CRD 03-14

Table 25. Stratified mean number, weight (kg), length (cm), and individual weight (kg) per tow of witch flounder in NEFSC offshore spring and autumn bottom trawl surveys in Gulf of Maine-Georges Bank region (strata 22-30,36-40), 1963-2003.

Year
SPRING
AUTUMN
Number
per tow		 Weight
per tow		 Length
per tow		 Ave. wt.
per tow		 Number
per tow		 Weight
per tow		 Length
per tow		 Ave. wt.
per tow
1963 - - - -

5.52

 3.46 39.7 0.627
1964 - - - -

2.89

 2.00 44.2 0.691
1965 - - - -

3.94

 2.27 40.6 0.577
1966 - - - -

7.80

 4.56 41.2 0.584
1967 - - - -

3.01

 2.02 43.7 0.673
1968 4.83 3.35 42.3 0.695 4.82 3.49 44.8 0.724
1969 3.74 2.53 45.3 0.676 5.81 4.40 43.5 0.757
1970 6.39 4.49 44.7 0.702 4.89 3.71 45.0 0.760
1971 2.70 2.04 46.5 0.756 4.32 2.95 42.1 0.683
1972 5.35 4.01 45.8 0.749 3.24 2.42 43.9 0.747
1973 8.20 6.21 44.8 0.758 3.18 2.05 43.6 0.646
1974 6.23 3.62 39.3 0.581 2.38 1.58 41.0 0.666
1975 3.72 2.75 43.9 0.739 1.66 1.03 39.8 0.621
1976 5.50 3.70 42.3 0.673 1.34 0.94 41.9 0.699
1977 4.20 1.96 37.2 0.467 5.06 3.38 42.0 0.669
1978 3.87 2.56 41.7 0.662 4.04 2.94 42.8 0.727
1979 2.91 1.71 38.2 0.587 1.94 1.62 45.2 0.838
1980 8.46 3.89 36.0 0.460 2.62 2.04 43.7 0.777
1981 8.14 4.05 38.0 0.497 3.66 2.19 40.4 0.600
1982 3.64 1.87 37.2 0.513 0.99 0.83 44.7 0.842
1983 6.41 2.74 36.3 0.427 4.72 2.12 36.7 0.448
1984 3.00 1.66 39.9 0.554 4.37 2.34 39.7 0.534
1985 5.18 2.75 40.3 0.531 2.76 1.59 41.9 0.577
1986 2.07 1.35 44.1 0.650 1.59 1.09 43.3 0.683
1987 1.01 0.65 43.4 0.646 0.48 0.37 43.9 0.774
1988 1.43 0.85 42.3 0.590 1.38 0.57 35.2 0.414
1989 1.95 0.74 35.8 0.382 0.89 0.38 31.4 0.423
1990 0.63 0.24 35.2 0.378 2.00 0.40 24.7 0.200
1991 1.68 0.57 31.5 0.341 2.08 0.54 29.2 0.258
1992 1.26 0.48 34.8 0.383 0.94 0.24 29.5 0.254
1993 1.47 0.36 30.3 0.245 5.15 0.54 17.0 0.105
1994 3.13 0.53 27.4 0.170 2.21 0.42 24.9 0.191
1995 1.88 0.47 30.6 0.248 4.74 0.62 25.7 0.132
1996 1.36 0.28 30.5 0.204 5.38 1.02 29.7 0.189
1997 2.22 0.43 31.0 0.195 5.11 0.77 24.9 0.150
1998 4.27 0.77 29.0 0.179 3.70 0.47 24.2 0.127
1999 3.15 0.48 28.1 0.153 5.92 0.88 26.3 0.148
2000 3.45 0.52 27.3 0.151 6.63 1.11 27.1 0.167
2001 4.41 0.75 29.5 0.171 7.94 1.71 32.3 0.216
2002 8.10 1.62 31.4 0.199 4.31 1.06 33.2 0.247
2003 5.20 1.30 34.2 0.250
Note: During 1963-1984, BMV oval doors were used in the spring and autumn surveys; since 1985, Portuguese polyvalent doors have been used in both surveys. No significant differences in catchability were found for witch flounder, therefore no adjustments have been made (Byrne and Forrester, MS 1991). No significant differences were found between research vessels, and no adjustment have been made (Byrne and Forrester, MS 1991).
Spring surveys during 1973-1981 were accomplished with a 41 Yankee trawl; in all other years, a 36 Yankee trawl was used. No adjustments have been made.

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 (Modified Jun. 13 2008)