Mesozooplankton abundance in the Bristol Channel, Celtic Sea and English Channel 2012-2016 dataset https://portal.medin.org.uk/portal/start.php?tpc=009_CEFAS27f3260b-fe6b-4092-9699-0442cc36b0a4 Mesozooplankton abundance data gathered as part of an annual autumn pelagic survey in the English Channel, Celtic Sea and Bristol Channel, running from 2012-2016. Samples were obtained using twin ringnet deployments and subsequently processed back at the lab using ZooScan image analysis. Count abundances from semi-automatic image classifications on Plankton Identifier (and later, EcoTaxa) were then converted into abundances per m3 using estimates of filtered volume from flowmeter readings. The current dataset comprises mesozooplankton results from the POSEIDON survey series which ran until 2016, although results have continued to be obtained as part of the expanded PELTIC survey series, which has been ongoing since 2017. 20220825 20150310