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首页> 外文期刊>North American Journal of Fisheries Management >Dynamics of an Introduced and Unexploited Lake Whitefish Population in Lake Pend Oreille, Idaho
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Dynamics of an Introduced and Unexploited Lake Whitefish Population in Lake Pend Oreille, Idaho

机译：爱达荷州Pend Oreille湖中未引进的白鲑湖种群的动态

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摘要

To evaluate biological potential of a commercial fishery for an unexploited Lake Whitefish Coregonus clupeaformis population in Lake Pend Oreille, Idaho, we estimated population parameters related to production and yield. The length frequency based on trap-netting in autumn 2005 was normal with a mean of 448 mm TL, whereas the length frequency based on gillnetting in spring 2006 was bimodal with a mean of 390 mm TL. Sex composition was skewed toward females (0.66) during autumn trap-netting. Shape parameters beta of weight-length models for females (beta = 3.38) and males (beta = 3.45) were similar to those of other unexploited populations. Instantaneous growth rates K for females (K = 0.144 per year) andmales (K = 0.153 per year) were among the lowest for unexploited populations across the species' range. Age at 50% maturity (females: 6.5 years; males: 6.0 years) and length at 50% maturity (females: 390 mm TL; males: 378 mm TL) were high for unexploited populations. The natural mortality rate M (0.149 per year, ages 11-36) was among the lowest observed for unexploited populations. Adult population density was lower than that of other populations based on total surface area (mean = 1.35 fish/ha; 95% confidence interval [CI] = 1.11-1.78 fish/ha) but was average based on lake area shallower than 70 m (4.07 fish/ha; 95% CI = 3.35-5.35 fish/ha). Population density of juveniles and adults averaged 84 fish/ha (95% CI = 52-143 fish/ha) over the entire surface area and 278 fish/ha (95% CI = 173-474 fish/ha) over depths shallower than 70 m. The difference between the low M of the unexploited population in Lake Pend Oreille (M = 0.149 per year; annual mortality rate A = 14%) and the high sustainable total mortality Z of exploited stocks in the Laurentian Great Lakes (Z = 1.204; A = 70%) suggests a large scope for sustainable fishingmortality F (1.055 per year; exploitation rate u = 61%) that is equivalent to a sustainable Lake Whitefish harvest of 55,000 individuals (50,000-60,000 individuals) and 49,000 kg (45,000-54,000 kg) from Lake Pend Oreille.
机译：为了评估爱达荷州彭德奥雷里湖未开发的白鲑金枪鱼clupeaformis种群商业渔业的生物潜力，我们估计了与产量和产量相关的种群参数。 2005年秋季基于陷阱网的长度频率是正常的，平均值为448 mm TL，而2006年春季基于刺网的长度频率是双峰的，平均值为390 mm TL。在秋季诱捕网中，性别组成偏向女性（0.66）。雌性（β= 3.38）和雄性（β= 3.45）体重模型的形状参数β与其他未利用人群的相似。在整个物种范围内，未利用种群的雌性（K =每年0.144）和雄性（K =每年0.153）的瞬时增长率K最低。对于未开发种群，年龄为50％的年龄（女性：6.5岁;男性：6.0岁）和年龄为50％的长度（女性：390 mm TL;男性：378 mm TL）较高。自然死亡率M（每年0.149，11-36岁）是未开发人群中观察到的最低死亡率之一。以总表面积计（平均= 1.35条鱼/公顷; 95％置信区间[CI] = 1.1-1.78条鱼/公顷），成虫的种群密度低于其他种群，但以浅于70 m的湖泊面积为平均（ 4.07鱼/公顷; 95％CI = 3.35-5.35鱼/公顷）。在整个表面积上，未成年和成年种群的平均密度为84鱼类/公顷（95％CI = 52-143鱼类/公顷），在小于70的深度处平均为278鱼类/公顷（95％CI = 173-474鱼类/公顷）。米Pend Oreille湖未开发种群的低M（每年M = 0.149;年死亡率A = 14％）与Laurentian大湖地区已开发种群的高可持续总死亡率Z之差（Z = 1.204; A = 70％）表示可持续捕捞死亡率F的较大范围（每年1.055;剥削率u = 61％），相当于55,000个人（50,000-60,000个人）和49,000公斤（45,000-54,000公斤）的可持续白鲑湖捕捞量）（来自彭德湖）。

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