Seasonal variations in the Indian Ocean along 110°E. V. Zooplankton biomass

Abstract

Samples of the zooplankton in the upper 200 m were taken with the Indian Ocean Standard Net and Clarke-Bumpus sampler, and their wet weights were determined. Biomass ranged from 3 to 525 mg/m³, the general level being 25-100 mg/m³. The average value by day was 0.6 times that by night. Biomass was fairly uniform over a wide central region (16-27º S.), increasing further north and decreasing further south. The biomass was greatest in September and March and least in December and June.