Fish Catch in Cambodia vs Temperature. link.

Study: Warmer Temperatures Increase Fish Abundance, But Reduce Fishing Trips

Global warming is predicted to reduce fish abundance. But when scientists studied fish vs temperature, they discovered there were more fish and larger catches during warm weather, but the frequency of fishing trips went down.

Human behavior must be factored into climate change analyses

MAY 1, 2021 4:04 AM AEST

A new Cornell-led study examines how temperature affects fishing behavior and catches among inland fisher households in Cambodia, with important implications for understanding climate change.

The research, which used household surveys, temperature data and statistical models, revealed that when temperatures rise, people fish less often. At the same time, the study’s authors indirectly found that stocks of fish and other aquatic foods also rise with temperatures, leading to slightly larger catches each time peopled fished. Without careful analysis, it would appear that overall fish catches appear unchanged annually, when in fact, more nuanced dynamics are at play. 

The study highlights why it’s necessary when studying changing environmental conditions to include human behavior along with ecosystem responses; both are key variables when considering how climate change affects rural livelihoods, food production and food access.

The researchers found time spent fishing per outing and the gear choices were not affected by temperature, but fewer people fished as temperatures rose.

They also analyzed fish catch. It turns out that, with effort holding constant, fish catch per outing went up as temperatures rose, which meant the ecosystem became a little more productive when it was warmer. The same pattern was true for other aquatic animals, like frogs or snakes, and aquatic plants. However, without factoring in effects of temperature on human behavior, it might have looked like temperature had no effect.

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The abstract of the study;

Fishers’ response to temperature change reveals the importance of integrating human behavior in climate change analysis

Kathryn J. Fiorella1,*, Elizabeth R. Bageant2, Naomi B. Schwartz3, Shakuntala H. Thilsted4 and Christopher B. Barrett2

Science Advances  30 Apr 2021:
Vol. 7, no. 18, eabc7425
DOI: 10.1126/sciadv.abc7425 

Climate change will reshape ecological dynamics. Yet, how temperature increases alter the behavior and resource use of people reliant on natural resources remains underexplored. Consequent behavior shifts have the potential to mitigate or accelerate climate impacts on livelihoods and food security. Particularly within the small-scale inland fisheries that support approximately 10% of the global population, temperature changes likely affect both fish and fishers. To analyze how changing temperatures alter households’ fishing behavior, we examined fishing effort and fish catch in a major inland fishery. We used longitudinal observational data from households in Cambodia, which has the highest per-capita consumption of inland fish in the world. Higher temperatures caused households to reduce their participation in fishing but had limited net effects on fish catch. Incorporating human behavioral responses to changing environmental conditions will be fundamental to determining how climate change affects rural livelihoods, food production, and food access.

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Credit to the scientists that they showed the graph on the right (see the top of the page).

There seems a lot of pressure on scientists these days to report results which match the prejudices of academia, that warm temperatures are bad news, so it would have been easy to report that the fish catch went down, a legitimate if incomplete result, and leave it at that.

Delving deeper, and reporting that fish abundance and ecosystem productivity actually rises with temperature, but the overall catch goes down because people spend more time doing other things, is pretty courageous for this day and age.

Warmth is abundance. The rate at which plants grow in a warm climate has to be seen to be believed – my mower gets a good workout when the Summer wet season rains hit my lawn. If the world ever warms 4C like alarmists keep promising, much of our planet will look like the Garden of Eden.

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May 2, 2021 10:21 pm

Warmist Alarmists must sit up all night at their computers, trying to think up wacky new studies that they can rough up and augment with pseudo-scientific looking graphs in an attempt to alarm the rest of the population about rising temperatures.
Meanwhile actual scientists are observing a slow decline of temperature setting in worldwide.

Alan the Brit
Reply to  nicholas tesdorf
May 2, 2021 11:53 pm

I’m afraid to say this is nothing new at all! Every manipulating controlling person, group, tribe, race, etc., seeks to create fear as a means of exerting control over others for the simple expedient of power & the ensuing money/wealth/riches that follows! History is full of those types of Humans, e.g. “They have yellow hair, they are different, they are not like us, they must be killed/captured/enslaved, etc. etc! Fear rules!!!! I remember from my youth (just) people with red hair, or “gingers” as they were often ignorantly referred to, were singled out for ridicule!!! Personally I love redheads, I’ve dated a few in my time, & my teenage sweetheart was one!!! Some people just love creating fear as it is a gateway to power, if we let it be the case!!!!

Michael S. Kelly
Reply to  Alan the Brit
May 3, 2021 12:43 am

During the Bataan Death March, red-heads (or Gingers) were the ones summarily shot by the very racist Japanese soldiers. Odd, but I find Japanese (and other Asians) quite appealing. And though I am most enamored of blue-eyed brunet Caucasians (my Mom was one), I really am attracted to certain Gingers – and one in particular, many, many years ago.

Alan the Brit
Reply to  Michael S. Kelly
May 3, 2021 2:06 am

I didn’t know that of Bataan, although I had read of the Death March, a common enough occurrence in Nipponese thinking back then! I also love brunettes with blue eyes! ( I think it’s my age, gulp!!!)

The Saint
Reply to  Alan the Brit
May 3, 2021 8:17 pm

If the world ever warms 4C like alarmists keep promising, much of our planet will look like the Garden of Eden.”

That statement has got to put the alarmists in a state of alarm!

Reply to  Alan the Brit
May 3, 2021 1:39 am

“I remember from my youth (just) people with red hair, or “gingers” as they were often ignorantly referred to, were singled out for ridicule!!!”

As a ginger (now gray ash blond ? ) I resemble that remark.

Having dated a lot of creeds, colours & ethnicity’s in my time, (but never a ginger), my preference is for dusky maidens like the one in this clip –
I love her rhythm method.

Last edited 1 year ago by 1saveenergy
Reply to  nicholas tesdorf
May 3, 2021 12:42 am

They aren’t.

Reply to  griff
May 3, 2021 4:28 am

Yes, REAL scientists ARE

FAKE scientists and AGW scammers, that you worship, are sticking to their FRAUD and LIES

….just like you are, girff-twerp.

Reply to  griff
May 3, 2021 9:44 am

how stupid is this…..they are catching more fish so they don’t have to go out and fish as often…..going out costs money…you don’t spend money if you don’t have to

Reply to  Latitude
May 4, 2021 7:47 am


More than that, lattitude. The commercial fishermen go out regardless of the temperature and even winds and waves and…..
Their data would seem more valuable than household data where the folks prolly split fishing for food with recreational fishing ( although I did not see a lotta recreational fishing during my years in SEA).

Gums sends…

Reply to  Latitude
May 4, 2021 4:32 pm

If you are doing it for subsistence, you also don’t get more fish than you can use or preserve. Gathering food also uses time that could be used for other tasks.

Reply to  nicholas tesdorf
May 3, 2021 2:04 am

There are too many wacky papers to list.
“Flesh-eating Disease is on the Rise Due To Global Warming:Experts Warn”- Science Daily,August 16,2007.
“Global Warming Link To Kidney Stones”- The Times of India,May 15,2008.
And so on.

May 3, 2021 12:42 am

Except they also cause fish to migrate to cooler waters – which may not be in your nation’s waters.

For example, there has been a rapid change in Atlantic mackerel distribution since 2007. Stocks have moved northward as sea temperatures rise. 

The change in the movement of mackerel has resulted in disputes between coastal states over how to share fishery resources. With fish moving across geo-political boundaries there is a lack of agreement on how best to manage the stock. 

With no result to disputes, MSC certification for North East Atlantic mackerel was suspended in March 2019. This suspension affects fisheries operating in eight countries. 

Reply to  griff
May 3, 2021 2:03 am

How do they measure the distribution of a migratory species that ranges from the East to the West Atlantic?

Reply to  griff
May 3, 2021 2:38 am

Except Griff there has been a marked increase in Greenland Sharks being seen and caught off the coast of the British isles. A species associated with colder and deeper waters generally. They are now ranging as far south as the Atlantic coast of Spain.

Reply to  griff
May 3, 2021 4:30 am


Fish are expanding to ranges that they used to frequent for most of the last 10,000 years.

Take the Arctic for example…

Not only is the land surface GREENING, but the seas are also springing BACK to life after being TOO COLD and frozen over for much of the last 500 or so years (coldest period of the Holocene)

The drop in sea ice slightly toward the pre-LIA levels has opened up the food supply for the nearly extinct Bowhead Whale, and they are returning to the waters around Svalbard.–whale-food-returns/1401824

The Blue Mussel is also making a return, having been absent for a few thousand years, apart from a brief stint during the MWP.

Many other species of whale are also returning now that the sea ice extent has dropped from the extreme highs of the LIA. Whales cannot swim on ice. !

Great thing is, that because of fossil fuels and plastics, they will no longer be hunted for whale blubber for lamps and for whale bone.

Hopefully the Arctic doesn’t re-freeze too much in the next AMO cycle, and these glorious creatures get a chance to survive and multiply.

Don’t HATE FISH SO MUCH that you would DENY them an expanded range of existence, , girff-twerp.

Reply to  fred250
May 3, 2021 9:41 am

fred’s right…..they are calling it migration….which paints the picture they are all leaving…..that’s a lie…..they are expanding their range…the cold limited their range before….and expanding their range means more habitat and greater numbers

Ben Vorlich
Reply to  griff
May 4, 2021 1:55 am

Griff, fish have always migrated in response to changes in climate and water temperature. In the past we blamed Gods or witchcraft, blaming Gods resulted in the death young women, blaming witchcraft resulted in the death of old women.
Now we blame CO2 which will result in the deaths of a lot of men, women and children of all ages
All lifeforms migrate North/South or to Higher/Lower altitudes as a result of climate changing That’s why we find tree stumps buried under glaciers, and cutoff Arctic species in the UK, ptarmigan on isolated Scottish mountains and Arctic Charr in Ennerdale and Powan in Loch Lomond and Blue Hares with the ptarmigan.

You are in fact a Natural Climate Change Denier

Teddy Lee
May 3, 2021 1:11 am

Gosh,those Cornell boffins are bloody clever.
Imagine,spending all that filthy lucre and time,and to conclude that greater catches,led to having to fish less often.

Reply to  Teddy Lee
May 3, 2021 1:59 am

Thanks, Teddy Lee, for presenting common sense in such a humorous way. I’m still smiling.


Izaak Walton
Reply to  Teddy Lee
May 3, 2021 5:46 pm

that isn’t what was observed. Total Fish catches decreased during hot weather since the reduction in time spent fishing outweighed the increase in fish caught per hour.

May 3, 2021 1:15 am

“my mower gets a good workout when the Summer wet season rains hit my lawn. If the world ever warms 4C like alarmists keep promising, much of our planet will look like the Garden of Eden.”

Eric, you’ll have to buy a bigger mower … or some sheep.

Reply to  saveenergy
May 3, 2021 6:49 am


Reply to  Oldseadog
May 3, 2021 6:37 pm

Their crap makes a mess but they’re fantastic watch dogs. US SAM sites used them for watch dogs in Europe during the Cold War.

Ben Vorlich
Reply to  Rah
May 4, 2021 1:07 am

Only following the lead of the Romans. In about 390 BC Rome was saved by Holy Geese scared to Juno. Under siege on the Capitoline by Brennus and his Celts who’d sacked most the city Brennus and his men tried to take the last part of the city and the sleeping Romans were woken by the honking geese.

Bubba Cow
May 3, 2021 2:12 am

“… in fact, more nuanced dynamics are at play …

At last!!

“Climate Science” now has a new focus – the search for the elusive and certainly patentable Nuancemeter.’

Imagine the excitement in university labs everywhere. Entire new graduate programs will be crafted. Smart apps will flood the web.

May 3, 2021 3:10 am

Bottom line … warmer climate + smaller glaciers = larger oceans. Mother Nature is making the oceans great again — and the fish and corals love it.

May 3, 2021 3:19 am

Effort was not constant.

May 3, 2021 3:25 am

Open ocean surface temperature has a regulated limit of 30C. It does overshoot a little but annual average rarely exceeds 30C in any location. The proportion of ocean area having a monthly average drops dramatically above 29C. The only areas warmer than 32C are isolated bodies of water where the convective cycle is disrupted.

The global average temperature will not stray far from 14C while ice persists at both poles and there is no indication it is going soon.

Ron Long
May 3, 2021 3:32 am

“Warmer temperatures increase fish abundance, but reduce fishing trips”. In a somewhat related story: Warmer temperatures produce more trips to the beach, where hot dog and beer sales are rising.

May 3, 2021 4:07 am

I didn’t read the study, but did the “scientists” consider that in warmer weather there were fewer fishing trips because each trip produced more fish and so the fishermen caught as much fish with less effort? Duh?

Tom in Toronto
May 3, 2021 6:54 am

I love how the error areas for both include drawing the exact opposite conclusion.
The correct summary of the study should be “Temperature has little to no effect on fish or fishing”.

Reply to  Tom in Toronto
May 4, 2021 4:40 pm

Actually, from the study

Yet, the net effect of temperature on fish catch (Fig. 3A) is statistically insignificant

May 3, 2021 8:23 am

household surveys, temperature data and statistical models, revealed that when temperatures rise, people fish less often.
Gee! Maybe people don’t like to get hot?

Steve Z
May 3, 2021 9:23 am

Not sure whether one can generalize findings in Cambodia to the rest of the world, but there may be some simple explanations for this:

When the weather gets hotter on a tropical river or lake in Cambodia, people will tend to fish early in the morning, then escape the heat in the middle of the day.

If the fish are more abundant in warmer water, the small fishing boats on Cambodia rivers probably have a limited payload (including the fish, fishermen, and fishing equipment) they can carry without sinking or running aground. If there is a particularly abundant catch some morning, the fishermen will probably stop fishing when the gunwales are slightly above the waterline, and bring their catch to shore before they lose it.

May 3, 2021 10:07 am

People fish less when it’s really hot out.

It’s really uncomfortable to be out in the open sun on really hot days and if you do it wrong you could end up with severe sun burns, heat stroke, or other heat related illnesses, many of which can be deadly.

But “intellectuals” needed a study to discover this.

The only convincing argument I’ve ever heard that encouraged me to continue formal education:

“Without education, we are in a horrible and deadly danger of taking educated people seriously.” 
–Gilbert Keith Chesterton 

Chris Schoneveld
May 3, 2021 11:52 am

In the title: “Warmer Temperatures”. What is that? How can a temperature be warm? Similarly, expensive prices don’t exist. It should be higher temperatures or higher prices. Warmer climate, yes. Warmer ocean water, yes. Warmer atmosphere, yes. Warmer temperature, no!!!

Temperature, like price is a metric which you cannot assign a physical property. it is typically in the English climate literature/writing where this semantic crime is being committed. I can’t stand it any longer and have to release my frustration in this comment because it was staring in my face in this bold letter title.

H. D. Hoese
May 3, 2021 12:27 pm

That’s probably a great fish paper compared to this–
“Warming and fishing affecting survival of small fish [first to study]..” [“AAAS and EurekAlert! are not responsible for the accuracy…. ”] derived from title – Multigenerational exposure to warming and fishing causes recruitment collapse, but size diversity and periodic cooling can aid recovery. PNAS May 4, 2021 118 (18) e2100300118;

The study was on the freshwater aquarium long cultured and researched zebrafish, growth and generation time very fast, matures at 3″, eat their own eggs. Unbelievable, better double check. 

“ We explored these interactive effects on early-life development and survival by experimentally manipulating the thermal and harvest regimes in 18 zebrafish (Danio rerio) populations over six consecutive generations. ” Paywalled, but references included a paper on the rather distantly related reproductive biology of elasmobranchs. In their summary–“Their [rapid climatic warming and fisheries harvest] collective impact on fish recruitment—a key process underpinning stock abundance—remains poorly understood.” Mainly by them.

No wonder that I never got a paper to review from NAS. Need to put that on my resume.
And I used to think that Australian biologists were ahead, actually are on some subjects.
Lay off of Griff, probably smarter than these guys.

Charles Higley
May 3, 2021 3:39 pm

When fish are more abundant and catches increase, it makes sense to have fewer fishing trips as, otherwise, the price of fish would necessarily drop. It’s just good business.

The same thing is true in lobster fisheries.

May 4, 2021 5:29 am

Ok, I’ve decided I’m going to fail the paper right off the top with the grammatically incorrect title.

Title should be:

Warmer Temperatures Increase Fish Abundance and Reduce Time Fishing”

The use of ” , but ” can only be intentional misleading language and deception. Additionally no actual study for a baseline of water quality, toxicity, temperature of the water were done. The author definitely jumped to someone else’s leap to a conclusion mat.

So there’s no actual validation of an assumed temperature increase.

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