Repeat spawning comes with tradeoffs for trout

Purdue University – Steelhead trout that spawn multiple times have more than twice the lifetime reproductive success of single spawning trout, suggesting there is a substantial benefit associated with repeat spawning. But it comes with a tradeoff, according to new research published in Proceedings of the National Academy of Sciences. Repeat spawners make the dangerous journey from the Read More…

Estuaries may experience accelerated impacts of human-caused CO2

Science Daily – Rising anthropogenic, or human-caused, carbon dioxide in the atmosphere may have up to twice the impact on coastal estuaries as it does in the oceans because the human-caused CO2 lowers the ecosystem's ability to absorb natural fluctuations of the greenhouse gas, a new study suggests. Researchers from the U.S. Environmental Protection Agency and Oregon State University Read More…

What Sound Does A Fish Make? Scripps Scientist Wants To Know

KPBS – While a two-year-old can probably tell you what sound a dog or a cat makes, she might be stumped if you ask, what sound does a fish make? But that is what Ana Širović, an oceanographer at the Marine Bioacoustics Lab at Scripps Institution of Oceanography, is trying to find out. "Everybody knows that whales make sounds, that seems to be common knowledge, but usually when I tell Read More…

Self-driving robots collect water samples to create snapshots of…

Science Daily – For the first time, scientists from the University of Hawai'i at Mānoa (UH Mānoa) and the Monterey Bay Aquarium Research Institute (MBARI) will deploy a small fleet of long-range autonomous underwater vehicles (LRAUVs) that have the ability to collect and archive seawater samples automatically. These new robots will allow researchers to track and study ocean microbes in Read More…

Deep-sea fish genotype affects habitat choice, new research reveals

FIS – A team of scientists has found evidence of natural selection in a deep-sea fish species adapting to the depth of ocean that it inhabits. To reach this conclusion, these researchers, led by Professor Rus Hoelzel in Durham University's (UK) Department of Biosciences together with collaborators from the Department of Earth Sciences in Durham, the University of Liverpool and Marine Read More…

Triplefin fish found to have controlled iris radiance

Phys Org – A team of researchers with the University of Tübingen in Germany has found an example of a fish that is able to control light reflected from organs next to its pupils—a form of photolocation. In their paper published in the journal Royal Society Open Science, the group describes their study of the fish and their findings and also offers some theories on the purpose of the Read More…

Newly-hatched salmon use geomagnetic field to learn which way is up

Phys Org – Researchers who confirmed in recent years that salmon use the Earth's geomagnetic field to guide their long-distance migrations have found that the fish also use the field for a much simpler and smaller-scale migration: When the young emerge from gravel nests to reach surface waters. The study is published in the journal Biology Letters. The findings have important implications Read More…

Despite odds, fish species that bypasses sexual reproduction is…

Washington University School of Medicine – The very rare animals that reproduce asexually — only about one in 1,000 of all living vertebrate species — are thought to be at an evolutionary disadvantage compared with their sexually reproduced counterparts. But that theory doesn’t hold true regarding the Amazon molly, an all-female fish species that has thrived for millennia in the fresh Read More…

Dams drive risk of fish extinction in the U.S.

Phys Org – Dams drive local extinction risk of native fish in the southern United States, according to a study by Florida International University. The high number of dams built close to each other in the southeast significantly limits where fish can move throughout their lives, driving the risk of extinction for native fish in some areas, according to a study led by FIU ecologist John Read More…

Walking fish suggests locomotion control evolved much earlier than…

Science Daily – Cartoons that illustrate evolution depict early vertebrates generating primordial limbs as they move onto land for the first time. But new findings indicate that some of these first ambulatory creatures may have stayed under water, spawning descendants that today exhibit walking behavior on the ocean floor. The results appear February 8 in the journal Cell. "It has Read More…