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Abstract
Long-term data record of Kinneret Epilimnetic Zooplankton biomass distribution and fish stock assessment was analyzed. The objective is aimed at defining the representativeness of the present sampling stations distribution for the measure of the entire Lake Kinneret zooplankton biomass. Previous studies documented the preeminence of temperature and fish predation impacts on zooplankton density: water temperature through growth rate trait and fish predation. Acoustic surveys indicated that fish shoals are mostly inhabiting the Peripheral region and much less the central part of the Kinneret pelagial. Due to fish zooplanktivory, densities of planktonic crustacean in the Pelagial periphery presented by 5 - 7 sampling stations are low. Nevertheless, large central lake area with higher densities of zooplankton biomass is presented by only one station. Therefore, stations average is incorrect as is total lake measure. The average result as indicated presently as total zooplankton biomass in lake Kinneret is, therefore, underestimated. Two optional corrective suggestions are concluded: 1) Additional sampling stations in the central part of the Pelagial region; 2) Usage of station value of aerial coefficient (promoter).
Highlights
IntroductionThe responsibility of the author of this paper was the Zooplankton study
Fish distribution was not concluded in the consideration of the sampling station spatial distribution
Zooplankton predation pressure is mostly operated by the small sizes including larvae, fingerlings of all species and adult Sardines [13]-[24]
Summary
The responsibility of the author of this paper was the Zooplankton study. Consideration was given to the Epilimnion thickness during stable Thermal stratification and the Thermocline is allocated at the shallowest depth. When Thermocline is allocated at the shallowest depth, hypolimnetic samples could be collected only at the central (A) and 1 or 2 other deep stations if WL is high enough. The reason for allocation of sampling stations was defined by bathymetry (depth contour lines) (Figure 1). Fish distribution was not concluded in the consideration of the sampling station spatial distribution. The impact of the relationships between the zooplankton biomass density
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