Open AccessInfluence of fish pond culture on the fish fauna of Ladoga Lake
Author(s) -
N. P. Milyanchuk,
N. V. Ilmast,
О. П. Стерлигова
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/941/1/012014
Subject(s) - perch , trout , fishery , eutrophication , rainbow trout , fish farming , biomass (ecology) , brown trout , population dynamics of fisheries , diversity of fish , fauna , environmental science , biology , nutrient , fish <actinopterygii> , aquaculture , ecology
The species composition and biological indices of Ladoga Lake fish near trout farms were studied. Water bodies with commercial rainbow trout production were found to be polluted mainly by nutrients and fish metabolic products that activate eutrophication processes. The functioning of a trout farm was shown to affect the fish population structure of the lake. Fish with spring spawning are preferred. Roach, perch and ruff now predominate in the fish farm area. Fish aggregates in the lake differ considerably in biomass from those in open lake zones. Fish density indices near the fish pond lines were observed to increase almost twofold. Local fish species aggregate near the fish ponds because they eat trout food. The linear and weight growth rates of roach, perch and ruff near the fish ponds were shown to be much higher than those in the remote zones of the lake, because the above fish also eat the leftovers of trout food washed out of the fish ponds. Commercial trout production requires integrated monitoring for assessment of the current condition of the water bodies affected by fish farming.