T H E PRODUCTION O F MARINE I'LANKTON
181
by Loosanoff and Davis (1963), alao indicates the importance of an
adequate food concentration for the rearing of various species. While
such observations demonstrate repeatedly the importance of food
supply on egg and larval production, we do not have detailed and
accurate knowledge of the precise operation of this factor. The tank
1.'
0.
0.0
L
x 0
.Y
Y
5" 0.00
c
0.000
0.0000
i
FIQ. 13. The theoretical production of algae, and of Calanm and "other copepods" as
mg wet weight per litre for the period January to June; (from Cushhg, 1969; reprinted
from "Plankton and Productivity in the Oceans", Pergamon Press).
0