Vol. XXIX, pp. 39-46 February 24, 1916 PROCEEDINGS OF THE BIOLOGICAL SOCIETY OF WASHINGTON A LIST OF THE FISHES OF THE SENECA CREEK, MONTGOMERY COUNTY, MARYLAND, REGION.* BY LEWIS RADCLIFFE AND W. W. WELSH. The present paper is based upon collections of fishes from the Chesapeake and Ohio canal near Rushville, Maryland, and from Little Seneca and Tenmile creeks near Boyds, Maryland, De-cember 12 to 14, 1911. The authors accompanied one of the parties of the United States Bureau of Fisheries engaged in reclaiming the food fishes from the canal. This party seined a section of the canal about six miles in length from a point near Sycamore Island in the Potomac River up to Tenfoot Island. Large quantities of fish were hauled ashore with the seine and thousands of food fish which would have perished if left in the canal were carried over the bank and released in the Potomac River. As many of these were breeders, the fish supply of this section of the river was considerably augmented. Under these conditions, exceptional opportunities were afforded for gather-ing data as to the species occurring in this region and their relative abundance. Many of the fishes congregated in the deeper holes, especially in the basin or widewater in the canal above Rushville. About half a mile below Rushville, there is a lock locally known as Violett's Lock. A feeder from the river enters the canal below the lock, affording a means of ingress for the fishes of this section of the river. As the section above the lock is fed from a point much higher up and as the lock acts as a partial barrier, differences in the fauna of the two sections existed. Now that the fish from both sections are being released into this part of the river, these differences may • Published with the permission of the United States Commissioner of Fisheries. 10— Proc. Biol. Soc. Wash.. Vol. XXIX. 1916. (39)
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