Articles tagged with Ichthyology
A study by Rutgers marine biologist Malin Pinsky found that fast-growing fish species are more likely to experience dramatic population declines than slower-growing ones. Overfishing and climate variability were identified as major culprits, with some species collapsing to less than 10% of their historical levels.
A new study has found that rising ocean temperatures and acidification have a significant impact on the survival and development of Antarctic dragonfish. The research reveals that warmer waters can accelerate embryonic development, but also lead to increased mortality rates.
New research published in Environment & Behavior found that watching aquariums and fish tanks can improve physical and mental wellbeing. The study showed noticeable reductions in blood pressure and heart rate, with higher numbers of fish helping to maintain attention for longer.
A recent study has identified 53 key genes involved in fish's ability to adapt to warmer temperatures over multiple generations. The research found that metabolic and immune genes play a crucial role in enabling fish to cope with higher temperatures, improving their chances of survival in a changing climate.
Dilbit spills can harm fish populations with deformities and genetic stress, reducing survival rates by impairing feeding and predator avoidance. The study provides a technical basis for decisions on dilbit transportation in Canada.
Researchers found that pet care can significantly improve monitoring of Type 1 diabetes in adolescents, leading to lower blood glucose levels. The study's senior author instructs families to associate regular pet fish care with diabetes care, resulting in improved hemoglobin A1C levels.
Researchers found suspended sediment harms fish gills, reducing oxygen intake and triggering diseases. This study highlights the need for coastal developments to consider sediment's impact on reef ecosystems.
Climate change is expected to increase pesticide toxicity in fish, as warmer temperatures become toxic at the upper limit of species' temperature tolerance. The study reveals that pesticides and industrial contaminants become toxic when temperatures reach 50C, making fish more vulnerable to environmental changes.
A new study by University of Massachusetts Amherst fisheries biologist Andy J. Danylchuk is assessing the impact of catch-and-release fishing on the golden dorado fish in South America. The study aims to develop conservation strategies and sustainable fishing practices for this iconic species, which is crucial to the regional ecotouris...
Researchers develop new method to trace salmon migration and habitat use by analyzing ear bones for strontium signatures. This technique may aid conservation efforts for threatened salmon populations facing climate change, industrial development, and overfishing.
A new study found that a deep-water fish called the opah harnesses heat generated by flapping its pectoral fins to warm its body. This unique adaptation enables the opah to operate in cold and deep water with high-performance capabilities.
A study by University of Wisconsin-Milwaukee researchers found that exposure to metformin causes intersex conditions and stunted growth in male fish. The diabetes medication was detected in freshwater systems worldwide and is being investigated as a potential endocrine disruptor.
A new study examines human impact on Pacific coral reefs, finding significant reductions in fish biomass at most reefs due to human presence. The analysis of nearly 40 islands and atolls reveals that even low levels of human influence can cause substantial declines in fish abundance.
Researchers found that bats follow a set of internal 'traffic rules' while foraging, including chasing and avoiding collisions. By copying nearby individuals' flight directions within a short time frame, bats can efficiently navigate their surroundings.
Research in the Bay of Biscay found liver pathologies, tumors, and other health problems in deep-water fish, linked to human-caused pollution. The study also discovered the first case of an intersex condition in a deep water fish species.
A study published in HortScience found that hydrolyzed fish fertilizer is an economically feasible nitrogen source for growing organic vegetables, even when yields are reduced. The authors concluded that the premium price and resultant profit associated with organic products can offset the yield reductions.
Researchers found that BPA exposure in fish can lead to reduced fertilization rates and increased embryo mortality in subsequent generations. Exposure occurred during embryonic development, resulting in adverse effects on future reproductive health.
Researchers from JCU and a Saudi university are conducting a three-year joint study to understand why fish exposed to high water temperatures have offspring already acclimatised. The study aims to uncover the epigenetic changes triggered by the environment that enable fast adaptation.
A pioneering study analyzing 57,000 fish censuses reveals that sardines and other pelagic fish are highly vulnerable to changes in ocean temperature, driving them to migrate north. The research warns of significant socio-economic and ecological repercussions for coastal towns dependent on these fishery resources.
Researchers have developed a new injectable acoustic fish tag that allows for safe and quick insertion into young fish, reducing the risk of altering their behavior. The new tag, which is about as big as two grains of rice, can release beeps every 0.4 seconds and lasts up to 120 days on a single battery.
A new study led by the University of Michigan found that mercury concentrations in Hawaiian yellowfin tuna increased at a rate of 3.8% per year from 1998 to 2008, likely due to rising atmospheric mercury levels. This increase is consistent with global trends and highlights the need for stricter policies to reduce mercury emissions.
Scientists have discovered a way to produce both biodiesel and jet fuel from a single type of algae, utilizing its unique fatty acid compounds. The breakthrough could hold potential for commercialization, but further research is needed to scale up production.
Research in Seychelles finds that fish consumption during pregnancy may offset mercury exposure risks, with polyunsaturated fatty acids (PUFA) counteracting toxic effects. Higher PUFA levels in mothers are linked to better neurological development in children.
China's enormous aquaculture sector is under scrutiny for its impact on global seafood supplies. The Stanford-led study suggests a more sustainable alternative using processing waste to reduce pressure on wild fisheries.
The study found that disease was the primary culprit, accounting for 26% of mass die-offs, while direct human effects and biotoxicity from algae blooms contributed significantly. The number of mass mortality events has been increasing by about one event per year over 70 years.
A team of researchers studied the red devil cichlid, a species with two color variants, and found that the darker individuals can alter their brightness to match their environment, while the gold-colored fish cannot. This ability may play a crucial role in maintaining color frequencies in the wild.
A study by Oregon State University and Simon Fraser University found that small fish with long bodies are most likely to be attacked by lionfish, which can increase their chances of being eaten by up to 200 times. The research also identified common traits among prey species that make them vulnerable to predation.
Biologists believe the increased return rate of naturally spawned sockeye is high enough for the species to eventually sustain itself in the wild. Naturally spawned fish are returning at rates up to three times higher than those released from hatcheries.
A study from North Carolina State University reveals that human-induced habitat alteration leads to changes in the shape and size of male mosquitofish genitalia, particularly in fragmented waters. The research suggests that these changes may be driven by reduced predation pressure, which can influence reproductive success.
Researchers found that cautious fish are more vulnerable to fishing, while active exploratory behavior increases risk. Fish reared in enriched environments outperform those in traditional environments, showing improved survival rates in the wild.
A study identified 181 California dams that may need increased water flows to protect native fish, with the top priority dams including Trinity Dam and New Melones Dam. The new tool provides a scientific basis for dam operators to prioritize management and reduce the risk of extinction for many native species.
Researchers found that male bluefin killifish use their fins to signal different information, including social standing and health. The colorful fins display messages to other fish about the fish's aggression level, body condition, and parasite infection status.
Researchers at the University of Tennessee discovered that certain species of cichlid fish exhibit playful behavior, such as attacking a thermometer. This finding suggests that play is not unique to humans and may be an essential part of animal biology.
Climate change is projected to drive large-scale shifts in fish populations, with some species moving away from their current habitats at a rate of up to 26 kilometers per decade. This could lead to significant losses in tropical regions, including the loss of important fisheries and communities that rely on fish for food and nutrition.
Fish larvae produce distinct 'knock' and 'growl' sounds within the hearing range of adult fish to maintain group cohesion during their pelagic journey. The sounds were observed in 70% of nighttime trials, suggesting a mechanism for larval communication.
Eyeless Mexican cavefish show no metabolic circadian rhythm under varying lighting conditions, saving up to 30% less energy compared to surface-dwelling fish. This adaptation enables the fish to thrive in food-limited environments without unnecessary energy expenditure.
A study by NOAA's NCCOS found that warming Atlantic temperatures are causing fish communities to shift towards deeper, warmer waters. The researchers used year-round bottom water temperature data and fish community surveys to detect climate change-induced shifts in algal populations.
Researchers found that coral trout can choose the best moray partner for hunting, and even learn which one is more helpful. They use intentional communication to manipulate the behavior of suitable species to achieve a common goal.
A global study reveals that current marine protected areas are insufficient to safeguard key ecological functions performed by fish species, which provide vital services for coastal habitats. The research identifies vulnerable fish populations outside existing protected areas, emphasizing the importance of expanding these networks.
A new study from the University of British Columbia found that male stickleback fish with bigger brains are more likely to care for their young. The research compared regular male sticklebacks to white sticklebacks, which do not care for offspring, and found a link between brain size and parental behavior.
New study finds that seafood mislabeling distorts true abundance of fish, defrauds consumers, and causes unwanted exposure to harmful pollutants like mercury. The researchers found that even MSC-certified fish can have high mercury levels if substituted with other species from the same geographic area.
Researchers at the University of Pittsburgh found that eating baked or broiled fish once a week is associated with greater grey matter brain volumes in areas responsible for memory and cognition. The study suggests that lifestyle factors contribute to structural changes in the brain, rather than biological factors.
A new study found that different fish species respond uniquely to noise pollution, with three-spined sticklebacks reacting faster to sound when a predator is present. This discovery highlights the need for targeted management of noise in marine environments to mitigate its effects on aquatic ecosystems.
A new study by Tel Aviv University researchers has identified the biological flaw that causes most fish larvae to die within days of hatching. The 'hydrodynamic starvation' mechanism is triggered by the physical interaction between the larva and its environment, leading to poor feeding ability and high mortality rates.
Research reveals a large diversity of spiders engaging in fish predation globally, with semi-aquatic species catching small freshwater fish. Spiders use powerful neurotoxins and enzymes to kill and digest fish, providing an occasional nutrient-rich prey item.
A recent study from the University of British Columbia found that high seas fish and aquatic life remove 1.5 billion tonnes of carbon dioxide annually, valued at $148 billion US. This compares to the $16 billion paid for 10 million tonnes of caught fish, highlighting their importance as a natural carbon sink.
A new species of cavefish, Amblyopsis hoosieri, has been discovered in southern Indiana and is the first new species described from the US in 40 years. It lacks eyes and vision but maintains a functional rhodopsin gene to navigate dark waters.
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.
A newly discovered fish, Kryptoglanis shajii, has a unique combination of characteristics that set it apart from other catfishes. The fish's bone structure shows modified shapes and changes in certain bones, giving it a bulldog-like snout and conical teeth.
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.
A recent modeling study reveals that fish consumption advisories are ineffective in reducing infant exposure to long-lived pollutants like persistent organic pollutants (POPs), with estimates suggesting only a 10-15% reduction in child exposure even for mothers who stop eating fish before pregnancy.
Research confirms that fish living on coral reefs with high levels of carbon dioxide are less able to detect predator odors. The study found that these fish were also bolder and more likely to engage in risky behavior, but had fewer differences in species richness or composition.
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.
Research reveals endocrine disrupting chemicals cause feminization in male thick-lipped grey mullet; 60-91% of males show vitellogenin and Aromatase Cyp19a1b gene expression, indicating feminization. Estuaries across Basque coast show high levels of pollutants contributing to the phenomenon.
A new study has found that exposure to crude oil from the Deepwater Horizon spill can cause serious defects in heart development and function of fish embryos. The research highlights the potential impacts on commercially important pelagic fish populations in the Gulf of Mexico.
A recent study by NOAA scientists reveals that the Northwestern Hawaiian Islands' deep coral reefs contain nearly 50% of fish species unique to Hawaii, surpassing any other marine ecosystem. The discovery highlights the need for further conservation efforts and exploration of these largely unexplored ecosystems.
Researchers documented dramatic differences in swimming ability between domesticated and wild trout, calling into question the effectiveness of hatcheries in conserving native populations. The study found that domesticated trout tend to grow faster but are slower sprinters than their wild relatives.
A recent study at the University of Eastern Finland found that increasing fatty fish intake can increase large HDL particles in the blood, which protect against cardiovascular diseases. Regular consumption of fish, especially fatty fish like salmon and rainbow trout, may help improve lipid metabolism and reduce cholesterol levels.
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.