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AquaAuma / FishGlob_data

Database and methods related to the manuscript "An integrated database of fish biodiversity sampled with scientific bottom trawl surveys"
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QAQC for European surveys #26

Closed AquaAuma closed 9 months ago

AquaAuma commented 1 year ago

Comparing weights from abundance and length, and reported weights in the datasets. New folder with results on this available: https://github.com/AquaAuma/FishGlob_data/tree/main/QAQC/DATRAS

More work/checks need to be made for surveys for which weights don't match, but abundances do. Most likely due to three aspects (i) quality of length-weight relationships, (ii) units/values of lengths in the datasets, (iii) units of reported weight at the haul level, as was noted as an issue by DATRAS https://www.ices.dk/data/data-portals/Pages/DATRAS-News-and-updates.aspx image (iii) does not affect the current dataset, because we did not use the reported weights, but the re-calculated ones

AquaAuma commented 9 months ago

we documented the correlations between reported weights and re-estimated weight from abundance at length in DATRAS surveys to make users aware of this issue in the dataset, but the ICES DATRAS Data team (Vaishav Soni) indicated this was an ongoing issue for which they're working on solutions.