The Steel head trout breeds in fresh water. The area in our vicinity where this used to happen is the Alameda creek. The Alameda creek runs for 45 miles through Niles canyon and Sunol valley, bisecting Santa Clara and Alameda counties before flowing downstream to the San Francisco bay. Today one hardly sees any trout in this creek. There are two main causes for the decline of the trout population. The first challenge the trout face is their run to ideal spawning grounds. A run is the path the trout take to reach their spawning grounds. The spawning season runs from January to April. During this time trout swim upstream, and lay their eggs in gravel beds. The fry, which are baby trout, then flow downstream, often along the same path as their parents to reach the bay. Along their run however the trout face many obstacle, mainly made and debris this handicaps the trout both in their ability to swim freely and to find suitable spawning and rearing habitat. Concrete barriers, such as reservoirs are one form of an obstacle. In other instances trout that try to make
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This note was uploaded on 01/23/2012 for the course BIOL 101 taught by Professor Lexicon during the Spring '11 term at Ohlone.