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Category Archives: Uncle Davey's Natural Selection

I love nature. This section contains everything that falls within that interest area.

Some Q&A about culinary matters (Quora #2)


A couple of Saturdays ago I started a series which was intended to reproduce my inputs on Quora over here on this blog, as a repurposing and collating of them as well as a way of making sure I don’t lose my own content.

Having given more thought to the way of doing this, I have decided to do these Quora Q&As on Saturdays but to change the approach slightly, namely instead of having one answer per post to only have one answer if it is a nice big essay but often (as in the case of the first one) it is too short to deserve being a whole week’s portion. Not only will these posts look funny but also they won’t be very useful and I’ll never get through the whole corpus of my answers on Quora.

So I decided to group answers around themes and I have a little sheet where I am preparing them for these Group posts, based on the format I’ll be doing today.

Cymothoa exigua – the fish louse mentioned below – in action.

Please remember that my answers vary a lot from facetious to informative usually depending on my mood, the time available and what I think about the question. Be prepared for a rather broad range of approaches to questions.

If you want to discuss or ask anything else around these themes, please get a discussion going in the comments. It’s what the comment facility is there for. I hope it is not onerous to log on and make some kind of utterance.

As mentioned in the title, the theme for today is Culinary, and these answers were given by me all in late 2015 or the first half of 2016.  I’ve got three Q&As for you today in this topic.

1. Why are people okay with consuming raw fish or rare steak when it may contain parasites?

Well, it’s not a good idea eating raw river fish and you won’t actually find that much by way of river fish in sushi bars.
With two exception, the Candiru and other people themselves, all parasites on man are invertebrates. They don’t have kidneys, they cannot osmoregulate. The ability to do this happened in the notional common ancestor between us and lampreys and anything “higher” than that has kidneys, anything “lower” doesn’t.

So those invertebrates that live in the sea want a salinity for their plasma of nearer 27 ppm while those from freshwater want lower than 9 ppm, which is what vertebrate plasma has.

So fish lice and other parasites in marine fishes can’t survive the change form a marine to a non-marine environment. You don’t have to worry about them breeding in you. There is one illness from one louse but extremely rare and limited to a few species. But these days marine fish have other risks, namely contamination from plastics and metals that they have absorbed from the sea.

That’s now a bigger worry than parasites by far if we’re talking about marine fish, and brings us back to the urgent and much larger issue of how we can reduce new marine pollution with plastics and heavy metals as well as clean up what is already floating around out there.

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Are some animals more viable for exploitation than others?


Christopher Lewis asked me on Facebook:

I am interesting on understanding your scale for judging an animal’s suffering. How do we know killing one animal is fine, another is wrong. Torturing one animal ok, hunting another to extinction not.

Here’s my answer:

Christopher Lewis It’s an excellent question.

I would formulate my thoughts this way:

  1. Vulnerability to extinction.
    First, we have to protect species against extinction. I believe it is a massive sin to cause any extinction of species, a total blasphemy against the Creator as we cannot create a single species. And also the loss of the genetic material robs future human generations of the opportunity to experience this life form. So I make the same point here for animals, plants, fungi and without regard to size or complexity. We cannot replace them, and don’t destroy what you cannot create is an excellent maxim for life.
  2. Controllability of habitat and numbers
    Second, given the first point, we need to take more care with regard to animals or plants where the slide to extinction is less controllable by us. So at the moment marine life has a bigger call on protection because we have certainly placed plastics into the oceans at measurable amounts and this is completely and guaranteedly anthropogenic and there is no debate about it, unlike the debates that can be made in the case of greenhouse gases and global warming. I am in two minds about GW but I am not in two minds at all about the plastic issue, to the degree where I jumped up and down and got everyone in a small chain of stores I do things with to abandon plastic bags entirely. I have been talking about the plastic issue for fifteen years in fact, and finally people are starting to take the issue seriously and hopefully not too late, but we still don’t know how good the clean up can be and how fast. So I put animals in the line of threat from plastics into a degree of priority.
  3. Strength of links to others of the species
    It does appear that certain animals, even from their behaviour, have empathy to each other and interact with each other and some have interactions with their offspring which are related to love and tenderness in the human. For animals where the loss of one causes distress to others, I give more consideration than for the ones which do not have such a case. There are many species of bird, for example, that could be domesticated but humans have not chosen for the farmyard those which have lifelong pairbonds and which pine away when their loved one is taken. Take a chicken from the rooster and he happily carries on with his existing harem and the other chickens also don’t tend to look around for the missing hen. Do this to penguins, storks, swans and many other birds and mammals and you have a node of suffering. So I give priority not to eat the animals which show tenderness to one another and which demonstrate meaning to one another. In “The Time Machine”, for example, H.G.Wells Morlocks have taken the trouble to breed out of the Eloi race of humans they are farming any kind of empathy for each other. As indeed the powers that be do to us today, replacing Christ’s call to love our neighbour with the empty husk of political “correctness”.
  4. Intelligence regardless of sociability
    Fourthly, the above point doesn’t mean that vertebrates are always preferred over invertebrates. It appears that shrimp which people eat in great numbers are social and that the octopus, which is pretty anti-social really, is a startling intelligence and deserves a bit more respect than your typical invertebrate. All of this is subordinate to the first and second point, anyway.
  5. Deaths per kilogramme of useable protein
    This leads on to the fifth and this is an important point. If we are turning a living, sentient animal into amino acids for our own digestion, it seems to me to be more moral to take one animal that will feed many families over many meals than to take an animal which it takes many of to feed one person one meal. This is one of the reasons why I try to avoid shrimps. It takes maybe 10 shrimps to make a meal for one person, whereas a cow might make a hundred meals so the relationship of shrimps to cattle to give you a tonne of protein is at least a thousand (maybe closer to ten thousand) shrimps to one cow. This is an extreme example. Now if we placed the intelligence and value of the life of the shrimp at only one thousandth of that of the cow, maybe that would be justifiable. But if you look at shrimps in an aquarium for any length of time you’ll see probably just as much different activity and expression going on as you’ll see on a cow’s face as it stands around chewing cud, and maybe even more. So for me it’s disturbing to think that we could be making a virtual holocaust of these crustaceans just to produce the kilos of a single slaughtered cow. Likewise when it comes to fish is it not a bit disturbing to take a thousand capelin to give us the equivalent flesh of one tuna? Worth a thought.
  6. Naturally predated
    And then we have the sixth issue. Prey animals. Animals are by nature divided into hunter and hunted. The hunted tend to be thise which are naturally in the niche of proviing meat to other species and to a degree they evolved into it. It is part of being a sheep that you get eaten by a tiger, it is part of being a tiger that you don’t get eaten by anything. Human agriculture fit into this natural division in that we usually don’t eat tigers (some do) and usually do eat sheep (some don’t).
  7. Substitutability.
    If an animal or plant can be substituted with another in order to give the necessary thing we are looking for (example tortoiseshell now largely replaced by plastics) then it is best to take the version of the product with the least offences against these other points. If there is no substitute then all the more we need to take care that the species is protected from extinction. Usually this involves careful cultivation over a number of different sites.
  8. Farmability
    Given the last point, an animal or plant which can actually be farmed is a better candidate for use than a wild species that cannot be kept and cultivated under human control. Those which can be kept ought to be kept in a proper way, with regard to diet, housing and enrichment. The use of battery farms and similar is becoming thankfully a thing of the past, and this trend should continue. We are making a one way trade with these animals, they feed us and give us food and fibres, plants render to us all their nutrients and chemicals and of course it is not a deal any of them signed up to. The least we can do is give them a reasonable time of quality life with as low suffering as possible prior to sacrificing that life, again with the minimum possible suffering. Not all species lend themselves to farming, on the other hand those species which do also seem to lend themselves to adaptation into numerous breeds with varying characteristics.
  9. Multiple products.
    It is maybe good in view of the above to use synthetic fur rather than real fur, however if synthetic fur becomes unviable for any reason, it is better to farm fur animals which are also edible, such as rabbits, rather than mink which are only there to provide fur and which by the way require the sacrifice of numerous other animals to nourish them, although they can of course be fed on foods made from spent hens and dairy cows not usually sold for human cuisine. If we are going to sacrifice an animal, we should at least waste as little of it as possible. It is good to keep sheep as they provide milk and wool in addition to the produce of their carcase. Cattle produce leather in addition to their milk and blood products taken during their lives but this, like their meat and unlike wool, is a one off event at their death.
  10. Utilisation of inedible food. Humans cannot eat grass which is the easy crop. Cattle, sheep and camels do eat these as they are cellulose metabolised, thanks to their microbiota hosted in special chambers of their alimentary canal. Pigs can eat acorns and scraps which humans cannot eat. Via these animals, oak forests and grasslands have a use to us which might make the difference between keeping them going with their additional biodiversity, which you wouldn’t find in say a wheatfield. Hence farming them has advantages which vegetarians tend to overlook.

    Now let’s apply all the above to the issue of whales. They for sure let themselves down on the size issue – one whale will feed more than one of almost anything else, and given that we cannot eat plankton they let themselves down in the acorn argument too, but on the other arguments we shouldn’t be taking them.

Little horse in the park


Original YT playout date: 18 May 2008
Duration: 14:17

Some of the playgrounds in Warsaw are called “Ogrod Jordanowski” after this guy Jordanowski who worked out that swings and roundabouts and stuff for kids rather than just have a park with plants in it.
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Uncle Davey’s Cyprus #4/6 – A Walk to Amathus


Original YT playout date: 17 May 2008
Duration: 13:41

This sunken ancient port near to today’s Limassol is barely visible through the waves but the walk there from the hotel reveals several natural curiosities, as this fourth video in my Cyprus series shows.
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Aquarium in Warsaw Airport


Original YT playout date: 10 May 2008
Duration: 7:23

This is a new aquarium in the “Business Shark” bar in the departures area of the new terminal at Warsaw airport.

They have a snail problem – nothing a few clown loaches couldn’t solve, but then they might have to kiss their shrimps goodbye too…

Statistics and Credits
Views at the time added to HTV: 1,416
Likes at the time added to HTV: 4
Dislikes at time added to HTV: 1
Popularity % ” ” ” =L/(L+D): 80.0%
Comments at time added: 0
Total interactions at time added: 5
Total interactions to views 0.4%
Location: Warsaw Chopin Airport – Business shark café.
Other people featured: None
Genre: Aquarium
Music used: 出水清蓮 – 王珣
Languages used: English
Animals/plants featured: Numerous species of aquarium fishes, notably cardinal tetras and rummy nose tetras.

What’s up, ducks?


Original YT playout date: 9 May 2008
Duration: 3:40

They are obviously still very much in love, but sulking. Each is hoping the other will turn around first. They miss each other, although they are only two feet apart, it may as well be another continent.
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Uncle Davey’s Cyprus #2 In and Around the Mediterranean Beach hotel


Original YT playout date: 3 May 2008
Duration: 11:52

“Part Two of my Cyprus series – and I put the new camera through its paces to see whether I could compete with these “”papirazzi”” types…

Would I recommend this hotel? Yes I would. I am likely to come back on my own budget with my family, at some point.”
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More funny moments with Pushkin


Original YT playout date: 30 April 2008
Duration: 10:20

It’s time for more feline fun. He likes to keep an eye on George in the garden as well as chase and retrieve objects.
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Firebugs and Anemones


Original YT playout date: 15 April 2008
Duration: 5:01

I have made better films and photos of the firebug, which is very frequently found in Warsaw, these ones next to the Warsaw office, on the parking space paving blocks we ourselves unpacked all those years earlier.

Find out the reason for the unusual Polish common name of this insect “tramway”…

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Uncle Davey’s Herts Content, #13 “More Geese than Swans”, aka “fowling the water”.


Original playout date: 5 April 2008
Duration: 8:32

We’re having fun feeding the birds by the Gade in the Water Gardens in Hemel Hempstead, Sophie and me.
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