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Length-Weight Parameters for Trachurus trachurus
Length-weight (log a vs b) graph
    [n=53]
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a b Country Locality
Score a b Doubtful? Sex Length (cm) Length
type 		r2 SD b SD log10 a n Country Locality
0.02690 2.633   unsexed 13.4 - 43.1 TL  0.771      441  Portugal off western coast (Nazaré to St André, 1997, Póvoado Varzim to Figueira da Foz, 1994) 
0.01770 2.757   Female 15.5 - 42.5 TL  0.883      5093  North Sea / 1998-2008 
0.01450 2.770   unsexed 3.9 - 21.6 TL  0.994      119  Spain Balearic Islands, 1995-96 
0.01660 2.774   Male 12.5 - 45.5 TL  0.895      4711  North Sea / 2002-2008 
0.01560 2.785   male 13.4 - 21.4 TL  0.893  0.981   81  Turkey Gökceada Island (northern Aegean Sea), 2004-2011 
0.01870 2.790   unsexed     FL          South Africa  
0.01700 2.800 yes  juvenile 7.4 - 21.5 TL  0.874      38  Egypt off Alexandria, 1998 
0.01440 2.814   female 13.4 - 24.3 TL  0.874  1.076   123  Turkey Gökceada Island (northern Aegean Sea), 2004-2010 
0.01650 2.823   unsexed 4.5 - 40.5 TL  0.962      491  North Sea / (July) 1994-2006 
0.01370 2.826   unsexed 7.5 - 36.5 TL  0.948      928  North Sea / (November) 1994-2006 
0.01340 2.841   mixed 6.4 - 33.2 TL  0.980      476  Spain Gulf of Cadiz, 2009-11 
0.01270 2.851   unsexed 16.0 - 40.2 TL  0.960  0.570   25  Portugal South coast, 1994-95 
0.01120 2.882   unsexed 2.5 - 41.5 TL  0.979      3815  North Sea / 1994-2008 
0.01072 2.888   unsexed 6.8 - 33.9 TL  0.941      264  Portugal Algarve, 1996-97 
0.01130 2.897   mixed 10.5 - 24.3 TL  0.918  0.861   264  Turkey Gökceada Island (northern Aegean Sea), 2004-2009 
0.01240 2.903   unsexed     TL          South Africa Stompneus Bay (33°S 18°E), 1950-71 
0.01250 2.908   unsexed 4.5 - 41.5 TL  0.988      886  North Sea / (Quarter 3) 1994-2007 
0.01210 2.918   mixed 14.0 - 35.0           France Mediterranean waters 
0.01120 2.929   unsexed 4.5 - 39.5 TL  0.991      56  North Sea / (September) 1997-2006 
0.01180 2.931   unsexed 4.5 - 41.5 TL  0.993      350  North Sea / (August) 1995-2006 
0.00950 2.947   Female 11.5 - 18.3 TL  0.940  0.037   358  Turkey Central Black Sea, 2004-2005 
0.00950 2.947   female 11.5 - 18.3 TL  0.940  0.700   358  Turkey middle Black Sea / 2004-2005. 
0.00820 2.956   unsexed 12.5 - 40.5 TL  0.920      1981  North Sea / (April) 1998-2007 
0.00990 2.972   unsexed 21.5 - 39.5 TL  0.918      37  North Sea / (May) 1994-2005 
0.00860 2.978   unsexed 7.5 - 37.5 TL  0.973      336  North Sea / (December) 1994-2006 
0.00860 2.985   mixed 7.3 - 18.3 TL  0.960  0.629   747  Turkey middle Black Sea / 2004-2005. 
0.00860 2.985 yes  juvenile 7.3 - 18.3 TL  0.960  0.023   747  Turkey Central Black Sea, 2004-2005 
0.00730 2.995   unsexed 15.5 - 40.5 TL  0.933      769  North Sea / (March) 1994-2007 
0.01270 3.000   male               Algeria Bou-Ismail 
0.01500 3.000   female               Algeria Bou-Ismail 
0.00790 3.013   Male 10.3 - 17.8 TL  0.960  0.035   383  Turkey Central Black Sea, 2004-2005 
0.00790 3.013   male 10.3 - 17.8 TL  0.960  0.685   383  Turkey middle Black Sea / 2004-2005. 
0.00780 3.016   unsexed 12.6 - 43.3 TL  0.982  0.410   583  Portugal Algarve coast, Portugal / 1998-00 
0.00680 3.017   unsexed 12.5 - 40.5 TL  0.914      2030  North Sea / (Quarter 2) 1994-2007 
0.00720 3.017   unsexed 6.5 - 46.5 TL  0.977      3388  North Sea / (Quarter 1) 1994-2008 
0.00790 3.020   unsexed 7.5 - 40.5 TL  0.939      4711  North Sea / (Quarter 4) 1994-2006 
0.00730 3.028   unsexed 6.5 - 38.5 TL  0.991      330  North Sea / (January) 1994-2008 
0.01000 3.030   unsexed               Mauritania  
0.00719 3.033   unsexed 7.0 - 44.0 TL  1.000      4840  France Bay of Biscay 
0.00670 3.040   mixed 7.0 - 34.0 TL  0.977      715  Greece G. Saronikos, 1990 
0.00650 3.050   unsexed 10.5 - 46.5 TL  0.971      2289  North Sea / (February) 1995-2008 
0.00610 3.070   mixed 6.5 - 33.9 TL  0.968      1193  Greece G. Saronikos, 1990 
0.00670 3.082   unsexed 14.5 - 40.5 TL  0.939      3447  North Sea / (October) 2001-2005 
0.00600 3.110   unsexed 16.0 - 30.2 TL  0.930  0.862   367  Greece North Aegean Sea, 2004-05 
0.00560 3.128 yes  juvenile 8.0 - 16.4 TL  0.918  0.054   307  Turkey northern Sea of Marmara, 2006-2007 (Nov.-Mar.) 
0.00490 3.140   unsexed               Mauritania  
0.00440 3.190   male     TL          Netherlands southern North Sea 
0.00400 3.249 yes  juvenile 6.0 - 15.7 TL  0.946  0.768   267  Turkey Eastern Black Sea, 2007 
0.00339 3.273   mixed 15.8 - 28.0 TL  0.960      12  Greece Kyclades, 1997-98 
0.00320 3.290   female     TL          Netherlands southern North Sea 
0.00340 3.294   unsexed 16.0 - 41.0 TL        283  UK Scotland North Sea & West Coast of Scotland, 1977-84 
0.00431 3.333   mixed 10.5 - 22.6 FL  0.960      61  Greece G. S. Evvoikos, 1992-93 
0.00210 3.427   unsexed 21.5 - 39.5 TL  0.975      14  North Sea / (June) 1994-2005 
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Preliminary parameter estimates are provided below, based on your selection of studies and weighted by the scores.
You may want to exclude or give less weight to studies that are far from the regression line in the graph.
Selected studies = 49, geometric mean a = 0.0089, mean b = 2.98, SD log10(W) = 0.0592, SD log10(a) = 0.2124 SD b = 0.1552
Estimate weight for given length: (cm) = (g) 95% range - (g)
Search for more references on length-weight:    Scirus
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Last modified by d.santos 05/08/14