| T-net |
| t0 |
| table |
| tableknoll |
| tablemount |
| tackle |
| tactile |
| taeniform |
| tag loss |
| tagging |
| tagging mortality |
| tagging-recapture |
| tail |
| tail fin |
| tail tuck |
| tail walking |
| tail-bud stage |
| tail-free stage |
| tailing |
| tailrace |
| tailwater |
| taint |
| Taiwan Fisheries Research Institute, Chilung, Taiwan |
| Taiwan Fisheries Research Institute, Taitung, Taiwan |
| tambak |
| tandem selection |
| tangle net |
| Tangs |
| tank |
| tapetum lucidum |
| tapeworms |
| taphonomy |
| tapwater |
| Tarama |
| target species |
| tarn |
| Tarpons |
| Tasman Sea |
| Tasmanian Fisheries Development Authority |
| tassel |
| Tatami-iwashi |
| tautology |
| tautonym |
| tautonymy |
| taxis |
| taxocene |
| taxon |
| taxonomic |
| taxonomic group |
| taxonomic hierarchy |
| taxonomic taxon |
| taxonomy |
| teardrop |
| teat |
| tectal |
| TED |
| teeth |
| tele- |
| telencephalon |
| teleosts |
| teleplanic |
| Telescopefishes |
| telescopic eye |
| telmatophilous |
| telmicolous |
| telocentric |
| telolecithal |
| telolecithal eggs |
| telson |
| temperate |
| Temperate basses |
| Temperate ocean-basses |
| temperate region |
| temperature |
| temporal |
| temporal closure |
| temporary specializations for pelagic life |
| tenaculum |
| tenderometer |
| tendon |
| tendril |
| Tenericutes |
| Tenpounders |
| tentacle |
| tentaculum |
| tentering |
| tenuis stage |
| teratogen |
| teratological |
| teratological specimen |
| terete |
| term size |
| terminal |
| terminal 3 cartilage |
| terminal fisheries |
| terminal lake |
| terminal lobe |
| terminal male |
| terminal margin |
| terminal mouth |
| terminal-phase male |
| termination |
| terminus |
| ternary name |
| terrace |
| territorial |
| territorial behaviour |
| territorial waters |
| territoriality |
| territory |
| tertiary |
| tertiary production |
| tessellated |
| tesserae |
| teste |
| testes |
| testis |
| tetra- |
| tetraodon poisoning |
| tetraodontoxin |
| tetraploid |
| tetrodotoxic fishes |
| tetrodotoxication |
| tetrodotoxin |
| Texas A & M University Texas Cooperative Wildlife Collection, Texas |
| Texas Memorial Museum, University of Texas, Austin |
| Texas Tech. University, Lubbock, Texas |
| thalassic |
| thalassophilous |
| thalassoplankton |
| thalweg |
| thaw drip |
| The Charleston Museum, Charleston, South Carolina |
| The Coastal Waters of Southeast Alaska and British Columbia |
| The Natural History Museum |
| thelytokous |
| therm- |
| thermal layer |
| thermal refugium |
| thermal spring |
| thermo- |
| thermocline |
| thermohaline |
| thermopegic |
| thermophilic |
| thermophobic |
| thickler chain |
| thigmotropic |
| thimble |
| thinning |
| Thirds |
| tholichthys stage |
| thoracic |
| thorn |
| Thornbacks |
| Thornfishes |
| thornlet |
| Thorny catfishes |
| Threadfin breams |
| Threadfins |
| threat |
| threatened |
| threatened species |
| Three-toothed puffer |
| Threefin blennies |
| Thresher sharks |
| threshold |
| throat |
| throat teeth |
| throw net |
| Thunfischwürstchen |
| thunniform swimming |
| thymus |
| thyroid gland |
| tidal flat |
| tidal marsh |
| tidal stream transport |
| tide |
| tide pool |
| Tigerperches |
| Tight pack |
| tilapia |
| Tilefishes |
| Timor Sea |
| Tinabal |
| Tinapa |
| tip |
| tip length |
| tiphic |
| tiphicolous |
| tiphiphilous |
| tippet |
| tire reef |
| Tjakalang |
| Toadfishes |
| Tokan-hin |
| Tokyo University of Fisheries, Ichthyological Laboratory, Tokyo |
| ton |
| tongue |
| Tonguefishes |
| tonne |
| Tonno |
| tooth plate |
| tooth rows |
| toponym |
| topotype |
| topotypical population |
| torching |
| torpedoform |
| Torrent catfishes |
| torso thrust (with clasper flexion) |
| total allowable catch |
| total fecundity |
| total length |
| total mortality |
| total productivity |
| towed net |
| toxactinium |
| toxic |
| toxin |
| trabecula |
| trabecular |
| tracing predator |
| tracking predator |
| tradable permit |
| trade winds |
| trade-off |
| traditional Chinese medicine |
| traditional classification |
| tragedy of the commons |
| Trahiras |
| trailing |
| trailing edge |
| trait |
| tram oil |
| trammel net |
| Tran oil |
| trans- |
| transboundary stock |
| transducer |
| transferred species |
| transformation |
| transformation in fish larvae |
| transformation stage |
| transhipping |
| transition |
| transition zone |
| transliterate |
| transliteration |
| translocation |
| translucent object |
| translucent zone |
| transnational fishery |
| transparent object |
| transplanted species |
| transshipment |
| transverse |
| transverse curtain |
| transverse groove |
| transverse ridges |
| transverse scale row |
| trap and haul program |
| trap fishing |
| trap net |
| trash collector |
| trash fish |
| traumatogenic |
| trawl |
| trawl winch |
| trawler |
| treatment of poisoning of venomous fishes |
| tree |
| Trematoda |
| trematode |
| trench |
| trenchant |
| Trepang |
| tri- |
| triaclyglycerol |
| triassic |
| tribasal pectoral fin |
| tribe |
| tricuspid |
| tricuspid tooth |
| trifid |
| trifurcate |
| Triggerfishes |
| trihedral |
| trilobate lower lip |
| trim net |
| trimethylamine oxide |
| trimming |
| trimmings |
| trinomen |
| Triplespines |
| Tripletails |
| triploid |
| tripus |
| triradiate |
| tritor |
| tritors |
| trituration |
| trivial name |
| troglobite |
| troglobitic |
| troglomorphic |
| troglophile |
| troll fishery |
| trolling |
| troop |
| tropeic folds |
| trophic |
| trophic level |
| trophic model |
| tropholytic |
| trophonemata |
| trophotaenia |
| trophotaeniae |
| tropical |
| tropical region |
| tropism |
| trot line |
| trough |
| trouser trawl |
| Trout-perches |
| trucking |
| true hermaphroditism |
| Trumpeters |
| Trumpetfishes |
| truncate |
| trunk |
| Tsukadani |
| Tube-eye or thread-tail |
| Tubeblennies |
| tubercle |
| tuberculate |
| tuberculate ridge |
| tuberous organ |
| Tubeshoulders |
| tubiform |
| tubular |
| tubular eye |
| tubule |
| tuck seine |
| Tulane University Museum of Natural History, Louisiana |
| tumid |
| Tuna ham |
| Tuna links |
| tuna longline |
| Tunas |
| tunicates |
| Turbellaria |
| turbid |
| turbidity |
| turbidity current |
| turbidity of the skin |
| turgid |
| turnover |
| turtle grass |
| tusk |
| Tuyo |
| twin body trawl |
| twin rig |
| two walled net |
| tyee |
| tympanic head spine |
| tympanum |
| tyoptype |
| type |
| type designation |
| type genus |
| type horizon |
| type host |
| type locality |
| type material |
| type selection |
| type series |
| type species |
| type-series |
| type-subspecies |
| typical |
| typonym |
| Tyrrhenian Sea |
