8,314 results
8,314 results for: Fish
- Animals
Pregnant—and Still Macho
Some of the basic theories of sexual behavior and sexual selection are getting attention thanks to a burst of new studies in the topsy-turvy social world of the seahorse, where the males get pregnant.
- Chemistry
Molecules Leave Their Mark
A material etched with tiny, carefully shaped pores can act like an artificial enzyme, cell membrane, or receptor.
- Chemistry
Sensor sniffs out spoiled fish
A new electronic nose detects amine compounds produced when fish decay.
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Fading to black doesn’t empower fish
Field studies of three-spined stickleback fish dash a textbook example of the theory of how one species can take on a competitor's characteristics.
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How whales, dolphins, seals dive so deep
The blue whale, bottlenose dolphin, Weddell seal, and elephant seal cut diving energy costs 10 to 50 percent by simply gliding downward.
- 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.
- Agriculture
Downtown Fisheries?
Advances may make fish farming a healthy prospect, even for inner cities.
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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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