The effects that man has had on the Chinook salmon and many other species of salmon is very severe, any are labeled as threatened. Stewart Grant, Richard Branner, and Toshihide Hamazaki authored a paper released in June detailing a gradual and inexplicable decline in 10 Alaska chinook salmon stock sizes from the s throughdue to an array of factors from ocean current patterns to size-selective harvest methods.
Thousands of years ago, Native Americans along the Pacific and Atlantic coasts of North America were building societies that revolved around the salmon. I remember when I was around 6 years old, my dad hooked a 27 pound Chinook.
However, when catching the salmon, fisherman use pound nets to catch the fish on their way to their spawning grounds. The decline in size-at-maturity and overall size has implications for the overall health of chinook. Kings spend a year in the river before heading out to the ocean, where they typically spend between two and five winters before heading back to their spawning grounds.
The Atlantic salmon situation in the United States is also severe. Others are designed to circle around a school of fish and then is drawn shut. This is a picture of me when I was 6 years old with a 27 lb Chinook salmon One fish, two fish, someday NO FISH During the interview with my dad Steve, I asked him what he thought was causing this decrease in size and population numbers in Chinook salmon.
Many of them are killed by the giant turbines on their way back to the ocean. The rights to these fishing grounds were passed down from generation to generation. Today, it is estimated that only 50 to native Atlantic salmon will return to a half dozen rivers in eastern Maine.
Majoring in a Bachelors of Science in General Biology, she has a deep fascination for the world around her. The chemicals are dumped into the rivers and streams and eventually these chemicals find their way to the ocean, polluting and affecting each area they pass through.
Hydropower is a very good alternative resource for power, however it is very damaging to our salmon populations. I thank my dad for that. Because the salmon migrated on a cyclic basis, so too did the Native peoples whose lives revolved around the fish.
Man has been the main cause for the decline in Chinook salmon populations. The populations of Chinook salmon have declined for several reasons. The Puget Sound had really good fishing back then. In all 10 of the examined stocks, the percentage of four-ocean fish declined; bytwo- and three-ocean king salmon were the dominant spawners.
My father would take me and my siblings out fishing on Puget Sound to catch Chinook salmon. Fish ladders are one method of helping migrating fish ascend rivers blocked by dams. On the west coast, it is widely accepted that the most important factors that affect salmon are the "four Hs"—hydropower, habitat, harvest, and hatcheries.
Now only one or two fish may be observed reaching their annual destination. Though some small dams are being removed, any proposal for the removal of the large hydroelectric dams on the Columbia River system will be hotly contested for years into the future.
It brings together government, interest groups, and private citizens from all sectors of the state. The study finds correlations between size decline and a host of factors, but not direct causative links.
Habitat loss to urban growth and degraded watersheds from generations of farming and logging has left spawning grounds choked with pollutants and silt. Some wheels were mounted on the backs of boats, making them mobile fish scoopers.
In the Pacific Northwest, making changes that affect any of the four Hs is challenging because each has a powerful constituency that tries to protect its own interest. Environmental factors also play a large, if unquantifiable, role. They plan to improve migration conditions, by increasing the area around the dams so that the salmon can get through.
Juvenile fish transportation programs represent only a small component of the larger strategy to assist the recovery of salmon populations.The spring run of chinook was, at one time, the dominant run in the Klamath River basin (Myers et al ).
The Shasta, Scott, and Salmon rivers all provided for large runs.
The Mokelumne River is one of the major salmon producing rivers for fall-run Chinook salmon in California. Throughout the Central Valley rivers, returning fall-run Chinook salmon numbers have rebounded since a disastrous year inwhich led to the unprecedented closure of the commercial salmon fishing season for consecutive years.
The total human population that relied on the salmon supply of the lower Columbia River is believed to have been approximatelypeople. Fish ladders are one method of helping migrating fish ascend rivers blocked by dams. I can take some of this knowledge and apply it to some possible reasons why we are seeing a decrease in size and population of Chinook salmon: 1.
Chinook are decreasing in size due to increased fishing and predation pressure. Lynda Mapes brought up a few interesting points during her visit. Jun 20, · Changes in numbers of seals since the s were associated with a 74% decrease (95% CI: 85%, %) in maximum sustainable yield in Chinook stocks.
In contrast, hatchery releases were significantly correlated with Chinook productivity in only one of 20 populations. The iconic Alaska chinook salmon has unequaled world-renown for big fish tales. The largest fish on record, a pounder pulled from the Kenai River inchanged the focus of the Alaska fishing economy, bringing in waves of fish tourists and seeding the politically influential guided angler industry.Download