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The seasonal and regional distributions of the non - biological parameters ( such as salinity , temperature , dissolved oxygen , pH , nutrients ( nitrite , nitrate , phosphate and silicate ) , chlorophyll-a , adenosine triphosphate , particulate organic carbon and heavy metals ( including copper and zinc ) , and the biological parameters ( such as primary productivity , species composition and interspecific relationships among phyto - and zooplanktons , algae , invertebrates , and fishes ) before ( from August 1992 to July 1993 ) and during ( from August 1993 to July 1995 ) the algae-marine ranching periods are investigated . The scientists will return several more times this year and for the next two years to catch the Gulf of Alaska during different phases - - a phytoplankton explosion in April ; zooplanktons ' response in May ; the return of the salmon in July ; the increased ocean mixing and current flow in October ; and the shutdown of the system in December 's darkness . For example , to understand the factors controlling recruitment in these fish populations , information is needed on the various life stages ( including larvae , juveniles , and adults ) as well as several other trophic levels , such as primary producers , zooplankton , and other invertebrates . The first position will involve collection of nearshore macroinvertebrate , zooplankton , and water chemistry data to begin a monitoring plan for Michigan 's nearshore waters . The predator-prey relationship of Cod , Haddock , and two species of zooplankton ( Calanus finmarchicus and Pseudocalanus ) to their physical environment being studied in order to be able to predict changes in the distribution and abundance of these species as a result of changes in the physical and biotic environments . Zooplankton are the specialty of Ken Coyle , also a scientist at UAF 's Institute of Marine Science .