# Status and Distribution of the Chesapeake Logperch
## 2 Methods  
We reviewed available information detailing historic (prior to 1950), recent historic (1950-2000), and recent (post 2000) fisheries surveys conducted within the range of _P. bimaculata_. These data were found in published studies in the literature, unpublished reports, or in the PFBC, PSU, and SRBC resource databases or files. Survey types and purposesthat reported collections of _P. bimaculata_ ranged widely and were rarely standard from collection to collection. Abundance reporting varied and consisted of relative abundance, coarse abundance, or presence-absence, or it was presented in summary form. A summary of data sources utilized is found in Table 1.  
We conducted fisheries surveys during 2004-2023 to determine the current status and distribution of _P. bimaculata_. These data were supplemented with contemporaneous survey information from other collectors when available. Our collections are noted with our affiliations (PFBC, PSU, and SRBC) unless initials are used (J.R.S., R.W.C.) in Table 1. The focal area surveyed was the Susquehanna River drainage, including tributaries, downstream of York Haven Dam in York, Lancaster, and Chester counties--the likely historic extent of occurrence in Pennsylvania. A total of 199 surveys reported _P. bimaculata_, two in the historic period, 39 in the recent historic period, and 158 in the recent period (Table 1). Of those surveys, 119 were conducted by us in the recent historic (P.S.U., J.R.S.) and recent periods. \begin{table}
\begin{tabular}{c c c c c c} \hline
**Map ID\#** & **HUC 12 Name** & **Period** & **Surveys** & **Survey Totals** & **Collector** \\ \hline
10 & Susquehanna River—Fishing Creek & Historic & 2 & 2 & [PERSON] \\ \hline
17 & Susquehanna River—Muddy Creek & Recent Historic & 1 & & Ichthlyological Associates (JRS) \\ \hline
18 & Muddy Creek & Recent Historic & 1 & & Ichthlyological Associates \\ \hline
19 & Susquehanna River—Haines Branch & Recent Historic & 30 & & Ichthlyological Associates (JRS), Normandeau, PFBC, PSU, Radiation Management Corp. \\ \hline
20 & Susquehanna River—Conowingo Dam & Recent Historic & 7 & 39 & Normandeau, PFBC \\ \hline
17 & Susquehanna River—Muddy Creek & Recent & 14 & & Normandeau, PFBC, PSU, RWC, SRBC \\ \hline
18 & Muddy Creek & Recent & 8 & PFBC, PSU, RWC \\ \hline
19 & Susquehanna River—Haines Branch & Recent & 77 & & Lancaster Conservation Dist., Normandeau, PFBC, PSU, RWC, SRBC \\ \hline
20 & Susquehanna River—Conowingo Dam & Recent & 5 & & Normandeau, PFBC, PSU, RWC \\ \hline
21 & East Branch Octoraro Creek & Recent & 8 & & PFBC, PSU, RWC, VA Tech \\ \hline
22 & West Branch Octoraro Creek & Recent & 34 & & PFBC, PSU, RWC \\ \hline
23 & Octoraro Creek & Recent & 12 & 158 & ANSP, Normandeau, PFBC, PSU \\ \hline  & All HUC12 & All Periods & & 199 & All Collectors \\ \hline \end{tabular}
\end{table} 
Table 1: List of collectors contributing to known occurrences of _Percina bimaculata_ in Pennsylvania during the historic (prior to 1950), recent historic (1950–2000), and recent (post 2000) periods. Map identification number corresponds with HUC 12 watersheds in Figures 3–5. Pennsylvania Fish and Boat Commission (PFBC), The Pennsylvania State University (PSU), Susquehanna River Basin Commission (SRBC), Robert W. Criswell (RWC), Academy of Natural Sciences Philadelphia (ANSP), Virginia Polytechnic Institute and State University (VA Tech). Figure 4: Map of HUC 12 watersheds (grey) containing recent historic (1950–2000) collections of _Percina bimaculata_ in Pennsylvania. Numbers used to identify HUC 12 watersheds correspond with Tables 1 and 2. HUC 12 number 17 is occupied as far upriver as Holtwood Dam. Figure 3: Map of likely historic (pre-disturbance) distribution of _Percina bimaculata_ in Pennsylvania displayed as HUC 12 watersheds (grey). [PERSON] [1,2] reported collections twice from the Susquehanna River likely occurring near Columbia, Pennsylvania. Numbers used to identify HUC 12 watersheds correspond with Tables 1 and 2.