| IBM compatible |
| ice fishing |
| Icefishes or noodlefishes |
| Iceland Museum of Natural History, Iceland |
| ichnotaxon |
| ichthidin |
| ichthin |
| ichthulin |
| ichthyism |
| ichthyismus |
| ichthylepiden |
| ichthyoacanthotoxin |
| ichthyoacanthotoxism |
| ichthyoallyeinotoxism |
| ichthyocide |
| ichthyocol |
| ichthyocoprolite |
| ichthyocrinotoxic fishes |
| ichthyocrinotoxin |
| ichthyofauna |
| ichthyohemotoxic fishes |
| ichthyohemotoxin |
| ichthyohemotoxism |
| ichthyohepatotoxic fishes |
| ichthyohepatotoxin |
| ichthyohepatotoxism |
| ichthyoid |
| ichthyolatry |
| ichthyolite |
| ichthyology |
| ichthyomorphic |
| ichthyoneuston |
| ichthyootoxic fishes |
| ichthyootoxin |
| ichthyootoxism |
| ichthyophagous |
| ichthyoplankton |
| ichthyopterygium |
| ichthyosarcotoxic fishes |
| ichthyosarcotoxin |
| ichthyosarcotoxism |
| ichthyosis |
| ichthyotoxicology |
| ichthyotoxin |
| ICLARM |
| iconotype |
| identification |
| identification key |
| IGFA |
| ikijime |
| Ikra |
| Ikura |
| illicium |
| Illinois Natural History Survey, Chicago |
| imago |
| imbricated |
| immigration |
| impounding net |
| imprinting |
| in situ |
| in-situ |
| in-situ conservation |
| in-situ production |
| inactive reproductive state |
| inappropriate name |
| inarticulate |
| inbreeding |
| incertae sedis |
| incidental catch |
| incipient |
| incipient fin ray |
| incised |
| incised membrane |
| incisiform |
| incisor |
| incisure |
| inclusive fitness |
| incomplete reef top |
| increment |
| incubation |
| incubation period |
| incubator |
| incurrent apertures |
| indented |
| independent dentition |
| indeterminate |
| indeterminate fecundity |
| index |
| Index of Biotic Integrity |
| Indian ilisha |
| Indian Ocean |
| Indian oil sardine |
| Indiana State University, Department of Life Sciences, Indiana |
| indication |
| Indicator |
| indicator species |
| indigenous |
| indigenous knowledge |
| indigenous people |
| individual quota |
| individual selection |
| individual transferable quota |
| individually poly bagged |
| individually quick frozen |
| Indo-Australian Archipelago |
| Indo-Pacific |
| Indo-West Pacific |
| induced breeding |
| induced spawning |
| industrial fish |
| industrial fishery |
| infaunal |
| inferior |
| infestation |
| inflatable |
| information |
| information system |
| infra |
| infrageneric |
| infraorbital |
| infraorbital canal |
| Infrapharyngeal bones |
| infraspecies |
| infraspecific name |
| infrasubspecific |
| infrasubspecific name |
| infrasubspecific taxon |
| ingroup |
| initial phase |
| initial-phase |
| inland water |
| inlet |
| INM |
| innate |
| inner corner |
| inner ear |
| inner margin |
| Inner Seas off the West Coast of Scotland |
| input controls |
| inquiline |
| Insecta |
| insecticide |
| insertion |
| insertion and copulation |
| insertion of fins |
| inshore fishery |
| inshore plain |
| inshore waters |
| instantaneous rates |
| instinct |
| Institut Royal des Sciences Naturelles de Belgique, Brussels |
| Institut zoologii PAN, Warszawa, Poland |
| Institute für Seefischerei, Hamburg |
| Institute of Biological Sciences, University of Tsukuba |
| Institute of Oceanic Research and Development |
| Institute of Zoology, Academia Sinica, Taipei |
| institutions |
| Instituto de Ciencias del Mar |
| Instituto de Ciencias del Mar, Barcelona |
| Instituto de Limnología "Dr. Raúl A. Ringuelet" |
| Instituto Nacional de Pesquisas da Amazonia |
| insular |
| Integrated coastal zone management |
| integrated fish farming |
| integument |
| intensive culture |
| inter |
| inter-islet channel |
| inter-radial membrane |
| interbreeding |
| intercuale |
| interdorsal |
| interdorsal ridge |
| interface |
| interhaemal bones |
| interleaved |
| intermittent |
| intermuscular bones |
| internal bearer |
| internal fertilisation |
| internarial |
| internarial space |
| internasal |
| internasal flap |
| internasal valve |
| International Game Fish association |
| Internet |
| interneural bones |
| interoparity |
| interopercle |
| interorbital |
| interorbital distance |
| interorbital space |
| interpelvic space |
| interpolated name |
| interradial |
| interradial membrane |
| interrenal gland |
| interspace |
| interspecific |
| interspinous membrane |
| intersticine |
| interstitial |
| intertidal |
| intertidal lagoon with intertidal connection |
| intestine |
| intrageneric |
| intraspecific |
| intraspecific genetic variation |
| intrinsic |
| intrinsic growth rate |
| intrinsic rate of increase |
| intrinsic value |
| Introduced |
| introduced species |
| introgression |
| intromittent fertilisation |
| invalid |
| invalid name |
| invalid nomenclatural act |
| invasive species |
| inventory |
| inversion |
| invertebrates |
| invertivore |
| iodoform odour |
| Ionian Sea |
| ionic regulation |
| Iowa State University , Ames |
| ipsilateral |
| iridescent |
| iridocyte |
| iris |
| Irish Sea and St. George's Channel |
| Irish trawl |
| irodocytes |
| irradiation |
| Isaac-Kidd-midwater trawl |
| isallotherm |
| Isinglass |
| Island biogeography |
| isobath |
| isobatic |
| isobenth |
| isocercal |
| isocheim |
| isodont |
| isoenzyme |
| isoflor |
| isohydric |
| isohyet |
| isolating mechanism |
| isolecithal |
| isonome |
| isopiptesis |
| isopod |
| isopropyl |
| isopropyl alcohol |
| isosmotic |
| isospondylous |
| isotach |
| isotherm |
| isotonic |
| isozoic |
| isozyme |
| ISSCAAP |
| isthmus |
| IT |
| Italian |
| Italian sardel |
| iteroparity |
| iteroparous |
| IUCN |
| Izu Oceanic Park |
