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Tag: "fish" at biology news

Vegetables inhibit growth of prostate cancer in mice with human tumors

...sses both consume a mixed diet of squid, fish, and fish eggs. Finkelstein analyzed nitrogen isotope ratios in the two species--an indicator of an animal's "trophic level," or how high it is on the food chain--and found no significant difference. "Biomagnification means that you get higher concentrations ...

Albatross study shows regional differences in ocean contamination

...sses both consume a mixed diet of squid, fish, and fish eggs. Finkelstein analyzed nitrogen isotope ratios in the two species--an indicator of an animal's "trophic level," or how high it is on the food chain--and found no significant difference. "Biomagnification means that you get higher concentrations ...

Fish on acid: Hagfish cope with high levels of CO2

... produced by the fish, which could explain why the fish is able to cope with environmental conditions of u...pid pH compensation than any marine or fresh water fish studied to date", explains Baker. Just as cold-blooded animals have an equal body temperature to th...

Pesticides in the nation's streams and ground water

...egan--were frequently detected in bed sediment and fish in urban and agricultural areas. Concentrations of these compounds in fish declined following reductions in their use during the 1960s and elimination of all uses in the 1970s...

Convergent evolution of molecules in electric fish

Having a set of extra genes gave fish on separate continents the ability to evolve elect...es, show that African and South American groups of fish independently evolved electric organs by modifying sodium channel proteins typically used in muscle ...

How to grow a bigger brain

...researchers at UC Davis. The brains of those young fish were closer to those of salmon reared in the wild, and the fish also showed behavior closer to wild than to hatchery-reared fish. "There's an obvious difference be...

Contaminants linked to sturgeon decline in Columbia river

...exact source of contamination," Schreck said. "The fish move, the stuff they eat moves and the water and s... input from numerous sources, so any population of fish at any one site can be exposed to a myriad of substances." The OSU researchers say it is difficult ...

Don't hold your breath: Carp can manage without oxygen for months

...The researchers have found that this extraordinary fish can change the structure of its gills to avoid bec...n supplies are limited. These mechanisms allow the fish to survive for days or even months without oxygen depending on the temperature, whilst still maintai...

One fish, two fish: New MIT sensor improves fish counts

...ace that could help definitively determine whether fish populations are shrinking. A remote sensor system...ch Laboratory, allows scientists to track enormous fish populations, or shoals, as well as small schools, over a 10,000-square-kilometer area - a vast impro...

Scientist warns of threat to last stronghold of endangered turtle

... up a number of agreements with African nations to fish their waters. Amazingly, most EU fishing concessions don't even incorporate compulsory bycatch monitoring programmes. Scientists from the University of Exeter's Cornwall Campus are working with a consortium of partners in Gabon (Aventures Sans Fron...

Resveratrol prolongs lifespan and delays onset of aging-related traits in a short-lived vertebrate

By studying a particularly short-lived fish species, researchers have been able to show that a...al trials in mice unaffordable. Recently, a small fish species with a captive lifespan of only three months was described by Cellerino and colleagues. In t...

UF scientists trace origin of shark's electric sense

...es and birds lost the sense over time, as did most fish alive today. But in sharks and a few other specie...mpreys, electrosensory capability endured. "Most fish you see today have large eyes," Coates said. "But sharks arepredators that do not particularly rely ...

Salk researchers make fast strides towards understanding how our body controls walking

... Lanuza, Ph.D. in Goulding's laboratory. Whether fish or fowl, the muscle contractions that allow us to move generally have certain rhythmic properties. It has been known for some time that a central pattern generator (CPG) ?specialized groups of neurons in the spinal cord ?functions as the control and ...

Uncovering sex-change secrets of black sea bass

...inently on many menus, but wild populations of the fish are in decline and their availability is limited. ...change into males more quickly." Some captive-born fish emerge as males even before reaching adulthood, devoting energy toward reproductive development and ...

UMaine teams with fishermen to study affects of trawling on seafloor ecology

... to levels seen 50 or 100 years ago. Small, bottom fish need complex habitat and it is clear that rock hopper gear reduces habitat complexity," said Watling. "No good habitat, hardly any fish." The good news is that recently protected habitats are recovering. While anything resembling a "natural" conditi...

Leave it to salmon to leave no stone unturned

...le, doesn't just affect future generations of that fish alone. "In streams with high densities of salmon, the disturbance from spawning impacts virtually all aspects of stream ecology," he says. The female salmon, of course, isn't concerned about all that. She simply wants to lay her eggs in a nice, gra...

New antimicrobial compound adheres to skin to promote healing

...eat burns. It was later applied to skin lesions on fish and other aquatic animals. Tricide works by enhancing the effectiveness of antibiotics. "In the case of burn victims, whether animal or human, bacteria and fungi can infect the open wounds and kill the patient," Ritchie said. "We have found a way t...

Exotic crab poised for widespread UK invasion

...abs. Measures which are currently used to monitor fish in our rivers, such as the electrical fish counters, could also be adapted to include monitoring of mitten crabs." Mitten crab facts: The c...

Lizard 'third eye' sheds light on evolution of color vision

...imals and ours. It turns out that some frogs and fish also have a spot on their foreheads that might play the role of a light-sensing third eye. Yau hopes to pursue these structures to obtain more clues about how our photoreceptor cells, the rods and cones, came about. As he says, he's most curious abou...

How marine reserves are giving coral reefs a helping hand

...ay be no surprise that marine reserves protect the fish that live in them, but now scientists from the Uni...arrotfish as the main grazer of reef surfaces. The fish use their teeth to remove seaweed from the reef which allows new corals to settle and grow.This graz...

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