Fish biomass and gonad development in the Rotopiko (Serpentine) lakes.

Author: Wu, Nicholas; Daniel, Adam Joshua; Tempero, Grant Wayne

Publisher: Environmental Research Institute, The University of Waikato

Type: Report

Link to this item using this URL: http://hdl.handle.net/10289/8458

University of Waikato

Abstract

The Rotopiko (Serpentine) lake complex is one of the Waikato region’s few peat lake systems that contains primarily native aquatic plants. Retaining the natural state of the lakes has been considered a high priority by the Department of Conservation (DOC) and extensive efforts have taken place to prevent nutrient leaching and to control invasive organisms in the lakes. The University of Waikato was contracted to investigate the biomass of introduced and native fish in the Rotopiko lakes in order to determine if the fish removal with rotenone, a chemical piscicide, was required as proposed by DOC. Fish were collected using a variety of traps and nets prior to making and release. Following a dispersal period, each lake was then fished a second time and fish biomass was estimated using a capture-mark-release-recapture study design; population estimates were derived using the Lincoln-Petersen method (Nichols 1992).

Subjects: fish

Copyright: © 2013 the authors.