Appendix – Remote Sensing

Introduction The first part of this appendix, presented in Bremerhaven in January 2001, entitled “Using remote sensing to determine estimates of secondary production” detailed how satellite derived estimates of sea surface temperature (SST) and chlorophyll were used as an input into the copepod egg production model of Prestidge et al. (1995). The model was run for two genera of copepod namely Calanus and Acartia, these being taken as representative of a large and small copepod respectively. The output of the model has units of number of eggs per female per day and as such needs to be multiplied by the number of females present within any one location to obtain the secondary production. Such data can be obtained from the Continuous Plankton Recorder (CPR) survey. This step, as reported in the previous appendix document, resulted in a computed daily egg production. The next step allows the computation of standing stock biomass for C. finmarchicus, C. helgolandicus and Acartia (using data for Psuedocalanus) and, once raised by a proportion of the gut contents represented by these two genera, an estimation for the food available to mackerel larvae can be obtained.