Guziur J.F., Turkowski K., 1990. Economic aspects of table carp production under various management conditions. Acta Ichthyol. Piscat. 20 (2): 109-118.
The objective of the study was to determine the economic aspects of three treatments of table carp (C2-3) production. The treatments differed in the management measures used: (A) control ponds traditionally filled with water in spring, (B) experimental ponds filled in autumn, with intensive mineral fertilization, (C) experimental ponds filled in autumn, with intensive mineral fertilization and regulatory catches during the growing season made in order to decrease the fish density. Each the three treatments was studied using different stocking rates (1800-3600 ind. ha -1). In all treatments fish were fed with cereal feeds (barley) ad libitum. All ponds in treatments B and C were fertilized in two stages: initially in February-March over the ice, and secondly from April until July. In total 900 kgּha-1 NPK of fertilizers were used in each pond: 292 kgּha-1 of nitrogen (N),108 kgּha-1 of phosphorus (P) and 500 kgּha-1 of potassium (K). The highest production and the highest profit were obtained in treatment C. Cost of the stocking material represented the main item of the variable costs (from 60% in ponds with low stocking rates to 80% in ponds with highest stocking rates). Cost of fertilisers which were used in treatments B and C was low and amounted to only 1.5-2%.