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Tag: "fishes" at biology news

Farmed salmon could become an invasive species in forest streams

...ss the potential impact of farmed salmon on native fishes inhabiting streams on National Forest System lands and to learn if concerns from both sides of the farmed-versus-wild fish debate had validity, based on an extensive literature review. Here are some of the findings in the report: At present, ...

How fish species suffer as a result of warmer waters

... display wider thermal windows than, for instance, fishes from polar regions living at constant low temperat...stems. The paper 'Climate change affects marine fishes through the oxygen limitation of thermal tolerance' is published on January 5, 2007 in the scientifi...

Long-lived deep-sea fishes imperiled by technology, overfishing

...Oregon State University. "The harvest of deep-sea fishes is a lot like the harvest of old-growth timber," H...black cod ?are another depleted species. Deep-sea fishes grow slowly because of limited food sources and slower metabolisms and many don't reach sexual matur...

Twenty of world's 162 grouper species threatened with extinction

...rise one of the most valuable groups of commercial fishes in chilled fish markets of the tropics and sub-tro...ocus on over-fishing and conservation concerns for fishes in general,?said GMSA Director Kent Carpenter. The workshop identified the need to better protect...

Baby fish 'smell their way home'

...distinguish it from other reefs. "We think some fishes then choose currents that smell like 'home' and swim up them. The ones that cannot do this perish. The ones that get home preserve the unique 'ethnic' make-up of their tribe ?and so continue the process of evolving into separate new species." Ho...

Fish growth changes enhanced by climate change

...cial fishing. Dr Thresher said slower growth in fishes has been correlated with a variety of life history traits ?from higher mortality to reduced food availability and increased age or smaller size at sexual maturity. He said comparisons of historical and modern oceanographic data indicate temperatur...

Newly discovered fish named after New York aquarium biologist

...selle himself has discovered ?? fifteen freshwater fishes during his fourteen years of field work in Madagas...orld's experts on cichlids ?a family of perch-like fishes comprising nearly 2,000 different species. ...

How fish conquered the ocean

...University of Bergen, Norway have deduced how bony fishes conquered the oceans by duplicating their yolk-pro...ory. "The oceans have not always been filled with fishes as nowadays" says researcher Dr. Roderick Nigel Finn at the Department of Biology, University of Ber...

Microbes compete with animals for food by making it stink

...es could produce chemicals that prevented crabs or fishes from using these resources, then those microbes sh...eds of stone crabs, as well as other crab species, fishes and snails. Many more animals were attracted to the freshly thawed bait than the rotten fish. "S...

Batfish to the rescue!

...ctive to spear-fishers, while they depend as young fishes on coastal mangroves which are in decline in many areas. "Indeed, the resilience of inshore GBR reefs may be closely tied to the fate of mangroves and their suitability for batfish recruitment." Batfishes may be one of the last intact herbivore...

Mobile DNA part of evolution's toolbox

...ere LF stands for lobe-finned fishes--the group of fishes that gave rise to both the coelacanth and terrestrial vertebrates. The LF-SINE was very active in the evolutionary lineage leading to the terrestrial vertebrates, but much less active after animals moved onto land. Humans have 245 recognizable copi...

All the eggs in one basket

...o the animal food chain ?including commercial reef fishes ?reducing the protein-rich food available for the Caribbean people," say the researchers. When the hawksbill's numbers were larger they ate more toxic sponges. Now however, the results suggest the turtles are eating more non-toxic sponges. Accordin...

Even a little cooling helps after cardiac arrest

...into information on resident populations of birds, fishes and benthic invertebrates. "We think counting trematodes is an effective tool for assessing the biodiversity of salt marshes in California," Lafferty said. "We are interested in developing similar techniques for other ecosystems, such as coral reefs...

Researchers discover which organs in Antarctic fish produce antifreeze

...ver has no role in the freezing avoidance in these fishes at all." Instead, antifreeze glycoproteins (AFGP)...ajor AFGP synthesis site in Antarctic notothenioid fishes from hatching through adulthood, while the liver is AFGP-expression null in all life stages," the re...

How healthy is that marsh? Biologists count parasites

...into information on resident populations of birds, fishes and benthic invertebrates. "We think counting trematodes is an effective tool for assessing the biodiversity of salt marshes in California," Lafferty said. "We are interested in developing similar techniques for other ecosystems, such as coral reefs...

UF scientists discover evolutionary origin of fins, limbs

...ntually limb - locomotion, Cohn said. The earliest fishes lacked paired fins, similar to the modern-day lamprey - a species of jawless fish with a dorsal fin and tail but no side fins - considered by biologists to share many features with the ancestor of all vertebrates. "The emergence of paired appendage...

Convergent evolution of molecules in electric fish

...nvironment. The researchers found that electric fishes expressed one of the sodium channel genes in their electric organs only, while non-electric fish express both genes in their muscles. "Most fish have both genes in the muscle, but as the new electric organ was evolving, the sodium channel--by being ...

African amphibians make extreme parental sacrifice: The skin off their backs

...urator in the U-M Museum of Zoology. "Some cichlid fishes are known to provide their hatchlings with nutrition through skin secretions, but this does not include skin feeding." Earlier observations of another species in the same order of amphibians foreshadowed the latest discovery. In the 1990s, the same ...

Thin tough skin, slow-growing gills protect larval Antarctic fish

...s. "The way that we've understood how adult polar fishes survive has been based on their use of these antifreeze proteins to lower the freezing point of their internal fluids," said lead author Paul A. Cziko, a research specialist in the department of animal biology. "We finally got a chance to look at the...

Rare Chinese frogs communicate by means of ultrasonic sound

...our own," Feng said. "The electromagnetic sense in fishes and homing pigeons, polarized light vision in ants, chemical sensing of pheromones in insects and rodents, echolocation by ultrasound in bats and dolphins, are just a few examples. "That frogs can communicate with ultrasound adds to that list and re...

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