El izinhlanzi ze-tremielga noma i-torpedo fish, ebizwa nangokuthi tremielgas noma tremielgas, kuyizinhlobo ezihlala zodwa nabagibeli ababi abavame ukutholakala becishe bigqitshwe ngokuphelele esihlabathini noma odakeni, kushiya kuphela amehlo nemiphetho ebonakalayo. Le nhlanzi ibonakala ngemikhuba yayo yokuhlala kanye ne-disc yayo eyinyama eneziphetho eziyindilinga ezibangelwa ukuhlangana komzimba namaphiko we-pectoral.
Umzimba we i-tremielga icindezeleke ngokweqile, futhi amaphiko we-pectoral, ayindilinga, ahlanganiswe eceleni kwawo, enza ngawo idiski elicabalele ngokuma kwawo ngaphambili.
Amaphiko okhalweni, nawo ayindilinga, avela ngaphansi kwama-pectorals, futhi anamathiselwe engxenyeni engaphakathi yomsila, ephela ngomphetho owakhiwe kahle we-caudal. Emgqeni ophakathi nendawo, umsila unezimpiko ezimbili zasemuva. I- amehlo mancane kakhulu kepha avelele, ikuvumela ukuthi ubheke okukuzungezile nomzimba wakho umbozwe ngokuphelele.
Umlomo we-arched ukhombisa amazinyo amancane ahlelwe ngemigqa. Isikhumba sibushelelezi, kuthi ngemuva kunezitho zombili zikagesi lezo kuveza ukushaqeka okukhulu lapho i-tremielga izwa ukuthi iyahlukunyezwa, lokhu kukhishwa, yize kuyacasula, akuyona ingozi kumuntu. Imisinga evame kakhulu ibanga phakathi kwama-volts angama-45 kuye kwangama-80, yize ezimweni ezithile nasezibonelweni ezinkulu kakhulu angafinyelela kuma-volts angama-220. Ngisho nezinsana ezisanda kuzalwa ziyakwazi ukukhiqiza ukushaqeka okungaba ngu-4 volts.
Bangakwazi ukukhiqiza ugesi ngokuthanda kwabo sibonga izitho ezimbili ezimise okwezinso nombala okhanyayo obizwa nge- “electroplasts”. Lezi zitho zitholakala ngaphambili kwediski, ohlangothini ngalunye lwekhanda.
I-tremielga iyinhlobo yemikhuba yasebusuku futhi izondla ngayo izinto ze-benthic. I-ovoviviparous futhi ukukhulelwa kuthatha cishe izinyanga eziyishumi futhi ingathwala imibungu ephakathi kuka-5 no-32, kuya ngosayizi wesifazane.