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Variation in length, girth and weight of large northern pikes (Esox lucius) in Finland

The relationship between total length (L, cm) and weight (W, kg) in the large northern pike (Esox lucius) was investigated using a dataset comprising 802 specimens weighing between 1 and 18.8 kg caught during fishing competitions. The applying the data to the equation W = aLb, yielded a = 6.648 × 10...

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Bibliographic Details
Published in:Annales zoologici fennici 2014, Vol.51 (3), p.335-339
Main Authors: Milardi, Marco, &, Jyrki Lappalainen, Juntunen, Teppo
Format: Article
Language:English
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Summary:The relationship between total length (L, cm) and weight (W, kg) in the large northern pike (Esox lucius) was investigated using a dataset comprising 802 specimens weighing between 1 and 18.8 kg caught during fishing competitions. The applying the data to the equation W = aLb, yielded a = 6.648 × 10-6 and b = 3.0217. Weight residuals fluctuate during the fishing season, likely due to conditions of the fish, probably associated with gonad development. Additionally, the equations including maximum girth (G, cm) — W = aGb and W = a(L × G)b — were fitted using a subset of record fish totalling 186 specimens. Comparison of the equations W = aLb and W = aGb showed that weight was better described by maximum girth (AIC = 624.9) rather than by length (AIC = 690.0), but the best fit was obtained with the equation W = a(L × G)b (AIC = 566.3) with the parameters a = 2.426 × 10-3 and b = 0.974.
ISSN:0003-455X
1797-2450
DOI:10.5735/086.051.0305