Influence of the Fish Introduction in Lakes of the Arid Southern Patagonia

Porcel, Sol; Saad, Juan Francisco; Marinone, María Cristina; Izaguirre, Irina; Lancelotti, Julio L.

doi:10.1007/978-3-031-10027-7_14

Cited by 1 publication

(1 citation statement)

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“…Ceriodaphnia pulchella occurred, which is known to coexist with planktivores in stocked alpine lakes. Additionally, rotifer abundance and biomass increased [7,12]. Lake drainage resulted in complex changes of the phytoplankton community.…”

Section: Physical Environment and Impact Of Fish On Lower Trophic Levelsmentioning

confidence: 99%

Pulling the Plug—Draining an Alpine Lake Failed to Eradicate Alien Minnows and Impacted Lower Trophic Levels

Schabetsberger

Jersabek

Maringer³

et al. 2023

Water

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Fish introduction into fishless high-altitude lakes has detrimental effects on biodiversity. Removal of alien fish through intensive fishing is cost-intensive and difficult to achieve in productive lakes. Lake Sulzkarsee is the only lake in the National Park Gesäuse, Austria, and was an important breeding site for amphibians until the lake was stocked with fish in the late 1970s. Salmonids were eradicated in 2005, but the lake remained degraded by the introduced minnows (Phoxinus sp.). In 2018, the lake was drained through a siphon pipe and then by pumping out water with dirt water pumps. The deepest part was treated with slaked lime, but several hundred adult minnows survived in sediment crevices and reproduced in the following season. After drainage, the phytoplankton biomass increased. Indicator species, such as Daphnia longispina and amphibians, showed signs of recovery, but they went back to an impacted state when minnows recovered after the failed eradication attempt. Purse seines proved to be the most efficient gear to catch minnows. These results indicate that deep mountain lakes are difficult to drain efficiently. Sediment treatment is required to eliminate all fish.

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Section: Physical Environment and Impact Of Fish On Lower Trophic Levelsmentioning

confidence: 99%