The fieldwork methodology differs depending on the monitored area or species. Benthic species and areas are mostly monitored by standard benthos research methods that include visual inspection, photo documentation, and sample collection. These activities are performed by autonomous diving, scuba diving or inspection and collection from the shore. A specific field procedure is always related to a specific area of ​​research or a specific spec, and for a particular situation should be suggested by an expert. Sampling of bentopelagic fauna and mobile epifauna (fish, crustaceans) will be performed primarily by the method of visual census (autonomous diving and scuba diving) with photo documentation. Given that commercial fishing monitoring programs already represent a kind of sampling with active and passive fishing gear, data from such programs will be used for the purpose of their detection (data collected through D3 - populations of economically important fish, crabs and shellfish). New scientific knowledge has also recognized local ecological knowledge (LEK) as a very efficient way of obtaining information on non-native species, and the same will be used in that purpose. It is about conducting targeted interviews with fishermen, which would thus contribute to the knowledge of the occurrence of non-native species in the areas where they fish. The introduction of planktonic alien species will be monitored as part of pelagic monitoring. Data collection is also done by involving the public in the observation network (citizen-science) through social media.