ENVIRONMENTAL IMPACTS OF POND MANAGEMENTS ON WATER QUALITY, PLANKTON ABUNDANCE AND PRODUCTIONS OF TILAPIA AND MULLET IN EARTHEN PONDS

Ibrahim M. Shaker; Mona H. Ahmed

and Ashraf M.A. Soliman

Central Laboratory for Aquaculture Research (CLAR), Agriculture Research Center, Ministry of Agriculture, Egypt.

Corresponding author: [email protected]

Received 5/ 10/ 2016

Accepted 24/ 11/ 2016

Abstract

The present study was conducted in the provinces of Kafr El-Sheikh – Ismailia and Port Said on two farms in each governorate. Four earthen ponds with an area two faddan in each fish farm which irrigated with the main drain was cultivated by Nile tilapia and mullet with an average weight of 2; 30 g for tilapia and mullet, respectively. Water samples were taken once a month to measure water quality parameters and phytoplankton and zooplankton abundances. Fish samples were taken monthly to calculate the growth rates. The obtained results showed that:

There were no significant differences between the two farms in each province in temperature – salinity – conductivity and hardness in each province while there were a significant increase in pH – dissolved oxygen – transparency – total alkalinity – dissolved phosphorus – nitrogen compounds (ammonia – nitrite- nitrates) and chlorophyll a in the farm that depends on organic fertilization.

Significance increase of nitrogen compounds, phytoplankton and zooplankton abundance in fertilized ponds than that in artificial feeding system. Significance increase of nitrogen compounds, phosphorus and phytoplankton and zooplankton abundance in Kafr El-Sheikh fish farm followed by Shader Azzam, Sharkia governate under two the systems. The present study clear that the water quality in Shader Azzam and Kafr El-Sheikh are very heavy considers any relevant biological content is high so we must take this into in fish density and pond management does not represent a danger during the season. Significantly (P<0.05) increase in daily growth rate in tilapia than mullet in each fish pond under different pond managements. Also, significantly increase of
daily growth rate in feed system ponds than fertilizers system. Significantly increase of total fish production per Fadden on Shader Azzam and after the Kafr el-Sheikh fish ponds under feeding systems and the same trends in fertilizers systems. The study reported that the water quality of the fish farms depends mainly on the applied management system. It also decided that malpractice is the main cause of water pollution problems and degradation of the water quality level. The use of waste in fish pond management as feed or fertilizers depends on many factors, including:

Quality and types of Soil and water; quality and quantity of waste; stocking of fish and feeding habitats; Water temperature; age and the purpose of administration and the purpose of using waste.