The brackish migrant fish population has declined by 81 since 1970. These include fish similar as salmon, trout, eels and sturgeon that make long peregrinations at different stages of their lives. According to the Living Planet Index 2024 released on migrant fish set up in clean water, they're declining at an average rate of 3.3 percent per time. 284 species of fishes have been tracked in this indicator.
According to the report, migrant fish depend on brackish aqueducts and gutters for their survival. Some of these fish travel thousands of long hauls. From small aqueducts to big gutters, they occasionally cross the entire mainland and return to the same sluice where they were born. The European eel peregrination about 10,000 km over two times to reach its parentage point near the Bahamas.
In such a situation, the decline in the population of these fish isn't only damaging the brackish ecosystem, but it's also hanging the food security and livelihood of millions of people. In South America and the Caribbean, populations of these species have declined by 91 in 50 times. This is the area where the largest brackish migration takes place in the world, but due to adding mortal ambition over time, the way heads are being erected in gutters, mining and systems are being run to divert aqueducts, it's constantly causing damage to the ecosystem.
All of these factors contribute to the decline in population. About one- third of brackish species are hovered with extermination. The threat is lesser for migrant fish. The free inflow of gutters is necessary for their trip, but the declining inflow has come a trouble to their survival. In Europe, for illustration, there are about 1.2 million levee- suchlike obstacles to the free inflow of gutters. adding pollution in gutters, stalking and climate change are also proving fatal for these species.
The huge decline in their population is also responsible for the dirty water coming out of the metropolises and diligence and the water flowing out of the fields, as it contains dangerous fungicides which are getting a trouble to them.