8,270 results
8,270 results for: Fish
- Ecosystems
New protection for much-dogged shark
To rebuild northeastern U.S. populations of the spiny dogfish, the first fishing quotas on this species limit the harvest to roughly 10 percent of the 1998 haul.
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Do oxpeckers help or mostly just freeload?
A textbook example of mutualism—birds that ride around picking ticks off big African mammals—may not be mutually beneficial at all.
- Health & Medicine
New gene-therapy techniques show potential
Two technologies for transferring genes, one that uses mobile DNA called transposons and another that uses a weak virus, have proved successful in overcoming genetic disorders in mice.
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Dolphins bray when chasing down a fish
The first high-resolution analysis of which dolphin is making which sound suggests that hunters blurt out a low-frequency, donkeylike sound that may startle prey into freezing for an instant or attract other dolphins.
- Earth
Excreted Drugs: Something Looks Fishy
Drugs that the body can't fully use enter waste water, where they may affect aquatic life—or wind up in tap water.
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Brain wiring depends on multifaceted gene
A single gene may produce 38,000 unique proteins that guide the growth of the developing brain.
- Agriculture
Carnivorous fish nibble at farming gain
Fish farming may ease pressure on wild stocks overall, but for certain species, farms mean a net loss of fish.
- Health & Medicine
Darn that diet, anyway
Seemingly healthful foods—such as broiled chicken and baked fish—can contain high concentrations of compounds that may damage the cardiovascular system, and eating these foods can raise the concentration of these so-called advanced glycation end products in a person's blood.
- Chemistry
Lakes reveal low phosphate concentrations
Researchers using a new technique have found that previous measurements of phosphate, an important nutrient in lake ecosystems, have grossly overestimated its concentration.
- Earth
Methylmercury’s toxic toll
More than 60,000 children are born each year with neurodevelopmental impairments due to their prenatal exposure to methylmercury.
- Earth
Estrogen effects linger in male fish
Male fish can inappropriately make egg yolk protein, even when only intermittently exposed to water tainted with an estrogenic pollutant.
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Promiscuity in guppies has its virtues
Mating with multiple partners benefits the female Trinidadian guppy and her offspring by reducing gestation time and producing youngsters more adept at forming protective schools and at evading capture.
