Posted by World Wide News Service on Friday, January 25, 2018 08:06:10TUSCALOOSA, Ala.
(AP) It’s been more than a century since the first known greenland humpback whale was captured off the coast of southern California.
Now, scientists are warning that the same thing could happen to another species of whale, which is now listed as endangered in the U.S. and around the world.
Scientists from the California Academy of Sciences, California State University, and other conservation groups have published reports on how the bluefin tuna, the only species of dolphin in the United States with a recognized status, is threatened.
Greenland humpbacks are known for their powerful jaw-dropping leaps, but their unique physiology and vocalizations, which often attract fish, are the basis of their name.
The new findings show that the blue-fin tuna is the only one of its kind, with an estimated 1,600 known in the wild.
The first spotted on the coast, in the 1950s, only lasted about 10 years before being destroyed by commercial fishing.
Its survival rate since then has plummeted.
In a recent report, the National Marine Fisheries Service noted that the redfin tuna was found to be declining rapidly, with only about 1,000 individuals left in the world, down from about 10,000 in the 1970s.
Redfin tuna have been found to have less energy, have more energy loss in the tail, and less muscle power than bluefin.
The species’ survival rate has declined to about 1 per cent, the report said.
Greenlips, also known as red-billed or blue-belly, are also an endangered species in the Northern Hemisphere.
They can weigh as much as 50 pounds and live to be about 10 feet long.
Their only known predator is the Atlantic salmon, whose eggs can be ingested by bluefin whales.
Redlips have become endangered in recent years.
Scientists in the northern United States have observed them swimming in the waters off the California coast and spotted them in 2013.
That year, scientists in Florida caught redlips off the east coast.
They then released them into commercial fishing nets.
But redlippers are endangered in other parts of the world where their populations have been declining in recent decades.
Scientists have tracked the populations of redlits in Chile, Japan, Canada, Peru, and Russia, and in Chile there are reports of the species’ numbers dwindling.
“It’s like if we had another disease,” said Dr. Michael D. Hausfeld, a professor of biology and conservation at the University of California, Santa Cruz, who is a co-author of the new report.
“They’re not reproducing anymore.
The populations have declined to the point that there’s nothing left to breed,” he told The Associated Press.
Hausfeld said he thinks the decline of redfin populations is due to habitat loss, as well as a change in fishing techniques, including using steel-toed trawlers.
Hauling steel trawls from Japan to Chile in the 1960s and 1970s, along with using steel nets to catch the fish, contributed to the decline in redlitts, he said.