Evolution Of The Declining Salmon Populations

1672 WordsMay 21, 20167 Pages
Researchers believe that the declining salmon populations are mainly the result of the four H’s, harvesting habits, hydropower, habitat loss, and hatchery fish (Ruckelshaus et al., 2002, pp. 679). Harvesting habits refers to the impact overfishing has on the salon populations (Ruckelshaus et al., 2002, pp. 679). Every year, around 385,000 metric tons of Pacific salmon are caught by commercial fisherman and with weak stock conditions, the natural life cycle of these fish cannot keep up (Knapp, 2007). Hydropower refers to the dams that currently block many rivers in the Pacific Northwest that prevent salmon from reaching or returning from their native spawning grounds (Gore and Doerr, 2000, pp. 40-41). This means that salmon cannot breed as much as they used to and stocks that are now blocked from migrating by dams are doomed to decline. Habitat loss is detrimental use and pollution of the areas surrounding salmon migrations (Ruckelshaus et al., 2002, pp. 679-680). This includes, urban growth, industrialization, deforestation, unplanned farming and pollution, especially runoff and other waste. Hatchery fish refer to the farm-grown fish that escape the hatcheries and breed with the wild stock (Gore and Doerr, 2000, pp. 40-41). This generally weakens the wild stock since the hatchery fish have been modified for their meat at the cost of their survival traits. Generally, the solutions for these problems have been split along two different areas. This first is the environmental
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