. Handbook of nature-study for teachers and parents, based on the Cornell nature-study leaflets. Nature study. Fish Study i6S is reddish, in others whitish. All the fins on the lower side of the body have the front edges ereamy or yellowish white, with a darker streak behind. The trout's head is quite large and somewhat blunt. The large eye is a little in front of the middle of the head. The dorsal fin is at about the middle of the body, and when raised is squarish in outline. Behind the dorsal fin, and near to the tail is the little, fleshy adipose fin, so called beeause it has no rays. The t
. Handbook of nature-study for teachers and parents, based on the Cornell nature-study leaflets. Nature study. Fish Study i6S is reddish, in others whitish. All the fins on the lower side of the body have the front edges ereamy or yellowish white, with a darker streak behind. The trout's head is quite large and somewhat blunt. The large eye is a little in front of the middle of the head. The dorsal fin is at about the middle of the body, and when raised is squarish in outline. Behind the dorsal fin, and near to the tail is the little, fleshy adipose fin, so called beeause it has no rays. The tail is fan-shaped, slightly notched at the end . and is large and strong. The anal fin is rather large, being shaped much like the dorsal fin, only slightly smaller. The ventral fins are directly below the dorsal fin and a little behind its middle. The pectorals are lo w down, being below and just behind the gill Where the trout hide. In size the brook trout seldom is longer than seven or eight inches, but in the rivers of the Northeastern United States specimens weighing from six to eleven pounds are sometimes taken. It does not floiuish in water which is warmer than 68°, but prefers a temperature of about 50°. It must have the pure water of mountain streams and cannot endure water of rivers which is polluted by mills or the refuse of cities. Where it has access to streams that flow into the ocean, it forms the salt water habit, going out to sea and remaining there during the winter. Such specimens become very large. The trout can lay eggs when about six inches in length. The eggs are laid from September until late November, although, as Mr. Bream says, the brook trout are spawned at some locality in almost every month of the year except mid-summer. One mother trout lays from 400 to 600 eggs, but the large-sized ones lay more. The period of hatching depends upon the temperature of the water. In depositing their eggs the trout seek water with gravelly bottom, often w
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