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A r.PID ASSESSMENT APPr.ACH FOr.EVALUATING SILVEr.CAr. GENDEr

水生生物学报 2018年第6期42卷 1081-1083页

作者： WOLF Michael C. PHELPS Quinton E. seibert justin r. Tr.PP Sar. J. Depar.ment of Natur.l r.sour.es Fish and Wildlife Division204 Main Street East BaudetteMinnesota 56623USA West Vir.inia Univer.ity Division of Forestry and Natural Resources307C Percival HallMorgantownWest Virginia 26505USA Southeast Missour. State Univer.ity Biology Department 1 University Plaza Cape GirardeauMissouri 63701USA Big r.ver. and Wetlands Field Station Missouri Department of Conservation3815 East Jackson BoulevardJacksonMissouri 63755USA

Silver.car. Hypophthalmichthys molitr.x wer. intr.duced into the U.S. to contr.l water.quality in aquacultur. ponds. Fr.m this point of or.gin, silver.car. escaped into near.y r.ver. thr.ugh multiple flood events. Because of their.documented negative effects on native biota, silver.car. have been labeled as pr.blematic. Ther.for., evaluating the biology and ecology of these non-indigenous species is cr.tical. Multiple par.meter. ar. needed to evaluate silver.car. populations(length, weight, age, and sex). Fur.her.or., developing methods for.r.pidly acquir.ng these data ar. needed. In r.lation to sex deter.ination, sexual dimor.hism was obser.ed wher. males exhibit distinct pector.l fin r.y featur.s. Specifically, males have pr.nounced r.dges or.a "r.ugh patch" on the dor.al sur.ace of pector.l fins. Ther.for., to test if this was an applicable way of deter.ining silver.car. gender. silver.car. wer. collected fr.m Midwester. U.S. r.ver.(N=2015) in the fall of 2011(N=870), spr.ng of 2012(N=645), winter.of 2013—2014(N=202) and summer.015(N=323) via electr.fishing. For.each silver.car. collected, pr.sence(e.g., r.ugh patch) or.absence(e.g.,smooth) of pr.nounced r.dges on the top side of the pector.l fins was r.cor.ed, and an incision was made in the body cavity to identify gender. Based on the r.sults of our.evaluation, gender.was cor.ectly identified over.9% of the time(2006 out of 2015) based on the pector.l fin dimor.hism. In the samples taken in the winter.of 2013—2014 and summer.of 2015, accur.cy for.silver.car. shor.er.than 300 mm and longer.than 800 mm was 53.7%(19 out of 41) while accur.cy for.silver.car. between 300 mm and 800 mm total length was 98.9%(289 out of 292). This study pr.vides a r.pid assessment appr.ach for.evaluating silver.car. gender.

关键词： Invasive species Gender assessment

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