Landings, abundance indicators, and biological data for a potential range-wide American eel stock assessment / by David K. Cairns. : Fs97-13/1311E-PDF

"This document compiles fisheries landings, abundance indices, and biological data to support an eventual range-wide stock assessment of the American eel (Anguilla rostrata). The plausible native continental range of the American eel covers 8,516,045 km², but the currently occupied actual range has not been reliably mapped. Canadian landings of American eels are tabulated, for the most part, starting in the 1870s. US landings are tabulated starting in 1879. UN Food and Agricultural Organization American eel landings for Mexico, Cuba, and the Dominican Republic are incompatible with information provided by national governments to an American eel range states workshop held in 2018. Landings for these countries, and also for Jamaica and Haiti, are taken from data supplied to the workshop. Landings data are subject to increasing uncertainty with the age of data. Marine Recreational Information Program (MRIP) estimates of eel landings and catch rates in coastal waters between Maine and Louisiana are tabulated. MRIP provides the most geographically widely based relative abundance dataset for the American eel but estimation error is high. Reported American eel landings for all regions and stages for 1880-2015 total 243,153 t. Thirty-seven American eel abundance series in Canadian and Canada-US border waters are tabulated, and examined for potential errors and biases. Compilations of elver lengths, eel densities, and eel sex ratio statistics are provided to supplement an earlier compilation of biological data. Nearly all American eel demographic data and genetic samples come from the Western Atlantic area. An American eel assessment that covers all parts of the species range will likely require both new data collections and novel assessment methodologies. Data associated with this report are stored as Online Supplemental Material"--Abstract, page v.

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