Pickerel. Besides the common, fishermen distinguish the brook, or grass pickerel, which bites differently, and has a shorter snout. Those caught in Walden, hard by my house, are easily distinguished from those caught in the river, being much heavier in proportion to their size, stouter, firmer-fleshed, and lighter-colored. The little pickerel which I sent last, jumped into the boat in its fright.
Pouts. Those in the pond are of different appearance from those that I have sent.
Breams. Some more green, others more brown.
Suckers. The horned, which I sent first, and the black. I am not sure whether the common or Boston sucker is found here. Are the three which I sent last, which were speared in the river, identical with the three black suckers, taken by hand in the brook, which I sent before? I have never examined them minutely.
Perch. The river perch, of which I sent five specimens in the box, are darker-colored than those found in the pond. There are myriads of small ones in the latter place, and but few large ones. I have counted ten transverse bands on some of the smaller.
Lampreys. Very scarce since the dams at Lowell and Billerica were built.
Shiners. Leuciscus chrysoleucus, silver and golden. What is the difference?
Roach or Chiverin (Leuciscus pulchellus, argenteus, or what not). The white and the red. The former described by Storer, but the latter, which deserves distinct notice, not described, to my knowledge. Are the minnows (called here dace), of which I sent three live specimens, I believe, one larger and two smaller, the young of this species?
Trout. Of different appearance in different brooks in this neighborhood.
Eels.