about me



< September 2021 >
    1 2 3 4
5 6 7 8 91011

past articles »

Click for San Francisco, California Forecast

San Francisco, USA


Farms from air

Mainly due to Covid travel restrictions, I still haven’t visited any of our customer’s fish farms. Salmon aquaculture is a large industry in Norway. Many fish farms can be found in Norway’s inlets. With Google maps, I can take an aerial tour.


Three circular fish pens are connected to a barge that supplies fish feed.


Each pen’s diameter is 50m. How large is that? An Olympic swimming pool is 25m x 50m. A fish pen would fit inside two Olympic swimming pools.

2 x 3 pens just off the coast

I was curious about how a fish pen compares to a land based farm by size. To do that, I looked up a center pivot irrigated farms in Kansas. The farms’ circular shape makes them stand out from the air.

I superimposed the image of a Norway fish farm on a circular land farm. The fish pens are just small circles inside the much larger circle. It has a diameter of 800m, the same width as the Golden Gate Park. If the entire Golden Gate Park is converted into circular farms, it can fit five of them.

Land farm / fish farm

Kansas is full of farms like this. Just see this when we zoom out to this 70 x 35km area. This is only one corner of Kansas.

Kansas farms

I know little about the business of farming. But I bet that the yield, by economic value, is higher for the six salmon pens than the much larger grain farm.

What about calories? Could a fish farm yield enough to produce a meaningful share of protein for the world’s population? A 50m fish pen is large at human scale. But it is just a speck of dust relative to the vastness of the ocean. Could aquaculture scale up much more?

Perhaps we can innovate to produce food from much less land. Then we could stop cutting down forests for farms, even reverse the agriculture’s land use impact, allowing farm land to turn back into forests and wildlife habitat. The next green revolution could be world changing.




blog comments powered by Disqus

past articles »


BBC News


Xi defends Hong Kong rule on handover anniversary (01 Jul 2022)


Hong Kong handover: What will the next 25 years hold? (01 Jul 2022)


Ukraine war: Russian missile strikes kill 18 in Odesa region - emergency service (01 Jul 2022)


Missing Cryptoqueen: FBI adds Ruja Ignatova to top ten most wanted (01 Jul 2022)


Nupur Sharma: India court says Prophet row 'set country on fire' (01 Jul 2022)


Bison attacks woman at Yellowstone National Park (01 Jul 2022)


Technoblade: Minecraft YouTuber dies from cancer aged 23 (01 Jul 2022)


Supreme Court limits Biden's power to cut emissions (30 Jun 2022)


Nato Summit: Did Justin Trudeau forget Australian PM’s name? (01 Jul 2022)


North Korea claims Covid arrived on 'alien things' near border (01 Jul 2022)

more »


SF Gate


'This will be somewhat painful': Elon Musk talks Twitter takeover in extended interview at TED2022 Vancouver (14 Apr 2022)


Best Background Check Services in 2022, Top 13 People Finder Sites Reviewed (5 Apr 2022)


Better.com employees got severance checks before they were laid off (9 Mar 2022)


Apple joins other Bay Area tech giants in responding to Russian invasion of Ukraine (1 Mar 2022)


Uber will now show you how you’re rated by drivers (18 Feb 2022)


The man behind Google’s Silicon Valley headquarters says fancy tech offices are ‘dangerous’ (24 Jan 2022)

more »

Site feed Updated: 2022-Jul-01 03:00