A new study reveals that the aquarium trade could be responsible for adding new fish to the endangered species list. The study looked at the trade from India from 2005 to 2012 and found that the number of fish exported to other countries that gets reported is probably much lower than the actual number. Many of the fish that are taken from the wild are harvested unsustainably and have experienced severe population declines. A possible solution to this problem is to make the trade process electronic so people can compare the species listed on an invoice with a database of threatened and endangered species. If successful, this would make the aquarium industry much more sustainable.
Researchers are uncovering the mechanical properties that control complex movements in fish. They found that species must be resilient to small changes from one generation to the next, but minor changes don’t affect swimming ability; as long as the body stiffness is above a certain value, the fish can swim. These findings could provide insight into the development of bio-inspired underwater vehicles.
New research reveals that the oxygen content of the ocean is subject to “frequent ups and downs” as different sea creatures migrate in and out of the “oxygen minimum zone” daily. The number of organisms that spend time in the oxygen minimum zone (200-650 meters deep) consume an average of 10 to 40 percent of the oxygen available at these depths. Much of the deep ocean can replenish the oxygen consumed during these migrations, but according to the researchers, this balance could easily be upset. These findings should change the way scientists view ocean metabolism and the impact that marine life has on ocean chemistry.
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