Inferences based on tagged individuals from a population are limited in part by the minimum size of fish that can be tagged. Smaller tags allow a greater proportion of a population to be represented by tagging and should reduce potential tag effects on fish performance. We evaluated different performance metrics of juvenile fall Chinook Salmon Oncorhynchus tshawytscha tagged with 8‐, 9‐, and 12‐mm PIT tags in the Snake River. We did not find evidence that posttagging mortality of 45–49‐mm‐FL fish tagged with 8‐mm tags was higher than the posttagging mortality of larger fish tagged with 9‐ and 12‐mm tags. The incisions of fish tagged with 8‐mm tags using 14‐guage needles healed faster than those of fish tagged with larger tags using 12‐guage needles. For individuals that received 8‐mm tags, growth in length and mass was higher for 45–49‐mm fish than for 50–59‐mm fish and 60‐mm and larger fish. Growth of the larger size‐classes (50–59 and ≥60 mm) was also generally higher for those tagged with 8‐mm tags compared to those tagged with 9‐ and 12‐mm tags, respectively. There were no strong relationships between tag burden (i.e., tag weight expressed as a percentage of fish weight) at the time of tagging and growth metrics for any tag size or fish size‐class. Releases made to compare the detection efficiency of the three tag types in the juvenile fish bypass at Lower Granite Dam, Washington, showed that 99–100% of all fish were detected. Survival of fish from rearing areas to Lower Granite Dam generally increased with fish size and varied by year, but there was no strong evidence of a tag size effect. The 8‐mm PIT tag allowed us to represent a larger portion (i.e., 6.2–24.1%) of the subyearling fall Chinook Salmon population in the Snake River without compromising fish performance or detectability at the dam.

中文翻译：

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在蛇河中以8、9和12毫米无源集成转发器标签标记的亚一岁秋努努鲑鱼的性能

基于种群中被标记个体的推论在一定程度上受到可标记鱼类最小尺寸的限制。标签越小，标签所代表的人口就越多，并应减少标签对鱼类生长的潜在影响。我们评估了幼年秋季奇努克鲑鱼Oncorhynchus tshawytscha的不同性能指标在Snake River中用8、9和12毫米PIT标签标记。我们没有发现证据表明，使用8mm标签标记的45–49mmFL鱼类的标记后死亡率高于使用9mm和12mm标签标记的较大鱼类的标记后死亡率。使用14针的标有8-mm标签的鱼的切口比使用12针的标有较大标签的鱼的切口愈合快。对于获得8毫米标签的个体，45-49毫米鱼的长度和质量增长高于50-59毫米鱼和60毫米及更大的鱼。与使用9mm和12mm标签的标签相比，使用8mm标签的标签的较大尺寸类别（50-59和≥60mm）的生长通常也更高。标签负担之间没有紧密的关系（即，标签重量或鱼尺寸等级的标签和生长指标时标签重量以鱼重的百分比表示）。在华盛顿州下格兰特水坝，比较了三种标签类型在幼鱼旁路中的检测效率的结果表明，所有鱼中有99％至100％被检测到。从饲养区到下花岗岩坝的鱼的存活率通常随鱼的大小而增加，并且逐年变化，但是没有明显的证据表明标签大小会产生影响。8毫米的PIT标签使我们能够在蛇河中代表一岁以下秋努克鲑鱼种群的大部分（即6.2–24.1％），而不会影响大坝的鱼类性能或可检测性。华盛顿显示，所有鱼类中有99％至100％被检测到。从饲养区到下花岗岩坝的鱼的存活率通常随鱼的大小而增加，并且逐年变化，但是没有明显的证据表明标签大小会产生影响。8毫米的PIT标签使我们能够在蛇河中代表一岁以下秋努克鲑鱼种群的大部分（即6.2–24.1％），而不会影响大坝的鱼类性能或可检测性。华盛顿显示，所有鱼类中有99％至100％被检测到。从饲养区到下花岗岩坝的鱼的存活率通常随鱼的大小而增加，并且逐年变化，但是没有明显的证据表明标签大小会产生影响。8毫米的PIT标签使我们能够在蛇河中代表一岁以下秋努克鲑鱼种群的大部分（即6.2–24.1％），而不会影响大坝的鱼类性能或可检测性。