Industry News

How to protect salmon with PIT Tag?

2020-07-02

In recent years, in Colombia, with the overkill of humans and changes in the environment, the number of wild salmon has declined year by year and is on the verge of extinction. Salmon is a reproductive migratory species. Every year they swim to the inland rivers of Colombia to spawn, and then swim back to the sea; they swim back to spawn again the following year. However, there are many difficulties and obstacles on the way. A large number of salmon are exhausted after laying eggs, and it is difficult to have enough physical strength and energy to swim back to the sea.
 
In order to protect the salmon, the Colombian animal protection organization came up with a way to capture a large number of salmon in the spawning area, through artificial feeding and conditioning, so that they can safely pass through the difficult spawning period, and help them restore physical fitness and Be healthy, and then send them back to the river, looking forward to improving their survival rate. But is there any effect in this way?
Researchers from animal protection organizations cannot make intuitive judgments. They can only make guesses by observing whether there are more fish spawning this year than last year, but this guess is very unreliable because the number of salmon fluctuates every year. Affected by many factors; in other words, even if this year's fish did return more than last year's fish, it may not be the contribution of fish farmers' environmentalists, perhaps because of the impact of annual temperature changes, environmental Changes and other factors.

So environmentalists came up with a plan to capture all the salmon in the breeding area, inject a PIT RFID tag into the salmon body, and enter the tag of the fish’s identity in the tag. Able to read the identity number of the fish, and then know the length, weight, health and other information measured by the fish in a certain year, month and day. Environmentalists have injected PIT RFID tags to 10,000 fish and released them to nature.
In the second year, when re-captured, 150 fish were found, which were the 10,000 marked fish from last year, so the survival rate of salmon in the wild state during a reproductive migration cycle was only 1.5. %. In the same way, scientists provided artificial feeding and health conditioning to another 10,000 salmon injected with PIT RFID tags. By the second year, when they were caught again, there were 1100 fish found from artificial feeding and health conditioning. The survival rate of the passing fish has increased to 11%, so we can intuitively understand that the animal protector's care for the fish is significant, and indeed the survival rate of the fish has been greatly improved.
Animal protection organizations have gained recognition from the people by publishing the results supported by reliable data to the media and the government, which in turn has gained more human and financial support.
With funding and social support, animal protectors can do more. They developed a new type of feed and divided 20,000 fish that were artificially cared into two groups. Ten thousand fish were still fed with the original feed and another 10,000 fish were fed with new feed; the production was captured again the following year. For the salmon in the egg area, it was found that the survival rate of fish fed with raw materials was still 11%, but the survival rate of fish fed with new feed increased to 15%. Environmentalists are confident that by marking fish and then trying to improve their living environment, food, and vaccination, they can increase the survival rate of fish migration to 20% in one cycle. Over time, Colombia's wild salmon will be able to return to a very healthy and safe quantity.
The application of PIT RFID has contributed greatly to the protection and research of wild salmon in Colombia.