Sentences with phrase «many predatory fish»

Research from Dalhousie University suggests that given just 15 years, a modern industrialized fishery can reduce the biomass of large predatory fish communities by 80 %.

If you're concerned about excessive mercury intake, you can minimize the chances by avoiding predatory fish, such as pike, marlin, mackerel, tilefish and swordfish.

But some types of seafood — particularly large, predatory fish such as shark, swordfish, king mackerel and tilefish — can contain high levels of mercury.

The largest predatory fish on the planet inspired Steven Spielberg's movie Jaws, which sealed the shark's image as a man - eater.

Tangles of fishing line caught in the corals are a testament to the fishermen's persistence, and the bodies of predatory fish hanging in the market leave little doubt as to where some of the fish are going.

One particularly interesting question was if and how this behavior would change in the presence of the predatory fish.

Pike is a widely distributed, long - lived and large keystone predatory fish species that breeds annually after becoming mature.

That goes for every large predatory fish: sharks, tuna, sailfish, cod... It's only through fishing that we have any idea how many fish are out there.

From fishery records, however, primarily Japanese longline [fishing] records, scientists [have] realized that about 90 percent of all big predatory fishes are gone.

Pyenson et al. report that the site, Cerro Ballena, dates to the Late Miocene period and consists of over 40 skeletons of marine vertebrates, including rorqual and sperm whales, seals, predatory fishes, and fascinating, now completely extinct, species such as walrus - whales and aquatic sloths.

Swordfish are large, highly migratory, predatory fish characterized by a long, flat bill in contrast to the smooth, round bill of the marlins.

Triassic Neopterygii primarily developed small species while the majority of the more basal ray - fins produced large predatory fish.

Pollution may soon overwhelm deep seas» ability to sequester mercury, which builds up in tuna and other predatory fish

This is the story of one of the winners, a small, shell - crushing predatory fish called Fouldenia, which first appears in the fossil record a mere 11 million years after an extinction that wiped out more than 90 percent of the planet's vertebrate species.

Shark populations are plummeting, and since these predatory fish mature slowly and reproduce infrequently, their dwindling numbers aren't likely to rebound quickly, if at all.

The compound might help the animal defend against predatory fish, or it might actually be produced by symbiotic microbes living on the creature's surface.

Threespot Damselfish populations have exploded in recent years due to overfishing of predatory fish such as groupers and snappers.

Spawning heavily and putting on weight rapidly, Asian carp soon grow too big for native predatory fish to take on.

Crustaceans, mussels and predatory fish as well as many smaller organisms that are important for the Baltic Sea ecosystem thrive in submarine Fucus forests.

Swiss and U.S. American researchers led by the Paleontological Institute and Museum of the University of Zurich have discovered the fossil remains of one of the earliest large - sized predatory fishes of the Triassic period: an approximately 1.8 - meter - long primitive bony fish with long jaws and sharp teeth.

Predatory fish are extremely important for maintaining a balanced ecosystem on the Great Barrier Reef.

Now researchers from the ARC Centre of Excellence for Coral Reef Studies (Coral CoE) at James Cook University have found that removing predatory fish such as coral trout and snapper, through fishing, causes significant changes to the make - up of the reef's fish populations.

Last May biologists at Dalhousie University in Halifax, Nova Scotia, reported that global stocks of large predatory fish have declined by 90 percent since industrial fishing began in the mid-1950s.

«Predatory fish are extremely important for maintaining a balanced ecosystem on the reef, yet predators such as coral trout, snapper and emperor fish remain the main target for both recreational and commercial fishers,» she says.

«A stable and healthy reef includes a high abundance and diversity of predatory fish and a relatively low number of herbivorous and small prey fish,» says study lead author April Boaden, a PhD student at the Coral CoE.

The small crustaceans, which dine on parasites that infest large, predatory fish, use the dance to attract customers.

«Predatory fish have more difficulty catching larger prey with spiny fins and have problems swallowing them.

In the new study, Becker's team observed the interactions between cleaner shrimp and various species of parasite - laden predatory fish in the wild.

Large predatory fish were also few and far between.

The ~ 242 million year old predatory fishes were found in the fossil Lagerstätte Monte San Giorgio, in Ticino.

The fossilized food remains of the extinct predatory fish Saurichthys reflect its spiral - shaped intestine.

The sardines, in turn, were consumed by everything from seabirds and sea lions to predatory fish like the mackerel.

Dunkleosteus grew up to 33 feet long and was the largest of a group of armor - plated predatory fish, the placoderms.

Saurichthys is a predatory fish characterized by a long thin body and a sharply pointed snout with numerous teeth.

But this was only because, with the snail smokescreen gone, the female fish seemed to work even harder to keep their offspring alive by driving predatory fish away (Animal Behaviour, doi.org/bw73).

And just because a region receives above - average deposition doesn't mean that it will have high levels of methyl mercury, the form that builds up in long - lived predatory fish such as trout, pike, tuna and swordfish.

Removing too many herbivorous and predatory fish species deprives coral reefs of critical ecosystem functions and the capacity to respond effectively to other disturbances.

However, only completely closed no - take marine reserves successfully returned large predatory fish to the ecosystem.»

«Predatory fish will not eat those fishes because they think they are venomous and going to cause them harm, but this protection provided also allows some of these mimics to get very close to unsuspecting fish to feed on them, by picking on their scales as a micropredator,» says study co-author Nicholas Casewell of the Liverpool School of Tropical Medicine.

Qingmendous, a 409 million - year - old predatory fish provides unique insights into the early evolution of modern lobe - finned fishes.

These species facilitate the transfer of energy to higher trophic levels by consuming very small prey and then being eaten by larger, predatory fish and other marine animals.

shark A type of predatory fish that has survived in one form or other for hundreds of millions of years.

In the sky, the flying fish is often depicted as being chased by the predatory fish represented by Dorado constellation.

The American Heart Association generally recommends that people eat fish at least twice a week, limiting their consumption of large, predatory fish that might have higher mercury levels.

Minimize the consumption of large predatory fish (swordfish, tuna, etc) as they are higher in mercury.

Limiting exposure to methylmercury - laden predatory fish like tilefish from the Gulf of Mexico, shark, swordfish, and king mackerel (27) can go a long way in avoiding methylmercury accumulation.

In general, you want to avoid predatory fish high on the food chain, since metals concentrate in the eater each time a fish gets eaten, and fish from highly polluted areas like China.

However, keeping these large predatory fish to 2 - 3 times per month max is a good idea.

These toxins become concentrated in older fish, large predatory fish, and in fatty species of fish.

(However, with the concerns about methyl mercury in fish experts recommend you limit your exposure to large, predatory fish to no more than 7 oz a week - less if you are pregnant or a child.)