Articles tagged with Marine Fishes
Researchers at the Smithsonian Tropical Research Institute found that coral reefs on Panama's Pacific coast support 100 times more sharks than those in the Caribbean, despite heavy fishing pressure. The study suggests that ocean productivity should be considered when setting conservation targets to avoid overestimating shark populations.
Researchers discovered a strong link between environmental variation and thyroid hormone signaling in reef fish, enabling them to adapt to changing habitats. The study found that habitat impacts development by altering gene expression and metabolic profiles, giving animals more flexibility when their environments change.
A study of bull shark behavior found that individuals are slightly more likely to associate and socialise with relatives than unrelated sharks. This 'kinfluence' effect may contribute to both proximity-based associations and directed social interactions, particularly among male sharks.
A new study by the University of Miami Rosenstiel School reveals that male and female bonnetheads have distinct head shapes that develop differently as they mature. Contrary to previous research, the sharks' heads become rounder in females, not more pointed when reaching sexual maturity.
A new species of shrimpgoby, Tomiyamichthys oriens, has been discovered in Indonesian coastal waters. The fish boasts radiant orange markings and is named after its birthplace, Banyuwangi's 'Sunrise of Java' region.
Researchers found that populations of small invertebrates thrive near rat-infested islands, where seabirds are scarce. In contrast, fish biomass is higher on reefs without rats, benefiting from nutrient-rich guano deposits.
Researchers analyzed shark vertebrae to discover a finely engineered biomechanical system supporting strength, flexibility, and swimming efficiency. Different species evolved unique internal structures reflecting their varied swimming strategies.
Researchers have discovered a key breeding ground for endangered sand tiger sharks off the coast of São Paulo, Brazil. The Alcatrazes Archipelago Wildlife Refuge provides a vital sanctuary for the critically endangered species, allowing them to complete their reproductive cycle in Brazilian waters.
Researchers found basking shark denticles are massive and arranged in 'paver blocks,' allowing for stretching during filter feeding. This unique arrangement may promote flexibility and repel parasites.
Researchers at Oregon State University found that bat rays produce a chemical cue to alert other rays of potential danger. The study used three tanks with individual bat rays and simulated a predator in one tank, causing the other rays to exhibit a flight response.
A team of oceanographers has made two live observations of the elusive goblin shark in its natural deep ocean habitat. The new study extends their known depth range and geographic range significantly, with sightings reported near Jarvis Island and the Tonga Trench.
The study of exceptionally preserved fossils from a 62.2-million-year-old site in Egypt reveals that modern marine fish communities were already established approximately 4 million years after the dinosaur extinction. The Qreiya 3 Lagerstätte, an offshore marine ecosystem from the Danian Age, has yielded hundreds of fossil fishes, incl...
A study found that ocean acidification makes reef habitats less complex, causing fish to gather in smaller shoals with reduced social protection. Fish in bigger groups tend to be bolder and more active.
Researchers analyzed over 7,000 salmon stomachs to understand their diet in different regions of the Salish Sea. The study found that year-round, herring are the most important food for adult Chinook salmon, while seasonal changes affect the diversity of prey.
A University of Maine study found that US consumers are willing to pay more for lobster rolls made with ropeless fishing technology due to increased animal welfare concerns.
A new study reveals that four specific genes are crucial for the Atlantic herring's adaptation to low salinity in the Baltic Sea. The genes, expressed in sperm, eggs, and early embryos, enable the fish to reproduce successfully in brackish water.
A new study demonstrates that animal-borne sensors, such as those on tagged sharks, can enhance ocean forecast accuracy in regions with limited observational data. By incorporating shark-collected temperature and depth data into a seasonal climate model, forecast errors decreased substantially, particularly in coastal and shelf regions.
Research reveals warm-bodied fish like sharks and tunas burn nearly four times more energy than cold-blooded counterparts, exacerbating the impact of warming oceans. As a result, these species are facing an increasing risk of overheating and habitat loss.
Researchers tracked the impact of beach nourishment on nearshore conditions and marine life, finding that prolonged turbidity can interfere with blacktip shark hunting and increase accidental encounters. The study highlights a delicate balance between coastal engineering projects and marine ecosystem protection.
Researchers confirm Parapriacanthus ransonneti lacks luciferase gene, instead relies on ingested proteins to produce bioluminescence. This unique adaptation represents a form of kleptoproteinism with potential applications in drug delivery systems.
Researchers have uncovered a gene responsible for the unusual patterning in Snowflake clownfish, which has provided key clues toward solving the mystery of biological organization. The study suggests that a universal framework for studying pattern formation across species exists.
Parties to the Convention on Migratory Species agree to list 40 additional species on Appendices I and II, including iconic species like cheetahs, hyenas, and great hammerhead sharks. The agreement also includes multi-species conservation plans for key regions like the Amazon.
Removal of just 15 females from thresher shark populations annually could lead to population decline and even extinction. The study used stereo videography to monitor the population and found fragility in their behavior.
Researchers found juvenile smalltooth sawfish showing strong site fidelity to the South Fork of the Saint Lucie River, spending up to 87% of their time within a 0.4 square kilometer area. This suggests that the Indian River Lagoon is once again functioning as a nursery for this endangered species.
Researchers found that bull sharks have active social preferences and choose their social partners, similar to humans. The study revealed that adult sharks form the core of the social network, while younger sharks are less socially connected.
A new study by Stockholm University researchers reveals distinct populations of Baltic Sea herring with varying levels of genetic adaptation to local conditions. The findings highlight the importance of genetic diversity in managing herring populations and suggest that current fishing practices may be detrimental to local populations.
A new study finds that fewer than 250 fossils are required to train an image-based AI algorithm, a significant improvement on previously thought numbers. The discovery could greatly speed up the identification process in vertebrate paleontology, where most fossils are fragmented and difficult to analyze.
A new study reveals that ocean warming is driving a nearly 20% annual decline in fish biomass, with extreme marine heatwaves sometimes masking this trend. The research highlights the importance of international cooperation and long-term planning in fisheries management to address the ongoing rise in temperature.
A new study reveals that the presence of older fish accelerates bar loss in young tomato anemonefish, a process linked to social hierarchy and environmental adaptability. The researchers suggest this may be an insurance policy against invasion, with younger fish losing their bars as they are accepted into the group.
In 2025, global unprovoked shark bites returned to near-average levels, with a significant decrease in the United States. The country accounted for 38% of worldwide incidents, down from over 50% in recent years. Australia followed closely, with 32% of global bites and 56% of fatalities.
A study led by Flinders University found that white shark absences from South Australia's Neptune Islands were not solely driven by killer whale predation. The researchers recorded six prolonged absences over 12 years, with only one coinciding with killer whale presence.
Researchers discovered a unique photoreceptor cell that optimizes vision in low-light conditions, combining the benefits of both cone and rod cells. This finding has potential applications in developing more efficient cameras and medical treatments for eye conditions such as glaucoma.
Artificial light from coastal cities can alter melatonin levels in wild sharks, particularly resident species. The study found that nurse sharks exposed to higher artificial light had lower melatonin concentrations compared to darker environments.
Researchers found that warmer waters and commercial fishing lead to smaller meals for predators, resulting in reduced energy intake. This can weaken predators and make marine ecosystems more fragile. The study suggests managing climate change and fisheries together is essential to protect marine food webs.
A new study reveals significant differences in growth patterns between nurse sharks off the coast of Miami and those living just across the Gulf Stream. The research found that juvenile nurse sharks in Biscayne Bay grow more rapidly and reach smaller maximum sizes than their counterparts in Bimini, Bahamas.
Researchers at Florida Atlantic University have developed a patent-pending shark deterrent that can be used to reduce bycatch in fisheries. The device produces an electric field that repels sharks from bait without affecting target fish, and has been shown to reduce catches of coastal sharks by 62-70%.
Rebuilding coral reef fisheries can help fight global hunger and improve nutrition by increasing sustainable fish yields by nearly 50%. Countries with higher malnutrition indexes can benefit most from recovered reef fish stocks, which could provide enough servings for several million people annually.
Researchers recorded lemon sharks preying on jaguar cichlids, an invasive species introduced to Fernando de Noronha, in Sueste Bay. The bay's saltwater environment allows for the interaction due to freshwater inflows after heavy rains. This observation suggests that sharks may play a role in controlling invasive species populations.
A new deep-learning tool can rapidly identify wild and farmed salmon by analyzing fish scales, with 95% accuracy. This technology has the potential to mitigate the ecological impact of escaped farmed salmon on wild populations.
A team of international scientists reconstructed size evolution in ancient sharks using interdisciplinary analysis. The study revealed that modern sharks experimented with enormous body sizes much earlier in their evolutionary history than previously suspected.
Research found that deep-sea pelagic fish exhibit a wider range of body types, while benthic species tend towards elongated, tapered shapes. The study suggests that ocean depth and environmental conditions drive evolutionary changes in fish body shape.
A groundbreaking environmental DNA test developed by Florida International University scientist Diego Cardeñosa can detect traces of elusive hammerhead sharks in water samples. The test reveals fragments of genetic material left behind in the ocean, identifying areas where the sharks have been and informing conservation efforts.
Researchers observed orcas in the Gulf of California targeting juvenile great white sharks, flipping them to induce tonic immobility and extract nutrient-rich livers. The orca pod's hunting technique suggests advanced intelligence and social learning, allowing them to adapt to changing shark nursery areas.
A new study by University of Exeter researchers found that most sharks in UK waters survive catch-and-release fishing when angling best practices are followed. The study tracked the behaviour and survival of over 70 blue, porbeagle, and tope sharks caught in recreational fishing in the British Isles.
Researchers used global environmental DNA (eDNA) surveys to map marine fish species' geographic ranges. These findings highlight current biases in conservation efforts and ecological models.
Research found that sharks with specialized physiologies and ecological roles are most threatened with extinction. Losing these species would diminish trait diversity, leading to a more boring world with less diversity of forms. The study suggests that overfishing is the single biggest driver of shark population decline.
A recent study published in Integrative and Comparative Biology found that bonnethead sharks' skin undergoes significant changes as they mature, with younger sharks having fewer ridges on their denticles. These changes likely improve swimming performance and protect the skin from predators or injuries.
A new study on Ascension Island's shark troubles has found that human attitudes towards interactions with sharks can drive global decline in shark numbers. The research, conducted by the University of Exeter and ZSL, interviewed islanders about their perceptions of sharks and human-shark conflict.
A study found that 90% of marine aquarium fish sold by online retailers in the US come from wild populations, primarily in the western Pacific and Indian Ocean. The reliance on wild capture threatens coral reef ecosystems and puts endangered species at risk of extinction.
Thirty species of sharks, rays, and chimaeras are at risk due to deep-sea mining, which can harm their habitats and disrupt ecosystems. The study recommends establishing monitoring programs, creating protected areas, and including these species in environmental impact assessments to mitigate the risks.
Researchers will analyze genetic diversity and structure of four key sponge species to enhance resilience in restored populations. The project aims to build ecological resilience in vulnerable marine environments through a genetics-based approach.
A new study reveals that dried fish is an overlooked yet vital source of nutrition for millions of people across Africa, particularly for young children and women. The research found that even small portions of dried fish contribute significantly to recommended nutrient intakes for essential minerals like iron and zinc.
Researchers analyzed over 2,000 hours of underwater recordings to detect subtle shifts in red hind spawning behavior and population dynamics. The study found a notable shift in the balance of mating calls over the 12-year period, with calls linked to competition becoming dominant.
A new study reveals that 93% of shark meat products in the US are ambiguously labeled and may contain meat from critically endangered species. The findings highlight a need for stronger regulations and oversight of seafood labeling practices to protect consumers and conserve shark populations.
A new study reveals that sharks and rays adjust their growth and reproduction in response to changing food availability, affecting population growth and recovery. This flexibility makes it challenging to predict species' responses to pressures like overfishing and environmental change.
Male ghost sharks have a unique forehead appendage with retractable teeth, which are likely used to grasp females during mating. Genetic and fossil evidence confirms the teeth's origin from oral teeth, demonstrating an extraordinary example of tooth development and evolution.
Researchers at OIST identified biological processes that support young clownfish adaptation to climate change and warming seas. Exposing juvenile fish to raised water temperatures showed significant changes in liver and pancreas, reducing insulin secretion and increasing oxidative phosphorylation.
Research found that shark teeth become more brittle in acidic water, leading to increased breakage and potential loss of bite. The study suggests that sharks may struggle to adapt to changing ocean pH levels, which could have cascading effects on ecosystems.
A recent study found that 62% of whale sharks in the Bird's Head Seascape off Indonesian West Papua have scars and injuries from preventable human causes. Simple interventions, such as modifying traditional fishing platforms and boat designs, could greatly lessen this burden on the local population.
Researchers found that sharks' teeth become structurally weaker and more prone to break in acidic oceans. The study suggests that even small damage can have significant effects on these apex predators.