Monday, October 16, 2017
“Fish Depression No Joke… Dolphins Gossip, Whales Talk In Dialects”
“Fish Depression No Joke…
Dolphins Gossip, Whales Talk In Dialects”
"Can a fish be depressed? This question has been floating around my head ever since I spent a night in a hotel across from an excruciatingly sad-looking Siamese fighting fish. His name was Bruce Lee, according to a sign beneath his little bowl. There we were trying to enjoy a complimentary bloody mary on the last day of our honeymoon and there was Bruce Lee, totally still, his lower fin grazing the clear faux rocks on the bottom of his home. When he did finally move, just slightly, I got the sense that he would prefer to be dead. The pleasant woman at the front desk assured me that he was well taken care of. Was I simply anthropomorphizing Bruce Lee, incorrectly assuming his lethargy was a sign of mental distress?
When I sought answers from scientists, I assumed that they would find the question preposterous. But they did not. Not at all. It turns out that not only can our gilled friends become depressed, but some scientists consider fish to be a promising animal model for developing anti-depressants. New research, I would learn, has been radically shifting the way that scientists think about fish cognition, building a case that pet and owner are not nearly as different as many assume. “The neurochemistry is so similar that it’s scary,” said Julian Pittman, a professor at the Department of Biological and Environmental Sciences at Troy University in Alabama, where he is working to develop new medications to treat depression, with the help of tiny zebrafish. We tend to think of them as simple organisms, “but there is a lot we don’t give fish credit for.”
Dr. Pittman likes working with fish, in part, because they are so obvious about their depression. He can reliably test the effectiveness of antidepressants with something called the “novel tank test.” A zebrafish gets dropped in a new tank. If after five minutes it is hanging out in the lower half, it’s depressed. If it’s swimming up top - its usual inclination when exploring a new environment - then it’s not.
Whales and dolphins lead ‘human-like lives’ thanks to big brains, says study: The cultural brain hypothesis of human development could also explain cetaceans forming friendships – and even gossiping.
Life is not so different beneath the ocean waves. Bottlenose dolphins use simple tools, orcas call each other by name, and sperm whales talk in local dialects. Many cetaceans live in tight-knit groups and spend a good deal of time at play. That much scientists know. But in a new study, researchers compiled a list of the rich behaviors spotted in 90 different species of dolphins, whales and porpoises, and found that the bigger the species’ brain, the more complex – indeed, the more “human-like” – their lives are likely to be. This suggests that the “cultural brain hypothesis” – the theory that suggests our intelligence developed as a way of coping with large and complex social groups – may apply to whales and dolphins, as well as humans.
Writing in the journal, "Nature Ecology and Evolution," the researchers claim that complex social and cultural characteristics, such as hunting together, developing regional dialects and learning from observation, are linked to the expansion of the animals’ brains – a process known as encephalisation. The researchers gathered records of dolphins playing with humpback whales, helping fishermen with their catches, and even producing signature whistles for dolphins that are absent – suggesting the animals may even gossip."
The following selection of sea mammals songs and noises samples different sonic
examples sounds and shows that each species has different vocalizations. Amazing!