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Since the fish populations (P) in nature repeat their growth and decay (accompanying with extension and contraction of their areas) under some invisible influences of natural environmental conditions, the fisheries conditions and the resulting amount of catch (N) for each fish species (sardine, herring, tuna etc.) vary year by year cyclically (in pe riodic or some irregular ways) with near a century or twenty to thirty, fifty to sixty years intervals. (See Table 1 a, b) In general as for the periodic decaying (or growing) yield. ?? (1)

A Consideration on the Long Years Trend of the Fisheries Fluctuation in Relation to Sea Conditions