aching ), ▁som ers ault , ▁sp y - h op ▁or ▁tail - spl ash . ▁They ▁are ▁unlikely , ▁however , ▁to ▁approach ▁boats . ▁ ▁T uc ux is ▁have ▁been ▁observed ▁to ▁feed ▁with ▁other ▁river ▁dol ph ins . ▁They ▁feed ▁on ▁a ▁wide ▁variety ▁of ▁fish . ▁Studies ▁of ▁growth ▁layers ▁suggest ▁the ▁species ▁can ▁live ▁up ▁to ▁ 3 5 ▁years . ▁The ▁oldest ▁ ▁known ▁animal ▁was ▁ 3 6 ▁years ▁of ▁age . ▁ ▁Conserv ation ▁ ▁The ▁t uc ux i ▁is ▁en demic ▁to ▁the ▁regions ▁described ▁above ; ▁although ▁no ▁precise ▁estimates ▁of ▁population ▁are ▁available , ▁it ▁is ▁common . ▁A ▁significant ▁human ▁problem ▁is ▁fish ing ▁n ets . ▁D eli ber ate ▁hunting ▁in ▁the ▁Amazon ▁bas in ▁for ▁food ▁has ▁also ▁been ▁reported . ▁Pol l ution , ▁in ▁particular , ▁mer cur y ▁poison ing ▁of ▁water ▁due ▁to ▁gold ▁min ing , ▁is ▁a ▁particular ▁concern ▁for ▁this ▁species . ▁The ▁IU CN ▁also ▁c ites ▁habitat ▁fragment ation ▁by ▁dam ▁construction ▁as ▁a ▁threat , ▁though ▁more ▁detailed ▁study ▁is ▁necessary . ▁ ▁T uc ux is ▁are ▁observed ▁not ▁to ▁maintain ▁good ▁health ▁and ▁attitude ▁in ▁capt ive ▁environments . ▁A ▁few ▁t uc ux is ▁remained ▁in ▁capt ivity ▁in ▁European ▁aqu aria , ▁but ▁the ▁last ▁one ▁(" P aco ") ▁died ▁in ▁ 2 0 0 9 ▁in ▁the ▁Z oo ▁of ▁Mün ster , ▁Germany . ▁ ▁The ▁t