  CosmicFish is a publicly available library to perform Fisher matrix forecast
for several cosmological observations. With the present implementation notes we
provide a guide to the physical and technical details of the library. We
reproduce here the details and all the relevant equations, as they appear in
the code. We submit these notes to the arXiv to grant full and permanent access
to this material which provides a useful guidance to forecasting and the use of
CosmicFish code. We will update this set of notes when relevant modifications
to the CosmicFish code will be released. The present version is based on
CosmicFish Jun16.
