13. Biology and culture technics of commercially important aquatic species

parts including organisms, the communities they make up, and the non-living components of their environment such as light, water movements, temperature, exct..  An ecosystem is

environment, natural history, or environmental science.  It is related

as determined by the number of energy- transfer steps required to reach that level. (Begon

parts, such as leaves or twigs, or in the form of dissolved organic matter....  The organic material used as a

accumulated material at a given moment, while production is the rate of increase in the total biomass...  Biomass may be lost by export

 High biomass does not necessarily imply.

biomass), and provides a better indication of energy transfer between trophic levels than instantaneous measures of

single-celled organisms to large aquatic plants called aquatic macrophytes..  Autotrophs are