Ecosystem Targets and Supporting Indicators

Forage Fish – Open Water/NY and CT Coastlines

The forage indices measures the productivity of small fish in the Sound, which is the basis of the food supply for larger fish, including game fish.

Show/Hide Table Data

Forage Fish
Open Water Weight (Kg) per TowCT Coastline Count per TowNY Coastline Count per Tow
1988N/A138.782011
1989N/A61.841203
1990N/A64.45276
1991N/A109.68772
199211.3670.951142
199312.6964.71254
199410.9257.06807
199512.7142.47509
199613.1425.85483
199714.2232.23411
199814.3799.96770
199920.56126.89704
200022.54146.29518
200111.9152.39602
200216.06125.35829
20036.49206.41597
200414.52129.751953
200514.57121.74847
200611.9359.38292
200716.06149.47736
200813.6099.64335
200917.32106.05382
2010N/A137.021225
201110.55126.73628
201216.1860.46235
20136.8546.37221
201413.73104.36862
201516.22171.221120
201630.9999.19672
201718.16106.75501
2018760
754

WHAT ARE FORAGE FISH?

Forage fish are small, fast-growing species that provide the majority of the food supply for larger fish, including game fish such as striped bass and bluefish, and mammals such as seals. Forage fish can also include juvenile stages of larger species which school in large numbers, such as scup, bluefish, and weakfish. Many forage fish inhabit the low marsh and intertidal areas of the shoreline and are food for birds, reptiles, and crabs.

 WHAT DOES THIS INDICATE?

The Connecticut Coastline Forage indicator uses data collected from the CTDEEP Seine Survey, which was established in 1988.  The survey is conducted in September at eight beach sites, from Groton to Greenwich, where six standardized seine-hauls are taken. The index is a composite mean catch (# of individuals)/haul of four species: Atlantic silversides, striped killifish, mummichog, and sheepshead minnow.  It is designed as an indicator of forage availability in intertidal and shallow water.

The Long Island Sound Open Water Forage index uses data collected from the Long Island Sound Trawl Survey, which was established in 1984. Survey catch data from spring (May, June) and fall (September, October) Survey cruises of 14 common “forage” species are averaged into a composite geometric mean biomass/tow.  These species are key small-sized adults (e.g., blueback herring, butterfish, and menhaden) or the ‘young-of-year’ life stage of abundant schooling species (i.e., weakfish, bluefish, and scup). These species are important forage for larger game fish commonly sought after by recreational anglers (e.g. bluefish, striped bass, and summer flounder).  It is designed as an indicator of forage availability for open water species and may shed light on trends in the abundance of phytoplankton and zooplankton assemblages needed as their food base as well.

The New York Coastline Forage indicator uses data collected from the NYSDEC Western Long Island Sound Seine Survey, which was established in 1984.  The survey is conducted from May to October at twenty beach sites across four bays/harbors.  There are four sampling stations in both Little Neck Bay and Manhasset Bay and six sampling stations in both Oyster Bay and Hempstead Harbor. The index is a composite mean catch (# of individuals)/haul of four species: Atlantic silversides, striped killifish, mummichog, and sheepshead minnow.  It is designed as an indicator of forage availability in intertidal and shallow water.

STATUS

The increasing trend in the Connecticut Coastline Forage index from the late 1990s to early ’00s indicates that productivity in the intertidal zone and marshes is good. Connecticut and the New York Coastline Forage indices have remained stable for the last decade, though there is high interannual variability. For both indices, 2012 and 2013 were poor years, which may have been a result of the destruction of habitat from Hurricane Sandy. The numbers rebounded in 2014. The stable trend in the Open Water Forage index indicates that the Sound has a sufficient food base to support the wide diversity of resident marine species as well as those that migrate into the Sound specifically because it is a rich feeding ground.

DATA NOTES

  • The data is from the fall season of the Long Island Sound Trawl Survey.
  • *Data was not available for 2010. The research vessel was out of service during June, September, and October sampling.

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