Poisonous sharks found in London’s River Thames

A survey by the Zoological Society of London (ZSL) revealed “positive news” for wildlife and ecosystem recovery, the society said Wednesday.

Dachshunds, like the one in this file photo, have venom-secreting spines on their dorsal fins.

Pally / Alamy Stock Photo

In 1957, the river of the capital city was declared “biologically dead”.

But now, surprising creatures such as sharks have been found, including the cap, the smooth star hound, and the spurdog, a slender fish that is about 23 inches tall and covered in poisonous spines.

Dachshunds can be found in deep water, and the spines in front of the shark’s two dorsal fins secrete a venom that can cause pain and swelling in humans.

Cap sharks, like the one shown here in a stock photo, can reach six feet in length.

Cap sharks, like the one shown here in a stock photo, can reach six feet in length.

blickwinkel / Alamy Stock Photo

The cap shark, which feeds on fish and crustaceans and can grow to 6 feet and up to 106 pounds, has never launched an unprovoked attack on humans, according to the UK Wildlife Trusts.

Meanwhile, the star hound, which can reach up to 4 feet 25 pounds, feeds primarily on crustaceans, shellfish, and mollusks.

However, the number of fish species found in the river’s tidal areas has shown a slight decline, and conservation scientists cautioned that more research is needed to understand why.

Stock image of a star hound.  These sharks eat mainly shellfish and crustaceans.

Stock image of a star hound. These sharks eat mainly shellfish and crustaceans.

Pally / Alamy Stock Photo

The 215-mile river, home to more than 115 species of fish and 92 species of birds, faces threats from pollution and climate change, ZSL warned.

The river also provides clean water, food, livelihoods, and protection from coastal flooding to surrounding communities.

Climate change has raised the temperature of the Thames by 0.2 ° C a year on average, ZSL said, warning that this “paints a worrying picture” when combined with rising sea levels.

Water levels have been rising since monitoring began in 1911 in the tidal section of the Thames, rising at some points by an average of 0.17 inches per year since 1990.

“As water temperatures and sea levels continue to rise above historical baselines, the estuary’s wildlife will be particularly affected, through changes in the life cycles and ranges of species. “ZSL warned in a statement.

Reference-www.cnn.com

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