In small streams, sexually mature fish may be only four or five inches long, and produce only a few hundred eggs.Ī Brook Trout over 18 inches might produce around 4,000 eggs. Eggs develop over the winter and hatch in late winter or early spring. The eggs are given no further parental care. After fertilization, the eggs receive a small additional covering of gravel, often from females digging new areas just upstream. The males become aggressive on the spawning grounds, chasing one another, but several males may accompany the female in the spawning act. Similar to other trout, with violent motion of the body and tail, the female digs a shallow nest depression in the bottom gravel (a "redd") where there is good water flow to bring oxygen to the eggs. Brook Trout spawn in the fall, from mid-September through November and may travel to upstream headwaters to find the right spawning spot.
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