Fish hook in classifier efficiency curves has been receiving attention in the last three decades, more so
with the advent of laser diffractometry. In the first part of this paper, we analyse two occurrences of fish
hook reported recently in Separation and Purification Technology. It is shown that in both the cases, inaccuracies
in measured particle size distributions could be the likely cause of the observed fish hook. In the
second part, we re-examine the present state of knowledge on fish hook including the limitations of
experimental observations reported so far and the drawbacks of theoretical explanations. Finally, we provide
a basis on why it is to be considered nothing more than a scientifically insignificant placebo