Effects of cyprinid removal and reintroduction: Diamond Lake, Oregon

Eilers, J. M.; Miller, Rich; Loomis, D.; Vogel, Allan Hayes

doi:10.1080/10402381.2023.2207076

Cited by 1 publication

(1 citation statement)

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“…The density of Gloeotrichia colonies ranged from 60-560/L in the surface waters of Lemolo Lake. This event corresponded with a bloom of Gloeotrichia in Diamond Lake which resulted in the release of 120 colonies/L being discharged to Lake Creek [18]. Diatoms were also an important component of the phytoplankton community in Lemolo Lake.…”

Section: Resultsmentioning

confidence: 99%

Mechanical Removal of Minnows (Gila bicolor) to Improve Water Quality in a Hydropower Impoundment, Lemolo Lake, Oregon, USA

Eilers,

Vache,

Grost

2023

Hydrobiology

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A project to mechanically remove an over-abundant population of cyprinids (Gila bicolor) was tested in a hydropower impoundment, Lemolo Lake (USA). The netting program removed 29.7 tons of fish (163 kg/ha) over a seven-year period that resulted in a reduction in the intensity and duration of cyanobacteria blooms. However, the suppression of the tui chub population apparently allowed for a residual population of kokanee (Oncorhynchus nerka) to proliferate. The resurgence of the kokanee, combined with the initiation of a rainbow trout stocking program, offset some of the gains in water quality achieved with the reduction of tui chub biomass. The dominant cyanobacterium present in Lemolo Lake transitioned to Gloeotrichia echinulata in 2013, but the majority of these colonies were apparently derived from an upstream lake. The changes in water quality from 2005–2013 were simulated for Lemolo Lake using the two-dimensional, hydrodynamic model, CE-QUAL-W2. The model reproduced many aspects of the water quality in Lemolo Lake and was used, in combination with a simple Bayesian model, to evaluate a number of potential scenarios for further improving water quality in the impoundment. Promoting a deeper drawdown of the hydroelectric impoundment during the winter to selectively increase entrainment of tui chub and kokanee, combined with continued netting targeted at tui chub, was judged to offer the greatest opportunity to manage the facility for water quality, fisheries and hydropower objectives.

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Section: Resultsmentioning

confidence: 99%