Sentences with phrase «by predator fish»

Also, the rocks must be piled deep enough to form crevices that protect eggs from being washed downstream or consumed by predator fish.

Not exact matches

«Fish and Wildlife told me that the 1080 I'd sent to three predator - control boards in Wyoming was not being used by Government trappers at all,» Allen says.

But the groups formed by those guppies were on average smaller than the groups formed by the fish that were not exposed to predators.

Researchers now find that certain male fish solve the problem by wooing females with secret ultraviolet signals their major predators can't see.

Off the List Thanks to repopulation efforts during the past few decades, the gray wolf (Canis lupus) now thrives in the U.S., and since 2003 the U.S. Fish and Wildlife Service has been trying to move the top predator off the endangered species list — a plan opposed by groups that believe the wolves are susceptible to being overhunted [see «Out of the Woods»; SciAm, April 2003].

As naturalists have long recognized, this tendency is cunningly exploited by reef fish, which evolved bold colored splotches that «break» their outlines and confuse predators seeking continuous contours.

Despite the seemingly large number of tiny fish that fishermen and regulators thought were going to waste, the number was small compared to death by non-human predators and lack of plankton and other food sources.

Later on, when the sea anemones grow big and become predators themselves, their venom adapts to their new lifestyle by producing a different kind of toxin, one best suited to catch small fish and shrimp.

PAHs could stunt growth, an effect that could ripple through the ecosystem: smaller organisms are picked off by predators at a young age, leaving less food for larger fish such as red snapper and bluefin tuna.

These animals have declined as their habitat has been destroyed, they've been caught up in fishing gear, their nesting areas have been disturbed and raided for their eggs, they've ingested plastic pollution and they've been hunted by people and predators.

Research conducted by Dr Bill Dew at the University of Lethbridge in Canada looked for the first time at the effect of the metal contaminants nickel and copper on specific fish olfactory sensory neurons, and how these affect the fish's ability to detect and swim away from an odour released by other fish of the same species (conspecifics) when a predator attack takes place.

Prized by diners for its tasty white flesh, the yard - long lingcod is a voracious predator that ambushes other fish among the submerged rock pinnacles and kelp thickets of Prince William Sound.

Long has used Tadros to study the evolution of backbones, testing the idea that by making ancient fish stiffer, backbones made them faster and hence better at collecting food or evading predators.

In many places, these smaller fish are suitable for eating, but off southwestern Africa and other places, the predators were replaced by undesirable fish.

A novel research approach by Oregon State University has resulted in a key step toward better protecting the fisher, an important forest predator that findings show is the dominant small carnivore when present.

Instead, blenny venom causes the victim's blood pressure to plunge by almost 40 % for a short time, which in the wild might slow down a would - be predator (like grouper fish) long enough for the tiny blenny to escape.

Atwood and her team tested the idea in Canada and Costa Rica by temporarily removing fish and insect top predators from ponds, streams and tiny wet ecosystems associated with bromeliad plants.

The species singled out by the recent FDA advisory — big predators such as albacore tuna, shark, and swordfish — can have 100 times more mercury in their tissues than smaller fish do.

After being absorbed by plankton, the mercury moves up the food chain: The plankton is eaten by small fish, which are then gobbled up by larger predators, each bigger animal accumulating more mercury with every meal.

Animals from waters with guppy - hungry predators aged more slowly than did fish from pools cut off from predators by waterfalls — an apparent contradiction of the classical theory.

Instead, the large reductions in fish urine were driven by the reduction of large - bodied fish and predator fish such as grouper, snapper or barracuda that occurs through selective fishing practices.

Blenny fish venom most likely causes a sudden drop in blood pressure in would - be predators, such as grouper fish, that have been bitten by blennies, researchers report on March 30 in Current Biology.

The study by Australian and American scientists, conducted in naturally occurring carbon dioxide seeps in Papua New Guinea's Milne Bay, found an acidic environment made reef fish become attracted to the smell of their predators.

These fish species are often termed marine forage fish because they are preyed upon by larger predators including larger fish, seabirds and marine mammals.

The named fish may contain more mercury than other species because they are long living fish and / or predators and can accumulate higher levels of mercury by eating other fish.

It's part of a three - year Fish and Wildlife Service - funded effort to estimate the number of birds killed by predators, chemicals and in collisions with wind generators and windows.

The main purpose of small woody debris on Redwood Creek is to give adequate space for small fish to remain undetected by aerial predators and provide cooler temperature waters away from direct sunlight.

They also stage a shark feed that draws dozens of gray reef and blacktip sharks, as well as clouds of reef fish, which dart about gobbling up the scraps missed by the big predators.

Most fish caught by fishermen on reefs need this important habitat to grow up in, safe from predators and with a good food supply.

Due to open variables such as growth rate and maximum age, the impact of accidental fishing, commercial fishing and death by predators or pollution is yet to be fully discovered.

The show's title is inspired by a very specific emergent phenomenon, «neuromast,» which is the sensory organ that allows fish to effectively behave in unison against the threat of predators.

The groups, Oceana and WildAid, released a report today online that consolidates several recent studies showing that many shark species, after hundreds of millions of years of roaming the seas as a dominant predator, are being fished out of existence by the new king of the sea: people.

A healthy unfished reef is inhabited by top predators like sharks and grouper and total fish biomass is roughly 500 grams per square meter.

Many steps up the food chain later, predators like tuna receive methylmercury from the fish they consume... it appears the recent mercury enrichment of the sampled Pacific Ocean waters is caused by emissions originating from fallout near the Asian coasts.

A relative lack of tourism in northern Cyprus has been a boon to turtle populations, which are threatened by development and beach erosion, as well as predators, marine trash, and getting caught in fishing nets.

These predators typically eat small fish, crabs and mussels, which they capture by stinging them.