Many of these fishes originate from fast-moving waters, where the sucker allows the fish to 'stick' itself down without too much difficulty.
mˈɛnɪəv ðiːz fˈɪʃᵻz ɚɹˈɪdʒᵻnˌeɪt fɹʌm fˈæstmˈuːvɪŋ wˈɔːɾɚz, wˌɛɹ ðə sˈʌkɚɹ ɐlˈaʊz ðə fˈɪʃ tʊ stˈɪk ɪtsˈɛlf dˌaʊn wɪðˌaʊt tˈuː mʌtʃ dˈɪfɪkˌʌlti.