Abstract
This study was carried out at fish laboratory of Animal Production Department, college of Agriculture, university of Sulaimaniya using commercial dry yeast probiotics (Saccharomyces cerevisiae) in three concentration ( 3%, 5% and 7%) to study their effects on growth performance of common carp fingerlings( Cyprinus carpio) fed diets and some of water parameters.The experiment was included nine treatments each in three replicates (plastic aquaria) in which 10 fingerlings common carp of the same size and weight (3.5 gram) were stocked in each aquarium. The actual experimental feeding trials durated for three months. Results indicated that thethird treatment(7% concentration of the yeast) giving more weight gain, growth rate and best relative growth weight.Monthly samples of water were taken from each pond for measuring water quality control, temperature and dissolved oxygen, BOD5, pH, EC (dc/m), TDS, No2 (mgl-1 No2-N), No3 (mgl-1 No3-N).
Highlights
Freshwater fish habitat is constrained by water quality, food supply, human interference, and other parameters (1)
The tested commercial dry yeast probiotics (Saccharomyces cerevisiae) were used to study their effects on growthperformance of common carp (Cyprinuscarpio fingerlings.The animals were allowed to adapt to the experimental system for a week and fed with a conventional diet after which time the different treatments(control treatment without any addition, first treatment addition of 3% of the dry yeast, second treatment the addition of 5% of the dry yeast and the third treatment the addition of 7% of the dry yeast ) were randomly assigned to the tanks with three replicates per treatment.Feed was manually administered ad libitum twice / day for 12 weeks
The obtained results showed that the third treatment had a significant (P
Summary
Freshwater fish habitat is constrained by water quality, food supply, human interference, and other parameters (1). The determinantof good growth in water body includes dissolved oxygen,hardness, turbidity, alkalinity, nutrients, temperature, etc.other parameters like biological oxygendemand, and chemical oxygen demand indicate pollutionlevel of a given water body. Fish are extremely sensitive toenvironmental factors such as oxygen levels, water salinity, temperature, etc. Given that fish are poikilotherms, water temperature is a major determining factor in fish biology. The most obvious effect of high temperatures is an increase of the embryonic development rate without affecting the relative timing of formation of the anatomical structures.The major water quality factors that are important in freshwater aquaculture systems and methods to monitor them are described in this publication. Knowledge of testing procedures and interpretation of results are important to the fish farmer (3and[4]).Because the quality of water environment is considered the main factorscontrolling fish quality and subsequentially its growth and production
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