Roger Blench (2017) suggests that vocabulary related to aquatic subsistence strategies (such as boats, waterways, river fauna, and fish capture techniques) can be reconstructed for Proto-Austroasiatic.
ɹˈɑːdʒɚ blˈɛntʃ tˈuː θˈaʊzənd sˈɛvəntˌiːn sədʒˈɛsts ðæt voʊkˈæbjʊlˌɛɹi ɹᵻlˈeɪɾᵻd tʊ əkwˈæɾɪk sʌbsˈɪstəns stɹˈæɾədʒiz sˈʌtʃ ɐz bˈoʊts, wˈɔːɾɚwˌeɪz, ɹˈɪvɚ fˈɔːnə, ænd fˈɪʃ kˈæptʃɚ tɛknˈiːks kæn biː ɹˌiːkənstɹˈʌktᵻd fɔːɹ pɹˈoʊɾoʊˌɔːstɹoʊsɪˈæɾɪk.