The use of a reliable zooplankton sample collection method is important for the quantitative and qualitative assessment of the food source available for juvenile fish. The effectiveness of zooplankton collection in illuminated cages is related to its concentration in the subsurface layer of water around or under the light source. The aim of this study was to compare the effectiveness of three zooplanktonsample collection methods in illuminated cages. The experiment was conducted in Lake Maróz,Poland, in illuminated net cages. The light source was an electric bulb (24 V, 60 W), located just abovewater’s surface and switched on 2 hours before sample collection. The zooplankton samples were collected using a bottle sampler and conical tow-net (mesh 30μm) hauled at two different speeds. Interms of qualitative and quantitative parameters, the optimal sample collection method was planktonnet hauled at a slow vertical rate (0.05 m s–1). Average results were obtained using a bottle sampler(5.0 dm3volume). Where as, plankton net hauled vertically at a fast vertical rate (0.10 m s–1) was the least effective method, due to the displacement of water outside of the net’s inlet
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.