Articles tagged with Fish
A new study reveals that ancient fish species Tanyrhinichthys mcallisteri, dating back 300 million years, exhibits features similar to modern sturgeons despite divergent evolutionary paths. The findings indicate multiple instances of convergent evolution, highlighting the adaptability of fish in response to environmental conditions.
A recent study published in Global Change Biology found that infectious disease-induced mass mortality events occur in 14% of marine mammal species, with viruses causing 72% of these events. Habitat breadth was also a key factor, with pinnipeds being overrepresented among affected species.
A new study reveals that great white sharks spend most of their time foraging just above the seabed, contrary to the common stereotype of a shark's dorsal fin above the surface. The diet of juvenile white sharks consists mainly of fish species that live on or near the seafloor.
Researchers found that removing just the top 26 meters of a platform results in an average loss of only 10% of fish biomass, while completely removing it leads to a 95% reduction. Partial removal supports significantly more fish biomass than complete removal.
A new study found that the diets of reef fish dictate how fast different species evolve, with big vegetarian fish driving biodiversity. The study's authors built an evolutionary tree of life for nearly all fishes associated with reefs, examining variation in rates of species formation and asking what drives it.
A study using CRISPR technology has developed a rapid detection platform to genetically distinguish threatened fish species from non-native species in near real-time. This tool shortens the process from hours to minutes, enabling researchers to identify species quickly and accurately.
Novel feeds made from microalgae, insect protein and oils could partially substitute fishmeal and oil in aquaculture feeds without negative impacts on efficiency or omega-3 profiles. This study predicts future aquaculture production growth between 37-98% depending on consumer preferences.
A recent study analyzed a large-scale aquaponic system in Germany, finding potential for environmental and cost benefits when produced sustainably. The research highlights the need for expertise in both aquaculture and horticulture, as well as sufficient facility size to ensure profitability.
A comprehensive study has found evidence of oil exposure in all 2,500 sampled fish, including popular seafood types. Chronic PAH exposure can harm fish health, despite low levels in flesh, highlighting the need for long-term monitoring.
Menhaden growth in the Gulf of Mexico is primarily influenced by environmental conditions such as wind and climate cycles, whereas in the Atlantic, fishing pressure is the dominant factor. The study suggests that reducing competition among menhaden may lead to increased growth rates.
A new study led by Dr. Asta Audzijonyte found that changes in water temperature drive changes in average fish species sizes across time and spatial scales. Tropical species tend to get smaller at warmer end of their distribution ranges, while larger species tend to increase in size.
Researchers found that fish and zooplankton behavior are disrupted by artificial light during the polar night, affecting stock assessments of commercial and non-commercial fish species. They also discovered that this disruption occurs as far down as the Mesopelagic Zone, where it can impact fisheries surveys.
Researchers found that robotic turtles with small size and slow movements disturb fish minimally, promoting better fish welfare and efficiency. This technology can provide online updates and monitoring without human intervention, leading to quicker responses and lower mortality rates.
A study led by Marius Roesti of the University of Bern found that predation by large fish is stronger in temperate zones than near the equator, contradicting the biotic interactions hypothesis. The researchers analyzed over 900 million predator attacks and found that fish species richness peaks at the equator.
A new study reveals that fish on Caribbean coral reefs harbor unique gut microbial communities, with some microbes living broadly in the ocean while others are resident to specific species. The researchers found 59 dominant types of microbes in five fish species.
The Calusa kingdom relied primarily on fishing due to the watercourts, which were built around A.D. 1300 and served as short-term holding pens for fish before consumption or preservation. The structure's design required an understanding of daily and seasonal tides, hydrology, and the biology of various fish species.
Researchers discovered remains of various marine animals in a Portuguese cave occupied by Neanderthals between 106,000 and 86,000 BCE. This finding suggests that many Neanderthal groups shared similar dietary habits, contradicting the common perception of them as cold-climate hunters.
An international research team discovered that Neanderthals consumed mussels, fish, and seals over 80,000 years ago, similar to anatomically modern humans. This finding suggests a potential link between seafood consumption and the development of cognitive abilities in these ancient human populations.
A recent study has revealed that Arctic light pollution can significantly impact the behavior of fish and zooplankton, even at depths of up to 200 meters. The researchers used autonomous underwater vehicles to observe the effects of artificial light on these organisms during the polar night.
New study finds that populations of native fish species on both sides of Niagara Falls are genetically distinct, indicating no significant interbreeding or migration past the falls. This suggests that the falls and Welland Canal serve as effective barriers to prevent invasive aquatic species from entering the Great Lakes.
The study found that fish species and size affect the types and amounts of plastics ingested, with larger fish consuming more plastics. The research sheds light on how plastics enter marine ecosystems from urban watersheds and highlights the need for better understanding to reduce plastic pollution's impact.
Researchers recorded 2,750 minutes of underwater sounds in five major river systems, identifying over 7,000 distinct sounds. Most were from unknown biological sources, while human-caused noise dominated the landscape, potentially harming aquatic ecosystems.
Researchers found that harvest slots can outperform classic minimum-length limits in maximizing kilogram yields while protecting large spawning fish and maintaining ecosystem diversity. This approach stabilizes population dynamics without causing loss in yields, increasing the average size of catch fish.
Researchers propose using preserved museum fish specimens to calculate length-weight relationships, aiding in estimating biomass and studying hard-to-reach species. This method improves data accuracy by leveraging existing specimen information.
A new study finds that sequential hermaphroditism in reef fish evolves when larger males dominate mating territories, controlling mates and resources. This theory is supported by comparative analysis of 89 species of wrasses and parrotfishes with different mating systems.
A new study found that low oxygen levels and warm temperatures have a strong negative impact on fish diversity in the Gulf of California. Despite these conditions, some species can survive due to adaptations. The research has implications for managing deep-sea ecosystems as climate change occurs.
A new study published in Nature Sustainability shows that irrigation of cattle feed crops is the leading driver of water shortages and fish imperilment in the Western United States. Sixty fish species are at an elevated risk of global extinction due to flow depletion, primarily caused by irrigation of cattle-feed crops.
Researchers discovered genetic differences between families of the same fish that confer resistance to the lethal virus. This finding could help protect tilapia stocks worth nearly $10 billion to the global economy and alleviate hunger in developing countries.
A new study projects significant shifts in fish species distributions due to climate change, with tropical countries losing up to 40% of their species by 2100. The researchers highlight the need for international cooperation and strict greenhouse gas emissions reductions to mitigate the impact on vulnerable nations.
A new study warns that ocean warming will lead to the loss of commercial fish species, with tropical nations facing significant economic and ecological impacts. The research highlights the lack of policy interventions to address this issue, but suggests that international cooperation could mitigate losses and preserve resources.
A study found that a high diversity of fish in the Rupununi region of Guyana indicates healthy forest ecosystems. Protecting this area can help preserve rivers and biodiversity across the Amazon.
Scientists have uncovered a crucial role of mucosal antibodies, specifically IgT, in regulating the microbiome and defending against pathogens in fish. By manipulating the immune system of rainbow trout, researchers found that IgT plays two paradoxical roles: reducing bad microbes while promoting beneficial bacteria.
Researchers used high-resolution microcomputed tomography to study the anatomy of three known specimens of T. marauna, a Neotropical electric fish species. The study revealed characteristics of the fish's bones without requiring dissection, providing new insights into this rare species.
The Global Reef Expedition found that coral reefs in Tonga were moderately healthy, but fish communities needed attention. The report highlights the importance of marine conservation and recommends expanding management efforts to protect fish resources.
A research team found 261 'gyotaku' rubbings with printed specimens, providing distributional data for 235 species. The study suggests that 'gyotaku' may be an important source of historical biodiversity data for rare and endangered species.
A study found that microplastics transfer through the food chain in coastal ecosystems, impairing fish growth. Organisms also fail to detect DDT-laden microparticles, increasing exposure risks.
Researchers have discovered a new species of goby, Larsonella pumilus, off the coast of Okinawa, revealing insights into its habitat and relationships with other deep-sea fish. The discovery was made at a depth of 214 meters, making it the deepest recorded finding of the species.
A large desalination plant in Sydney, Australia, has been found to attract certain species of fish, increasing their abundance at the discharge site. The researchers suggest that turbulence caused by high-pressure release of salty solution may be responsible for this effect.
A recent study by Dr. Karin Limburg and Michele Casini reveals that hypoxia caused by climate change is responsible for the declining condition of Baltic cod. The researchers analyzed otoliths, or earstones, found in the fish's hearing and balance system, which showed a clear link between hypoxia and the decline of the species.
Researchers found parrotfish populations surge in damaged reefs, consuming microalgae and cyanobacteria that provide food for the fish. This 'feedback loop' helps coral recover as reef health improves, with parrotfish numbers declining once ecosystems stabilize.
Researchers found that playing healthy reef sounds through loudspeakers in dead coral patches doubled fish arrival and increased species diversity by 50%. This 'acoustic enrichment' method could help kick-start natural recovery processes on damaged coral reefs.
A study published in Nature Climate Change found that climate change is altering the mix of species in oceans, with warm-water species rapidly increasing and cold-water marine species decreasing. This shift can disrupt fisheries and ocean food chains.
A study found that recreational fishing in Wisconsin's walleye lakes contributes to declining fish stocks, with overharvesting reaching 40% in some areas. The research suggests that fisheries managers should consider production rates instead of abundance alone to set more effective regulations.
A new study by the University of Plymouth explores how wild fishes behave spatially when reacting to an artificial stimulus, such as a laser. Researchers found that certain species would 'chase' the lasers, up to five metres, and that there were differences based on size and gender within species.
Research finds that prey-size plastics are abundant in fish nurseries and outnumber larvae by 7 to 1. The discovery could impact marine ecosystems as these plastics may be ingested by larger fish.
A new study reveals that North Sea fishing vessels discard over 267,000 tonnes of fish, enough to feed 3.45 million birds, and this figure has declined since 1990. The discarded fish support scavenging bird species, with the largest declines observed in northern fulmars, black-legged kittiwakes, and herring gulls.
A new study published in the Proceedings of the National Academy of Sciences found that reduced mercury use in the Great Lakes region has not led to a decline in mercury accumulation in large game fish. Instead, aquatic invasive species such as quagga and zebra mussels are forcing fish to seek atypical food sources enriched in mercury.
The Gill-Oxygen Limitation Theory explains why fish migrate poleward in response to warming waters. As water temperature increases, the amount of dissolved oxygen decreases, making it harder for fish to breathe, while also increasing their oxygen demand.
Researchers discovered the water conditions that drive snakeheads onto land, where they can survive for up to 20 hours. The study's findings can inform natural resources agencies' population management strategies.
Arapaima's scales are made of tough yet flexible layers bound by collagen, adapting to prevent piranha bites. The thick collagen layers may be the secret to its defense.
A recent study by Brown University researchers found that biologically diverse communities are more resistant to environmental changes and can thrive in turbulent areas. This is because highly mobile species can adapt to changing conditions by darting to safe locations or accessing abundant food sources.
Researchers at the University of Washington have confirmed that piranhas and pacus lose and regrow all teeth on one side of their face multiple times throughout their lives. This unique system allows them to distribute stress over their teeth, enabling efficient chewing and potentially justifying the loss of a full set of teeth.
The study found that the presence of Nassau grouper had a positive effect on fish abundance, with groups having both a resident grouper and complex habitat producing the highest numbers of fish. Habitat complexity also significantly benefited fish populations, with degraded sites having fewer than 50 fish on average.
The study's findings indicate that global tuna catches have increased by 1,000% in six decades, driven by industrial fisheries operating beyond capacity. The Pacific Ocean accounts for 67% of total catches, with many species, including bluefin and sharks, facing significant threats.
A University of Alaska Fairbanks study tested 297 subsistence-caught fish from Kotzebue Sound and found average mercury levels safe for unrestricted consumption. Only four individual fish exceeded the
Researchers develop robotic fish predators that induce fear responses in mosquitofish, triggering avoidance behaviors and physiological changes associated with energy reserve loss. Brief exposure to a robotic largemouth bass replica provokes meaningful stress responses in mosquitofish.
The hoary bat population is declining at a rate that suggests the species is in jeopardy in the Pacific Northwest. The study found evidence of decline for the hoary bat, but not for the little brown bat, which has been heavily impacted by white-nose syndrome.
Researchers at the Smithsonian's National Museum of Natural History have discovered three distinct species of electric eels in the Amazon basin, showcasing their remarkable diversity and adaptability. The newly identified species can produce up to 860 Volts of electricity, significantly more than previously known species.
Researchers found that European whitefish muscle omega-3 fatty acid concentration declined by 60% from growing to spawning seasons. Local people traditionally fish for winter supplies during the main growing season when nutritional quality is optimal, reflecting an understanding of the fish's energy-demanding spawning process.
A study by the University of Bonn found that parasitic worms, such as Pomphorhynchus laevis, use bright orange coloring to attract specific host fish like barbels and sticklebacks. This strategy increases infection rates in these species, which are suitable for the parasite's reproduction.