The report describes in detail the different parameters that are required by a DEB model, which of those are likely to be found in or derived from the literature and which are unknown and require subjective judgement. Based on an extensive literature search, we provide suggested parameter values for harbour porpoise, bottlenose dolphins, minke whales, harbour seals and grey seals in the UK, noting in each case the literature that was used to derive the parameter and where they were estimated by subjective expert judgement. While recommended parameters were collated for each of the five species, a full DEB model was created for harbour porpoise only. Therefore, the focal species in this report is the harbour porpoise. The text details the results of the literature search for harbour porpoise and exactly how each parameter value was calculated or estimated. Similar detail is provided for bottlenose dolphins, minke whales, harbour seals and grey seals in Appendix 1-4.