Showing posts from February, 2017

How to control White feces disease in Shrimp Farming


During the early 2010, concerned by high shrimp selling prices, many manufacturers decided to use improved stocking densities in the pursuit of higher production levels. However, abnormally high water temperatures (>32°C) and greater feeding rates resulted in increased organic matter levels in the ponds, with the occurrence of a new pathological entity called “white feces disease”. The disease was first identified in Penaeus monodon cultivated in low salinity waters (3- 5‰), but it was far along spread throughout complete shrimp production area, where currently 99% production corresponds to Litopenaeus vannamei. 

Disease scenario:
The disease happens under different soil conditions, and it results in depreciated water quality. Peak mortality rates are seen in the appearance of very low oxygen (<3.0 mg/L)/low alkalinity (<80 ppm) levels. Initial disease signs appear in both control feed trays and at water surface, where abundant floating white feces are observed.

Water Quality Management in Shrimp Culture

Water quality management is basically the management of water quality parameters daily to keep it in optimal conditions for growth of shrimp.This is very important to prevent the shrimp experience stress that can accelerate the shrimp to various diseases.

Water quality parameters that must be managed well are:

(1) Transparency and Water Color,

(2) pH (Potential Hydrogen)

(3) DO (Dissolved Oxygen)

(4) Salinity

(5) Temperature

(6) TAN (Total Ammonia Nitrogen)

(7) Free Ammonia (NH3) and

(8) Alkalinity

Transparency and Water Color:
These water quality parameters reflecting the type and density of plankton.Core of this management is that each change can be followed and is anticipated to avoid stress on the cultured shrimp.The more intense the color of water signifies the more dense the number of existing plankton.Plankton density is too high may affect fluctuations in dissolved oxygen and pH in the pond.On a sunny day, the amount of dissolved oxygen will be very high and the pH tends to lower, while …