Chinese paddlefish, one of the world's largest fish, declared extinct
111–120 of 212 posts
Re: Chinese paddlefish, one of the world's largest fish, declared extinct
#112Earlier quoted context omitted.
Even hundreds or thousand of samples of a species would most likely still be an enormous genetic bottleneck. [0] https://en.wikipedia.org/wiki/Population_bottleneck
There are numerous vertebrate species with only a few thousand (or fewer) extant members. Many have been greatly reduced over the 20th century, some have been on a long decline before that. Some have been small / relict / outlier populations for much or all of human history. Whether this means the bottleneck hypothesis is overstated, or that we're looking at a tremendous number of bottlenecks, isn't clear.
The reproductive strategy of a species also matters. Species that produce hundreds or thousands of young (and then winnow down to the survivors) are better at quickly "breeding out" genetic flaws (if 50% of the young die, it's not a big deal), and have an easier time recovering from population bottlenecks.
Vs large mammals where raising one genetically-hobbled offspring (who then dies, or fails to reproduce) is a huge loss to the potential of the species.
Re: Chinese paddlefish, one of the world's largest fish, declared extinct
#113Why can’t they split the river in multiple parts with a small tributary for wildlife that meets up with the rest of the river downstream? https://en.m.wikipedia.org/wiki/River_bifurcation
When the dam was built, they didn’t know they were cutting off the fish from it’s only spawn point in the world (it was discovered later). Still, there’s an argument to be made for building a bypass or fish ladder in every single new and existing dam regardless of what the current expected impact is.
I have issues with comprehending how that wasn't factored in from the start.
Then I remind myself most of humanity history is characterized by a marked tendency toward anthropocentrism, and I cease being surprised.
What surprises me now even more was that there were designs for fish ladders even as far back as the 19th century.
Re: Chinese paddlefish, one of the world's largest fish, declared extinct
#114On some bright news. Thanks to declining American manufacturing (thanks China) The Detroit River has bounced back. Giant 'river monster' fish found in Detroit River may be over 100 years old https://www.cnn.com/2021/05/07/us/sturgeon-fish-intl-scli/in...
> Thanks to declining American manufacturing (thanks China)
Spoken like someone who doesn't work in manufacturing...
Re: Chinese paddlefish, one of the world's largest fish, declared extinct
#115Why can’t they split the river in multiple parts with a small tributary for wildlife that meets up with the rest of the river downstream? https://en.m.wikipedia.org/wiki/River_bifurcation
Do you maybe mean something like a fish ladder? https://en.wikipedia.org/wiki/Fish_ladder
Can all fish jump? Feels like it may be something that salmon are pretty good at, but a gigantic fish may not.
Re: Chinese paddlefish, one of the world's largest fish, declared extinct
#116Earlier quoted context omitted.
Nothing; that's what the title should be. The guidelines ask you to use the original title, and not try to summarize the article yourself in the submission title.
Has anyone ever considered that maybe the HN guidelines are wrong here?
In great detail, over the better part of a decade, yes. You can find some of the rationale here and a few more searches will dig up more discussions about it than even an olympic-level messageboard-hardened person could possibly bear
https://hn.algolia.com/?dateRange=all&page=0&prefix=false&qu...
Re: Chinese paddlefish, one of the world's largest fish, declared extinct
#117Earlier quoted context omitted.
Do you maybe mean something like a fish ladder? https://en.wikipedia.org/wiki/Fish_ladder
Can all fish jump? Feels like it may be something that salmon are pretty good at, but a gigantic fish may not.
Jumping is not always necessary. You can get an idea of possible designs for fish ladders from the photographs in the section "Types" in the article.
Re: Chinese paddlefish, one of the world's largest fish, declared extinct
#118Earlier quoted context omitted.
That sounds highly suspect: "The Chinese government has roving vans that execute dissidents and harvest their organs right outside their house."
https://en.wikipedia.org/wiki/Execution_van PRC does not deny they exist, nor denies that organs are harvested after. There are pictures of them online, and notable cases where it was the officially recorded method of execution.
Well that was a wikipedia link that felt ill to read. Assuming accuracy my apologies for the doubt.
Re: Chinese paddlefish, one of the world's largest fish, declared extinct
#119Why can’t they split the river in multiple parts with a small tributary for wildlife that meets up with the rest of the river downstream? https://en.m.wikipedia.org/wiki/River_bifurcation
Do you maybe mean something like a fish ladder? https://en.wikipedia.org/wiki/Fish_ladder
Or the cool "Salmon cannon" https://www.youtube.com/watch?v=2z3ZyGlqUkA
Re: Chinese paddlefish, one of the world's largest fish, declared extinct
#120On some bright news. Thanks to declining American manufacturing (thanks China) The Detroit River has bounced back. Giant 'river monster' fish found in Detroit River may be over 100 years old https://www.cnn.com/2021/05/07/us/sturgeon-fish-intl-scli/in...
From an economic perspective the biggest losers of the dollar standard is manufacturing and the biggest winners is wall street. Wall Street had secular growth and manufacturing had secular decline from the adoption of the petrodollar and the dollar becoming the reserve currency of the world. Similar changes happened in Europe when the pound became a reserve currency (growth of Germany etc in manufacturing) and then the issues that surrounded relative decline in the City as a financial center till the Big Bang in the 1980s.
Reserve currencies create huge beneficiaries and losers (especially in “tradables” like manufacturing).
Different arguments on this subject:
https://www.wsj.com/articles/to-bring-back-u-s-manufacturing...
https://www.wsj.com/articles/the-dollar-and-the-future-of-u-...