TY - JOUR
T1 - Utilizing external features and a consensus field-based approach to determine sex of lake michigan yellow perch
AU - Dub, Joshua D.
AU - Roswell, Charles R.
AU - Czesny, Sergiusz
N1 - Funding Information:
We are grateful to Brian Shepherd and his laboratory group at the U.S. Department of Agriculture’s Agricultural Research Service for an early introduction to externally distinguishing sex in Yellow Perch. We also thank Sara Thomas, Nate Jermaine, Rebecca Rogers, Justin Bopp, Heather Sundstrom, Michael Rucinski, Scot Peterson, and Diane Wudi (Lake Michigan Biological Station); and the Illinois Department of Natural Resources. Funding was provided by the Federal Aid in Sport Fish Restoration Act under Projects F-123-R and F-52-R.
PY - 2017/9/3
Y1 - 2017/9/3
N2 - Understanding fluctuations in population sex ratios is important for evaluating the effects of changes in population demographics and for making informed management decisions. The Yellow Perch Perca flavescens, an important sport fish in Lake Michigan, undergoes sexually dimorphic growth, likely resulting in differing vulnerabilities to angler harvest. However, sex ratio data from angler-harvested fish have not been collected because of the handling time and intrusiveness of the methods for distinguishing sexes. We utilized digital photographs of the urogenital papilla (UGP) from known-sex Yellow Perch to establish a method whereby UGP shape could be used to rapidly, accurately, and inexpensively determine the sex of Yellow Perch.Overall, 88.1% of Yellow Perch examined were assigned to the correct sex, and the sex ratio estimate of 48:87 (female: male) did not differ significantly from the known sex ratio of 46:89. Classification success was not affected by fish sex, TL, or month of collection. Our results demonstrate accurate, rapid, inexpensive, and nonlethal applicability of this method across a wide range of sizes and geographic and temporal scales. Applying this methodology will permit accurate sex ratio estimates for angler-harvested Yellow Perch, which can be used to better understand harvest composition and its implications for management.
AB - Understanding fluctuations in population sex ratios is important for evaluating the effects of changes in population demographics and for making informed management decisions. The Yellow Perch Perca flavescens, an important sport fish in Lake Michigan, undergoes sexually dimorphic growth, likely resulting in differing vulnerabilities to angler harvest. However, sex ratio data from angler-harvested fish have not been collected because of the handling time and intrusiveness of the methods for distinguishing sexes. We utilized digital photographs of the urogenital papilla (UGP) from known-sex Yellow Perch to establish a method whereby UGP shape could be used to rapidly, accurately, and inexpensively determine the sex of Yellow Perch.Overall, 88.1% of Yellow Perch examined were assigned to the correct sex, and the sex ratio estimate of 48:87 (female: male) did not differ significantly from the known sex ratio of 46:89. Classification success was not affected by fish sex, TL, or month of collection. Our results demonstrate accurate, rapid, inexpensive, and nonlethal applicability of this method across a wide range of sizes and geographic and temporal scales. Applying this methodology will permit accurate sex ratio estimates for angler-harvested Yellow Perch, which can be used to better understand harvest composition and its implications for management.
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U2 - 10.1080/02755947.2017.1342724
DO - 10.1080/02755947.2017.1342724
M3 - Article
AN - SCOPUS:85051826270
SN - 0275-5947
VL - 37
SP - 1107
EP - 1111
JO - North American Journal of Fisheries Management
JF - North American Journal of Fisheries Management
IS - 5
ER -