China's rivers and lakes inhabit a large number of fish, common ones are silver carp, grass carp, bluefish, crucian carp and carp, and some are not long seen yangtze river sturgeon, finless porpoise, rouge and other protected species.
But the name of the helio, I believe many people have heard of it for the first time, even the residents living on the banks of the river, may not have seen it, or even heard of it, because the heel has left our sight for too long.
Rouge
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Helio fish, also known as Diao Zi Fish, Wheat Straw Diao, Chang Diao and Diao Guan, are carps belonging to the family Carp. The appearance of the helio is somewhat similar to the carp, but the obvious feature is the mouth of the fish, the mouth of the carp is large and the mouth of the helio is small. The overall body of the helio is slender, the head is small and the whole is awl-shaped; the back of the fish is blue-green, the belly part is silver-white, the even fin and fin are orange, and the tail fin is gray-black.
Helios
Helios are omnivorous fish, but are actually carnivorous. In the juvenile stage, in the natural waters, it mainly feeds on water earthworms, water centipedes, dragon lice, red lady flowers, water axes, pine algae insects, as well as aquatic insects and branches; adult helios mainly feed on small fish and shrimp.
It inhabits rivers and lakes all year round, and has the habit of migrating and breeding in rivers, never entering seawater or light or seawater areas. Helios are medium to large fish, but the growth rate is slower, from the seedling stage to adult, it takes 3 to 5 years, the largest can grow to about 20 to 30 pounds.
Between April and June of each year, the helils enter the breeding period, and it is also the southern region that enters the flood season, so at this time, the hemorrocks will enter the river rapids to spawn and breed, while the slow-flow area cannot spawn. After breeding, the helios returned to the lake again from July onwards, but they almost went to the road of no return!
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Although we are not common in hemorrhoids, according to the older generation of fishermen, as early as twenty or thirty years ago in the lake, this fish is still relatively common, especially after breeding hemorrhoids, will swim into the major lakes. However, due to overfishing in the following decades, as well as water conservancy development and water pollution, the population of heli fish has declined extremely.
Source Guangming Daily
Poyang Lake, known as China's largest freshwater lake, was originally the most preferred place for hemorrings, but only a heel was found in the lake in 2012, and no trace of hemorring has been found since. As a result, in the Red List of Vertebrates of China, revised in 2016, the conservation level of helios has now been raised to critically endangered.
Recently, according to the Jiangxi Provincial Institute of Fishery Sciences, when monitoring aquatic biological resources in the waters of Songmen Mountain in Duchang, Poyang Lake, a helio with a length of about 23 cm and a weight of 47.4 grams was accidentally found. Subsequently, according to the Office of the Department of Agriculture and Rural Affairs of Jiangxi Province, Poyang Lake has been ten years since the last time it was found that helium were found!
Source China News Network
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According to November 2020, during the monitoring of the Yangtze River, Yangtze River fishery researchers surveyed wild Chinese sturgeon in the Yichang section of the Yangtze River, and inadvertently found a helio during the natural reproductive capacity of the Yangtze River. Fisheries researchers also found a heel in the Yangtze River section of Honghu Lake in Hubei Province in June 2017.
With the implementation of the ten-year ban on fishing in the Yangtze River Basin, coupled with the remediation of pollution sources and sewage in recent years, the water quality of rivers and lakes has been effectively improved. In particular, the severe crackdown on illegal activities such as electrofishing, netting, poisoning, and frying, which poses a serious threat to the reproduction of aquatic animals, is likely to gradually recover the number of helimi.
Cormorants fish in Poyang Lake
So some fisheries researchers believe that Poyang Lake will be the birthplace of the recovery of heli fish stocks, but this process will take a long time. However, the recovery of the heli fish population will bring disaster to other fish, because the heli fish, like the carp, are fierce carnivorous fish and are expected to become the "hegemon" of the river again.
In the vast Yangtze River system, there are about 435 species of fish, but about 130 species of fish have not yet been collected. Therefore, the protection of fishery resources should be supervised by everyone, starting from you and me.
What measures need to be taken with regard to the recovery of heliolia populations? What better advice would you give? Welcome to leave a message below, comment + forward, thank you!
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