Articles tagged with Fish
The discovery of well-preserved pelves and partial pelvic fin material in Tiktaalik roseae reveals that the evolution of hind legs began as enhanced fins. This challenges the existing theory that large, mobile hind appendages developed after vertebrates transitioned to land.
Researchers found that competition between corals and seaweeds leads to an increase in toxic compounds in seaweeds, making them more attractive to herbivorous fish. This response is a first demonstration of how seaweeds can adapt their chemical defenses in response to competition with corals.
A global assessment reveals that fishing has reduced vital seaweed-eating fish by more than 50%, compromising coral reef health. The study highlights the importance of protecting these key species to preserve ecosystem balance.
A new study reveals that marine reserves can build community resilience through mechanisms promoting species stability, while resisting colonization by warm-water vagrants. The research highlights the importance of long-term data on fish species in understanding ecological change.
A legless, leaping fish that lives on land avoids predators by using camouflage to match its rocky environment, reducing attacks from birds, lizards, and crabs. The researchers found that the fish's unique colouration helped it survive in its new habitat, suggesting an evolutionary advantage.
Seahorses use their specially shaped heads to capture prey, including copepods, which are notoriously difficult to catch due to their speed. In calm conditions, seahorses achieve a 90% success rate in catching their intended prey.
Research shows ocean warming reduces swimming ability of large reef fish, impacting hunting, mating, and reproduction. The study suggests that coral trout populations may adapt to warmer temperatures, but further research is needed.
Researchers developed precise monitoring systems by analyzing gut microbiota of invasive Asian carp and native gizzard shad, revealing key differences between species. The study uses next-generation gene sequencing technology to identify biomarkers for each species, promising a new approach to preventing their spread in the Great Lakes.
A decade-long study reveals that Costa Rica's longline fishery catches more olive ridley sea turtles than commercial fish species, threatening their survival. The research also shows a decline in shark populations, with smaller sharks becoming increasingly common.
A new genus of electric fish, the Akawaio penak, has been identified in the upper Mazaruni River in northern Guyana. The discovery represents a significant finding for biodiversity research, as the region is a hotspot for unique and isolated species.
The round goby's rapid colonization of the upper Danube has led to a decline in native fish species such as barbel and European chub. The species' adaptability and dominance of food webs have resulted in a 'novel ecosystem,' with previously unknown combinations of species.
Researchers analyzed the genetic makeup of coelacanth offspring and found high overlap between mothers and their offspring, suggesting a single father. The study suggests that coelacanth females are monogamous, likely due to mating with a single male for successful fertilization.
Researchers at UCSB created an Eventual Threat Index (ETI) that quantifies biological and socioeconomic conditions leading to unsustainable harvest rates. The study predicts overfishing threats for eight Pacific tuna species, including yellowfin tuna, using data from the 1990s to present.
Two newly described electric fish from the Amazon produce different electric signals, with one species having a monophasic EOD that is unusual in its kind. This trait may have evolved to mimic that of the electric eel, while also providing stability and communication benefits.
A new study reveals that fish larvae of cardinalfish and damselfish use olfactory cues to detect the presence of coral reefs, allowing them to navigate their way back home. The researchers used an o-DISC device to track larval movement and orientation in response to odor cues.
A new study by the Wildlife Conservation Society found that 13 species of crocodilians consume fruit, including berries and legumes. The researchers suggest that these animals may function as significant seed dispersal agents in freshwater ecosystems, contributing to forest regeneration.
A recent study by Ben-Gurion University researchers found that divers are willing to pay to improve aspects of reef biodiversity, with respondents ranking biodiversity as the most desirable value. The study's findings may help inform conservation efforts and direct the design of future marine reserves.
A study published in PeerJ found that 'ray' wings sold to consumers in Ireland and the UK may include vulnerable species, such as the blonde ray, which has a declining population trend. The study highlights the need for improved labelling of foods to protect consumers and promote conservation.
Researchers found that juvenile Atlantic salmon raised in enriched tanks with pebbles, rocks, and artificial plants outperformed those in standard tanks. The study suggests that creating more natural environments can boost fish intelligence and adaptability, leading to higher survivability when released into the wild.
Ray-finned fish, including species like Fouldenia and Styracopterus, rapidly diversified in the aftermath of the Hangenberg extinction. They exploited ecological opportunities to fill vacant niches, using their crushing jaws to prey on hard-shelled animals.
Consumers can safely eat at least 12 ounces of cooked seafood per week if they pay attention to local seafood advisories and limit their intake of large, predatory fish like shark. Research is ongoing to improve food safety for these high-risk fish, with experts emphasizing the importance of handling practices, preparation, and storage.
Researchers discovered significant lionfish populations and large predatory fish at 300 feet deep in the Atlantic Ocean. The findings raise concerns about the control of this invasive species that's devastating native fish populations.
Scientists have discovered a new species of armored catfish, Pareiorhina hyptiorhachis, in the Rio Paraíba do Sul basin, Brazil. The newly described species is one of the smallest representatives of the catfish order, measuring only about 3-3.5 cm in length.
A 10-year study by the Virginia Institute of Marine Science found that low-oxygen 'dead zones' in Chesapeake Bay are impacting demersal fish species, including Atlantic croaker and summer flounder. The study showed a drastic decline in species richness and catch rates under low-oxygen conditions.
A study found that copper pollution prevents fish from detecting danger signals emitted by other fish, making them more susceptible to predation. Researchers also discovered that nickel has a lesser effect on the fish's olfactory system.
Researchers discovered a fat cell near male sea lampreys' dorsal fin produces heat when approached by females, a previously unknown mechanism in spawning. This finding sheds new light on the invasive species' biology and may help reduce its numbers or eliminate it from the Great Lakes.
Researchers found reduced populations of small, bottom-dwelling fishes like darters and increased sedimentation rates due to dredging alter habitats, leading to regime shifts in fish species. This study highlights the complex effects of human activities on aquatic ecosystems in large rivers.
A Griffith University study found that current water releases limit fish reproduction and impact freshwater biodiversity. Restoring natural low flow periods is critical to produce food for dependent fish species.
Biologist Keith Gido is discovering dramatic changes in native fish communities due to the North American drought. River fragmentation and groundwater withdrawals are affecting aquatic systems and native fish species in the Great Plains.
The three-spined stickleback exhibits preference for joining shoals of relatives over unfamiliar individuals. Despite exposure to familiar and unfamiliar kin, the fish showed no preference for selecting group members based on familiarity.
A recent study by University of Michigan researchers has found that sturgeon have evolved at an incredible rate in terms of body size, with some species reaching sizes comparable to those of Volkswagen vans. This discovery challenges the common perception of sturgeon as 'living fossils' and sheds new light on the evolutionary process.
A new species of blenniiform fish, Haptoclinus dropi, has been discovered in the biodiversity-rich waters of the southern Caribbean. Measuring only 2cm in length, it features a unique color pattern and four divisions on its dorsal fin.
A new study suggests that ocean acidification could lead to increased hearing sensitivity in fish, with potential benefits for navigation and communication. Researchers found that fish raised in low-pH seawater had larger otoliths, which are used for hearing and balance, resulting in up to a 58-percent increase in otolith mass.
Researchers have discovered a new fossil species, Holoptychius bergmanni, in the Canadian Arctic during the Devonian period. The discovery sheds light on the evolutionary transition from finned vertebrates to limbed vertebrates and provides insights into the life of large predatory fish in this ecosystem.
Scientists have discovered a new species of armored fish in north central Pennsylvania, providing insights into evolutionary changes during the Devonian period. The discovery was made possible by a technique used to analyze fossil impressions, which allowed researchers to create a detailed description of the new species.
A study by Washington State University researchers found that fishers in Hawaii's nearshore fisheries travel longer distances to catch fish due to the placement of marine protected areas. Despite this, their social and economic status remain unchanged.
Researchers found that clownfish fan their anemone hosts to increase oxygen consumption, benefiting both species. The fish's nocturnal antics may also improve circulation in the anemone, supporting life under low oxygen conditions.
A recent study using underwater video cameras has identified four species of herbivorous fish as the primary cleaners of coral reefs in the South Pacific. These fish are highly picky eaters and target specific types of seaweeds, highlighting the importance of biodiversity for reef health.
Fish can determine their size relative to others using chemical cues alone. This ability helps form groups with strength in numbers, reducing individual risk from predators. The study found that both species used chemical self-referencing to locate similarly sized fish of the same species.
Researchers found carbon dioxide to be an effective tool in repelling fish from an area, with all four species tested showing the same response. This non-physical barrier could complement electric fences and increase the likelihood of stopping invasive Asian carp from entering Lake Michigan.
A team of economists and fish ecologists found that modern fish passage facilities were unsuccessful in allowing economically important species such as salmon, shad, and river herring to pass through dams. The study highlights the need for dam removals to restore diadromous species populations.
A new fossil discovery in southern California challenges earlier claims of a 'killer walrus' existing. The ancient creature was found to have a diet rich in fish, contrary to initial estimates that it preyed on marine mammals.
A comprehensive snapshot of pupfish evolution reveals how natural selection drives specialization through the creation of adaptive landscapes. Research shows that species are often limited to generalist feeding styles due to stabilizing selection.
A new study reveals that fish play a crucial role in recycling nutrients, providing fertilizer for sea grass and algae growth. The research found that fish populations around reefs can cause significant changes in ecosystem productivity.
The California Academy of Sciences has described 137 new species across four continents and two oceans, adding to the complex web of life on Earth. These discoveries strengthen conservation efforts by providing a deeper understanding of evolution and the persistence of life.
Scientists are studying fish ear bones to understand the impacts of climate change on fish growth and distribution. The otoliths, which record annual growth rings, can provide insights into environmental conditions and help guide conservation efforts.
A recent study found that reserve-reared fish are less wary of divers and can be caught closer than those living in fished areas. This increased accessibility makes the local fish harvest more sustainable, potentially improving support for marine reserves.
A new species of coelacanth, Reidus hilli, has been identified in Texas, revealing a previously unknown family and providing insights into the evolutionary history of this ancient fish. The discovery sheds light on the diverse history of coelacanths, which have remained largely unchanged for 400 million years.
Researchers found that silvery fish have evolved a multilayer structure in their skin containing two types of guanine crystals, allowing them to maintain high reflectivity and conceal themselves from predators. This adaptation could lead to better optical devices, such as LED lights and low-loss optical fibers.
A VCU study found evidence of fall spawning by Atlantic sturgeon in the James River, a finding that may lead to guidelines and protections for future management and recovery. The research also highlights the need to understand unique ecological traits of the James River population.
A study published in Animal Behaviour found that a hormone similar to oxytocin increases responsiveness to social information and promotes cohesion in fish. The discovery sheds light on the evolution of complex social behaviors in some species.
AZTI-Tecnalia coordinates two €1.5M research projects on bluefin tuna to study population structure, migrations, growth, and reproduction. These projects will inform ICCAT's conservation efforts in the Atlantic and Mediterranean.
Researchers found that specialized cichlid swim bladder extensions improve hearing by detecting higher sound frequencies, while the size of the swim bladder also plays a crucial role. The study investigated 1,300 cichlid species with varying swim bladder morphologies.
Biologists present a simple way to estimate maximum sustainable yield (MSY) using catch data and species resilience. The new method has been tested on 148 fish stocks with excellent agreement compared to traditional methods.
Indo-Pacific coral reefs are more resilient due to lower seaweed growth rates and a higher abundance of herbivorous fish, which treats seaweed as a delicacy. The study suggests that these reefs can withstand degradation before being overtaken by seaweeds.
Researchers found that males with ant-eating traits have ornament shapes resembling ants, attracting female bites that develop a search image for the food. Sensory drive promotes differences among populations based on species in the community.
Researchers found that BPA alters fish behavior and appearance, leading to inter-species breeding. This process poses long-term ecological consequences, including the potential decline of native species.
A study led by University of British Columbia researchers found that the EU pays less than it did two decades ago while catching more fish in Madagascar's waters. The total annual income for Madagascar decreased by almost 90% between 1986 and 2010 due to unfair access fees.
Scientists developed the first laboratory system to evaluate pile driving's effect on fish, finding individual blows above a certain sound level can irreparably harm them. The recommended sound threshold aims to minimize harm to marine animals while permitting ocean development.
The study of Acanthodes bronni, a 290-million-year-old fossil fish, sheds light on the evolution of early jawed vertebrates. The researchers found that the common ancestor of all jawed vertebrates resembled a shark, with features such as cartilaginous jaws and primitive sensory organs.