University, Subject, Country, Region, World
Japan 137 Scientists Subject Rankings - 2025
The AD Scientific Index (Alper-Doger Scientific Index) provides the most comprehensive analysis across 13 main fields and 197 sub-branches at global, national, and regional levels. These analyses are based on indicators such as the H-index, i10-index, and citation count, including their values from the last 6 years. As of Feb 16, 2025, the rankings are determined according to the Total H Index. BETA VERSION: The subject field rankings for the world, regions, countries, and universities are currently in their Beta phase. This is due to the exclusion of (888.752) scientists categorized under ‘Others’, whose profiles have yet to be determined, edited, or classified. As updates are made to these fields, the rankings will be adjusted accordingly. Note: Please keep this in mind while reviewing the rankings. For further details, explore our [University Subject Rankings].
* Total H IndexRankings
Ranking Based On Selection: 1
fish and shellfish immunology
fish and shellfish genomics
fish and shellfish infectious diseases
Metrics
H-Index
i10 Index
Citation Counts
79
341
20,534
* Total H IndexRankings
Ranking Based On Selection: 2
natural product chemistry
Metrics
H-Index
i10 Index
Citation Counts
74
258
19,592
* Total H IndexRankings
Ranking Based On Selection: 3
aquatic ecology
plant science
environmental science
Metrics
H-Index
i10 Index
Citation Counts
54
196
10,654
* Total H IndexRankings
Ranking Based On Selection: 4
Aquatic Biology
Aquaculture
Metrics
H-Index
i10 Index
Citation Counts
49
183
8,060
* Total H IndexRankings
Ranking Based On Selection: 5
aquatic microbial ecology
antibiotic resistance
marine microbiology
fish disease
Metrics
H-Index
i10 Index
Citation Counts
48
143
9,781
* Total H IndexRankings
Ranking Based On Selection: 6
Fisheries
Seed Production
Reproductive Physiology
Metrics
H-Index
i10 Index
Citation Counts
47
147
8,147
* Total H IndexRankings
Ranking Based On Selection: 7
food microbiology
Metrics
H-Index
i10 Index
Citation Counts
46
150
6,670
* Total H IndexRankings
Ranking Based On Selection: 8
Aquacuture
Marine microbiology
Metrics
H-Index
i10 Index
Citation Counts
44
112
8,543
* Total H IndexRankings
Ranking Based On Selection: 9
marine ecosystem
biogeochemistry
plankton
ecosystem services
fisheries oceanography
Metrics
H-Index
i10 Index
Citation Counts
44
108
7,293
* Total H IndexRankings
Ranking Based On Selection: 10
reproductive physiology
Fish Physiology
insects_as_food_and_feed
sustainable aquaculture
Metrics
H-Index
i10 Index
Citation Counts
43
91
8,512
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* Total H IndexRankings
Ranking Based On Selection: 11
Marine Ecology
Metrics
H-Index
i10 Index
Citation Counts
42
124
6,425
* Total H IndexRankings
Ranking Based On Selection: 12
Marine Biogeochemistry
Fisheries Oceanography
Metrics
H-Index
i10 Index
Citation Counts
42
93
9,736
* Total H IndexRankings
Ranking Based On Selection: 13
fisheries science
algae
biochemistry
isoprenoid
natural products chemistry
Metrics
H-Index
i10 Index
Citation Counts
42
103
4,933
* Total H IndexRankings
Ranking Based On Selection: 14
metabarcoding
metagenomics
whole genome analysis
Metrics
H-Index
i10 Index
Citation Counts
40
151
6,368
* Total H IndexRankings
Ranking Based On Selection: 15
Fishery
Metrics
H-Index
i10 Index
Citation Counts
40
99
5,556
* Total H IndexRankings
Ranking Based On Selection: 16
aquaphotomics
near infrared spectroscopy
bio measurement
chemometrics
Metrics
H-Index
i10 Index
Citation Counts
38
91
5,277
* Total H IndexRankings
Ranking Based On Selection: 17
Fish biology
Aquaculture
Larviculture
Metrics
H-Index
i10 Index
Citation Counts
38
89
3,845
* Total H IndexRankings
Ranking Based On Selection: 18
Metrics
H-Index
i10 Index
Citation Counts
37
84
4,719
* Total H IndexRankings
Ranking Based On Selection: 19
Fisheries Science
Wise-use of fish by-products
collagen
Metrics
H-Index
i10 Index
Citation Counts
37
72
3,739
* Total H IndexRankings
Ranking Based On Selection: 20
Marine Biology
Morphology
Biodiversity
Metrics
H-Index
i10 Index
Citation Counts
37
131
4,399
* Total H IndexRankings
Ranking Based On Selection: 21
ichthyology
fisheries
molecular phylogeny
aquatic biology
freshwater fish
Metrics
H-Index
i10 Index
Citation Counts
36
68
6,021
* Total H IndexRankings
Ranking Based On Selection: 22
Computation Mechanics
Structural Mechanics
Fracture Mechanics
Marine Structures
Metrics
H-Index
i10 Index
Citation Counts
35
66
3,264
* Total H IndexRankings
Ranking Based On Selection: 23
Fisheries science
Fishing gear technology
Fisheries management
Fisheries Biology
Metrics
H-Index
i10 Index
Citation Counts
35
82
4,857
* Total H IndexRankings
Ranking Based On Selection: 24
Fish physiology
Metrics
H-Index
i10 Index
Citation Counts
35
62
4,268
* Total H IndexRankings
Ranking Based On Selection: 25
marine natural products
Metrics
H-Index
i10 Index
Citation Counts
34
64
3,826
Ikuo Hirono
Metrics
H-Index
i10-Index
Citation Counts
79
341
20,534
fish and shellfish immunology
fish and shellfish genomics
fish and shellfish infectious diseases
Shigeki Matsunaga
University of Tokyo
Tokyo, Japan
Metrics
H-Index
i10-Index
Citation Counts
74
258
19,592
Takashi Asaeda
Saitama University
Saitama, Japan
Metrics
H-Index
i10-Index
Citation Counts
54
196
10,654
aquatic ecology
plant science
environmental science
Atsushi Hagiwara
Nagasaki University
Nagasaki, Japan
Metrics
H-Index
i10-Index
Citation Counts
49
183
8,060
Satoru Suzuki
Ehime University
Matsuyama, Japan
Metrics
H-Index
i10-Index
Citation Counts
48
143
9,781
aquatic microbial ecology
antibiotic resistance
marine microbiology
fish disease
Fisheries
Seed Production
Reproductive Physiology
Bon Kimura
Metrics
H-Index
i10-Index
Citation Counts
46
150
6,670
Hiroaki Saito
University of Tokyo
Tokyo, Japan
Metrics
H-Index
i10-Index
Citation Counts
44
108
7,293
marine ecosystem
biogeochemistry
plankton
ecosystem services
fisheries oceanography
Miura Takeshi
Ehime University
Matsuyama, Japan
Metrics
H-Index
i10-Index
Citation Counts
43
91
8,512
reproductive physiology
Fish Physiology
insects_as_food_and_feed
sustainable aquaculture
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Masahiro Nakaoka
Hokkaido University
Sapporo, Japan
Metrics
H-Index
i10-Index
Citation Counts
42
124
6,425
Shigenobu Takeda
Nagasaki University
Nagasaki, Japan
Metrics
H-Index
i10-Index
Citation Counts
42
93
9,736
Marine Biogeochemistry
Fisheries Oceanography
Shigeru Okada
University of Tokyo
Tokyo, Japan
Metrics
H-Index
i10-Index
Citation Counts
42
103
4,933
fisheries science
algae
biochemistry
isoprenoid
natural products chemistry
Satoshi Nagai
Metrics
H-Index
i10-Index
Citation Counts
40
151
6,368
metabarcoding
metagenomics
whole genome analysis
Seinen Chow
Metrics
H-Index
i10-Index
Citation Counts
40
99
5,556
aquaphotomics
near infrared spectroscopy
bio measurement
chemometrics
Yoshitaka Sakakura
Nagasaki University
Nagasaki, Japan
Metrics
H-Index
i10-Index
Citation Counts
38
89
3,845
Fish biology
Aquaculture
Larviculture
Yoshioki Oozeki
Metrics
H-Index
i10-Index
Citation Counts
37
84
4,719
Takagi Yasuaki
Hokkaido University
Sapporo, Japan
Metrics
H-Index
i10-Index
Citation Counts
37
72
3,739
Fisheries Science
Wise-use of fish by-products
collagen
Euichi Hirose
University of Ryukyus
Sendai, Japan
Metrics
H-Index
i10-Index
Citation Counts
37
131
4,399
Marine Biology
Morphology
Biodiversity
Kenji Saitoh
Metrics
H-Index
i10-Index
Citation Counts
36
68
6,021
ichthyology
fisheries
molecular phylogeny
aquatic biology
freshwater fish
Satoyuki Tanaka
Hiroshima University
Higashihiroshima, Japan
Metrics
H-Index
i10-Index
Citation Counts
35
66
3,264
Computation Mechanics
Structural Mechanics
Fracture Mechanics
Marine Structures
Tadashi Tokai
Metrics
H-Index
i10-Index
Citation Counts
35
82
4,857
Fisheries science
Fishing gear technology
Fisheries management
Fisheries Biology
Hiroaki Suetake
Fukui Prefectural University
Eiheiji, Japan
Metrics
H-Index
i10-Index
Citation Counts
35
62
4,268
Keiichi Konoki
Tohoku University
Sendai, Japan
Metrics
H-Index
i10-Index
Citation Counts
34
64
3,826