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  • NARRATOR: Next day back in the Polynesian town of Papetoai,

  • they visit an expert who ID sharks by their fins.

  • So we were hoping to see if you could look

  • through some of your databases.

  • NARRATOR: Shark scientist Nicolas

  • Buray keeps a photo archive of Tahitian tiger sharks.

  • That's cool.

  • NARRATOR: And it's been growing.

  • MAN: How many sharks do you have in your database?

  • So in our database, we have around 55

  • different tiger sharks.

  • This is new.

  • For 10 years, I saw maybe two only.

  • Right now, since three, four, five years,

  • we are more and more tiger sharks.

  • NARRATOR: Local divers send Nicolas dorsal fin shots.

  • He enters them into the archive and identifies the individuals.

  • So you're looking at the stripe patterns?

  • Yeah, the stripe.

  • When a shark's growing, they keep the same stripe.

  • NARRATOR: All of the newcomers are females.

  • Time to find out if they have a match.

  • This one here is Kamakai.

  • And the dorsal is pretty distinct.

  • She is mature, so there's some scarring.

  • NARRATOR: During mating, male sharks

  • bite the females, which is why female shark skin

  • has evolved to be super thick.

  • Female tigers reach sexual maturity at about 9 years.

  • There's no doubt Kamakai has mated.

  • Clearly a big female tiger shark.

  • But do you recognize her?

  • Or is she in your database?

  • I mean, no. No.

  • Not in my database.

  • ANDY: OK.

  • No.

  • This one is, I'm sure I don't know it.

  • NARRATOR: Now they compare pictures

  • from the database with the big females from the night dive.

  • This is the biggest one that we've seen there.

  • We were thinking possibly the same shark.

  • No.

  • For me, it's not the same.

  • So this one I think is not the same.

  • NARRATOR: Andy and Kori have just

  • added three new large females to Nico's growing database.

  • Do have the other side?

  • No.

  • NARRATOR: That makes more than 40 large sexually mature

  • female tiger sharks, most with dorsal fins

  • chewed up and scarred for mating.

  • Looks like just a shredded fin.

  • NARRATOR: Everything points to a tiger shark mating ground.

  • An area with males must be nearby.

  • So that means those other hot spots out there, other places

  • where these large tiger sharks are hanging out

  • that haven't been studied yet.

  • NARRATOR: If they can find it, perhaps Kamakai will

  • be there looking for a mate.

NARRATOR: Next day back in the Polynesian town of Papetoai,

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虎鯊數據庫|世界最大的虎鯊? (Tiger Shark Database | World's Biggest Tiger Shark?)

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    林宜悉 發佈於 2021 年 01 月 14 日
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