The Importance of Regular Shrimp Sampling

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Sampling activities probably is one of those activities that shrimp farmers do a lot. In the whole culture process, the sampling process aims to generate information about a large group of animals – such as a shrimp population in a pond – by looking at a small number of individuals. Routine sampling common in most ponds to monitor the shrimp population, determine the size and weight of the shrimp, assess the physical condition and quality of shrimp, evaluate the health of the shrimp thoroughly, and test the population to determine the possible presence of pathogens or diseases.

Sampling is very important to be done regularly to determine the latest Main Body Weight (MBW), which affects the other weekly needs for the whole shrimp culture activity. Some things that are affected by Main Body Weight (MBW) include Survival Rate (SR), Average Day Gain (ADG), Feed Conversion Ratio (FCR), and determining the Feed Index.

Sampling activities are usually carried out in the morning to avoid shrimp that are in the process of moulting and to avoid low levels of dissolved oxygen in the water. The stages of sampling activities, in general, can be concluded as follows:

  1. The bottom of the fishing line must be hard and not muddy so that the mud is not easily mixed. For the capture of collected shrimp, feeding is carried out at the fishing ground.     
  2. Turn off the watermill at the nearest location where the sample is taken.     
  3. Use nets as fishing gear with sufficient weight and automatic pockets that can facilitate the process of removing shrimp from the net. 
  4. Prepare enough water in the container to accommodate the caught shrimp.     
  5. Measure with sufficient weight (± 1 kg).     
  6. Count the number of shrimp caught in the net and measure the diameter of the throwing net.    
  7. Take some shrimp to be examined in the laboratory.     
  8. Immediately put the shrimp slowly back into the pond.     

Shrimp taken as a sample is expected to represent the entire shrimp in the pond. The sampling activity is carried out by catching shrimps using nets that are spread at one or several points of the pond. The number of shrimp taken can also vary, ranging from tens of tails or just a few kilograms.

If the growth rate is reached every time sampling is done, it means that there is an expected increase in shrimp weight. If it does not reach the growth target, it must be ensured that there is a change to the previous cultivation method. Cultivation methods that can be improved include water quality, feeding methods, suitability of aquaculture treatment, to the performance of the shrimp themselves.

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