ðiːz fˈɪʃ hæv ɐ tˈɑːksɪn, ɡɹˈæmɪstˌɪn, wˌɪtʃ ɪz pɹədˈuːst ɪn ðɛɹ skˈɪn ænd wˌɪtʃ hɐz ɐ bˈɪɾɚ tˈeɪst, ðə pɹədˈʌkʃən ʌvðə tˈɑːksɪn ɪz ɪŋkɹˈiːst wɛn ðə fˈɪʃ ɪz θɹˈɛʔn̩d.
These fish have a toxin, grammistin, which is produced in their skin and which has a bitter taste, the production of the toxin is increased when the fish is threatened.