Ce

photophore at the upper end of the gill cover where it meets the lateral line in Myctophidae

common era, a non-religious way of expressing years in the calendar based on the years of the Christian era. Note there is no year 0 so the year before 1 CE (or 1 A.D.) is 1BCE (or 1 B.C.)

equilibrium catch ( the catch (in numbers) taken from a fish stock when it is in equilibrium with fishing of a given intensity, and (apart from the effects of environmental variation) its abundance does not change from one year to the next (Ricker, 1975). Also called sustainable yield, equilibrium yield)