GRANT
NUMBER:
NA76FD0106
NMFS NUMBER: 96-NER-044
REPORT
TITLE:
Establishing the Food Web Links between Estuaries and
Nearshore Fisheries in New England
AUTHOR:
Edward Boynton and Linda Deegan
PUBLISH
DATE:
August
3, 1999
AVAILABLE
FROM:
National Marine Fisheries Service, Northeast Region, One
Blackburn Drive, Gloucester, MA 01930. TELEPHONE:
(978) 281-9267
ABSTRACT

This
was a collaborative project between a Gloucester fisherman
and a scientist from the Ecosystems Center of the Marine
Biological Laboratory (MBL) in Woods Hole, Massachusetts.
The two objectives of this study were first to establish
the food web link between the estuaries and the nearshore
fisheries of Ipswich Bay and second to bridge the gap
between fishermen and scientists by learning and understanding
each other's work methods. The project centered
on sampling predetermined sites to ascertain the timing
and magnitude of the migration of estuarine fish going
into the nearshore waters of Ipswich Bay. The study
used stable isotopes to conclusively demonstrate the connection
between forage fish and the estuary. Environmental
data of temperature, salinity, chlorophyll-a, water clarity,
nutrients, and current flow were also examined to ascertain
the trigger mechanisms of the migration. Sampling
for the project began in August 1997. The first
year had 18 sampling days using the F/V SISSEL B.
As the result of a time extension to the project, a second
sampling season took place. Sampling for the second
year began in September 1998. There were eight sampling
days on the vessel and five additional beach seining days
when winds exceeded the safe limits of work aboard the
vessel. All totaled, there were 31 sampling days
for the project. The Ecosystems Center at the MBL
conducted the analysis of the samples collected during
the project and provided a detailed report of its findings.
Briefly, the report stated that "comparison of abundance,
timing, size and stable isotope value of Menidia menidia
in estuary and offshore indicated that large quantities
of fish move offshore in the fall. The importance
of Atlantic silversides as a forage fish for larger coastal
fishes is well known. This study demonstrates that
Atlantic silversides may represent an important trophic
link between marshes and offshore food webs."