The world’s largest wild and protected walleyes live in the waters off the coasts of Japan, South Korea and South Korea, as well as in the North Sea.
In addition, walleyean stocks have been harvested commercially off the coast of Florida and the Atlantic Ocean.
Researchers at the University of Florida’s Department of Fisheries and Aquatic Sciences and the Florida Fish and Wildlife Conservation Commission (FWC) have discovered the catch rate of walleyen is lower than expected, leading to concerns about their health and sustainability.
“We’re concerned that walleyed species could be subject to a wide range of human impacts, including pollution, pollution from fishing, and pollution from other marine species,” said John Stahl, a biologist at the university.
“Walleye populations are on the decline due to human overfishing, climate change, and habitat loss.
They are the species most vulnerable to these problems.
Their abundance and size means they are more vulnerable to pollution and pollution-related diseases than many other fish.”
This is the first time scientists have observed walley eels at a global scale, and the research team, led by FWC fisheries ecologist David DeWitt, used a novel technique to measure the density of walleys at different depths.
The technique, called a hydrostatic pressure wave, allows scientists to determine how far a walley’s head protrudes when it is caught.
In this case, the researchers found walley heads are at their most pronounced at the bottom of the ocean.
“At the bottom, the fish are less dense, which makes it easier to measure their head depth,” said Stahl.
“As we got closer to the bottom and the water depth, we found that walleys head depth increased in a much more consistent fashion, indicating that their head densities were decreasing as we got farther from the surface.”
To determine the number of walkees caught per day, the team used the maximum rate of harvest recorded during a previous study in the Beaufort Sea, a region known for its high abundance of walkes.
That study found a maximum of 10,000 walleyese were harvested per day in the area.
“This study demonstrates the potential of this new method to provide a comprehensive picture of walkinear’s distribution and health status,” said FWC biologist Gary L. Meeks.
“There are several key factors that influence the distribution of wallees, including their size and weight.
By understanding how the water level changes in this region, we can predict how much walley is going to be available for harvest and determine how many will be caught.”
Stahl noted that it is also important to consider the environmental impacts of fishing, particularly the impact on marine ecosystems.
The team also identified factors that could affect the health and productivity of walie eels in the future. “
It is critical that we understand the impacts of the fishery on the environment, especially the effects of pollution, which is impacting fish stocks and our understanding of the health of the species.”
The team also identified factors that could affect the health and productivity of walie eels in the future.
“Our research demonstrates that the health, productivity and abundance of the walley species are affected by a variety of factors, including habitat degradation and pollution,” said Meeks, who is a member of the FWC’s Atlantic Coastal Research Center and an expert in marine biology and fisheries.
“For example, pollution impacts on walleyear are not the only factors that affect their productivity, and these impacts are compounded by the fact that walleese populations have been on the rise in the past decade.”
For more information about the research project, visit: http://bit.ly/2q5cVj6