Sentences with phrase «sea lampreys»

Sea lampreys.

When sea lampreys (Petromyzon marinus) mature, growing their jawless toothy gapes and sucking blood of other fishes, iron concentrations in blood drop — to about 10 times healthy human levels.

Sea lampreys are a particular problem in the Great Lakes regions of the United States and Canada.

Scientists had seen that dead sea lampreys in a tank caused live ones to freak out and try to escape.

Unlike most animals, sea lampreys, an invasive, parasitic species of fish damaging the Great Lakes, could become male or female depending on how quickly they grow, according to a U.S. Geological Survey study.

During the study, environments lacking plentiful food were male - skewed, with 78 percent of sea lampreys becoming male after three years, whereas environments more conducive to growth produced only 56 percent males.

«Remarkably, we didn't set out to study sex determination in sea lampreys — we were planning to study environmental effects on growth rates only,» said Nick Johnson, a USGS scientist and the lead author of the study.

«The results of this study could be a critical step toward developing advanced technologies to control sea lampreys in the Great Lakes, which have caused unparalleled damage to fisheries,» said David Ullrich, chair of the GLFC.

Male sea lampreys are hot to trot — literally.

The jawless, blood - sucking sea lamprey found its way into the Great Lakes in the early 20th century through man - made canals, and has been disturbing the peace ever since.

This discovery could be a critical step in developing advanced technologies to control sea lamprey.

Scientists with the USGS and Michigan State University, funded by the Great Lakes Fishery Commission, found that slower sea lamprey growth rates during the larval phase of development may increase the odds of sea lampreys becoming male.

Some sea lamprey populations have skewed sex ratios, but the reasons why have remained a biological mystery for decades.

USGS sea lamprey expert Nick Johnson demonstrates the ridge of tissue, called a rope, along the back of a mature male sea lamprey.

Thanks to the suite of control measures already developed, sea lamprey populations are 90 % lower than their peak populations were 60 years ago.

And indeed the 50 - centimeter - long, eellike creatures can wreak havoc on freshwater communities when they invade from the sea, with a single sea lamprey able to kill 18 kilograms of fish in its lifetime.

For decades, the fishery commission and a team of scientists and advocates across the public and private sectors have been developing measures to control sea lamprey populations.

They also used simulated shark bites on hagfish and their closest relatives, the sea lamprey.

Studies of the modern species» blood - feeding physiology got a solid source of new data in 2013 when an international team decoded the genetic instruction book of the sea lamprey, a notorious invader of the Great Lakes.

We first examined the morphology and development of the dorsal ridge in sea lamprey at various developmental stages (Fig. 2; supplementary material Fig.

Warmer winter conditions, for instance, have the potential to benefit alewife, round gobies, ruffe, sea lamprey, rainbow smelt, and other non-native species.

Images: Sea Lamprey sucking blood plasma from Lake Michigan Lake Trout.

NOAA Glossary Footnote: This author has had a Sea Lamprey attach briefly to his forearm.

His specialty is explaining scientific studies for lay audiences, including recent stories about riverless urban areas in the Great Lakes Basin, the impact of climate change on rare plants and the use of sex pheromones to combat the invasive sea lamprey.

Not exact matches

He samples Pacific lampreys, forages for edible barnacles and harvests sea salt on this culinary adventure.

They compared 146 genes in many chordates, including hagfish and lamprey (considered the most primitive vertebrates) and larvaceans, which are sea - faring relatives of sea squirts.

Namely, we are working on sea urchins (Paracentrotus lividus), amphioxus (Branchiostoma lanceolatum) and lampreys (Petromyzon marinus), respectively, a xenambulacrarian, an invertebrate chordate and an agnathan vertebrate.

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