Green fish in front of bottom of boat
The Deepwater Horizon Oil Spill’s Hidden Impacts on Mahi-Mahi      
Mahi-mahi were more likely to be eaten and less likely to spawn after being exposed to sublethal concentrations of oil, raising concerns about the risks oceanic drilling pose to life in the ocean.
The Deepwater Horizon Oil Spill’s Hidden Impacts on Mahi-Mahi      
The Deepwater Horizon Oil Spill’s Hidden Impacts on Mahi-Mahi      

Mahi-mahi were more likely to be eaten and less likely to spawn after being exposed to sublethal concentrations of oil, raising concerns about the risks oceanic drilling pose to life in the ocean.

Mahi-mahi were more likely to be eaten and less likely to spawn after being exposed to sublethal concentrations of oil, raising concerns about the risks oceanic drilling pose to life in the ocean.

fish
Drawing of fish with internal anatomy.
Researchers Visualize Heart From 380-Million-Year-Old Fish
Natalia Mesa | Sep 15, 2022
A team of researchers in Australia have imaged fossilized soft organs of early jawed vertebrates for the first time, finding that our ancient fish ancestors’ hearts, livers, and stomachs are strikingly similar to ours.
An Edith’s checkerspot butterfly
Genome Spotlight: Edith’s Checkerspot Butterfly (Euphydryas editha)
Christie Wilcox | Aug 25, 2022
A high-quality genome sequence for this versatile insect will likely aid eco-evolutionary research.
Chinook salmon swimming in the water
Probable Chlorine Exposure Kills 21,000 Fish at UC Davis
Catherine Offord | Aug 16, 2022
Threatened and endangered species were among the dead, likely poisoned overnight by a chlorination system used to decontaminate the animals’ tank water.
A yellow-orange, translucent artist's rendition of a yunnanozoan, an ancient wormlike fish, that highlights the arches that make up its cartilage skeleton.
This Simple Fish May Have Been One of the First Vertebrates
Dan Robitzski | Jul 7, 2022
A fossil analysis suggests that the yunnanozoan, a wormlike fish that flourished around 520 million years ago, sported structures that were the precursors of the head and jaws of modern vertebrates.
caged panels submerged underwater
How Rising Temperatures Affect Ocean Predation
Andy Carstens | Jun 9, 2022
A study yields insights into how predator-prey dynamics may shift with climate change, but many questions remain.
Archerfish in the deep transparent water.
Archerfish Defy Notion that Complex Vision Requires a Cortex
Amanda Heidt | Jun 1, 2022
The fish species is separated from mammals by hundreds of millions of years of evolution, yet its seemingly primitive brain can handle many of the same elaborate visual tasks.
A school of juvenile spiny chromis (Acanthochromis polycanthus)
Human-Made Noise Disrupts Fish Parenting
Christie Wilcox | May 23, 2022
The roar of nearby boat engines alters how fish care for and protect their young, resulting in fewer successful nests and smaller offspring, a study finds.
Giant manta ray swimming
Science Snapshot: Giant Manta Ray Sanctuary
Lisa Winter | May 20, 2022
Tourist photos help identify endangered manta rays and highlight the efficacy of recovery efforts at Komodo National Park.
Photo of fish in the Haemulidae family
Fish Are Chattier Than Previously Thought
Connor Lynch | May 2, 2022
Once thought to be silent, fish turn out to produce a range of vocalizations—so polluting the oceans with noise could pose a danger to them.
A tubifer cardinalfish
Genome Spotlight: Tubifer cardinalfish (Siphamia tubifer)
Christie Wilcox | Apr 28, 2022
These tiny reef fish harbor luminous bacteria, and the chromosome-level assembly of the species’ genome may facilitate the duo’s use as a vertebrate model for symbiosis.
illustration of yellow fish with red stripe down its back
Can These Fish Do Math?
Sophie Fessl | Mar 31, 2022
Scientists find that two species can be trained to distinguish quantities that vary by one.
An artistic rendering of a dinosaur fleeing a wall of water
Cretaceous Meteor That Killed Most Life on Earth Hit in Spring
Amanda Heidt | Feb 24, 2022
Researchers determined the season during which the meteor struck by studying the bones of fish excavated from a contentious field site.
goldfish in tank
Researchers Train Goldfish to “Drive”
Chloe Tenn | Jan 12, 2022
The Scientist spoke with cognitive neuroscientist Ronen Segev about how he taught goldfish to maneuver a moveable tank over land toward a visual target.
school of fish
Making Waves and Avoiding Beaks
Chloe Tenn | Dec 23, 2021
Moving collectively on the water surface could help protect schools of fish from being eaten by predatory birds.
The man-of-war fish (Nomeus gronovii), a species of medusafish, near the tentacles of a siphonophore.
Medusafishes Are Grouped by Shared, Odd Traits: Study
Devin A. Reese | Dec 1, 2021
Shared features, such as thick, slimy skin and a throat filled with teeth, suggest that medusafishes are all related.
A colorful mandarinfish on a reef
Genome Spotlight: Mandarinfish (Synchiropus splendidus)
Christie Wilcox | Oct 28, 2021
The high-quality genome sequence sheds light on the colorful nature of these popular aquarium fish.
view from below of hundreds of silver sardines swimming in the same direction
Famous South African Sardine Run Doesn’t Benefit Sardines: Study
Alex Billow | Oct 19, 2021
An analysis suggests that a commercially important mass migration of fish may have no real adaptive value.
dead fish piled in boxes along a pier, with a boat and snowy mountains in the background
Fish Poop a Big Player in Ocean Carbon Sequestration
Katarina Zimmer | Oct 8, 2021
A modeling study estimates that by drastically reducing fish biomass over the past century, industrial fishing may be affecting ocean chemistry, nutrient fluxes, and carbon cycling as much as climate change.
ABOVE: A pair of Labroides dimidiatus cleaner fish cleaning a puffer fish
Cleaner Fish Alter Behavior if Partners Can See Them “Cheating”
Chloe Tenn | Oct 7, 2021
A study of feeding behavior suggests the fish feed differently in front of their partners—a behavioral feature also found in primates.