In shrimp farming operations, stocking densities is an initial parameters that needs to be determined and be managed well. All this time the determination of the amount of benur stocking is done in ponds through Benur sampling bag and manual counting, so that the results obtained is a rough estimation. Manual count technique that is used in the hatchery and the farm has its drawbacks, which are:
- Quality of the count is very influenced by the physical condition and precision arithmetic of operators.
- The calculated sample amount is limited by time because benur which has been harvested in the hatchery should be immediately sent and in the other hand benur who had arrived at the pond needs to be immediately stocked.
Both of the drawbacks affect the accuracy of count. The low accuracy of count will affect in stocking density is off target. Actual stocking densities which were off target the potential may also immediately affect the production target pool. What often happens is also found a large difference between the number of arithmetic benur delivered (hatchery) and the amount received benur (pond) due to the low count accuracy in one-on-one or both locations count. This will cause a loss of sales benur not only in hatcheries, but also in our company.
In the middle of this year, the MRC team and QA-hatchery (TRD) have been tested Benur XperCount2 calculators developed by XpertSea, Inc. of Canada. This tool features:
- Portable and easy to operate (touch-screen).
- Available software for counting algae, eggs, nauplii and post-larvae.
- Can be used to calculate post-larvae stage PL4-PL12, with a maximum number of 5000 individuals (volume 1 L) and 50,000 Tails (5 liters).
- Time count is less than 5 minutes.
- The system software updates and uploads data via wireless networks.
Based on the results of this trial, we can concluded that:
- Technology XperCount2 has an accuracy rate of ± 10% count, better than the level of accuracy of counting manually.
- The process of calculating benur is very efficient.
- XperCount2 can help Benur QC process at the hatchery because it can calculate the length PL and long CV with a higher number of samples.
And, in the implementation of this technology in operational activities, we recommend that:
- This technology can be utilized to improve the quality of the estimation benur that will be sent and received.
- Because of the time count is rapid, sampling size (number of bags) can be propagated to improve the quality of the benur harvest estimation and benur spreading.
- To calculate benur which is less than 2,000 will be made in one count.
- To calculate benur which is more than 2,000 will be done in 2 times count (population will be divided into two).
- This technology is used in monitoring QC Benur hatchery (length and CV).
- If there is a difference count more than ± 10%, needs to be verified with a manual count-controlled technique.
Currently XperCount2 has been implemented at the hatchery BLK and perceived benefits expected to be operational at the hatchery and ponds.