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For northern pike, b = 3.096 and c = 0.000180 (c = 7.089 enables one to put length in meters and weight in kilograms). [11] The relationship described in this section suggests a 50-centimetre (20 in) northern pike will weigh about 0.9 kg (2 lb), while a 65-centimetre (26 in) northern pike will weigh about 1.8 kg (4 lb).
The former's fins have dark leading edges and amber to dusky coloration. In addition, the light areas between the dark bands are generally wider on the grass pickerel and narrower on the redfin pickerel. Record size grass and redfin pickerels can weigh around 2 pounds (0.91 kg) [3] and reach lengths of around 13 inches (33 cm). [4]
Its body outline resembles that of the northern pike (E. lucius). Unlike northern pike, however, the opercles and cheeks of chain pickerel are entirely scaled. [5] It may reach up to 78.7 centimetres (31.0 in) long only on rare occasions. [8] The average size for chain pickerel, however, is 24 in (61 cm) and 3 lb (1 1/2 kg).
Family Petromyzontidae (northern lampreys) Western brook lamprey. Vancouver lamprey ... Northern pike (Esox lucius) Muskellunge (Esox masquinongy) Chain pickerel ...
Aristotle (ca. 340 B.C.) may have been the first scientist to speculate on the use of hard parts of fishes to determine age, stating in Historica Animalium that “the age of a scaly fish may be told by the size and hardness of its scales.” [4] However, it was not until the development of the microscope that more detailed studies were performed on the structure of scales. [5]
A young E. lucius specimen — a "chain pickerel" in the original sense — in an aquarium.. The generic name Esox (pike fish) derives from the Greek ἴσοξ (ee-soks, a large fish) and appears to be cognate with Celtic, Welsh eog and Irish Gaelic iasc (fish), as well as alpine Gaulic *esosk which is consistent with the original indoeuropean root for the common word for fish, *pei(k)sk.
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Esox cisalpinus was distinguished from Esox lucius (northern pike) and described scientifically as a new species in 2011 independently by two research groups. The description by Bianco & Delmastro was printed earlier, [4] and the name Esox cisalpinus is therefore accepted, whereas the alternative name published somewhat later by Lucentini et al., Esox flaviae, is considered a junior synonym.