Randall E. Hicks has written:

'Gas chromatographic analysis of muramic acid and glucosamine for microbial biomass determinations' -- subject- s -: Microbial ecology, Measurement, Biomass, Glucosamine, Estuarine sediments

Fatter and bigger, takes up more space

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No, that would be the greatest volume. Mass is something you weigh on a scale, and measure in grams or kilograms. Some organisms are denser than others.

In ecology, "biomass" is the mass of a group of living organisms.

Bert R Mead has written:

'Phytomass in southeast Alaska' -- subject(s): Forest conservation, Vegetation surveys, Plant biomass, Plant ecology

Peggy W. Lehman has written:

'Phytoplankton species composition, size structure, and biomass and their possible effect on copepod food availability in the low salinity zone of the San Francisco Bay/Delta Estuary' -- subject(s): Aquatic ecology, Copepoda, Food chains (Ecology), Phytoplankton

There are several different disciplines within ecology. Those include animal ecology, population ecology, quantitative ecology, community ecology, and molecular ecology.