The megadiverse Neotropical freshwater ichthyofauna is the richest in the world with approximately 6,000 recognized species. Interestingly, they are distributed among only 17 orders, and almost 80% of them belong to only three orders: Characiformes, Siluriformes and Perciformes. Moreover, evidence based on molecular data has shown that most of the diversification of the Neotropical ichthyofauna occurred recently. These characteristics make the taxonomy and identification of this fauna a great challenge, even when using molecular approaches. In this context, the present study aimed to test the effectiveness of the barcoding methodology (COI gene) to identify the mega diverse freshwater fish fauna from the Neotropical region. For this purpose, 254 species of fishes were analyzed from the Upper Parana River basin, an area representative of the larger Neotropical region.

Background and aims. The Fish Barcode of Life campaign involves a broad international collaboration among scientists working to advance the identification of fishes using DNA barcodes. With over 25% of the world's known ichthyofauna currently profiled, forensic identification of seafood products is now feasible and is becoming routine. Materials and methods. Driven by growing consumer interest in the food supply, investigative reporters from five different media establishments procured seafood samples (n = 254) from numerous retail establishments located among five Canadian metropolitan areas between 2008 and 2010. The specimens were sent to the Canadian Centre for DNA Barcoding for analysis. By integrating the results from these individual case studies in a summary analysis, we provide a broad perspective on seafood substitution across Canada. Results. Barcodes were recovered from 93% of the samples (n = 236), and identified using the Barcode of Life Data Systems “species identification” engine (www.barcodinglife.org). A 99% sequence similarity threshold was employed as a conservative matching criterion for specimen identification to the species level. Comparing these results against the Canadian Food Inspection Agency's “Fish List” a guideline to interpreting “false, misleading or deceptive” names (as per s 27 of the Fish Inspection regulations) demonstrated that 41% of the samples were mislabeled. Most samples were readily identified; however, this was not true in all cases because some samples had no close match. Others were ambiguous due to limited barcode resolution (or imperfect taxonomy) observed within a few closely related species complexes. The latter cases did not significantly impact the results because even the partial resolution achieved was sufficient to demonstrate mislabeling. Conclusion. This work highlights the functional utility of barcoding for the identification of diverse market samples. It also demonstrates how barcoding serves as a bridge linking scientific nomenclature with approved market names, potentially empowering regulatory bodies to enforce labeling standards. By synchronizing taxonomic effort with sequencing effort and database curation, barcoding provides a molecular identification resource of service to applied forensics.

The Fish barcode of life (FISH-BOL) initiative seeks to establish a reference sequence library of short, standardized mitochondrial gene sequences derived from the 5′ end of the cytochrome c oxidase subunit I gene (DNA barcodes) to facilitate the rapid, accurate, and cost-effective DNA-based identification of all fishes, regardless of life-stage, sex, or specimen condition. This task requires the participation of scientists from around the world and its success is predicated on the development and acceptance of standard protocols for the collection of specimens associated provenance data. Here, we provide guidelines for specimen collection, imaging, preservation, and archival, as well as meta-data collection and submission protocols developed for the FISH-BOL campaign in order to promote efficient participation in FISH-BOL by a broadening array of international participants.

This special issue features eleven articles presented at the Pathway to Increase Standards and Competency of eDNA Surveys (PISCeS) conference in October 2018. The prominent theme in this special issue is methodological developments to enhance species and community characterization using eDNA, covering tree main scientific trends: validation of eDNA detections, methodological innovations in eDNA research, and standardization of eDNA practices. Articles in this special issue cover advances on single‐species detection and metabarcoding, and examine eDNA methods standardization. Strong collaboration among academics, regulators, and industry present in the eDNA community is evidenced by the research presented here.