Crustaceans

Newly discovered microbial world helps protect developing lobsters

Consumers willing to pay more for lobster harvested with ropeless technology, UMaine study finds

How tiny cave shrimps power the underworld of the Yucatan

A recent study reveals that tiny cave shrimps, specifically the Typhlatya genus, play a crucial role in maintaining the unique food web of anchialine caves in the Yucatan Peninsula. The shrimps convert microbial growth into animal biomass, introducing essential nutrients into the ecosystem.

Mangrove crab outruns its namesake in climate-driven coastal shift

A study reveals that Atlantic mangrove fiddler crabs are settling into temperate salt marshes along the southeastern US coast due to climate change. The species is expanding its range northward, with some populations reaching as far as South Carolina, and may soon spread to North Carolina.

A new crab is settling in the Mediterranean: Early evidence of establishment of a Lessepsian species in the Ionian Sea

A new study documents the rapid expansion of the Indo-Pacific crab Gonioinfradens giardi in the Ionian Sea, indicating a shift from sporadic occurrence to stable populations. The species' establishment raises concerns about its ecological role and interactions with native species.

Cannibalism takes major bite out of young blue crabs, but the shallows offer a refuge

A 37-year study by the Smithsonian Environmental Research Center found that cannibalism is the primary killer of juvenile blue crabs in mid-salinity waters. However, young crabs can escape predation by migrating to shallow waters, where they are safer from adult crabs and other predators.

Scalable aquaculture systems can improve survival, reduce labor, and enhance animal welfare

The Okinawa Institute of Science and Technology (OIST) has developed a scalable aquaculture platform that automates early-life stages, minimizing pathogen exposure and animal stress. The system uses light and flow-guided systems to improve survival rates and reduce labor input.

Study shows marine plastic pollution alters octopus predator-prey encounters

A study published in the Journal of Experimental Marine Biology and Ecology found that exposure to oleamide, a chemical additive in plastics, caused immediate changes in octopus prey choice and interactions with predators. The effects persisted for at least three days, suggesting a lasting impact on marine behavior and ecosystem dynamics.

Oysters play unexpected role in protecting blue crabs from disease

New research reveals oyster filter feeding significantly reduces transmission of deadly Hematodinium perezi parasite in Chesapeake Bay's juvenile blue crabs. Oysters eliminated over 60% of parasites within an hour, reducing infection risk by one-third.

Imaging reveals bacterial symbionts in the ovaries of tiny, aquatic crustaceans

A team of scientists has imaged bacterial symbionts inside the ovaries of tiny crustaceans, discovering that these bacteria manipulate host reproduction and are transmitted from mothers to offspring. This finding provides a unique model for studying endosymbiosis in an aquatic arthropod.

A new pink sea anemone that “builds a home” for hermit crabs discovered off Japan’s deep-sea coast

A new species of sea anemone has been discovered building shell-like homes for hermit crabs. The anemone secretes a carcinoecium that expands and reinforces the crab's shell, forming a mutualistic relationship between the two species.

Warming oceans may pose a serious threat to American lobsters

Research suggests that American lobsters are more resilient to ocean acidification than previously thought, but they are highly sensitive to heat stress. The study found that warmer water led to faster embryo development, but smaller larvae with decreased survival prospects in the wild.

A new species of shrimp found on Sugashima Island, Japan

A new species of the genus Leucothoe was identified on Sugashima Island, Japan. The discovery was associated with a specific type of limid bivalve, highlighting the unique biodiversity found in this region.

Study challenges theory behind N.C. blue crab decline

Researchers from North Carolina State University found that juvenile blue crab populations remained stable in Pamlico Sound during both pre- and post-fishery decline periods, challenging the theory of recruitment overfishing. The study suggests a potential population bottleneck for crabs post-nursery but pre-maturity.

FAU awarded US EPA grant to integrate genetics in Florida bay sponge restoration

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.

An ancient signpost: Minute fossils tell big story about arthropod evolution

A tiny fossil of a sea creature from over half a billion years ago sheds light on the evolution of arthropods, revealing a brain similar to that of living crustaceans. The discovery suggests that the split between the two largest groups of arthropods was more nuanced and complicated than previously thought.

A new shrimp roommate

Researchers from Kyoto University discovered a new shrimp roommate, Betaeus levifrons, living in Japanese mud shrimp (Upogebia major) burrows on the Pacific coast of Hokkaido. This symbiotic relationship highlights the unique ecological and evolutionary processes underlying these interactions.

Connecticut College study finds fungus metabolites may help ghost shrimp survive

A Connecticut College study found that fungus metabolites may boost the survival of ghost shrimp in freshwater ecosystems. The study showed a 48% lower mortality rate and altered behavior among shrimp exposed to these byproducts.

Robot crab reveals how males compete in claw-waving contest

Scientists studied male fiddler crabs competing over females in a claw-waving contest. The robot crab, Wavy Dave, waved its claw, causing real males to respond by waving longer and less retreating into their burrows.

Tiny fossil suggests spiders and their relatives originated in the sea

A new analysis of a 500 million-year-old fossil suggests that arachnids, including spiders and scorpions, evolved in the ocean before adapting to land. The discovery was made by studying the brain and nervous system of an ancient marine arthropod called Mollisonia symmetrica.

Antimicrobial resistance genes hitch rides on imported seafood

Researchers identified colistin-resistance genes in imported shrimp and scallops, highlighting the risk of antimicrobial resistance spread through food imports. The study's findings emphasize the need for global monitoring systems to combat this growing public health threat.

New copepod species highlights fragile biodiversity in Bermuda’s caves

Scientists have discovered a new copepod species, Tetragoniceps bermudensis, in Bermuda's cave system, revealing the fragile biodiversity of this unique ecosystem. The finding suggests limited geographic range and probable endemic status for the species.

The kids are hungry: Juvenile European green crabs just as damaging as adults, WSU study finds

Researchers at Washington State University discovered that juvenile European green crabs can cause significant damage to shellfish, native eelgrass, and the ecosystem. The study found that even young crabs can crack into immature shellfish with ease, challenging current removal techniques.

Love songs in the sand: researchers listen in to Fiddler crab courtship

Fiddler crabs use vibrational signals to communicate during courtship, and a new study reveals that signal features are influenced by the male's claw size. Researchers found that males with larger claws produce higher-energy signals, allowing females to assess their quality from afar.

Study explores effects of climatic changes on Christmas Island’s iconic red crabs

A new study by the University of Plymouth investigated the effect of changing global climate conditions on Christmas Island's red crab embryos. The researchers found that lower salinity levels did not delay embryonic development, but emphasized the need for further research to understand the species' response to environmental stressors.

Urban environments promote adaptation to multiple stressors

A study investigating aquatic species response to environmental stress factors in urban habitats reveals populations adapt and become more resilient. This finding supports the hypothesis that urban habitats provide clues about animal adaptation to future environmental changes.

Chameleon shrimp can camouflage themselves even in invasive species of algae, study shows

Researchers have discovered that chameleon shrimp can disguise themselves in exotic algae from other oceans, regardless of their evolutionary history. The crustaceans prefer to hide in invasive species with complex structures that offer better protection from predators.

UMaine-led team develops more holistic way to monitor lobster industry

A University of Maine-led team has developed new socioeconomic indicators to holistically monitor the Maine lobster industry's resilience. The indicators, published in Marine Policy, cover coastal accessibility, operational condition, business investments, and other key components of the industry.

The Dark Side of the ocean: New giant sea bug species named after Darth Vader

A new species of giant isopod, Bathynomus vaderi, has been discovered in Vietnamese waters, reaching lengths of up to 32.5 cm and weighing over a kilogram. The species was named after Darth Vader's iconic helmet and has become an expensive delicacy in Vietnam.

Microplastics widespread in seafood people eat

Researchers found 1,806 suspected particles across 180 samples of Oregon's marine and freshwater species. Pink shrimp had the highest concentrations, while Chinook salmon had the lowest. The study highlights a need for technologies to reduce microfiber pollution entering the environment.

National TRAP Program funds large-scale cleanup of discarded fishing gear

The National TRAP Program has awarded $1.4 million to fund 11 projects in nine US states and Palau to remove derelict fishing gear from coastal waters. This initiative aims to standardize data collection practices and establish a national database to evaluate the environmental and economic impacts of these efforts.

Woods Hole Oceanographic Institution and partners discover new ocean predator in the Atacama Trench

Researchers from Woods Hole Oceanographic Institution and partners uncover a fast-swimming predatory amphipod species at depths of up to 8,000 meters. The newly discovered species highlights the importance of continued deep-ocean exploration and biodiversity discoveries in the Atacama Trench.

Brain test shows that crabs process pain

Researchers at the University of Gothenburg have conducted a groundbreaking study on shore crabs, revealing that they possess pain receptors and neural reactions in response to painful stimuli. The findings provide conclusive evidence for the existence of pain in crustaceans, highlighting the need for more humane treatment methods.

Big shifts from tiny players: How climate change could disrupt Arctic ecosystems

Researchers explored how future changes in the North Water Polynya could impact marine communities. Changes in plankton and fish populations were found to have significant effects on the entire ecosystem. Polar bear numbers are projected to halve due to declining phytoplankton and copepods.

Crustacean with panda-like coloring confirmed to be a new species

A new species of crustacean with unique black-and-white coloring, resembling a panda, has been discovered in Japan. The Melita panda was found in intertidal waters and is closely related to other amphipods with distinct physical characteristics.

American lobster population, habitat preferences shifting, study finds

A study by University of Maine researchers found that American lobster populations are relocating to new habitats, while their numbers are dwindling in abundance. The lobsters are now favoring open spaces over rocky shelters, with a significant increase in those living without shelter at all.

Pharmacology: Venomous crustacean from Mayan underwater caves provides new drug candidates

A study from Goethe University Frankfurt reveals that venomous crustaceans, specifically remipede crabs in Mexican cenote caves, contain a variety of toxins with pharmacological potential. The xibalbines peptides effectively inhibit potassium channels and activate signaling pathways involved in pain sensitization.

Even marine animals in untouched habitats are at risk from human impacts

A new study of 21,000 marine animals reveals that even pristine habitats are at risk due to human activities and climate change. The research highlights the impact of cumulative human stressors on global marine fauna, emphasizing the need for targeted conservation efforts.

How does a tiny shrimp find its way home in a vast ocean? Study finds it’s down to their cave’s special smell

A new study reveals that possum shrimp rely on distinctive chemical cues from their underwater caves to find their way back. Researchers found that each cave had a unique water-borne odor bouquet, which helped the shrimp navigate between them.

Study offers hope for the resilience of the American lobster fishery

A recent study by researchers at the Virginia Institute of Marine Science found that female American lobsters groom their offspring without significant impact from temperature and acidity levels forecasted for Maine's coastal waters. This behavior is crucial in other crustaceans, but its importance for the lobster species remains uncle...

U.S. capable of achieving seafood independence, new study shows

Researchers found the US can meet its entire seafood demand through domestic production, but current exports and imports limit self-reliance. Increasing consumption of lesser-exported species like herring and anchovy could strengthen the domestic supply and contribute to a more sustainable food system.

Historic map reveals how mussel farm is bringing shellfish reefs back to the seabed

A UK-based study reveals that an offshore mussel farm is reviving shellfish reefs off the English south coast, a process previously unseen in 150 years. The research found mussels deposited on the seabed create habitats for commercially important species like European lobsters and brown crabs.

Climate change may lead to shifts in vital Pacific Arctic fisheries

Climate change is expected to shift the distribution of eight commercially important marine fish and invertebrate species northwards due to warmer water temperatures and loss of sea ice habitat. This could lead to changes in the abundance and economic viability of fisheries, with some species potentially benefiting while others decline.

Australian bushfire ash is deadly for aquatic life

Research reveals wildfire ash can have devastating consequences on Australian water ecosystems, affecting both terrestrial and aquatic organisms. The study found that two common crustacean species had varying levels of sensitivity to ash concentrations, with some unable to survive even low doses.

Is magnesium the sleeping potion that enables sandhoppers to survive cold winters?

A new study found that magnesium levels in sandhoppers increase during cold weather, slowing their activity. In deeper sleep, magnesium levels can more than double, putting the sandhopper into a torpid state and allowing it to conserve energy.

Biodiversity in crabs: more than counting species

A study by LMU researchers reveals that crab diversity is more complex than species numbers alone. The team found greater variety in shield shapes among 'false' crabs, which are related to their ecological roles.

How do genetically identical water fleas develop into different sexes?

A team at Osaka University uses novel RNA sequencing techniques to reveal the molecular basis for sexual dimorphism in Daphnia, a species of water flea that can change its form and behavior despite being genetically identical. The study identifies genes that switch which isoforms are expressed in a sex-dependent manner.

Fixin’ to be flexitarian: Scrap fish and invasive species can liven up vegetables

A new study suggests that incorporating seafood rich in umami, such as fish and shellfish, into vegetable dishes can boost their flavor and make them more appealing. The research uses a mathematical equation to calculate the umami content of various seafood options, finding that even small amounts can greatly enhance the taste.

PFAS exposure from high seafood diets may be underestimated

A Dartmouth-led study found that people in New England, particularly those who frequently consume seafood, face an increased risk of PFAS exposure. The researchers recommend setting safety standards to limit seafood consumption and highlight the need for more stringent public health guidelines.

Crawfish could transfer ionic lithium from their environment into food chain

Researchers found that crawfish can accumulate high levels of toxic lithium in their bodies, which can be passed to humans through the food chain. The study highlights the potential risks of lithium contamination in the environment and emphasizes the need for responsible disposal practices.

Shrimp waste revolution: unlocking potent antioxidants for health and sustainability

Researchers discovered novel compounds in shrimp by-products offering promising health benefits, including anti-inflammatory, anticancer, and anti-aging properties. The study highlights the potential of converting seafood waste into valuable health-promoting agents, promoting sustainable seafood processing.

Tiny crustaceans discovered preying on live jellyfish during harsh Arctic night

Scientists have discovered that tiny crustaceans, such as amphipods, prey on both living and dead jellyfish during the Arctic polar night. The study, published in Frontiers in Marine Science, found that these crustaceans shift to an omnivorous diet during this period, utilizing jellyfish as a key food source.

As sea otters recolonize California estuary, they restore its degraded geology

A study reveals that sea otter reintroduction has slowed creekbank erosion by up to 90% and restored marsh stability despite rising sea levels and pollution. The researchers suggest that this phenomenon can have far-reaching benefits for ecosystems worldwide, overturning the traditional bottom-up paradigm of coastal geomorphology.

Study identifies priority areas for conservation of endangered crustacean in Brazil

The study identifies Morro do Príncipe as a priority area for conservation of the endangered Johngarthia lagostoma land crab in Brazil. Praia dos Andradas is also considered vital for breeding. The researchers highlight the importance of preserving vegetation to ensure the species' survival.

TTUHSC researcher studies the ability of brine shrimp to thrive in high salinity

A research team at Texas Tech University Health Sciences Center discovered a unique sodium pump variant in brine shrimp that enables them to thrive in high-salinity environments. This NKA variant uses more energy than common variants, allowing the animal to maintain steeper Na+ gradients.

Allergic responses to common foods could significantly increase risk of heart disease, cardiovascular death

A new study finds that people with antibodies to common foods like dairy and peanuts are at a higher risk of cardiovascular-related death. The research suggests that these subtle immune responses may lead to inflammation and contribute to heart disease over time.

Researchers reveal true crabs’ epic ancient odyssey from sea to land and back again

Researchers discovered that true crabs have left the marine environment up to 17 times over the past 100 million years, with most species able to survive in semi-terrestrial habitats. The study's findings provide insights into convergent evolution and the adaptation of crabs to life on land.

How do caterpillars acquire chubby legs: NUS scientists trace the origins to an ancient genetic program associated with crabs

Researchers from NUS discovered that caterpillars' prolegs are derived from a genetic program that specifies lobes originally found in crustaceans. This novel trait is reactivated in the abdomen of caterpillars, enabling them to grasp and move on various surfaces.

Consistent metabolism may prove costly for insects in saltier water

A new study from North Carolina State University finds that freshwater insects lack metabolic responses to salinity, unlike other aquatic animals like crustaceans and snails. Insects' constant metabolism in saline environments may be due to low demand for calcium, which can be toxic to them.

Accounting for oxygen in modeling coastal ecosystems

Researchers say current models fail to project oxygen dynamics in coastal ecosystems with high photosynthetic activity, such as seagrass meadows and coral reefs. Fluctuations in oxygen levels have been observed in systems like the Venice Lagoon and Red Sea coral reefs, where marine species adapt to changing conditions.