E6 CHLOROPHYLL CONCENTRATION [micro g l-1](Q) Metangula Depth [m] Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 10 0.25 - 0.6 0.7 0.65 1.3 1.0 1.2 0.25 0.2 0.2 0.5 50 1.5 - 0.5 0.55 0.7 0.5 0.6 0.5 0.35 0.5 0.1 0.7