Size and structure of a new lake minnow, Eupallasella percnurus (Pall.), population established through translocations
Justyna Sikorska, Jacek Wolnicki, Rafał Kamiński
ABSTRACT. In July and August 2010, the Lincoln-Petersen capture-recapture method was used to assess the size and basic structure of a newly established population of the endangered in Poland cyprinid fish lake minnow, Eupallasella percnurus (Pall). The population that inhabits a small (0.08 ha) peat excavation site in the village of Kowalicha near Radzymin (Mazowieckie Voivodeship, Poland) was initiated in 2004-2006 using the translocations of a total of 1530 cultivated individuals, mostly juveniles aged 0+. The total size of the E. percnurus population was estimated to be 600 individuals excluding aged 0+. The population size is not considered to be large in comparison with other populations inhabiting water bodies of similar surface areas. Males proved to be predominated by females – phenomenon typical of populations of this species – but at relatively high ratio of approximately 1:4. Most of females were aged 2+, whereas most of males were older (3+). These data indicate that the population remains in the early stages of development. The Lincoln-Petersen method proved useful in the studies of the size and structure of E. percnurus populations.
Keywords: lake minnow, population size, sex structure, length distribution, age structure
CORRESPONDING AUTHOR:
J. Sikorska [+], J. Wolnicki, R. Kamiński
Pond Fishery Department in Żabieniec
Inland Fisheries Institute in Olsztyn
Główna 48, Żabieniec, 05-500 Piaseczno, Poland
Tel. +48 22 756 74 86; e-mail: justyks@infish.com.pl