Production in the Indian Ocean and the Transfer from the Primary to the Secondary Level 477
each monsoon (Figs. la, b). The average values are raised by 180 to give gC m- 2 180
day-l in each monsoon (Figs. 2 a, b see also map on the inside of the back cover).
Estimates of zooplankton biomass, sampled with the 1 m net, or the Juday net
(see TRANTER, 1963, for a comparison of nets; BARNES and TRANTER, 1965, show that
the Juday net catches 1.6 x the quantity caught by the Indian Ocean standard net, but
Fig.2a
lD"
10'
60'
ro'
10'
30"
100'
110'
110"
13{1'
l~O'
lID' E
/ IN n/ri
I /
Fig.2b
Fig. 2. Primary productivity in the Indian Ocean in gC m- 2 180 day-to a) in the SW monsoon;
b) in the NE monsoon