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An example of a keystone species is the sea otter. Sea otters help maintain the health of kelp forests by controlling sea urchin populations, which in turn allows the kelp to flourish. Without sea otters, sea urchins can overgraze kelp forests, leading to a cascade of negative effects on the entire ecosystem.
Orange sea pens are not currently classified as endangered. However, they are vulnerable to threats such as habitat destruction, pollution, and climate change. Conservation efforts are important to ensure their long-term survival.
The sea star's predators are birds, otters, and humans. This is according to http://library.thinkquest.org/J001418/star.html. Sea Stars (like Solaster dawsoni) also prey on other species of sea stars (like Pycnopodia helianthoides).
Blobfish are endangered because they are often killed by deep sea fishers or bottom trawlers.
I imagine they're too rare and deep-sea to be endangered by humans, but if by "endangered" you mean "not many are likely to exist" then yeah, probably.
sea otters
Sea otters get to be 4 to 5ft long
With use of genetic and fossil evidence, sea otters have been around for at least 5 million years.
Over time, the population of the sea otters has decreased and sea otters are now an endangered species. This can be blamed on human activity, as most animal species' endangerments can.
people hunt them and spill oil on them .
humans want their nice fur
California sea otters are roughly 4 feet long. Northern sea otters are slightly larger. They weigh up to approximately 45 lbs (females) - 65 lbs (males). Northern sea otters can reach up to 100 pounds.
well if you kill all the otters, then all the other animal they eat will have to big of a population and that is not a good thing.
There are many more than these, but here are a few: Blue Whales Sea Turtles Sea Otters Dugong I do not know of any endangered fish species.
Purple elephants
Well, endangered animals that typically live by rivers or lakes will probably. Hope That Helped!
yes, sea otters have young sea otters called pups