No one can figure out how eels have sex - Lucy Cooke

2,623,606 views ใƒป 2020-07-27

TED-Ed


์•„๋ž˜ ์˜๋ฌธ์ž๋ง‰์„ ๋”๋ธ”ํด๋ฆญํ•˜์‹œ๋ฉด ์˜์ƒ์ด ์žฌ์ƒ๋ฉ๋‹ˆ๋‹ค.

๋ฒˆ์—ญ: Hyejin Yu ๊ฒ€ํ† : JY Kang
00:06
From Ancient Greece to the 20th century,
0
6843
3301
๊ณ ๋Œ€ ๊ทธ๋ฆฌ์Šค ์‹œ๋Œ€์—์„œ 20์„ธ๊ธฐ๊นŒ์ง€
00:10
Aristotle, Sigmund Freud, and numerous other scholars
1
10144
4100
์•„๋ฆฌ์Šคํ† ํ…”๋ ˆ์Šค, ์ง€๊ทธ๋ฌธํŠธ ํ”„๋กœ์ด๋“œ์™€ ๊ทธ์™ธ ์—ฌ๋Ÿฌ ํ•™์ž๋“ค์€
00:14
were all looking for the same thing:
2
14244
3090
๊ฐ™์€ ๊ฒƒ์„ ์ฐพ๊ณ  ์žˆ์—ˆ์Šต๋‹ˆ๋‹ค.
00:17
eel testicles.
3
17334
2450
๋ฐ”๋กœ ์žฅ์–ด์˜ ๊ณ ํ™˜์„ ์ฐพ๊ณ  ์žˆ์—ˆ์ฃ .
00:19
Freshwater eels, or Anguilla Anguilla, could be found in rivers across Europe,
4
19784
6132
์œ ๋Ÿฝ์˜ ๊ฐ•์—์„œ๋Š” ๋ฏผ๋ฌผ์žฅ์–ด ๋˜๋Š” ์œ ๋Ÿฝ์‚ฐ ๋ฑ€์žฅ์–ด๋ฅผ ๋ฐœ๊ฒฌํ•  ์ˆ˜ ์žˆ์Šต๋‹ˆ๋‹ค.
00:25
but no one had ever seen them mate.
5
25916
2980
ํ•˜์ง€๋งŒ ์•„๋ฌด๋„ ์žฅ์–ด์˜ ์ง์ฐŸ๊ธฐ๋ฅผ ๋ณธ ์ ์ด ์—†์—ˆ์Šต๋‹ˆ๋‹ค.
00:28
And despite countless dissections,
6
28896
2360
์ˆ˜๋งŽ์€ ํ•ด๋ถ€ ์กฐ์‚ฌ์—๋„ ๋ถˆ๊ตฌํ•˜๊ณ 
00:31
no researcher could find eel eggs or identify their reproductive organs.
7
31256
6470
์–ด๋–ค ์—ฐ๊ตฌ์ž๋„ ์žฅ์–ด์˜ ์•Œ์ด๋‚˜ ์ƒ์‹๊ธฐ๊ด€์„ ์ฐพ์„ ์ˆ˜ ์—†์—ˆ์Šต๋‹ˆ๋‹ค.
00:37
Devoid of data, naturalists proposed various eel origin stories.
8
37726
5780
์ •๋ณด์˜ ๋ถ€์กฑ์œผ๋กœ
์ž์—ฐํ•™์ž๋“ค์€ ์žฅ์–ด์˜ ๊ธฐ์›์— ๊ด€ํ•œ ๋‹ค์–‘ํ•œ ๊ฐ€์„ค์„ ์„ธ์› ์Šต๋‹ˆ๋‹ค.
00:43
Aristotle suggested that eels spontaneously emerged from mud.
9
43506
5251
์•„๋ฆฌ์Šคํ† ํ…”๋ ˆ์Šค๋Š” ์žฅ์–ด๋Š” ์ง„ํ™์—์„œ ์ž์—ฐ์ ์œผ๋กœ ์ƒ๊ฒจ๋‚ฌ๋‹ค๊ณ  ํ–ˆ์Šต๋‹ˆ๋‹ค.
00:48
Pliny the Elder argued eels rubbed themselves against rocks,
10
48757
4804
ํ”Œ๋ฆฌ๋‹ˆ์šฐ์Šค๋Š” ์žฅ์–ด๊ฐ€ ์ž์‹ ์˜ ๋ชธ์„ ๋Œ์— ๋น„๋น„๋ฉด
00:53
and the subsequent scrapings came to life.
11
53561
3830
๊ทธ ๋ถ€์Šค๋Ÿฌ๊ธฐ๊ฐ€ ์žฅ์–ด๊ฐ€ ๋œ๋‹ค๊ณ  ์ฃผ์žฅํ•˜์˜€์Šต๋‹ˆ๋‹ค.
00:57
Eels were said to hatch on rooftops, manifest from the gills of other fish,
12
57391
5357
์žฅ์–ด์˜ ์•Œ์€ ์ง€๋ถ•์—์„œ ๋ถ€ํ™”ํ•œ๋‹ค๋Š” ์„ค
๋ฌผ๊ณ ๊ธฐ์˜ ์•„๊ฐ€๋ฏธ์—์„œ ํƒ„์ƒ ํ•œ๋‹ค๋Š” ์„ค
01:02
and even emerge from the bodies of beetles.
13
62748
3988
์‹ฌ์ง€์–ด ๋”ฑ์ •๋ฒŒ๋ ˆ์˜ ๋ชธ์—์„œ ์ƒ๊ฒจ๋‚œ๋‹ค๋Š” ์„ค๋„ ์žˆ์—ˆ์Šต๋‹ˆ๋‹ค.
01:06
But the true story of eel reproduction is even more difficult to imagine.
14
66736
5662
ํ•˜์ง€๋งŒ ์žฅ์–ด ๋ฒˆ์‹์˜ ์‹ค์ฒด๋Š” ์ƒ์ƒ์กฐ์ฐจ ์–ด๋ ต์Šต๋‹ˆ๋‹ค.
01:12
And to solve this slippery mystery,
15
72398
2700
์ด ๋ฏธ๋„๋Ÿฝ๊ณ  ์‹ ๋น„ํ•œ ๋ฌผ์ฒด์˜ ์ •์ฒด๋ฅผ ๋ฐํžˆ๊ธฐ ์œ„ํ•ด
01:15
scholars would have to rethink centuries of research.
16
75098
4170
ํ•™์ž๋“ค์€ ์ˆ˜ ์„ธ๊ธฐ ๋™์•ˆ์˜ ์—ฐ๊ตฌ๋ฅผ ๋‹ค์‹œ ์ƒ๊ฐํ•ด์•ผ ํ–ˆ์Šต๋‹ˆ๋‹ค.
01:19
Today, we know the freshwater eel lifecycle has five distinct stages:
17
79268
6415
์˜ค๋Š˜๋‚ , ์žฅ์–ด์˜ ์ƒ์•  ์ฃผ๊ธฐ๋Š” ๋šœ๋ ทํ•œ 5๋‹จ๊ณ„๋กœ ์•Œ๋ ค์ ธ ์žˆ์Šต๋‹ˆ๋‹ค.
01:25
larval leptocepheli, miniscule glass eels, adolescent elvers,
18
85683
7210
๋Œ“์žŽ์žฅ์–ด, ์‹ค์žฅ์–ด, ๋ฏธ์„ฑ์ˆ™ ์žฅ์–ด,
01:32
older yellow eels, and adult silver eels.
19
92893
4507
์„ฑ์ˆ™๋œ ํ™ฉ๋ฑ€์žฅ์–ด, ์„ฑ์ฒด ์€๋ฑ€์žฅ์–ด
01:37
Given the radical physical differences between these phases,
20
97400
3920
๊ฐ ๋‹จ๊ณ„๋งˆ๋‹ค ๋ชธ์˜ ๋ณ€ํ™”๊ฐ€ ๊ธ‰๊ฒฉํ•ด์„œ
01:41
youโ€™d be forgiven for assuming these are different animals.
21
101320
3880
์•„๋งˆ ๋‹ค๋ฅธ ์ข…๋ฅ˜์˜ ๋™๋ฌผ์ด๋ผ๊ณ  ์ƒ๊ฐํ•  ์ˆ˜ ์žˆ์Šต๋‹ˆ๋‹ค.
01:45
In fact, thatโ€™s exactly what European naturalists thought.
22
105200
4570
์‚ฌ์‹ค, ์œ ๋Ÿฝ ์ž์—ฐํ•™์ž๋“ค๋„ ๊ทธ๋ ‡๊ฒŒ ์ƒ๊ฐํ–ˆ์ฃ .
01:49
Researchers were aware of leptocepheli and glass eels,
23
109770
4414
์—ฐ๊ตฌ์ž๋“ค์€ ๋Œ“์žŽ์žฅ์–ด์™€ ์‹ค์žฅ์–ด์— ๋Œ€ํ•ด์„œ๋Š” ์•Œ๊ณ  ์žˆ์—ˆ์Šต๋‹ˆ๋‹ค.
01:54
but no one guessed they were related to the elvers and yellow eels
24
114184
4100
ํ•˜์ง€๋งŒ ์•„๋ฌด๋„ ๋ฏธ์„ฑ์ˆ™ ์žฅ์–ด์™€ ํ™ฉ๋ฑ€์žฅ์–ด๋ฅผ ์—ฐ๊ด€ ์ง€์„ ์ˆ˜ ์—†์—ˆ์Šต๋‹ˆ๋‹ค.
01:58
living hundreds of kilometers upstream.
25
118284
2860
100 km๋‚˜ ๋–จ์–ด์ง„ ์ƒ๋ฅ˜์— ์‚ด๊ธฐ ๋•Œ๋ฌธ์ด์ฃ .
02:01
Confusing matters more, eels donโ€™t develop sex organs until late in life.
26
121144
5710
๋”์šฑ ๋‹นํ™ฉ์Šค๋Ÿฌ์šด ์‚ฌ์‹ค์€
์žฅ์–ด์˜ ์ƒ์‹๊ธฐ๋Š” ์•„์ฃผ ๋Šฆ๊ฒŒ ์ƒ๊ธด๋‹ค๋Š” ๊ฒƒ์ž…๋‹ˆ๋‹ค.
02:06
And the entirety of their time in the rivers of Europe
27
126854
2960
๊ทธ๋ฆฌ๊ณ  ์žฅ์–ด๊ฐ€ ์œ ๋Ÿฝ์˜ ๊ฐ•์—์„œ ์„œ์‹ํ•˜๋Š” ์ „์ฒด ๊ธฐ๊ฐ„์€
02:09
is essentially eel adolescence.
28
129814
2940
์žฅ์–ด์˜ ์ฒญ์†Œ๋…„๊ธฐ์ž…๋‹ˆ๋‹ค.
02:12
So when do eels reproduce, and where do they do it?
29
132754
5125
๊ทธ๋Ÿผ ์žฅ์–ด๋Š” ์–ธ์ œ ์–ด๋””์—์„œ ๋ฒˆ์‹์„ ํ•˜๋Š” ๊ฑธ๊นŒ์š”?
02:17
Despite its name, the life of a freshwater eel actually begins
30
137879
5206
์ด๋ฆ„๊ณผ ๋‹ฌ๋ฆฌ ๋ฏผ๋ฌผ์žฅ์–ด์˜ ์‚ถ์€
02:23
in the salty waters of the Bermuda Triangle.
31
143085
3520
๋ฒ„๋ฎค๋‹ค ํŠธ๋ผ์ด์•ต๊ธ€์˜ ๊นŠ์€ ์†Œ๊ธˆ๋ฌผ์—์„œ ์‹œ์ž‘ํ•ฉ๋‹ˆ๋‹ค.
02:26
At the height of the annual cyclone season,
32
146605
2700
์—ฐ์ค‘ ํƒœํ’์ด ํ•œ์ฐฝ์ผ ๋•Œ
02:29
thousands of three-millimeter eel larvae
33
149305
3110
3 mm ํฌ๊ธฐ์˜ ๋Œ“์žŽ๋ฑ€์žฅ์–ด ์ˆ˜์ฒœ ๋งˆ๋ฆฌ๊ฐ€ ์‚ฌ๋ฅด๊ฐ€์†Œ ๋ฐ”๋‹ค๋ฅผ ๋น ์ ธ๋‚˜๊ฐ‘๋‹ˆ๋‹ค.
02:32
drift out of the Sargasso Sea.
34
152415
2530
02:34
From here, they follow migration paths to North America and Europeโ€”
35
154945
4495
๋Œ“์žŽ์žฅ์–ด๋Š” ์ด๊ณณ์œผ๋กœ๋ถ€ํ„ฐ ๋ถ์•„๋ฉ”๋ฆฌ์นด์™€ ์œ ๋Ÿฝ์œผ๋กœ ์ด๋™ํ•˜์ฃ .
02:39
continents that were much closer
36
159440
2080
๊ณผ๊ฑฐ์—๋Š” ๋Œ€๋ฅ™ ๊ฐ„์˜ ๊ฑฐ๋ฆฌ๊ฐ€ ํ›จ์”ฌ ๊ฐ€๊นŒ์› ์Šต๋‹ˆ๋‹ค.
02:41
when eels established these routes 40 million years ago.
37
161520
4711
์žฅ์–ด๊ฐ€ ์ด ์ด๋™ ๊ฒฝ๋กœ๋ฅผ ์ฐพ๊ฒŒ ๋œ 4์ฒœ๋งŒ๋…„ ์ „์—๋Š” ๋ง์ด์ฃ .
02:46
Over the next 300 days, Anguilla Anguilla larvae ride the ocean currents
38
166231
6098
์•ฝ 300์ผ์— ๊ฑธ์ณ์„œ ์œ ๋Ÿฝ์‚ฐ ๋Œ“์žŽ์žฅ์–ด๋Š” ํ•ด๋ฅ˜๋ฅผ ํƒ€๊ณ 
02:52
6,500 km to the coast of Europeโ€”
39
172329
4192
์œ ๋Ÿฝ ํ•ด์•ˆ๊นŒ์ง€ 6,500 km๋ฅผ ์ด๋™ํ•˜๋Š”๋ฐ
02:56
making one of the longest known marine migrations.
40
176521
4148
์ด๊ฒƒ์ด ๊ฐ€์žฅ ๊ธด ํ•ด์–‘ ์ด๋™ ๊ฒฝ๋กœ ์ค‘ ํ•˜๋‚˜์ž…๋‹ˆ๋‹ค.
03:00
By the time they arrive, theyโ€™ve grown approximately 45 mm,
41
180669
4930
๋Œ“์žŽ์žฅ์–ด๊ฐ€ ์œ ๋Ÿฝ์— ๋„์ฐฉํ–ˆ์„ ๋•Œ๋Š” ์•ฝ 45 mm๊ฐ€ ๋ฉ๋‹ˆ๋‹ค.
03:05
and transformed into semi-transparent glass eels.
42
185599
4383
๊ทธ๋ฆฌ๊ณ  ํˆฌ๋ช…ํ•œ ์‹ค์žฅ์–ด๋กœ ํƒˆ๋ฐ”๊ฟˆํ•˜์ฃ .
03:09
Itโ€™s not just their appearance thatโ€™s changed.
43
189982
2430
๋‹จ์ง€ ๊ฒ‰๋ชจ์Šต๋งŒ ๋ฐ”๋€Œ๋Š” ๊ฒƒ์€ ์•„๋‹™๋‹ˆ๋‹ค.
03:12
If most marine fish entered brackish coastal waters,
44
192412
3750
๋Œ€๋ถ€๋ถ„์˜ ํ•ด์–‘ ์–ด๋ฅ˜๋“ค์€ ๋ฏผ๋ฌผ๋กœ ์ง„์ž…ํ•  ๋•Œ
03:16
their cells would swell with freshwater in a lethal explosion.
45
196162
5018
์„ธํฌ๊ฐ€ ๋‹ด์ˆ˜๋กœ ๋ถ€ํ’€์–ด์˜ฌ๋ผ ์น˜๋ช…์ ์ธ ํญ๋ฐœ์ด ์žˆ์„ ์ˆ˜ ์žˆ์Šต๋‹ˆ๋‹ค.
03:21
But when glass eels reach the coast,
46
201180
2382
ํ•˜์ง€๋งŒ ์‹ค์žฅ์–ด๋Š” ํ•ด์•ˆ๊ฐ€์— ๋„๋‹ฌํ–ˆ์„ ๋•Œ
03:23
their kidneys shift to retain more salt
47
203562
2878
์‹ ์žฅ์ด ๋ณ€ํ˜•๋˜์–ด ์†Œ๊ธˆ์„ ๋” ์ €์žฅํ•  ์ˆ˜ ์žˆ๊ฒŒ ๋ฉ๋‹ˆ๋‹ค.
03:26
and maintain their bloodโ€™s salinity levels.
48
206440
2750
๊ทธ๋ฆฌ๊ณ  ํ˜ˆ์•ก์˜ ์—ผ๋ถ„๋†๋„๋ฅผ ์กฐ์ •ํ•˜์ง€์š”.
03:29
Swarms of these newly freshwater fish migrate up streams and rivers,
49
209190
5279
๋ฏผ๋ฌผ๋กœ ์ง„์ž…ํ•œ ์‹ค์žฅ์–ด ๋•Œ๋Š” ๊ฐœ์šธ์—์„œ ๊ฐ•์œผ๋กœ ์ด๋™ํ•ฉ๋‹ˆ๋‹ค.
03:34
sometimes piling on top of each other to clear obstacles and predators.
50
214469
5424
๊ฐ™์ด ๊ฒน์ณ ๋ชจ์—ฌ ์žฅ์• ๋ฌผ์„ ์ œ๊ฑฐํ•˜๊ฑฐ๋‚˜ ํฌ์‹์ž๋กœ๋ถ€ํ„ฐ ๋น ์ ธ๋‚˜๊ฐ€๊ธฐ๋„ ํ•ฉ๋‹ˆ๋‹ค.
03:39
Those that make it upstream develop into opaque elvers.
51
219893
4727
์ƒ๋ฅ˜์— ๋„์ฐฉํ•œ ์‹ค์žฅ์–ด๋Š” ๋ฏธ์„ฑ์ˆ™ ์žฅ์–ด๋กœ ์ง„ํ™”ํ•ฉ๋‹ˆ๋‹ค.
03:44
Having finally arrived in their hunting grounds,
52
224620
2810
๋“œ๋””์–ด ์‚ฌ๋ƒฅํ„ฐ์— ๋„์ฐฉํ–ˆ๋„ค์š”.
03:47
elvers begin to eat everything they can fit into their mouths.
53
227430
4000
๋ฏธ์„ฑ์ˆ™ ์žฅ์–ด๋Š” ์ž…์— ๋“ค์–ด๊ฐ€๋Š” ๊ฑด ๋‹ฅ์น˜๋Š” ๋Œ€๋กœ ๋จน์–ด์น˜์›๋‹ˆ๋‹ค.
03:51
These omnivores grow in proportion to their diets,
54
231430
3600
์ด๋•Œ ์žฅ์–ด๋Š” ์žก์‹์„ฑ์œผ๋กœ ์ž๋ผ๊ฒŒ ๋˜์ฃ .
03:55
and over the next decade they develop into larger yellow eels.
55
235030
4833
์ด๋ ‡๊ฒŒ 10๋…„์— ๊ฑธ์ณ ์ปค๋‹ค๋ž€ ํ™ฉ๋ฑ€์žฅ์–ด๋กœ ์„ฑ์žฅํ•ฉ๋‹ˆ๋‹ค.
03:59
In this stage, they grow to be roughly 80 cm,
56
239863
4525
์ด ๋‹จ๊ณ„์— ์–ด๋ฆผ์žก์•„ 80cm์˜ ํฌ๊ธฐ๊ฐ€ ๋ฉ๋‹ˆ๋‹ค.
04:04
and finally develop sexual organs.
57
244388
3510
๋“œ๋””์–ด ์ƒ์‹๊ธฐ๊ฐ€ ๋ฐœ๋‹ฌํ•˜๋Š” ์‹œ๊ธฐ์ž…๋‹ˆ๋‹ค.
04:07
But the last phase of eel lifeโ€” and the secret of their reproductionโ€”
58
247898
5583
ํ•˜์ง€๋งŒ ์ด ๋งˆ์ง€๋ง‰ ๋‹จ๊ณ„์—์„œ
์žฅ์–ด์˜ ๋ฒˆ์‹์— ๊ด€ํ•œ ๋น„๋ฐ€์€ ์•„์ง๋„ ๋ฒ ์ผ์— ์Œ“์—ฌ์žˆ์Šต๋‹ˆ๋‹ค.
04:13
remains mysterious.
59
253481
2220
04:15
In 1896, researchers identified leptocepheli as larval eels,
60
255701
6149
1896๋…„, ์—ฐ๊ตฌ์ž๋“ค์€ ๋Œ“์žŽ์žฅ์–ด๊ฐ€ ์žฅ์–ด์˜ ์ƒˆ๋ผ๋ผ๋Š” ๊ฒƒ์„ ์•Œ์•„๋ƒ…๋‹ˆ๋‹ค.
04:21
and deduced that they had come to Europe from somewhere in the Atlantic.
61
261850
4239
๊ทธ๊ฒƒ๋“ค์ด ๋Œ€์„œ์–‘ ์–ด๋”˜๊ฐ€์—์„œ ์˜จ ๊ฒƒ์ด๋ผ ์ƒ๊ฐํ–ˆ์ฃ .
04:26
However, to find this mysterious breeding ground,
62
266089
3150
ํ•˜์ง€๋งŒ ๋ฒ ์ผ์— ์Œ“์ธ ์žฅ์–ด์˜ ๋ฒˆ์‹์ง€๋ฅผ ์ฐพ๊ธฐ ์œ„ํ•ด
04:29
someone would have to perform an unthinkable survey of the ocean
63
269239
3600
๋ˆ„๊ตฐ๊ฐ€๋Š” ์ƒ์ƒ๋„ ๋ชปํ•  ํ•ด์–‘ ์กฐ์‚ฌ๋ฅผ ํ•ด์•ผ ํ–ˆ์Šต๋‹ˆ๋‹ค.
04:32
for larvae no larger than 30mm.
64
272839
3920
์™œ๋ƒํ•˜๋ฉด ์žฅ์–ด์˜ ํฌ๊ธฐ๋Š” 30mm ๋ณด๋‹ค ์ž‘๊ธฐ ๋•Œ๋ฌธ์ด์ฃ .
04:36
Enter Johannes Schmidt.
65
276759
2336
์š”ํ•˜๋„ค์Šค ์Šˆ๋ฏธํŠธ๊ฐ€ ๋ฐ”๋กœ ๊ทธ ์—ฐ๊ตฌ๋ฅผ ์‹œ์ž‘ํ–ˆ์Šต๋‹ˆ๋‹ค.
04:39
For the next 18 years, this Danish oceanographer
66
279095
3604
๊ทธ ํ›„ 18๋…„ ๋™์•ˆ
์ด ๋ด๋งˆํฌ ํ•ด์–‘ํ•™์ž๋Š” ์‚ฌ๋Œ€๋ฅ™์˜ ํ•ด์•ˆ์„ ์ƒ…์ƒ…์ด ํ›‘์—ˆ์Šต๋‹ˆ๋‹ค.
04:42
trawled the coasts of four continents,
67
282699
2640
04:45
hunting down increasingly tiny leptocepheli.
68
285339
3930
๋” ์ž‘์€ ํฌ๊ธฐ์˜ ๋Œ“์žŽ์žฅ์–ด๋ฅผ ์žก์œผ๋ฉฐ ์ถ”์ ํ•ด๊ฐ”์ฃ .
04:49
Finally, in 1921, he found the smallest larvae yet,
69
289269
4501
1921๋…„, ๋งˆ์นจ๋‚ด ๋‹น์‹œ์— ๊ฐ€์žฅ ์ž‘์€ ๋Œ“์žŽ์žฅ์–ด๋ฅผ ๋ฐœ๊ฒฌํ•ฉ๋‹ˆ๋‹ค.
04:53
on the southern edge of the Sargasso Sea.
70
293770
4240
์‚ฌ๋ฅด๊ฐ€์†Œ ํ•ด์˜ ๋‚จ์ธก ๋๋‹จ์—์„œ์š”.
04:58
Despite knowledge of their round trip migration,
71
298010
2940
์žฅ์–ด๊ฐ€ ์™•๋ณต ์ด๋™์„ ํ•œ๋‹ค๋Š” ๊ฒƒ์„ ์•Œ๊ณ  ์žˆ์Œ์—๋„ ๋ถˆ๊ตฌํ•˜๊ณ 
05:00
scientists still havenโ€™t observed mating in the wild,
72
300950
3390
์—ฌ์ „ํžˆ ๊ณผํ•™์ž๋“ค์€ ์žฅ์–ด๋“ค์˜ ์ง์ง๊ธฐ๋ฅผ ๋ณธ ์ ์ด ์—†์—ˆ๊ณ 
05:04
or found a single eel egg.
73
304340
2553
์žฅ์–ด์˜ ์•Œ ํ•˜๋‚˜๋„ ์ฐพ์„ ์ˆ˜ ์—†์—ˆ์Šต๋‹ˆ๋‹ค.
05:06
Leading theories suggest that eels reproduce
74
306893
2950
์žฅ์–ด์˜ ๋ฒˆ์‹ ๋ฐฉ๋ฒ•์— ๊ด€ํ•œ ๊ฐ€์žฅ ์œ ๋ ฅํ•œ ๊ฐ€์„ค๋กœ๋Š”
05:09
in a flurry of external fertilization,
75
309843
3070
์ฒด์™ธ ์ˆ˜์ •์ด ํ•œ์ฐฝ์ผ ๋•Œ
05:12
in which clouds of sperm fertilize free-floating eggs.
76
312913
4455
๋งˆ์น˜ ๊ตฌ๋ฆ„ ๊ฐ™์€ ์ •์ž์™€ ๋– ๋‹ค๋‹ˆ๋Š” ๋‚œ์ž๊ฐ€ ๋งŒ๋‚˜ ์ˆ˜์ •ํ•ฉ๋‹ˆ๋‹ค.
05:17
But the powerful currents and tangling seaweed of the Sargasso Sea
77
317368
4220
ํ•˜์ง€๋งŒ ์‚ฌ๋ฅด๊ฐ€์†Œ ๋ฐ”๋‹ค์˜ ๊ฐ•๋ ฅํ•œ ๋ฌผ์‚ด๊ณผ ํ•ด์ดˆ์— ์—‰ํ‚ฌ ์ˆ˜ ์žˆ๊ธฐ ๋•Œ๋ฌธ์—
05:21
have made this theory difficult to confirm.
78
321588
3210
์ด ๊ฐ€์„ค์€ ์ž…์ฆ๋˜๊ธฐ ์–ด๋ ต์Šต๋‹ˆ๋‹ค.
05:24
Researchers donโ€™t even know where to look,
79
324798
2670
์—ฐ๊ตฌ์ž๋“ค์€ ์–ด๋””๋ฅผ ์ฐพ์•„๋ด์•ผ ํ• ์ง€ ๋ชจ๋ฆ…๋‹ˆ๋‹ค.
05:27
since theyโ€™ve yet to successfully track an eel
80
327468
2450
๋ชจ๋“  ๊ณผ์ •์„ ๋๋‚ด๊ณ  ๋Œ์•„์˜ค๋Š”
05:29
over the course of its return migration.
81
329918
2670
์žฅ์–ด์˜ ์ถ”์ ์„ ์‹คํŒจํ•œ ์ดํ›„๋กœ์š”.
05:32
Until these challenges can be met,
82
332588
2410
์—ฐ๊ตฌ์ž๋“ค์˜ ๋„์ „์ด ์„ฑ๊ณตํ•  ๋•Œ๊นŒ์ง€
05:34
the eelโ€™s ancient secret will continue to slip through our fingers.
83
334998
5504
์žฅ์–ด ์กฐ์ƒ์˜ ๋น„๋ฐ€์€ ๊ณ„์†ํ•ด์„œ ์šฐ๋ฆฌ์˜ ์†์—์„œ ๋ฏธ๋„๋Ÿฌ์ ธ ๋‚˜๊ฐˆ ๊ฒƒ์ž…๋‹ˆ๋‹ค.
์ด ์›น์‚ฌ์ดํŠธ ์ •๋ณด

์ด ์‚ฌ์ดํŠธ๋Š” ์˜์–ด ํ•™์Šต์— ์œ ์šฉํ•œ YouTube ๋™์˜์ƒ์„ ์†Œ๊ฐœํ•ฉ๋‹ˆ๋‹ค. ์ „ ์„ธ๊ณ„ ์ตœ๊ณ ์˜ ์„ ์ƒ๋‹˜๋“ค์ด ๊ฐ€๋ฅด์น˜๋Š” ์˜์–ด ์ˆ˜์—…์„ ๋ณด๊ฒŒ ๋  ๊ฒƒ์ž…๋‹ˆ๋‹ค. ๊ฐ ๋™์˜์ƒ ํŽ˜์ด์ง€์— ํ‘œ์‹œ๋˜๋Š” ์˜์–ด ์ž๋ง‰์„ ๋”๋ธ” ํด๋ฆญํ•˜๋ฉด ๊ทธ๊ณณ์—์„œ ๋™์˜์ƒ์ด ์žฌ์ƒ๋ฉ๋‹ˆ๋‹ค. ๋น„๋””์˜ค ์žฌ์ƒ์— ๋งž์ถฐ ์ž๋ง‰์ด ์Šคํฌ๋กค๋ฉ๋‹ˆ๋‹ค. ์˜๊ฒฌ์ด๋‚˜ ์š”์ฒญ์ด ์žˆ๋Š” ๊ฒฝ์šฐ ์ด ๋ฌธ์˜ ์–‘์‹์„ ์‚ฌ์šฉํ•˜์—ฌ ๋ฌธ์˜ํ•˜์‹ญ์‹œ์˜ค.

https://forms.gle/WvT1wiN1qDtmnspy7