The Fish Basin and Wood Stack are inextricably linked. You need as much fish as you can hold to upgrade your wood and vice-versa. You'll also have to have max Vikings for your Meade Hall level and you always need to upgrade your basins before upgrading your Academy.
The Fish Basin is one of the main resources storage buildings in the game.
The bigger your Fish Basin is the more 
you get in Toothless' bags from Special Events.
Building Progression (Fish Basin One)[]
| Level | Storage Capacity | Upgrade to Next Level | ||
|---|---|---|---|---|
| Vikings Required |  /
|
| ||
| 1 | 400
|
2 | 250
|
2m30s |
| 2 | 700
|
5 | 550
|
5m |
| 3 | 1,500
|
10 | 1,400
|
15m |
| 4 | 4,000
|
15 | 3,850
|
25m |
| 5 | 8,000
|
20 | 7,850
|
45m |
| 6 | 15,000
|
23 | 14,000
|
2h |
| 7 | 50,000
|
35 | 49,000
|
2h40m |
| 8 | 100,000
|
55 | 97,000
|
3h20m |
| 9 | 200,000
|
75 | 193,000
|
4h10m |
| 10 | 320,000
|
85 | 310,000
|
6h30m |
| 11 | 575,000
|
135 | 565,000
|
10h |
| 12 | 1,000,000
|
164 | 950,000
|
14h20m |
| 13 | 2,000,000
|
300 | 1,950,000
|
18h20m |
| 14 | 3,000,000
|
425 | 2,600,000
|
1d14h |
| 15 | 10,000,000
|
560 | 9,800,000
|
2d08h |
| 16 | 30,000,000
|
1,010 | 28,500,000
|
3d |
| 17 | 60,000,000
|
1,280 | 58,500,000
|
3d12h |
| 18 | 80,000,000
|
1,525 | 78,500,000
|
4d |
| 19 | 250,000,000
|
1,800 | 245,000,000
|
4d12h |
| 20 | 500,000,000
|
2,990 | 90 
|
6d |
| 21 | 750,000,000
|
7,250 | 9,800
|
6d |
| 22 | 1,000,000,000
|
None | None | None |
Building Progression (Fish Basin Two)[]
| Level | Storage Capacity | Upgrade to Next Level | ||
|---|---|---|---|---|
| Vikings Required | /
|
| ||
| 0 | 0 | 8,400 | 14,000
|
6d |
| 1 | 1,500,000,000
|
9,000 | 17,000
|
6d |
| 2 | 2,000,000,000
|
9,300 | 29,000
|
6d |
| 3 | 2,250,000,000
|
10,250 | 35,000
|
6d |
| 4 | 2,750,000,000
|
10,900 | 45,000
|
6d |
| 5 | 3,000,000,000
|
None | None | None |
Building Design[]
| Fish Basin Lv. 1 | Fish Basin Lv. 2 | Fish Basin Lv. 3 | ||
| Fish Basin Lv. 4 | Fish Basin Lv. 5 | Fish Basin Lv. 6 | ||
| Fish Basin Lv. 7 | Fish Basin Lv. 8 | Fish Basin Lv. 9 | ||
| Fish Basin Lv. 10 | Fish Basin Lv. 11 | Fish Basin Lv. 12 | ||
| Fish Basin Lv. 13 | Fish Basin Lv. 14 | Fish Basin Lv. 15 | ||
| Fish Basin Lv. 16 | Fish Basin Lv. 17 | Fish Basin Lv. 18 | ||
| Fish Basin Lv. 19 | Fish Basin Lv. 20 | Fish Basin Lv. 21 | ||
| Fish Basin Lv. 22 | ||||
| Fish Basin Two Lv. 0 | Fish Basin Two Lv. 1 | Fish Basin Two Lv. 2 | ||
| Fish Basin Two Lv. 3 | Fish Basin Two Lv. 4 |
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