Fishes of the Conambo River Basin, an unexplored area in the Ecuadorian Amazon: first annotated checklist

The ichthyofauna of the Ecuadorian portion of the Marañón drainage remains poorly documented, particularly in the tributaries of the Tigre River. Here, we provide the first consolidated dataset of freshwater fish species from the Conambo River, including voucher-based records, locality information, habitat and hydrological context, fisheries practices, and photographic documentation. The dataset comprises 118 species representing seven orders and 31 families, including taxa not previously recorded for Ecuador and specimens that may represent undescribed species. A complementary dataset documents fish species captured by Shiwiar and Sapara fishers, providing additional information on locally important taxa and subsistence practices. Together, these datasets offer a new baseline for taxonomic, biogeographic, and ecological research in one of the least studied regions of the Ecuadorian Amazon and support future efforts to document and understand freshwater biodiversity in the Marañón drainage.