Articles tagged with Marine Fishes
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A new study reveals a surprising exception to the rule of uniformity across the Indo-West Pacific coral reef ecosystem. Chlorodielline crabs with overlapping ranges have uniquely shaped gonopods, but otherwise appear identical, suggesting genetic divergence in different geographic areas.
A University of British Columbia study suggests that jellyfish size can influence their nutritional value. The researchers found that larger jellyfish tend to have higher levels of healthy fats, making them potentially more nutritious.
A new study shows that reversing evolutionary changes in fish stocks like cod can be profitable and help conserve natural genetic diversity. With century-long planning horizons, evolutionary decline can be reversed without significantly reducing profits.
Researchers found that mesophotic reefs differ from shallower counterparts, suggesting a strong ecological filter between depths. The study highlights the need to expand marine protections for coral reefs beyond shallow waters, emphasizing the unique biodiversity and vulnerability of deeper ecosystems.
A new study assesses DNA metabarcoding's performance in identifying fish eggs on the West Florida Shelf, highlighting its value for long-term monitoring of spawning sites and habitats. The technique can identify multiple species from a single sample, but may introduce biases by excluding rare species.
A new study reveals that northern and southern resident orcas differ in their hunting behaviors, with males catching more salmon per hour than females. Southern resident males outperform females by 152%, highlighting a distinct pattern of foraging that may contribute to the population decline.
Researchers found that current anti-predator gear can reduce clam mortality by four- to tenfold, with double-layered treatments showing the highest survival rates. However, rays were still capable of interacting with the gear for prolonged periods, potentially diverting them from other natural habitats.
Researchers suggest that returning to spawn at different ages can lessen the impact of a bad year and increase population stability for Sacramento River fall-run Chinook salmon. Changes in hatchery practices and fishery management could help restore the age structure of the population, making it more resilient to climate change.
Research from the University of Cambridge and Cardiff University found that damselfish scare off cleaner fish customers, leading to fewer species receiving vital cleaning treatment. This disruption could contribute to the breakdown of delicate ecosystems supported by coral reefs.
The researchers designed the robot to mimic the movement of flippers in water and centipedes on land, resulting in impressive speeds of 1.5 body lengths per second on land and 0.74 body lengths per second in water. The amphibious robot has potential applications in search and rescue, marine agriculture, and fish feeding.
Aquaculture can help restore ecosystems by removing excess nutrients and promoting biodiversity. Conservationists are using aquaculture techniques to create healthy habitats for marine species, including shellfish reefs and fish populations.
A new Yale study reveals that fish species diversify most rapidly in colder climates at higher latitudes where they can transition between shallow and deep waters. However, climate change is expected to impede this process, posing a threat to the high biodiversity found in tropical waters.
A 250.8 million-year-old fossil find reveals complex marine ecosystems on Earth just one million years after the Permian-Triassic mass extinction, contradicting long-held theories. The discovery provides insights into life's rapid recovery from extreme crises and necessitates a re-evaluation of early Triassic ocean conditions.
Researchers from Portugal and Cape Verde discover a unique shark nursery in the Sal Rey bay on Boa Vista island, home to juveniles of several endangered species. The area is crucial for shark conservation and also protects marine mammals and turtles, highlighting the importance of its protection.
A new laboratory study shows that microplastics increase the severity of an important viral fish disease. Nylon fibers had the greatest impact on disease severity. The findings have major implications beyond fish farming, affecting human health and natural environments.
Research from Virginia Tech reveals that shark populations are recovering in northern Atlantic waters where regulations have been put in place. This is a promising conservation success story for vulnerable species.
Researchers found that larvae of the Atlantic mangrove fiddler crab survived less in warmer water and underwent physiological changes due to higher acidity. Marine heatwaves will be harmful to species and those that feed on them, with potential economic losses to fisheries. Further research is needed to understand the effects.
A study found that mesopelagic fishes, including lanternfishes, shrink in size with climate warming. Body sizes decreased by 35% during the interglacial period, affecting the ocean's ability to reduce atmospheric carbon dioxide.
A new study reveals that fishes in the deep ocean are likely to decrease in size with climate warming, which could have significant ecological effects. Researchers analyzed ancient fish otoliths to track changes in body size over glacial and interglacial periods.
A study of preserved fish specimens reveals a 140-year decline in parasite populations due to warming oceans. Parasites with multiple host species declined severely, threatening ecosystems and top apex predators. The study highlights the vulnerability of parasites to climate change and inspires further research.
Scientists found that invasive black rats transform reef fish behavior, causing changes in territorial patterns and nutrient cycles. The presence of rats disrupts the nutrient cycle by reducing seabird populations and nutrients deposited onto islands.
A recent study by Lancaster University found that coral bleaching events alter the behavior of butterflyfish, making it harder for them to recognize competitor species. This change leads to poorer decision-making, resulting in wasted energy and increased aggression.
A study published in Scientific Reports found that the sharpsnout seabream's mortality during early life stages has a genetic basis. The research analyzed genomic data from recruits and survivors of the species, finding associations with birth time, sea surface temperature, and growth rate. The results suggest that genetics plays a cru...
Researchers analyzed fossil bed in Nevada's Berlin-Ichthyosaur State Park to determine cause of mass extinction. They found evidence that ichthyosaurs died due to migration, not mass stranding or environmental toxins.
Researchers from University of Miami Rosenstiel School found that fish larvae use external directional cues for orientation, contrary to previous assumption that they rely on internal cues. This discovery offers insights into understanding marine fish dispersal, protected areas and population connectivity.
Research reveals distinct genetic groups of sand lance, a crucial forage fish, with different genome regions on chromosomes 21 and 24. The findings indicate that temperature-driven currents create genetic barriers, affecting population connectivity and survival.
Research published in Nature Food suggests that small pelagic fish like herring and sardines are abundant and affordable sources of nutrients, particularly selenium, omega-3 fatty acids, and zinc. The study found that these fish could help close nutritional gaps in sub-Saharan Africa and other low- and middle-income countries.
Researchers at FAU Harbor Branch Institute found that Florida pompano larvae can be grown in salinities as low as 10 parts per thousand without adverse effects. The study showed that growth, fatty acid profiles, and transcriptome responses were normal across different salinities.
Researchers found that small pelagic fish such as herring and sardines are the cheapest nutritious fish in 72% of low- and middle-income countries. These fish can help close nutrient gaps, particularly in sub-Saharan Africa where deficiencies are rising.
Researchers found that small pelagic fish, such as herring and sardines, are a cheap source of nutritious seafood. These fish can provide essential micronutrients like iron, zinc, and omega-3 fatty acids to vulnerable populations in low-income countries.
A study explores the link between shark nose shape, size, and sensitivity of smell. The researchers found that more lamellae in rosettes with an elongated shape are associated with increased odor sensitivity.
A new study reports that SharkGuard, a shark deterrent device, significantly reduces the number of blue sharks and pelagic stingrays caught in tuna fisheries. The technology emits a localized electric field around a baited hook, discouraging sharks from biting without getting hooked on other fish.
Researchers found that a device called SharkGuard emits small electrical pulses to scare off sharks, reducing bycatch by up to 91% for blue sharks and 71% for stingrays. Further testing is needed to explore the effects on target species like bluefin tuna.
An interdisciplinary team will uncover complex biological systems and develop tools to globally document coral reef health changes. The research aims to understand how herbivory rate at the ecosystem scale emerges and shapes the ecosystem, ultimately informing management of ecosystems.
Researchers developed a global indicator to measure marine biodiversity based on extinct fish populations, revealing worsening extinction risk since the 1950s. Implementing management measures can reduce fishing mortality and recover tunas and billfishes, but sharks continue to face threats due to overfishing.
An international team of researchers found evidence of cooked fish remains at the Gesher Benot Ya'aqov archaeological site in Israel, dating back approximately 780,000 years. This discovery predates previous knowledge by about 600,000 years and sheds light on the evolution of cooking techniques.
A study found widespread occurrence of microplastics in Monterey Bay water and in the digestive tracts of anchovies and common murres. The researchers discovered that almost a quarter of the examined murres had particles exhibiting estrogenic activity, potentially disrupting hormone functions.
Researchers at the Royal Netherlands Institute for Sea Research found an upward trend in skate populations in the North Sea, with a significant increase off Scotland's north coast. The study also revealed that skates mainly eat shrimp, providing ecological potential for more fish to thrive.
Scientists discovered that ancient fish favored cold, dark waters of the deep sea, challenging the assumption that shallow habitats have always been diverse. The study revealed three major events that drove speciation rates in the deep sea, including the breakup of Pangea and the Cretaceous Hot Greenhouse period.
A new study found that offshore mussel farms can increase species abundance, including Atlantic horse mackerel and European lobster, on degraded seabed habitats. The research suggests that this practice could have wider environmental benefits, supporting the national and international Blue Growth agenda.
The US Harmful Algal Bloom Control Technology Incubator aims to advance innovative ways to control blooms impacting marine ecosystems and regional economies. The partnership between UMCES and Mote Marine Laboratory & Aquarium will offer funding and guidance for innovative control technology projects.
Researchers have discovered that reef halos, visible from satellite imagery, can provide insights into coral reef health globally. These bands of bare seafloor surrounding coral patch reefs are more common and dynamic than expected, with the potential to serve as a window into reef health.
Researchers found that short-term changes in health of juvenile sockeye salmon are related to the quality of zooplankton, not biomass or composition. This highlights concerns about climate change affecting ocean conditions and salmon populations.
A large marine protected area in Hawaiʻi has led to the recovery of tunas and other large fish species. The Papahānaumokuākea Marine National Monument increased catch rates by 54% for yellowfin tuna, benefiting both the environment and the global tuna fishing industry.
The Southern Ocean's ecosystem is facing major stressors from climate change, including melting sea ice and ocean acidification. Overfishing of species such as toothfish and krill is predicted to exacerbate environmental impacts on the entire ecosystem.
In a study published in PLOS ONE, researchers found that large pelagic fish prefer using sharks as scratching surfaces for parasites. In contrast, smaller fish tend to avoid taking this risk due to the threat of predation, highlighting the adaptability of these species.
A new study found that social, economic and political barriers hinder the global distribution of the $424 billion aquatic food industry's benefits. The study calls for policies to ensure equitable access to this sector, which supports both welfare-based benefits like jobs and affordable nutrition, as well as wealth-based benefits.
Research found that native predatory fish like jacks and barracuda feed on Australian mullet, an invasive species introduced to Oahu waters. This shift in diet helps control the invasive mullet population, which competes with native fish for resources.
A new species of deep-sea fish has been discovered in the Atacama Trench, belonging to the genus Paraliparis. The small blue snailfish, named Paraliparis selti, is distinct from other hadal snailfishes due to its striking color and large eyes.
A recent study from Japan reveals that color patterns on fish influence their aggressive behavior and determine the color patterns of cohabitating fish. The study found that anemonefish with white bars on an orange or red background exhibit aggressive behavior towards other fish with similar color patterns.
A team of researchers has observed orcas killing white sharks in South Africa using drone and helicopter footage. The study provides the first direct evidence of this behavior, showing that orcas are capable of pursuing, capturing, and incapacitating white sharks.
A team of researchers has discovered a 439-million-year-old ancient 'shark' that predates the earliest jawed fish and is believed to be humans' oldest jawed ancestor. The fossil, named Fanjingshania, features an external bony armor and multiple pairs of fin spines.
Researchers Dr Zoe Doubleday and Dr Jasmin Martino created a map of ocean chemistry that distinguishes the origin of seafood between south-east Asia and southern Australia. The universal chemical fingerprints can track where individual seafood comes from, helping to combat seafood fraud and ensure consumer trust.
A new study finds that neon goby parents help their offspring develop by pushing them out the door at the right time. Offspring hatched by parents are larger and more developed than those that hatch on their own, suggesting a complex parenting behavior. This discovery highlights the surprising complexities of fish parenting behavior.
Threespine stickleback fish evolved resistance to freshwater tapeworms by forming scar tissue around them, which prevents the worms from growing. However, this defense has a significant fitness cost for female sticklebacks, as they are 80% less likely to successfully breed due to the accumulated scarring.
A 12,000-year analysis of El Niño's impact on animal communities reveals a tipping point where five or more major events per century lead to dramatic changes in eastern Pacific ecosystems. This finding suggests that strong El Niño events will play an increasingly important role in shaping future ecosystems.
A new study suggests that global fish stocks will not be able to recover to sustainable levels without strong actions to mitigate climate change and overfishing. Climate change has reduced fish stocks in 103 of 226 marine regions studied, including Canada, from their historical levels.
Researchers found that Māui dolphins' diets became less diverse between 2008 and 2020, mainly due to the establishment of a marine sanctuary that restricted fishing in their habitat, leading to an increase in preferred prey.
A recent study found that ocean cooling over the past 100 million years led to increased body size in tetraodontiform fishes, adhering to Cope's and Bergmann's rules. The researchers combined genomic and fossil data to support this finding, which was previously less well understood for ectothermic species.
A study by the University of Surrey found that Cornish fishers transitioning to marine tourism are experiencing improved mental and physical health, as well as financial gains. This diversification allows traditions to remain alive while reducing pressure on fishing stocks, leading to a more sustainable industry.