Articles tagged with Marine Fishes
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.
Researchers have recorded the sliteye shark for the first time on the Great Chagos Bank, highlighting the ecological importance of the archipelago's Marine Protected Area. The discovery provides new insights into deepwater seagrass habitats and their role in supporting marine biodiversity.
Researchers captured unique footage of Indian Ocean seabirds catching flying fish in mid-air using lightweight cameras. The study showed that these birds exploit windy conditions to conserve energy while hunting, suggesting a possible adaptation to patchy food sources.
Despite using a large genetic dataset, scientists were unable to find a definitive explanation for the formation of distinct great white shark populations in the southern Indo-Pacific Ocean. A study published in Proceedings of the National Academy of Sciences suggests that genetic divergence began around 7,000 years ago.
A new study by the University of Miami Rosenstiel School of Marine, Atmospheric, and Earth Science reveals that deep-dwelling mesopelagic fish excrete carbonate minerals at rates comparable to shallow-water species. This finding validates previous global models suggesting that marine fish are major contributors to biogenic carbonate pr...
Researchers discovered a unique nanostructure in blue shark skin that produces their iconic blue coloration, which also suggests a potential capacity for color change. Tiny changes in guanine crystal spacing can alter the shark's body color to suit its environment.
A new international study reveals that Skagerrak likely serves as a nursery area for young Greenland sharks, contrary to common associations with Arctic waters. The research also confirms that newborn sharks are born in undisturbed deep-sea areas near the Mid-Atlantic Ridge, south of Iceland.
A study reveals that decades of overfishing have significantly altered the genetic composition of Eastern Baltic cod, leading to reduced growth rates and smaller sizes. The researchers found a correlation between slower growth and increased survival under high fishing pressure.
A comparative whole genome analysis of 240 fish species found a strong correlation between loss of the chorion-hardening system and parental egg-care. The team's findings suggest that the loss of key genes, such as alveolin, contributes to this evolutionary bias.
A study found that fish face a trade-off between tooth size and jaw mobility, restricting their ability to catch fast-swimming prey. Fish with larger teeth use rapid bursts of swimming to close in on prey, while those with extendible jaws rely on suction forces.
A global research team tracked over 100 species of marine animals, revealing key migration patterns and hotspots critical for conservation. The study, MegaMove, uses satellite data to inform a new blueprint for ocean conservation, highlighting the need for targeted mitigation efforts.
Researchers documented an unusual feeding aggregation of oceanic whitetip and tiger sharks scavenging concurrently on a carcass off the coast of Hawaii's Big Island. The study reveals that despite their different habitats, these shark species can peacefully coexist and establish a social hierarchy.
Clownfish have been shown to shrink in response to heat stress and social conflict, increasing their survival chances by up to 78%. The study also reveals that coordination with breeding partners is crucial for surviving heatwaves when shrinking.
Research shows fish species like Atlantic cod and hagfish contribute significantly to seabed ecosystem health. Bioturbation impacts on organic carbon storage and greenhouse gas absorption are crucial for understanding ocean's role in climate change.
A new study reveals the global distribution of FMFO factories, highlighting Peru's high production and potential environmental impacts. The study provides a starting point for addressing these issues through more transparent data, regulation, and sustainable practices.
Researchers found that some shark bites are motivated by self-defense when sharks feel threatened or provoked. This discovery challenges the common perception of sharks as mindless predators and highlights the importance of respecting their space.
A mysterious parasite is devastating fish farms globally, causing £50 million in losses annually. Researchers have discovered a new gene regulation process that could lead to the development of gene-based vaccines.
Marine turtles' shells exhibit complex trade-offs between toughness, stiffness and flexibility to protect against predators while optimizing movement. The shell's design accommodates demands of both survival and efficient locomotion in aquatic habitats.
A study reveals widespread overlap between feeding grounds for seabirds, marine mammals, and regions with high wind potential. Researchers propose developing risk maps to predict conflicts and recommend expanding marine protected areas and strengthening spatial planning tools.
A recent study published in the ICES Journal of Marine Science reveals that bigeye tuna, yellowfin tuna, and swordfish source between 50-60% of their diet from the twilight zone. This suggests that any changes to the twilight zone's food web could have profound implications for these fisheries.
Researchers studied the organs producing light in Vinciguerria mabahiss, finding they use photophores as counter illumination to break up silhouette and camouflage from predators. The fish produces blue light through a bacterial reaction, using reflective cells and a lens to direct it.
A new study found that the loss of Great white sharks from False Bay has triggered significant shifts in the marine food web. The absence of apex predators led to an increase in sightings of Cape fur seals and sevengill sharks, which coincided with a decline in species they rely on for food.
Scientists tracking great hammerhead sharks in the Bahamas have discovered that some individuals choose to stay at home, rather than migrate, due to the availability of resources and favorable environment. This finding provides crucial information for protecting the critically endangered species.