The report summarizes ecological studies conducted in Moses Lake, Jones Bay, Cedar Bayou and Trinity Bay of the Galveston Bay System. Studies were set up to study larger animals and plants of the project areas, to determine the extent and quality of nursery environment for commercial and recreational fishery species, and to examine related environmental features, before, during and following construction or habitat modification where possible. Various gear were used to sample the biota. Hydrographic studies included sampling for salinity, temperature, turbidity and dissolved oxygen.