Spatial and temporal zooplankton biomass distribution obtained
during three oceanographic cruises in the Gulf of Tehuantepec, Mexico, located
between 14°30'-16°12' N and 92°00'-96°30' W, in the eastern tropical Pacific
Ocean in January, May, and November, 1989, is presented. Samples were obtained
by double-oblique hauls with a 333-505 um bongo net. The study was
done with samples from the 333-J-Lm net, extrapolating the values to g/100 m3 of
wet weight. In January, values between 78 and 3,340 g/100 m3 were found; results
in May were between 143 and 6,920 g/100 m3; and in November, between
27 and 2,290 g/100 m3 . We consider that the distributions obtained in January
and in November were induced by upwelling and the contribution of the
coastal lagoons. In May, zooplanktonic biomass was determined by the prevailing
currents that ascend over the Chiapas continental slope
