Use grasshoppers to grow fish

Homer TribuneAlaska spends more than $20 million on fish feed each year for its 35 salmon hatcheries — feed that comes primarily from anchovies caught in South America. Meanwhile, Alaska seafood processing companies produce more than 200,000 tons of fishmeal each year — for customers in Asia.Last year, 33 million fish — 20 percent of the total Alaska salmon harvest — originated in Read More…

Boat noise stops fish finding home

University of BristolBoat noise disrupts orientation behaviour in larval coral reef fish, according to new research from the Universities of Bristol, Exeter and Liège. Reef fish are normally attracted by reef sound but the study, conducted in French Polynesia, found that fish are more likely to swim away from recordings of reefs when boat noise is added.Sophie Holles, a PhD researcher at the Read More…

Study uses cutting-edge technology to genetically tag hatchery…

The Columbia Basin BulletinParentage-based tagging (PBT) is an emerging genetic-based fish tagging method that involves genotyping hatchery broodstock.PBT is a passive non-invasive approach to tagging because the parents, not the offspring, are genetically sampled at spawning, thereby “tagging” the offspring. This method provides the same information as traditional physical tags but also Read More…

Cattle grazing and clean water are compatible on public lands

UC Davis News and InformationCattle grazing and clean water can coexist on national forest lands, according to research by the University of California, Davis.The study, published today in the journal PLOS ONE, is the most comprehensive examination of water quality on National Forest public grazing lands to date.“There’s been a lot of concern about public lands and water quality, especially Read More…

Effects of predation pressure and resource use on morphological…

7th Space InteractiveBody shape is one of the most variable traits of organisms and responds to a broad array of local selective forces. In freshwater fish, divergent body shapes within single species have been repeatedly observed along the littoral-pelagic axes of lakes, where the structural complexity of near shore habitats provides a more diverse set of resources compared to the open-water Read More…

Scientists create a robot fish that can dive beneath water’s surface

UPIRobotics researchers in Singapore say their newest robot fish that mimics the movement of a carp could have a number of uses in marine environments.The robotic autonomous underwater vehicle could conduct underwater archaeology by exploring nooks and corners of wreckage or sunken cities, help lay undersea communication cable, or have a number of military applications, they said.Researchers at Read More…

Small fish’s predator perception makes a splash

Live ScienceSmall fish may have small brains, but they're not stupid. A common coral reef fish called damselfish can learn to avoid predators from more experienced kin, even in complete darkness, new research shows.Biologists have long known that fish use a variety of signals to warn others when predators approach, including visual cues, chemical cues, warning sounds and cues felt by motion. Read More…

Migrating animals linked to oxygen trends in oceans

FISThe oxygen content of the ocean may be subject to frequent ups and downs in a very literal sense — that is, in the form of the numerous sea creatures that dine near the surface at night then submerge into the safety of deeper, darker waters at daybreak.Research begun at Princeton University and recently reported on in the journal Nature Geoscience found that animals ranging from plankton to Read More…

How fish swim: Scientists reveal secret behind undulatory swimmers

Science World ReportFish are efficient swimmers, gliding through the water peacefully or quickly darting to escape predators. Yet actually finding out how they do it is more complicated than you might expect. Now, scientists have discovered exactly how fish swim, which may help develop biologically inspired machines that could cruise the world's oceans.Scientists have long looked to animals in Read More…

Certain cumulative environmental damage caused by small dams is worse…

The Columbia Basin BulletinResearchers conclude in a new report that a global push for small hydropower projects, supported by various nations and also the Kyoto Protocol to reduce greenhouse gas emissions, may cause unanticipated and potentially significant losses of habitat and biodiversity.An underlying assumption that small hydropower systems pose fewer ecological concerns than large dams is Read More…