International Limnology and Freshwater Fisheries Research (LimnoFish), Elazığ, Türkiye, 3 - 05 Eylül 2019, cilt.FIM-075, ss.126
In this study, it is aimed to determination of the relationship between water temperature and
fish distribution in Van Lake.
The study was conducted on 23-27 October 2018 in Van Lake. During the hydro acoustic survey
which conducted these dates limnologically measurements were made at 10 stations. Limnologically
measurements were performed with YSI 6600 v2 model measurement device. Measurements were
made at 1 m intervals up to a depth of 80 m from the surface. Sampling points were selected to cover
the entire Van Lake, representing shores and offshore.
It was observed that the coldest part of the lake is northeast. The temperature was measured
to increase towards the south and west. Determined 1.57 °C water temperature difference between
northest part of the lake (13.85°C) and southest part of the lake (15.42 °C). However the mixed
layer is more important. The mixed layer is less than 10 meters shallow in the middle of the lake and
deeper to more than 30 meters on the shores and south. This is considered to be a direct effect on the
fish distribution. However, this situation could not be proved statistically because of bad weather
conditions have not enough sampling. The tareks which are use 3 large rivers in the northeastern part
of the lake for breeding in late spring and early summer, pass to the warmer and deeper parts of the
lake in middle of autumn.
This informations show that, the temperature directly affects the distribution of tarek in Van