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首页> 外文期刊>The Progressive Fish-Culturist >HISTORY AND FLUCTUATING ASYMMETRY OF UTAH SALMONID BROODSTOCKS
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HISTORY AND FLUCTUATING ASYMMETRY OF UTAH SALMONID BROODSTOCKS

机译：犹他鲑鱼种群的历史和动荡不对称

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摘要

The level of potential inbreeding in Utah salmonid broodstocks was assessed by fluctuating asymmetry (FA) of five bilateral meristic characters. Counts were made of the following characters on the left and right sides of 40 fish: gill rakers on the lower first branchial arch, gill rakers on the upper first branchial arch, mandibular pores, pectoral fin rays, and pelvic fin rays. Data from state hatchery records for the last 20 years were examined for trends in development to the eyed stage, percent hatch, and percent cripples (deformity). A brief history of Utah broodstocks is also presented. The mean FA for each of the strains of five species varied from 1.25 (Sand Creek strain rainbow trout Oncorhynchus mykiss) to 3.15 (Bonneville cutthroat trout O. clarki utah), with no consistent differences among species. The meristic counts were variable, and the overlap made differentiation among strains and species based upon these counts impossible. From 1972 to 1993, percent survival to the eyed egg stage for most Utah hatchery strains did not follow any trend, except for brook trout Salvelinus fontinalis (r = -0.712) and albino rainbow trout (r = 0.457). Eggs stripped from wild stocks of lake trout S. namaycush and kokanee (lacustrine sockeye salmon O. nerka) had significantly lower survival to the eyed stage and hatching success than eggs from hatchery broodstocks, except for brook trout and albino rainbow trout. Mean crippling rates ranged from 1.5% in kokanee to 6.6% in Strawberry Reservoir cutthroat trout O. clarki. Fluctuating-asymmetry, eye-up, hatching, and deformity data indicated either low or no inbreeding in Utah broodstocks.
机译：犹他州鲑科亲鱼的近亲繁殖潜能水平是通过五个双边有利特征的不对称波动（FA）进行评估的。在40条鱼的左侧和右侧，按以下字符进行计数：第一first弓下部的g耙，第一first弓上部的耙，下颌毛孔，胸鳍射线和骨盆鳍射线。检查了过去20年的州孵化场记录中的数据，以了解到目测阶段的发展趋势，孵化率和残废率（畸形）。还介绍了犹他州亲鱼的简要历史。五个物种的每个菌株的平均FA从1.25（沙溪菌株虹鳟Oncorhynchus mykiss）到3.15（Bonneville ville喉鳟O. clarki utah）不等，物种之间没有一致的差异。优点计数是可变的，并且重叠使得基于这些计数的菌株和物种之间的区分是不可能的。从1972年到1993年，除了溪鳟Salvelinus fontinalis（r = -0.712）和白化虹鳟（r = 0.457）以外，大多数犹他州孵化场菌株的有眼卵期存活率没有任何趋势。从湖鳟S. namaycush和kokanee（湖鲈红鲑O. nerka）的野生种群中剥离的卵，到网眼阶段和孵化成功率要比孵化亲鱼的卵低得多，除了溪鳟和白化虹鳟。平均残废率从kokanee的1.5％到草莓水库残酷的鳟鱼O. clarki的6.6％不等。波动不对称，抬头，孵化和畸形的数据表明，在犹他州亲鱼中近亲繁殖很少或没有近亲繁殖。

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