The Israeli Journal of Aquaculture - Bamidgeh 53(3-4), 2001, 115-127

INFLUENCE OF TROUT CAGE CULTURE ON WATER QUALITY,
PLANKTON AND BENTHOS IN AN ANATOLIAN DAM LAKE

Nilsun Demir, Mine U. Kirkagac, Serap Pulatsü, Süleyman Bekcan

University of Ankara, Faculty of Agriculture, Department of Fisheries and Aquaculture, 06110 Diskapi, Ankara, Turkey

(Received 3.6.01,Accepted 19.8.01)

Key words: cage culture, environment, rainbow trout, Turkey, water quality

Abstract

The effects of rainbow trout cage culture on water quality, phytoplankton, zooplankton and benthos were investigated in a cage farm of 30 ton capacity in Kesikköprü dam lake. Water temperature did not differ among stations while dissolved oxygen and pH values were slightly lower in the station with cages. Significant and insignificant increases were detected in concentrations of ammonia, nitrate, orthophosphate and chlorophyll a in the cage station. Also, the abundance of phytoplankton, zooplankton and benthos was highest in the cage station. The composition of phytoplankton was not fundamentally different among stations except for a higher abundance of Chlorophyceae and Cyanophyceae species in the cage station in November. The composition of zooplankton and benthos did not differ among stations; rotifers and gastropods were dominant, respectively.

home