Testing if Sharks Can Smell a Drop of Blood

  • Published: 28 July 2019
  • Scientific proof Pixar sits on a throne of lies. Thanks to Bose for their support and for the dopest headphones I've ever worn: bose.life/markrober

    Also, thanks to Discovery for putting my life in danger.
    #SharkWeek begins July 28 only on Discovery
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    Links for the build instructions: dropbox.com/s/iqn14ydzqafhws5/SharkBait_Manual_PartsList.pdf?dl=0

    Sean's Hodgin's channel who did most of the heavy lifting for making the boxes: http://superiorjanitorial.pro/channel/UCE-bw6PRKuDlH6fP1mP4nOw

    Pump animation made by the talented Jared Owens:

    Connor was the beast feeding the sharks underwater. He has some amazing footage for licensing and his own RUclip channel.
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    More info that was promised-
    What is likely happening is that the sharks can smell the blood but it's just not in a quantity that is interesting to them especially since they don't love human blood that much (btw, I spoke with a marine biologist and mammal blood is all the same from a chemical marker stand point so cow blood is a suitable substitute for human blood). If I did the experiment again, I would want to test human blood vs. fish blood.

    This is the most definitive study done to date in a control lab environment on what is least and most interesting to them: The Biology of Sharks and Rays Peter A. Klimley and Steven Oerding; ISBN-13: 9780226442495. Particularly pages 134-140. Figure 6.7; Table 6.2


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    Summary: I've always wanted to test if sharks can really smell a single drop of blood in the water from 1 mile away. So I went to the Bahamas in shark infested waters and set up an experiment to get to the bottom of things.

    They are soft- teespring.com/stores/markrober

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  • Science and Technology Science and Technology

Comments • 47 481

  • Amber Tanner
    Amber Tanner  25 less than a minute back

    Next Video: crawling into a bear cave covered in fish to see if bears actually eat fish 🐟🤨

    • Evan Antonola
      Evan Antonola  3 hours back

      The craziest thing you would do for the Youtube views and Subs. Money is everything

      • Darkzyz-_-
        Darkzyz-_-  4 hours back

        We gonna y’all about how he used a Minecraft button sound

        • Justin S.
          Justin S.  5 hours back

          Anyone else think the button sounded like a Minecraft button?

          • panha horl
            panha horl  5 hours back


            • chela2014
              chela2014  6 hours back

              I have an understanding that sharks are not interested in the blood itself but the weak victim that is leaving this trail of blood, so i have researched some steps in the shark “attacks” so step 1 is sense the blood and head toward it, step 2 is investigate if victim is weak and or willing to pick a fight, step 3 (rare) bite and swing “violently” {because it looks like some sort of sea animal to them} side to side (supposedly to taste the meat), step 4 eat if it is fish, or leave it alone if it isnt [human, non sea animal, etc]. So i dont know how right this research is, but it kind of makes sense to me because most sharks dont even care for free divers and i think they only attack because they are humgry and seeing something moving in the water makes sense to them to go for it, but then again im not an expert. Cool experiment though it was interesting to see what attracted them and what didnt.

              • Under Doggg
                Under Doggg  6 hours back

                That dudes got some nads.

                • Denise Pena
                  Denise Pena  6 hours back

                  Next video:testing if I slap my mom would she slap me back

                  • MBethel
                    MBethel  7 hours back

                    Nice video, key note (If you are from the Bahamas, you are called a BAHAMIAN) its pronounced (ba-hey-me-an) not w/e you said lol 8:30

                    • aerogso
                      aerogso  8 hours back

                      he lucky he survived WOW :O

                      • 1,000 Likes With 0 Videos

                        Imagine a great white shower up

                        • Pablo Jimenez
                          Pablo Jimenez  9 hours back

                          dont mess whith sharks

                          • sleepy bunny
                            sleepy bunny  10 hours back

                            I think I know why the sharks were not attracted to the blood in the second experiment. This is just based off of observations, and I don't mean to debunk your experiment as I respect it entirely. I still dropped a big like and even subscribed!


                            You used two different types of blood in the experiment. The cow blood was successful, but the human blood wasn't. I think that to confirm if sharks were attracted to human blood, I think you should use the human blood instead of cow blood in the first experiment to see if the sharks are really attracted to human blood. (So I guess sharks would eat cows?)

                            Secondly: the rates were different. You mentioned that in the second video, the blood was slower than in the first experiment. What if you keep the speed of the blood pump from the first experiment consistent with the second blood experiment and then leave the other blood pumping at the slower rate. I'm not sure if you're 100% understanding what I am saying, but I am trying to explain this as clearly as possible as experiments can get confusing.

                            For a followup experiment, test to see what kinds of blood sharks are interested in. We do know that they like cow blood, and not sure about human blood as the experiment was a bit inconsistent...so why not try different types of blood? (Maybe use seal blood as sharks are obviously attracted to the seals, and then try cow blood again, human blood, and so on).

                            I hope this comment was helpful. I LOVE your videos, and keep up with the cool experiments!

                            • FloatingCookie
                              FloatingCookie  11 hours back

                              Was that a Minecraft button noise I heard?

                              • Episode Girl
                                Episode Girl  11 hours back

                                “They’re not gonna just jump out of the water “
                                Shark: “Hold my beer “

                                • Doodles Experiment
                                  Doodles Experiment  11 hours back

                                  Itu adalah video yang menyenangkan. Saya menyukainya.

                                  • dragon playz
                                    dragon playz  11 hours back

                                    him: were gonna just put pee
                                    lifeguard: *freaks out that theres pee

                                    • Kindalwindal tv
                                      Kindalwindal tv  11 hours back

                                      Was it just me or did anyone else notice that thing behind his ear

                                      • E & E & Nguyen
                                        E & E & Nguyen  12 hours back

                                        Why not experience on white shark? These shark is known for being friendly and not bite

                                        • Julia MacIntosh
                                          Julia MacIntosh  12 hours back

                                          𝗦𝗶𝗿 𝘁𝗵𝗶𝘀 𝗶𝘀 𝗮 𝗠𝗰𝗗𝗼𝗻𝗮𝗹𝗱’𝘀 𝗱𝗿𝗶𝘃𝗲𝗧𝗵𝗿𝘂

                                          • Dante Thanhardt
                                            Dante Thanhardt  13 hours back

                                            The reason they didn't visit is because it is mixed blood types which cancels out the other ones if you had one blood type it would maybe work I am not curtain

                                            • Landon Burkey
                                              Landon Burkey  13 hours back

                                              Water pollution!

                                              • STAN Tz
                                                STAN Tz  13 hours back

                                                Try again around great white sharks.,and please guys don't forgert to share😎

                                                • Kobe The Adorable Doggy
                                                  Kobe The Adorable Doggy  14 hours back

                                                  What are lemons doing in the water?
                                                  and tigers?

                                                  • humblelongboards
                                                    humblelongboards  14 hours back

                                                    America Online shirt?

                                                    • The Unholy Sock
                                                      The Unholy Sock  15 hours back

                                                      Why would you do this thoe?

                                                      • XxXDisco PotatoXxX
                                                        XxXDisco PotatoXxX  15 hours back

                                                        you think theyre more attracted to the boat because they would consider the boat as more of a threat because it is bigger.

                                                        • Nora Obado
                                                          Nora Obado  16 hours back

                                                          People say that sharks are more interested in fish then people and they are not scary they are interesting

                                                          • Lexus_ Nigel
                                                            Lexus_ Nigel  16 hours back

                                                            Maybe this failed a bit because some people may be giving these sharks cows as food everyday so they r more familiar with that scent than the human's

                                                            • Luka Vlahovic
                                                              Luka Vlahovic  17 hours back

                                                              I considered buying those headphones but then I saw the price

                                                              • Raymond Ho
                                                                Raymond Ho  17 hours back

                                                                I love de water 💦 cooler i wise I can go

                                                                • Man City Fan Man City
                                                                  Man City Fan Man City  17 hours back


                                                                  • Ella
                                                                    Ella  17 hours back

                                                                    Ohmy. He just scratched his' back with his urine-filled gloves HAHAHAHAAH

                                                                    • Ella
                                                                      Ella  17 hours back

                                                                      Wow. How many years you planned and studied this.

                                                                      • kriloxta3000
                                                                        kriloxta3000  18 hours back

                                                                        Sharks are better than humans

                                                                        • kriloxta3000
                                                                          kriloxta3000  18 hours back

                                                                          I swim with sharks in the wild and never got attacked by 6 fifteen foot tiger sharks

                                                                          • Diego Biselli
                                                                            Diego Biselli  19 hours back

                                                                            A bucket of blood😐

                                                                            • Daniel James Seavey
                                                                              Daniel James Seavey  19 hours back

                                                                              It's like your testing in you'll die with a gunshot 🤦🏻‍♀

                                                                              • BuddyOnFever
                                                                                BuddyOnFever  20 hours back

                                                                                4 bag of blood.. I know this can be a good experiment... But that can save lots of people... Like the platelet x4, packed cell x 4, plasma x 4..wow..

                                                                                • The lunar'S bOi
                                                                                  The lunar'S bOi  20 hours back

                                                                                  when button pressed... minecraft button sound comes out

                                                                                  • Bacon YT
                                                                                    Bacon YT  20 hours back

                                                                                    Why urine?

                                                                                    • Fajar Fathoni12
                                                                                      Fajar Fathoni12  20 hours back

                                                                                      Experimen crazy

                                                                                      • william cutsforth
                                                                                        william cutsforth  22 hours back

                                                                                        The video is a suicide mission

                                                                                        • torio vittorio
                                                                                          torio vittorio  22 hours back


                                                                                          • Princess of natural HELLO


                                                                                            • Princess of natural HELLO


                                                                                              • Princess of natural HELLO


                                                                                                • Princess of natural HELLO