Pratica di Shadowing: Why no aquarium has a great white shark - Impara a parlare inglese con i video
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There are some shark species that seem to do okay in aquariums.
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You'll see a lot of nurse sharks, zebra sharks, some reef sharks and sand tiger sharks, but not the great white.
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For decades, aquariums have tried to contain the world's largest predatory fish.
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Institutions like Marineland, SeaWorld and the Steinhardt Aquarium repeatedly took in white sharks during the 1970s, 80s and 90s, at times drawing huge crowds.
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But they never lasted long.
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Some needed help swimming.
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None of them would eat.
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The longest one lasted was just 16 days.
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A 1984 report by the Steinhardt Aquarium put it this way.
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In most cases, it could be said that all of these captive sharks were merely in the process of dying, with some taking longer than others.
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They had constructed an elaborate transport tank with a harness and IV fluids, but still couldn't keep the sharks alive.
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It wasn't until 2004 that the Monterey Bay Aquarium proved
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that it was possible to keep white sharks for at least six months.
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It took a massive effort, and no one's done it since.
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Our approach was one of sort of a systematic, logical sequence of things leading up to our success, and it started with designing the tank.
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The Monterey Bay Aquarium had a million -gallon egg -shaped tank, 35 feet deep, designed for open -ocean animals like tuna and sharks.
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So you need a big tank.
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You also need a small shark.
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Adult great whites reach 15 feet on average.
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The Monterey Bay Aquarium nabbed one in 2004 that was 4 feet 4 inches, less than a year old.
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That made it easier to move and easier to keep.
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When they're young, they feed on fish.
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And as they get older, they transition to feeding more on mammals.
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And so we were targeting the age bracket where we were more able to feed their natural diet it.
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And once they collected the shark, they didn't take it straight to the aquarium.
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Instead, the Monterey Bay team set up a four million gallon pen right there in the ocean.
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That way they could monitor the shark and see
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if it would feed before they moved it into a transport tank to travel from Southern California, where the sharks were born, up to the aquarium.
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Sharks, like all fish, need to have water continually passing through their gills in order to get oxygen.
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Most species can open and close their mouths to pump water through, but white sharks and a couple dozen other species don't do that.
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To breathe, they have to move forward through the water with their mouths open.
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That's why white sharks start to weaken as soon as they're caught in the net.
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And that's why they needed a custom built transport tank for mobile life support.
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Everything from oxygen sensors and video cameras and lighting and filtration systems
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that were needed for the what turned out to roughly be nine to 11 hour transport time.
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Aquarium attendance jumped 30 % while the shark was on display.
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After six and a half months, they decided to release it because it had killed two other sharks.
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Over the next six years, the aquarium displayed five more baby white sharks.
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Some they paid fishermen to hand over, some they caught themselves.
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Their stays ranged from just 11 days up to five months.
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The Monterey Bay Aquarium had succeeded in doing what no one else could.
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But it did take a toll on the sharks.
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They developed visible sores from bumping into the sides of the tank.
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We actually snuck in with photographers
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and took pictures of the sharks as they were beginning to trit and fail due to constant scraping against the wall, basically.
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As we viewed it, it was a vase of flowers that would be kept for the visitors.
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Historically, aquariums kept sharks that lived near the seabed or near reefs.
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That makes sense it's easier to recreate those habitats in a tank.
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But in recent decades, aquariums have wanted to bring in bigger, more pelagic sharks, those that spend time roaming the open ocean.
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They've even been able to exhibit the largest shark in the world, the whale shark, if they have a big enough tank.
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But pelagic sharks are used to being able to swim long distances without obstructions, changing directions only as they please.
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So the faster moving sharks like the white shark, mako shark, and blue shark, They have trouble with walls when they're put in a tank.
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That's what was happening with the Monterey Bay Aquarium's sixth white shark in 2011.
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They decided to release it after 55 days and its tracking tag revealed that the shark died shortly after being released.
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They're not sure why.
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But since then, they haven't tried to bring in another great white shark.
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It's a very, very, very resource intensive program
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and we felt like we had accomplished our goal of introducing the general public to a live white shark.
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It took a huge, carefully planned system to keep a white shark alive.
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And even then, the sharks didn't quite fit there.
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We can't seem to stop trying though.
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Earlier this year, an 11 and a half foot great white shark was taken to an aquarium in Okinawa,
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Japan, after getting caught in a fisherman's net.
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It was the only adult white shark ever to be put on display.
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And within three days, it was dead.
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I wanted to show you a great resource online called the Biodiversity Heritage Library.
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It's the product of a couple dozen museums and libraries, all agreeing to scan millions of pages from books related to biodiversity.
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They've got a bunch of great albums on Flickr, including one that's all about sharks.
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Some of these go back to the 16th and 17th centuries, back when naturalists used to call sharks see dogs,
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which is funny because as we now know, sharks were roaming the oceans for about 300 million years before the first mammals showed up.
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Vocabolario e note di pronuncia per questa lezione
Questa lezione di conversazione si basa sul video “Why no aquarium has a great white shark”. Le parole che ritornano più spesso: shark, aquarium, tank, Monterey, Bay. Questo video contiene 27 frasi e 989 parole da ripetere con lo shadowing. Il parlato dura 5:49. Chi parla ha un ritmo naturale di circa 170 parole al minuto, vicino a una conversazione quotidiana. Solo il 76% delle parole rientra nelle 3.000 più comuni dell’inglese, quindi il lessico è impegnativo.
Vocaboli chiave di questo video
15 parole del video che vale la pena imparare, con pronuncia e significato:
| Parola | Pronuncia | Significato |
|---|---|---|
| aquarium sostantivo | /əˈkwɛɹ.i.jəm/ | acquario |
| resource sostantivo | /ɹɪˈzɔːs/ | risorsa |
| oxygen sostantivo | /ˈɑksɪd͡ʒən/ | ossigeno |
| swim verbo | /swɪm/ | nuotare, natare |
| reef sostantivo | /ɹiːf/ | scogliera, barriera |
| shortly avverbio | /ˈʃɔɹtli/ | subito |
| carefully avverbio | /ˈkɛɹf(ə)li/ | minuziosamente, accuratamente |
| transition sostantivo | /tɹænˈzɪʃ.ən/ | transizione |
| sand sostantivo | /sænd/ | sabbia, rena |
| custom sostantivo | /ˈkʌstəm/ | usanza, costume |
| reveal verbo | /ɹɪˈviːl/ | rivelare, gettare la maschera |
| flower sostantivo | /ˈfloʊɚ/ | fiore |
| institution sostantivo | /ˌɪn.stɪˈtʃuː.ʃən/ | istituzione |
| nurse sostantivo | /nɝs/ | infermiera, infermiere |
| visible aggettivo | /ˈvɪzɪb(ə)l/ | visibile |
I phrasal verb che sentirai
| Parola | Pronuncia | Significato |
|---|---|---|
| hand over verbo | cedere, trasferire | |
| pass through verbo | trapassare | |
| set up verbo | /ˌsɛt ˈʌp/ | preparare, installare |
La grammatica di questo video
Le strutture che chi parla usa di più, con le parole esatte del video:
| Struttura | Nel video |
|---|---|
| Forma passiva be + participio passato — conta ciò che accade, non chi lo fa | could be said · were born · were needed |
| Present perfect have/has + participio passato — un’azione passata che conta ancora adesso | have tried · have wanted · They've even been |
Pronuncia a cui fare attenzione
Chi parla usa 14 contrazioni e forme ridotte, come they're, didn't, they've. Pronunciale nella forma breve, così come le senti.
- I suoni “th”: sixth /sɪksθ/, breathe /bɹiːð/
- I suoni “sh” e “zh”: shortly /ˈʃɔɹtli/, transition /tɹænˈzɪʃ.ən/, institution /ˌɪn.stɪˈtʃuː.ʃən/, accomplish /əˈkɑm.plɪʃ/, obstruction /əbˈstɹʌk.ʃən/
- Parole lunghe — attenzione all’accento: aquarium /əˈkwɛɹ.i.jəm/, institution /ˌɪn.stɪˈtʃuː.ʃən/, photographer /fəˈtɑ.ɡɹə.fɚ/, repeatedly /ɹɪˈpiːtɪdli/, elaborate /ɪˈlæb.ə.ɹeɪt/
I suoni difficili per chi parla italiano:
- /h/ — va soffiata, non è muta: habitat /ˈhæb.ɪ.tæt/, harness /ˈhɑɹ.nəs/
- Consonante finale — senza aggiungere una vocale dopo: resource /ɹɪˈzɔːs/, reef /ɹiːf/, sand /sænd/, nurse /nɝs/, sixth /sɪksθ/
- /æ/ — più aperta della “e”: gallon /ˈɡælən/, transition /tɹænˈzɪʃ.ən/, sand /sænd/, scan /skæn/, elaborate /ɪˈlæb.ə.ɹeɪt/
Come esercitarsi con questo video
- Ascolta tutto il video una volta senza parlare e annota le parole che non conosci.
- Inizia a velocità 0,75×, fai shadowing frase per frase e torna alla velocità normale quando diventa facile.
- Registrati e confronta con l’originale, facendo attenzione a parole come aquarium, resource, oxygen.
Cos'è la tecnica dello Shadowing?
Shadowing è una tecnica di apprendimento delle lingue supportata da studi scientifici, originariamente sviluppata per la formazione dei traduttori professionisti e resa popolare dal poliglotta Dr. Alexander Arguelles. Il metodo è semplice ma potente: ascolti un audio in inglese di madrelingua e lo ripeti immediatamente ad alta voce — come un'ombra che segue il parlante con un ritardo di solo 1–2 secondi. A differenza dell'ascolto passivo o degli esercizi di grammatica, lo shadowing costringe il tuo cervello e i muscoli della bocca a elaborare e riprodurre simultaneamente i modelli di discorso reale. La ricerca dimostra che migliora significativamente la precisione della pronuncia, l'intonazione, il ritmo, il discorso connesso, la comprensione dell'ascolto e la fluidità del parlato — rendendolo uno dei metodi più efficaci per la preparazione alla prova di speaking dell'IELTS e per la comunicazione reale in inglese.