egg quality in fish, and also identify growth signatures. These findings could lead to the development of non-invasive biomarkers for monitoring animal physiological states, enabling cost-effective and accessible information on health.
A new genomics marker tool accurately identifies tilapia species and detects hybridization, providing a valuable resource for aquaculture and conservation in Tanzania. The tool offers a cheaper solution than full genome data analysis, enabling the detection of invasive and native tilapia species.
A new study from Australian Institute of Marine Science reveals that reef fish such as emperors, tropical snappers, and rockcods play a crucial role in controlling crown-of-thorns starfish numbers on the Great Barrier Reef. By removing these fish species, the abundance of coral-eating starfish increases.
A blind taste test by University of Copenhagen researchers shows Danes prefer conventional and organic farmed smoked salmon over wild-caught. The study reveals that people's expectations about a product affect their overall taste experience.
Research reveals that warm-water habitats in Upper Klamath Lake provide essential energy for cold-water fish during spring and fall, while providing limited food sources in summer. The study highlights the importance of considering multiple habitats for mobile species like redband trout in climate change conservation.
A genetic comparison of nearly two-thirds of the known species of rockfish pinpoints genes linked to their varying lifespans, which range from less than a decade to over 200 years. The study highlights trade-offs of long lifespan, including smaller populations and adaptations that increase survival
A study published in Conservation Biology found that forests surrounding rivers flowing into the sea increase the diversity of threatened fish species in Japan's estuaries. In contrast, waters surrounded by agricultural land show a decrease in fish populations.
Researchers at California Polytechnic State University found that seagrass loss in Morro Bay led to changes in fish species, with increasing numbers of flatfish like speckled sanddab and staghorn sculpin. The study highlights the importance of protecting remaining seagrass habitats to maintain biodiversity.
Late-migrating juvenile spring-run Chinook salmon of California’s Central Valley have a survival advantage during droughts and ocean warming due to their ability to grow in cool-water habitats. The study highlights the importance of secure habitats for fish to survive difficult conditions, emphasizing the need for reintroduction to sav...
A new study published in Science of the Total Environment has found that 21% of Arctic fish eaten by beluga whales contain microplastic particles. Researchers estimate that belugas ingest up to 145,000 particles of microplastics per year, highlighting the pervasive nature of plastic pollution in the Arctic.
Fish from the Gobiidae family change color more efficiently and effectively when alone, contrary to previous assumptions. This is likely due to reduced stress levels, allowing for faster and more accurate camouflage.
A study by University of British Columbia researchers reveals that southern resident killer whales have access to four to six times more Chinook salmon in the Salish Sea than northern residents. This challenges the common notion of a prey shortage for southern residents during summer feeding grounds.