Comparing commercial seaweed production volumes by genus...
About 70% of world seaweed production is accounted for by Lithothamnion spp. (a.k.a. marl; as wet weight ) and Laminaria spp. (a.k.a. kelp, kombu or hai dai; as dry weight). The "top ten" genera comprise more than 95% of world production. About half of the over 2 M tons/yr produced is from cultivation. Laminaria spp. accounts for over 60% of the total while Porphyra, Kappaphycus, Eucheuma, Undaria and Gracilaria make up most of the rest to a total of 99%.
Total metric tons/yr of seaweed production
(Lithothamnion as wet weight; other genera as commercially dry)
Rank Genus Type Total % total % cumulated
  World   2,165,675    
1 Lithothamnion red 801,000 * 37 37
2 Laminaria brown 731,477 34 71
3 Porphyra red 130,622 6 77
4 Undaria brown 121,714 6 82
5 Kappaphycus red 105,200 5 87
6 Gracilaria red 87,449 4 91
7 Ascophyllum brown 31,011 1 93
8 Eucheuma red 28,746 1 94
9 Macrocystis brown 26,065 1 95
10 Lessonia brown 24,754 1 96
11 Gelidium red 18,773 1 97
12 Chondrus red 12,213 1 98
13 Sargassum brown 7,649 0 98
14 Hizikia brown 7,500 0 99
15 Gigartina red 6,411 0 99
16 Iridaea red 5,606 0 99
17 Ahnfeltia red 5000 0 99
18 Durvillaea brown 4,464 0 100
19 Enteromorpha green 2,438 0 100
20 Cladosiphon brown 1,500 0 100
21 Ulva green 1,500 0 100
22 Monostroma green 1,250 0 100
23 Caulerpa green 810 0 100
24 Mastocarpus red 675 0 100
25 Pterocladia red 350 0 100
26 Ecklonia brown 350 0 100
27 Turbinaria brown 307 0 100
28 Gelidiella red 232 0 100
29 Gloiopeltis red 200 0 100
30 Palmaria red 103 0 100
31 Codium green 100 0 100
32 Furcellaria red 100 0 100
33 Fucus brown 84 0 100
34 Nereocystis brown 22 0 100
Metric tons/yr of cultivated seaweed 
(as commercially
dry weight)
Genus Type Cultivated % total % cumulated
World   1,100,199    
Laminaria brown 673,064 61 61
Porphyra red 130,614 12 73
Kappaphycus red 105,200 10 82
Undaria brown 101,708 9 92
Gracilaria red 49,065 4 96
Eucheuma red 28,247 3 99
Hizikia brown 6,300 1 99
Enteromorpha green 2,438 0 99
Cladosiphon brown 1,500 0 100
Monostroma green 1,250 0 100
Caulerpa green 810 0 100
Chondrus red 1 0 100
Gelidiella red 1 0 100
Gelidium red 1 0 100

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