Migratory river fish populations down by 76% in the last 50 years: Report

Conservation groups have stated that population of migratory river fish has decreased by 76 per cent on aver over last 50 years. According to reports by several conservation groups, this decline in migratory river fish could in future prove to be ‘catastrophic’ for people as well as ecosystems around world.

'Catastrophic' decline

As per reports by conservation groups that include likes of International Union for Conservation of Nature, WWF, World Fish Migration Foundation and Zoological Society of London, main reason for decline of migratory river fish over years has been overfishing by humans as well as a loss of habitat.

According to report, at least one-third of all freshwater river species face threat of extinction, with migratory river species ‘disproportionately threatened’. study took into account 247 species of migratory river fish over period of 1970-2016. study found that on aver each species saw a reduction in population of about 3 per cent every year. study concluded that Europe saw sharpest decline in fish population at 93 per cent, followed closely by Latin America and Caribbean which both saw a decrease in fish population by 84 per cent.

Researchers in ir report stated that dams and or obstacles pose a great challenge to migratory fish species as y need access to rivers in order to complete ir life cycle. study found that rth America saw lowest reduction in fish population, a decline of 28 per cent showing effectiveness of fishery manment.

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As per reports, large fish like beluga, a sturgeon, or giant Mekong catfish are especially vulnerable to dams and or river obstacles. y are main reason for drastic fish population in Europe, but European Union has stated hat it aims to restore 25,000 kilometres of free-flowing rivers by year 2030.

Light absorbing deep-sea fish

Scientists have recently discovered as many as 16 new species of deep-sea fish that have a special feature that allows n to absorb 99.5 per cent of all light that strikes ir skin.   Similar to ultra-black Vantablack material, se fish absorb light very efficiently, so much so that even under bright light y appear a mere silhouette with features being discernable by human eye. According to reports, new research shows that special near-total light absorption feature of fish comes from an abundance of melanin in ir skin.

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