【130603】❤EFY❤【阅读阅开心】No.139

绝望罗勒 (布丁小葵) 资深达人
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发表于:2013-06-03 20:45 [只看楼主] [划词开启]

 

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        In Yellowstone, bald eagles, ospreys,pelicans, otters, grizzly bears, and other wildlife take precedence over humansin utilizing fish as food. None of the fish in Yellowstone are stocked, andpopulations depend on sufficient number of spawning adults to maintain naturalreproduction and genetic diversity. In Yellowstone National Park, we place lessemphasis upon providing fishing for human consumption and put more emphasisupon the quality for recreational fishing. Anglers, in return, have theopportunity to fish for wild trout in a natural setting.

 

        Because of the increasing number ofanglers in the park, more restrictive regulations have been adopted inYellowstone. These restrictions include: season opening / closing dates,restrictive use of bit, catch-and-release only areas, and number / size limitsaccording to species. A few places are closed to the public to protect threatenedand endangered species, sensitive nesting birds, and to provide scenic viewingareas for visitors seeking undisturbed wildlife.

 

        As of the summer of 2001, all nativesport fish species in Yellowstone National Park became subject to catch-and-release-onlyfishing rules. The native species affected by this change are the cutthroattrout and its several subspecies, Montana grayling, and mountain whitefish. Mostof the park’s native fishes have been included under catch-release-only fishingrules since the early 1970’s. the changes effective in 2001 primarily affectpopulations in Yellowstone Lake, its tributaries, and the upper Lamar River.

 

        Due to evidence that invasive introducedorganisms such as lake trout, whirling disease, and New Zealand mud snails are havingnegative effects on Yellowstone’s native sport fish, the 2001 changes seem tobe the next logical step to help repair the tremendous damage being done to thenative species.

 

        Yellowstone cutthroat trout havedeclined throughout the west and are currently designated as a “Species of SpecialConcern-Class A” by the American Fisheries Society. A formal petition to listthis subspecies as “threatened” throughout its range was submitted to the U.S.Fish and Wildlife Service in 1998. Yellowstone National Park representsapproximately 91% of the current range of Yellowstone cutthroat trout andcontains 85 % of the historical lake habitat for this subspecies, so the parkis considered crucial to the survival of the species.

 

        In addition to thecatch-and-release-only fishing rules, the opening date of the fishing season onYellowstone Lake returned to its historical date of June 15 for the 2001fishing season. From 1998 through 2000, Yellowstone Lake’s opening date wasmoved forward to June 1 in an attempt to give anglers a greater chance ofcatching nonnative lake trout, but monitoring showed that during the early Juneperiod, anglers caught several thousand cutthroat trout for every lake troutcaught. Because of incidental hooking mortality of released fish, this negatesthe positive impact of the angler catch of lake trout.

 

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答题区

1、In Yellowstone, as far as fish is concerned, ______
2、From 1998 through 2000, Yellowstone Lake changed its opening date to June 1 to protect the native trout. The author thinks....
3、Which of the following is NOT included in the more restrctive regulations adopted to protect fish in the park:
4、As for the summer of 2001, Yellowstone National Park enforces catch-and-release-only fishing rules....
最后编辑于:2013-06-05 09:34

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