Articles tagged with Fish
The USGS presented several studies on various fish-related topics, including the benefits of habitat restoration for juvenile salmon and the importance of targeting younger silver carp to control their population. Climate change may impact smallmouth bass populations, with warmer temperatures affecting growth in southern climates.
Researchers discovered B chromosomes causing female-biased sex-ratios in a species of cichlid fish from Lake Victoria. The study also identified multiple protein-coding genes in the B chromosomes, suggesting their role in sex determination.
A recent Oregon State University study suggests that parasites in fish can have profound impacts on fish health and contribute to salmon mortality. The research found that heavy parasite loads can affect salmon growth, immune function, and other issues, and are linked to land use changes such as logging and agriculture.
Cabo Pulmo National Park has proven to be the world's most robust marine reserve, with a 463% increase in fish biomass from 1999 to 2009. The park's 'no take' restrictions and local enforcement have been key factors in its success.
Research published in Nature reveals Canadian cod populations are recovering, with haddock playing a dominant role, and a reversal of predator-prey roles contributing to the growth of smaller fish species. The study suggests an ecological transition towards balance is underway.
A UBC graduate student found that the mangrove fish's eyes have separate opsin genes for aerial and aquatic light, enabling adaptation to its environment. The study shows how gene duplication can lead to innovation in organisms.
A new study suggests that the threat posed by invasive Asian carp to the Great Lakes ecosystem is real and warrants action. The research finds that separating the Great Lakes and Mississippi River basins through hydrological separation could provide a permanent solution to prevent further ecological and economic harm.
In a study published in Ecology, researchers found that banded tetras play a keystone role in nutrient recycling due to their diet composition and excretion rates. This finding highlights the importance of conservation efforts in maintaining ecosystem function.
A 100-million-year-old mayfly fossil has provided valuable insights into the ecology of ancient ecosystems. The discovery of a rare ovipositor and long antennae sheds light on the life cycle and adaptations of this ancient species.
A ban on fisheries discards in the North Sea is expected to promote fish stock recovery and increase fishermen's incomes, according to new research. The study compared long-term data sets on cod, haddock, saithe, and herring in the North Sea with those in Norwegian waters, where a discard ban was introduced in the late 1980s.
A team of researchers successfully barcoded over 28,000 Australian moth and butterfly specimens, covering 65% of the country's known species. This achievement will transform biodiversity monitoring and biosecurity efforts in Australia.
Researchers used Facebook to accurately crowdsource data on a fish survey in the Cuyuni River. Almost every fish specimen was identified by experts within 24 hours. The successful crowdsourcing project has implications for future scientific studies.
A study found that Atlantic molly females from regular surface streams have difficulty reproducing in dark conditions and are more prone to stress-induced bacterial columnaris disease. The research suggests that permanent darkness severely hampers reproduction in these fish, highlighting the importance of light for their survival.
A growing seal population has led to increased damage to fish and fishing gear, highlighting the need for sustainable alternatives. Scientists have identified certain seals as specialists in attacking trap equipment, but also found that pot fishing can be a viable alternative to net fishing.
A new study finds that small fish populations are just as likely to have collapsed in the last 50 years as large fish stocks. Small species were up to twice as likely to have suffered a major decline due to overfishing, highlighting their importance in the oceanic food chain.
Researchers found that advancements in brain anatomy and signal processing allowed mormyrids to fully exploit electric signal space, leading to rapid speciation. The study revealed two equally parsimonious ways to reconstruct the fish's evolutionary history, challenging current understanding of brain development.
A new study by UC Davis found that two groups of pupfish from the Bahamas and Yucatan peninsula show extreme evolutionary changes, adapting to specialized diets in just a short period. The research suggests that these rapid evolutions are unique to these specific environments.
Researchers found that copepod carcasses play a crucial role in understanding oceanic food webs. Non-predatory mortality accounted for over 10% of all copepod deaths, providing insights into the fate of these tiny crustaceans.
Two new studies by UC Davis researchers found a direct link between lead ammunition and lead poisoning in scavenger birds like eagles and turkey vultures. The studies suggest that hunting with lead ammunition can have devastating effects on these bird species, causing inability to fly, starvation, anemia, blindness, seizures and death.
Highly diverse reef fish systems are the most vulnerable to human threats, yet they produce a greater range of goods and services. The study found that these ecosystems do not saturate with additional species, and their biomass production is negatively impacted by increasing human density.
A new study reveals that triclocarban (TCC) accumulates rapidly in fish, with levels reaching 1,000 times higher than those in the water. This is the first report of TCC uptake and metabolism in fish species, highlighting concerns about its potential endocrine-disrupting effects.
A year-long study by University of Nevada, Reno researchers found a significant decline in native fish species density at Lake Tahoe since 1951. The team recommends establishing a management plan to protect the nearshore zone habitat critical to native fish populations.
A study in Spain and Greece found that over 30% of hake products sold in these countries were mislabelled, with African fish often labelled as European or American. The error benefits middlemen, not African fishermen.
Predatory fish such as cod, tuna, and groupers declined by two-thirds while small forage fish like sardine, anchovy, and capelin more than doubled between 1880 and 2007. This trend suggests that humans are impacting ecosystems globally.
A new predictive method developed by marine scientists has found that a third of reef fishes studied across the Indian Ocean are potentially vulnerable to climate change. The 'extinction risk index' provides coral reef managers with insights to better protect and manage coral reefs, showing local and regional commitment improves prospe...
Scientists at Smithsonian Institution and Ocean Science Foundation used genetic analysis to identify 10 distinct species of blennies (Starksia) previously thought to be three. The discovery sheds light on the complexity of Caribbean reef life, with widespread species exhibiting geographically restricted ranges.
A new Oregon State University study finds that healthy steelhead runs rely heavily on wild rainbow trout populations, with up to 40% of genes from rainbow trout contributing to steelhead gene pool. This highlights the importance of maintaining healthy trout populations to support steelhead health.
A review of 93 wild and aquaculture fish populations found that regional variance affects reproduction, growth, and stress response in trout, salmon, charr, whitefishes, and graylings. The research highlights the importance of considering local adaptation when transplanting species to new habitats.
A Purdue University study found that Lake Erie's large hypoxic zone negatively impacts aquatic life, but not all fish species equally. The study showed that some species, like yellow perch, were less affected, while round goby and rainbow smelt were more significantly impacted by the low oxygen levels.
Researchers found that communities of similar-looking catfish often comprise multiple species, highlighting the hidden diversity and complexity of neotropical freshwater ecosystems. The discovery has significant implications for environmental conservation, as many rivers are facing large-scale development and habitat destruction.
Scientists have found a difference in visual perception between male and female cichlid fishes, which likely aids in mate selection. The research discovered that males and females detect light differently, with five photoreceptor cones in their eyes, enabling color discrimination.
Researchers argue that the US Fish and Wildlife Service should consider societal values when determining whether species need protection from extinction. A study analyzing public opinions on wolves in the northern Rocky Mountains found mixed results, contradicting the agency's claim that attitudes have improved over time.
In experiments with African cichlid fish, scientists found that females show increased anxiety and decreased attraction when their preferred male loses a fight. Conversely, when the male prevails, the female's brain shows increased activity associated with reproduction and pleasure. These findings suggest that humans may experience sim...
A study published in Science reveals that Amazonian biodiversity is linked to the geological history of the Andes, dating back to the past 20 million years. The researchers argue that studies aiming to understand Amazonian forests' evolution need to look further back in time.
A team of researchers led by Michigan State University will investigate the effects of increasing doses of mercury on yellow perch. The study aims to shed light on the negative repercussions of low-level pollutants on fish populations.
Researchers discovered that reef fish punish blennies for stealing food without punishment, resulting in reduced future attacks on punishers. This behavior creates a public good, as all members of the species benefit from the punishment.
Researchers found that Mexican cavefish exposed to a natural fish toxin developed resistance, passing tolerant genes to offspring. This adaptation was triggered by an indigenous ritual that was discontinued due to government pressure, revealing the power of natural selection in response to human activity.
USDA researcher David Straus found copper sulfate effective in controlling Ich and a fungus on catfish eggs, offering an inexpensive and safe solution for aquaculture. The treatment has potential for widespread use in fish ponds worldwide due to its ease of application and effectiveness.
A global study by the International Union for Conservation of Nature (IUCN) reveals that 33% of shark, skate, and ray species are threatened with extinction. Conservation actions have benefited a few vertebrate species worldwide, but insufficient efforts to slow the overall increase in threatened species.
USDA researchers are developing new fish feeds with lower levels of fishmeal and fish oil, replacing traditional sources with concentrated plant proteins. The alternative diets show promise in supporting the growing demand for fish as a lean protein source, while promoting sustainability in aquaculture production.
A new study from North Carolina State University reveals that fish located near coal-fired power plants have significantly lower levels of mercury than those further away. High levels of selenium, a chemical also emitted by these facilities, are believed to be the reason behind this surprising finding.
Significant changes in coastal fish species distribution are observed in south-eastern Australia, partly due to climate change. The study identified 43 species exhibiting shifts thought to be climate-related, including warm temperate surf-zone species and range increases for Snapper and Rock Flathead.
The study found that China's enormous population drives its high ranking, despite low per capita fish catch and consumption. The United States comes in third, while Peru ranks second in catch but not top 20 in consumption.
A new molecular technique can detect Anisakis larvae in all types of fish, including processed products, using high specificity and sensitivity. This method offers a quick and effective solution for seafood inspection, replacing traditional visual examination and digestion methods.
A comprehensive study found mercury levels in Lake Erie walleye are rising, contrary to declines in other Great Lakes fish. The increase is attributed to environmental factors like invasive mussel populations and food web modifications.
Researchers discover two new species of pancake batfishes, Halieutichthys intermedius and H. bispinosus, and re-describe another, H. aculeatus, in waters affected by the recent oil spill. The discovery highlights the potential loss of undocumented biodiversity.
Research suggests that small and isolated reefs are more susceptible to local species extinctions due to variable fish populations. Larger, connected habitats see fewer fluctuations in population sizes, making them more resilient to changes.
Researchers warn that rising CO2 levels could dramatically change the behavior of baby fish, making them more susceptible to predators and decreasing their chances of survival. This shift is expected to have serious implications for the sustainability of fish populations, threatening food security as a result.
Researchers observed 10 to 20 snailfish congregating at a depth of 7703 meters, suggesting that few species of fishes survive in the darkness of the hadal zone. The study, published in BioScience, provides evidence that liparids dominate the deep ocean's hadal environment.
Researchers recommend decentralizing forces and forming alliances to counter threats, as seen in the natural world. By adopting these principles, security systems can become more adaptable and responsive to emerging threats.
The Biodiversity of Saba Bank collection provides critical information on the benthic communities and reef fish that inhabit the Saba Bank. The research reveals six new species potentially new to science collected from one of the largest coral reefs in the Caribbean, highlighting the need for marine protected areas to protect this uniq...
This interdisciplinary study explores the role of the Bering Glacier system in the northeast Pacific Ocean and global sea level. The book includes contributions from researchers on various disciplines, including glaciology, geology, and ecology.
A new study shows that hammerheads evolved from a large ancestor, but their distinctive head shape changed over time due to selective environmental pressures. Small hammerheads likely evolved independently twice, and their smaller size may have led to increased energy investment in reproductive activities.
A mass extinction of fish 360 million years ago led to the demise of dominant species and created a new world. The Hangenberg event marked a critical shift in vertebrate diversity, with few surviving species giving rise to modern vertebrates, including humans.
A 12-year study by Wildlife Conservation Society found that fishery closures and gear restrictions in Kenya's coast increased revenue and net profits for local fishermen. The study revealed that closures attracted more preferred species and larger fish, commanding higher prices per pound, which boosted fishers' incomes.
A rare opportunity to study how a critically endangered species copes with an earthquake- induced tsunami has been provided by researchers. The Devils Hole pupfish inhabit a small, shallow pool in the Mojave Desert, and the quake's impact on their habitat and behavior was documented on camera.
Researchers found that common seaweed species in Pacific and Caribbean Oceans can kill corals using chemical means. The study suggests that the proliferation of seaweeds may prevent natural recovery from happening at all, especially for reefs damaged by human use or overfishing.
Researchers found trawl fish landings peaked in 1937 at 14 times higher than today and bottom-living fish availability fell by 94%. The decline in popular fish stocks such as cod, haddock, and plaice is more profound than previously thought. The study suggests a longer period of damage to fisheries has taken place
Scientists used DNA barcoding to identify 25% of 'cod' and 'haddock' samples as genetically different species, highlighting a need for transparency in the seafood industry. The study found that smoked fish samples were incorrectly labeled at an 82.4% rate, with some species masquerading as cod or haddock.
New research using DNA barcoding identifies specific tuna species with high mercury levels, which can pose a health risk to frequent fish eaters. The study suggests that consumers can minimize their mercury intake by choosing lower-mercury tuna options like yellowfin, and calls for clearer labeling of tuna species.