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  • Status of Fishery Resources off the Northeastern US
    NEFSC - Resource Evaluation and Assessment Division



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    Revised
    December 2006

    Scup

    Scup (Stenotomus chrysops)

    by Mark Terceiro






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    Figure 15.1 Statistical areas used to define the Scup stock.
    Figure 15.1 Statistical Areas Used

    Distribution, Biology and Management

    Scup or porgy, Stenotomus chrysops, is a demersal, schooling species distributed in the Mid Atlantic Bight from Cape Cod, MA to Cape Hatteras, NC. Previous tagging studies have indicated the possibility of two stocks, one in Southern New England waters and the other extending south from New Jersey. However, the lack of definitive tag return data from these studies, coupled with distributional information from NEFSC trawl surveys, support the concept of a single unit stock from New England to Cape Hatteras (Figure 15.1). A new industry-cooperative tagging study for scup, designed to evaluate fish movement and estimate mortality rates, was initiated in 2005.

    Scup undertake extensive migrations between coastal waters in summer and offshore waters in winter, migrating north and inshore to spawn in spring. Sexual maturity is essentially complete by age 3 at a total length of 21 cm (O’Brien et al. 1993). Scup attain a maximum fork length of about 40 cm, and ages of up to at least 14 years.

     
    U.S. commercial and recreational fisheries for scup are managed under the under the Summer Flounder, Scup and Black Sea Bass Fishery Management Plan (FMP) administered jointly by the Atlantic States Marine Fisheries Commission (ASMFC) and the Mid-Atlantic Fishery Management Council (MAFMC). Amendment 8 to the original Summer Flounder FMP incorporated scup into the FMP and implemented several major regulatory provisions for scup, including annual commercial quotas, recreational harvest limits, permit requirements, minimum fish size and gear restrictions, and a recreational fishery possession limit.

    The Fishery

    The principal gear used in commercial fishing for scup is the otter trawl. After peaking at 24,700 mt in 1963, commercial landings markedly decreased and averaged 5,400 mt annually during 1986-1995, and ranged between 1,200 mt and 4,400 mt during 1996-2005 (Table 15.1, Figure 15.2 [Fig 15.2 Data]). The recreational rod-and-reel fishery for scup harvests a significant proportion of the total catch. After peaking at 5,300 mt in 1986, recreational landings averaged 2,300 mt annually during 1986-1995, and ranged between 400 mt and 3,800 mt during 1996-2005 (Table 15.1, Figure 15.3 [Fig 15.3 Data]).

     

    Figure 15.2.  Total commercial landings of scup, 1940-2004.Figure 15.2

    Figure 15.3.  Spawning Stock Biomass indices (stratified mean SSB kg per tow; 3 year moving averages) for scup from NEFSC research vessel surveys.  Solid horizontal line is the spring survey-based biomass threshold.Figure 15.3

    Figure 15.4.  Age 1+ structure of the scup population, 1976-2004.
    Figure 15.4

    Figure 16.5.  Trends in total fishery catch of scup.
    Figure 15.5

    Figure 15.6.  Yield and SSB per recruit results for scup.
    Figure 15.6

    Research Vessel Survey Indices and Assessment

    NEFSC spring and autumn survey biomass indices for scup have exhibited similar trends during the survey time series. The assessment for scup is currently index-based, and relies on the NEFSC spring survey spawning stock biomass (SSB) kg per tow index as the primary measure of stock biomass (Figure 15.4 [Fig 15.4 Data]).

    SSB indices peaked in the late-1970s and then declined until the late 1990s. SSB indices have increased since 1999 but have been highly variable. As stock biomass declined during the 1980s, the age structure of the scup population became truncated, with a low proportion of fish at ages 3 and older (Figure 15.5 [Fig 15.5 Data]). Since 2000, the age structure of the population has expanded to approximate that observed in the late-1970s (Figure 15.5 [Fig 15.5 Data]).

    Biological Reference Points

    Yield and SSB per recruit based reference points for scup (Figure 15.6 [Fig 15.6 Data]) were last calculated in the 1998 assessment (NEFSC 1998) and are presented in Table 15.2. The lack of an analytical assessment for scup has prevented the estimation of MSY based reference points. The fishing mortality threshold of Fmsy is defined to be Fmax, currently at F = 0.26, and the index-based biomass threshold is set at the 1977-1979 average of the NEFSC spring trawl survey Spawning Stock Biomass (SSB) kg per tow value of 2.77.

    Summary

    Recent NEFSC spring SSB indices indicate that the stock is in an overfished condition; stock status with respect to the overfishing threshold (Fmsy = Fmax) cannot currently be evaluated as there is no reliable estimate of fishing mortality available for scup.

    Old lineart drawing

     

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    Table 15.1 Recreational and commercial landings of scup (thousand metric tons).

    Category 1986-95 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005
      Average                    
                           
     U.S. Recreational 2.3 1.0 0.5 0.4 0.9 2.4 1.9 1.6 3.8 2.0 1.1
     Commercial                      
           United States 5.4 2.9 2.2 1.9 1.5 1.2 1.7 3.2 4.4 4.2 4.2
           Canada - - - - - - - - - -  
           Other - - - - - - - - - -  
     Total Nominal Catch 7.7 3.9 2.7 2.3 2.4 3.6 3.6 4.8 8.2 6.2 5.3
                           


    Table 15.2 Yield and SSB per Recruit Based Reference Points for scup.

     Yield and SSB per Recruit-based Reference Points
     Fmax = Fmax = 0.26

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    For further information

    Northeast Fisheries Science Center (NEFSC) 1998. 27th Northeast regional stock assessment workshop (27th SAW). Stock Assessment Review Committee (SARC) consensus summary of assessments. NEFSC Ref. Doc. 98-15, 350 p.

    Northeast Fisheries Science Center (NEFSC) 2002. 35th Northeast regional stock assessment workshop (35th SAW). Stock Assessment Review Committee (SARC) consensus summary of assessments. NEFSC Ref. Doc. 02-14, 259 p.

    O’Brien, L., J. Burnett, and R.K. Mayo. 1993. Maturation of nineteen species of finfish off the northeast coast of the United States, 1985-1990. NOAA Tech. Report. NMFS 113, 66 p.


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