The plankton is divisible into two main groups, the phytoplankton and the zooplankton. The primary productivity which we discussed in chapter 10 is primarily the functional aspect of phytoplankton - the other chlorophyll bearing organisms are also to be included, but in most water bodies such as the culture pond an index of primary productivity could be obtained by the mass or number of phytoplankton in a unit volume of water

1. Phyto-Zoo-Benthos-fish relationship
By-
Mohammad Belal Hossain
Lecturer
FIMS, NSTU

3. Phytoplankton are consumed by many organisms,
including diverse species of zooplankton.
Zooplankton are free-floating consumers and
include single-celled protozoa, tiny crustaceans,
and the larval stages of species such as mollusks
and fish.
Zooplankton and phytoplankton are consumed by
the nekton, free-swimming marine organisms such
as fish, marine mammals, and penguins, as well as
species on the ocean bottom, including bivalves,
crustaceans, and snails.

6. References
1. Introduction to Marine Biology- McConnaughey
2. The Oceans –Sverdrup et al

7. References
1. Introduction to Marine Biology- McConnaughey
2. The Oceans –Sverdrup et al