The copper river is a huge salmon-eating fish, with some estimates putting its population in the hundreds of thousands.
It’s one of the most widespread fish in the world and can live up to 20 years.
In some areas, such as Canada, it can reach 40kg.
But the fish are sometimes considered too dangerous to eat, and its population has dropped in recent years.
The fish are considered to be a valuable commodity for the Chinese government.
In a paper published in Science last month, a team of researchers from the University of Oxford and Imperial College London described how to find them.
“A copper river-caught salmon is often caught for its high value in China and the Chinese-owned company that owns it,” says the paper.
“The fish can be sold to people who want to raise them for food, but the catch is illegal, so it is considered illegal in many countries.”
The team wanted to understand how these illegal fish were being caught, so they created a technique that lets them examine the fish’s muscles.
They were able to use a technique known as electroencephalography (EEG) to measure the muscle activity of the fish.
The team also compared this data with the fish, which had been in the water for just under 30 minutes.
The researchers found that the fish had an unusually high level of electrical activity, which indicates it’s not simply a fish that has been swimming for a while.
The muscle activity they were able “is consistent with fish that have been caught for decades or decades,” says Dr Paul Jagger, who led the study.
“So there’s a definite link to the age and time of the catch.”
It’s not just the fish that is being caught that has this effect, either.
Other fish that are known to be caught for a long time also have this pattern of high activity.
These include some species of swordfish, the largest fish in this group of fish.
It has been estimated that the swordfish population in China is estimated to be around 1.3 million.
But that estimate doesn’t take into account the people that catch them.
It can take years for these people to catch a fish for the first time, and many times longer for them to catch more fish.
Dr Jagger and his colleagues found that in a study published last year in the Journal of Fish Biology, they found that a group of people could catch an average of around 2,200 fish per day, but that the average catch for these 2,400 fish per month was between 8,000 and 20,000 fish.
In addition, the researchers found the average time to catch fish was also lower than that for the average person, suggesting that people could be catching fish for far longer.
It seems the fish were able do this because they were so small, but this could be due to a number of factors.
These range from the small size of the fishes to the fish being caught in the wrong place.
For example, fish caught in different parts of the river might have different muscle activity levels.
“These fish were caught in shallow water, but they could be caught in higher-quality, more productive areas of the rivers where they were more abundant,” says Jagger.
“They could also have been trapped by a fisherman who was trying to catch the right fish for his catch.”
The fish can also be caught more quickly in different ways.
For instance, they can be caught by fishing from the surface, which can be difficult for fish that aren’t capable of swimming.
This is the method that some Chinese fishermen use, as shown in this video: “When we found that these fish had high activity levels, the fish weren’t being caught at the right time,” says Mark O’Connell, a research associate at the Australian Museum.
“That’s because the fish may have been in shallow waters and it was very easy to get them.”
This is likely to have happened in areas where fish were not plentiful, but it could also be a result of the people being more experienced, as the fish might have been more vulnerable to predators.
“It’s also worth pointing out that it’s been estimated to take up to five years for a person to catch an adult copper river angler, and that’s when they’re starting to realise that the trade in fish is booming,” says O’Donnell.
“We’re seeing a lot of changes in the fishing industry, so people are trying to keep up.”
If you’re a fishing enthusiast, you’ll probably enjoy the fish-finding technique.
“You’ll find the fish pretty easily, and the way you can see how they’re working, they’re very colourful and the colour patterns on their fins will give you a good idea of how much fish are going into the fish bowl,” says David Lister, a fisheries ecologist at the University.
“And you can actually see how much the fish is eating before they get too hungry.”
“It was an interesting study,” says Lister.
“I’m not really sure how you’d do it