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5362078 
Technical Report 
Estimation of numbers for a riverine Necturus population before and after TFM lampricide exposure 
Matson, TO 
1990 
0 
45 
33-38 
English 
BIOSIS COPYRIGHT: BIOL ABS. The purpose of this research was to assess the impact of the lampricide, 3-trifluormethyl-4-nitrophenol, upon the mudpuppy, Necturus maculossu, in the Grand River, Lake County, Ohio (USA). Pre-treatment and entire season population estimates for 1987 and 1988 were made using Schnabel estimation. Population estimates ranged from 556-1,118 per km in 1987 but declined to 280-397 per km in 1988. Comparison of pre-treatment or entire season estimates between years indicate a minimum 29% decrease in population size. Individuals within the range of total lengths examined appear to exhibit equal sensitivity to TFM. Intensive seining ad manual turning of rock slabs were effective methods for capturing Necturus; trapping and electroshocking proved ineffective.