GRANT
NUMBER: NA76FD0106
NMFS NUMBER: 96-NER-044
REPORT
TITLE: Establishing
the Food Web Links between Estuaries and Nearshore Fisheries
of New England
AUTHOR:
Dr. Edward Boynton
PUBLISH
DATE: June
29, 1999
AVAILABLE
FROM:
National Marine Fisheries Service, One Blackburn Drive,
Gloucester, MA 01930. TELEPHONE: (978) 281-9267
ABSTRACT

This was a
collaborative project between a local fisherman from Gloucester
and a scientist from the Ecosystems Center of the Marine
Biological Laboratory at Woods Hole, Mass. The two objectives
of this study were (1) Establish the food web link between
the estuaries and the nearshore fisheries of Ipswich Bay
and (2) Bridge the gap that is present between fishermen
and scientists by understanding each others methods of
work by performing the following scientific study.
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 on August 15, 1997. The
first year had 18 sampling days using the fishing vessel
"Sissel B". In December of 1997 it was
decided to ask for a one-year no-cost extension. This
permitted the project to have a second season of sampling.
Sampling for the second year began again on September
25, 1998. There were 8 sampling days on the vessel and
5 additional beach seining days when winds exceeded safe
limits of work aboard the vessel. The last sampling day
of the project was on December 16, 1998. All total there
were 31 sampling days for the project. The Ecosystems
Center at the Marine Biological Laboratory at Woods Hole
conducted the analysis of the samples collected in this
project. The analysis found that comparison of abundance,
timing, size and stable isotope value of M. mendia
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 demonstrated that the Atlantic
silversides may represent an important trophic link between
marshes and offshore food webs.