Esox nobilior. The Mascalonge. Body elongate; head 3-2/3; depth 6; eye 5; B. 17 to 19; D. 17; A. 15; scales 150 along the lateral line; cheeks and opercles naked below, scaly above; in about 8 rows.
Esox lucius. The Pike. Body elongate; head 3-1/3; depth 5; eye 6; B. 14 to 16; D. 16 or 17; A. 13 or 14; scales 125; cheeks entirely covered with scales; lower half of opercles naked, upper half with scales.
Esox reticulatus. Eastern Pickerel. Body elongate; head 3-1/2; depth 6; eye 8; B. 14 to 16; D. 14; A. 13; scales 125; cheeks and opercles entirely covered with scales.
Esox vermiculatus. The Western Pickerel. Body elongate; head 3-1/4; depth 5 to 6; eye 6; B. 12; D. 11 or 12; A. 11 or 12; scales 105 along the lateral line; cheeks and opercles entirely covered with scales.
Esox americanus. The Banded Pickerel. Body elongate; head 3-1/2; depth 5-1/2; eye 5; B. 12 or 13; D. 11 or 12; A. 11 or 12; scales 105; cheeks and opercles entirely covered with scales.
As some anglers find it difficult to distinguish a large pike from a mascalonge, or a pike from a pickerel, owing to the similar shape and appearance, the several species can be easily identified by means of the following artificial key:
The mascalonge (Esox nobilior) has the upper part of both the cheeks and gill-covers scaly, while the lower half of both cheeks and gill-covers is naked; it has from 17 to 19 branchiostegal rays (the branchiostegals are the rays on the under side of the gill-cover, that, like the ribs of an umbrella, assist in opening and closing it during breathing). Its coloration is of a uniform grayish hue, or when marked with spots or bars they are always of a much darker color or shade than the ground color.
The pike (Esox lucius)has the cheeks entirely scaly, but only the upper part of the gill-cover, the lower half being naked; it has from 14 to 16 branchiostegal rays; its coloration is a bluish or greenish gray, with elongated or bean-shaped spots covering the sides, and which are always of a lighter hue than the ground color.
The eastern or reticulated pickerel (Esox reticulatus) has both the cheeks and the gill-covers entirely covered with scales; it has from 14 to 16 branchiostegal rays; its coloration is shades of green, with sides of golden lustre, and marked with dark reticulations, mostly horizontal. It is rarely or never found west of the Alleghanies.
The little western pickerel (Esox vermiculatus) has both cheeks and gill-covers entirely scaly, as have all the pickerels; it has from 11 to 13, usually 12, branchiostegal rays; its coloration is greenish or grayish, with curved streaks on the sides forming bars or reticulations; the color is quite variable, sometimes plain olive. It is found only west of the Alleghanies.
The banded or American pickerel (Esox americanus) has, like the other true pickerels, both the cheeks and the gill-covers entirely covered with scales; it has 12 or 13 branchiostegal rays; coloration dark green, sides with many distinct black curved transverse bars; a black bar below the eye, and one from the snout through the eye to the gill-cover. It is found only east of the Alleghanies.
THE MASCALONGE
(Esox nobilior)
The specific name nobilior, long current for the mascalonge, and the one based on its earliest accurate description, was conferred by Rev. Zadoc Thompson in 1849 in "Notes on Certain Vermont Fishes," in the Proceedings of the Boston Society of Natural History, Vol. III, published July 18, 1849, and later he described it fully in the "History of Vermont," 1853, Part I. It is an excellent and appropriate name, and one that has become familiar to anglers. I have retained it, inasmuch as it was discarded, I think, for a very insufficient reason.
The specific name masquinongy, which has recently been given to this species in the books, is supposed to have been given to the mascalonge by Dr. Mitchill in 1824. His description, however, cannot now be found. It is alluded to by De Kay in his "Fishes of New York," in 1842, who gives its reference as "Mirror, 1824, page 297"; but I have searched for it in vain, as have others. De Kay merely says: "According to Mitchill, who describes a specimen 47.0 long and weighing thirty pounds, the fin rays are as follows: 'D. 21; P. 14; V. 11; A. 17; C. 26.' But this radial formula is just as applicable to Richardson's E. lucius: 'D. 20; P. 16; A. 18,' also given by De Kay. The size and weight of the alleged specimen of Mitchill would seem to indicate the mascalonge, but the great northern pickerel, Esox lucius, occasionally reaches a like size and weight. I once caught one weighing twenty-five pounds in northern Wisconsin, and saw several a little heavier, one of fully twenty-eight pounds."