Rotenone calibration of fish density and biomass in a tropical stream sampled by two removal methods

Autor:	PENCZAK, T., AGOSTINHO, A.A., LATINI, J.D.
Rok vydání:	2018
Předmět:	Densidade Traditional sampling methods Brasil Corumba River system Estado de Goiás Density Biomassa Ecologia Riacho Rotenone Pesca Biomass Corumba Rio Sistema Small stream Fishing efficiency Brazil Ciências Biológicas Goiás State
Zdroj:	Repositório Institucional da Universidade Estadual de Maringá (RI-UEM) Universidade Estadual de Maringá (UEM) instacron:UEM
Popis:	PENCZAK, Tadeusz; AGOSTINHO, Angelo Antonio; LATINI, João Dirço. Rotenone calibration of fish density and biomass in a tropical stream sampled by two removal methods. Hydrobiologia, Dordrecht, v.510, no.1-3, p.23-38, 2003. A catch-depletion method was applied using two sampling gears in three sites of a small tributary of the Corumba River (Goiás State, Brazil) in two seasons. The gears were: a double stick net (DSN) in one site and electric fishing (EF) in two sites. The calibration of both gears was performed using rotenone. EF was almost sufficient to establish a complete local species list, but DSN was not. Underestimation of calculated density (N) and biomass (B) values for DSN and EF amounted to 62 and 29%, respectively. The results of N and B obtained by EF were too imprecise to calculate secondary fish production to be applied in a field bioenergeticsmodel.We could not conclusively prove that mean body weight of sampled populations was significantly lower for fish caught by EF, although all of these means were higher for fish collected by rotenone, at each site and on two sampling occasions.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=od______3056::3714cf8dcb4bd5c96eee3e119595f550 http://repositorio.uem.br:8080/jspui/handle/1/5268 Zobrazit plný text záznamu