During the past summer Mr. Holt has sent me from time to time young specimens of fish which he has collected, in order that I might report upon the evidence which they afforded as to the rate of growth of the various species in the North Sea. He has also supplied me with a complete list containing the names and the measurements of all the specimens he has collected, including many others besides those sent to me. I have simply studied the specimens and the list, and endeavoured to estimate the probable ages of the specimens. The necessary information as to the limits and duration of the spawning period in the case of each species has also been supplied to me by Mr. Holt. I have registered below the obseryed specimens of each species separately in the chronological order, of their capture. All have been collected in the course of the current year.