Why is my liquidation report different from my last monitoring in MAX?
One of the core values of using MAX, is understanding what your harvest looks like before the harvest happens. However, you may notice differences between results of that report in terms of average weight and commercial sizes comparing them to your last monitoring session in xpertSea MAX. Those discrepancies can be explained by multiple factors.
Average Body Weight Comparison
If you are comparing the average body weight results between the liquidation report of your processing plant and your last monitoring session with xpertSea MAX, these differences may be caused by the following reasons:
Days between last monitoring and date of processing: It is important to consider the time between your last monitoring session and processing at the plant. If your team did not monitor the pond on the day of harvest, the number of days between the two analyses makes comparing the two results difficult, because the shrimp likely continued to grow between the last monitoring and the harvest date. It is recommended to do a monitoring session with MAX on the day of harvesting.
Lost weight by dehydration: After shrimp are being harvested, they lose some of their body weight during the transit from the farm to the plant. Typically the larger the distance between the farm and the plant, the larger the difference in weight. Additional delays can be experienced at the plant between the shrimp arriving and being processed, which would increase the difference in weights.
Note: xpertSea has completed analyses that show this difference between the last monitoring at the farm and the liquidation report could be anticipated by a mathematical model. This feature is still under development as results are preliminary, but feel free to get in touch with your xpertSea representative to learn more about this!
Commercial Class Distribution
If you are comparing the commercial sizes from your plant with the last distribution graph on xpertSea MAX, important considerations need to be taken into account:
Sufficient sample size: Sample size of your last monitoring session with xpertSea MAX is crucial. Statistically, to be able to accurately estimate the distribution of a population with the high confidence and low margin of error, the sample size should be between 300-500 animals. If having an accurate view of the commercial class breakdown is important, we strongly recommend taking a special monitoring session before harvest with a larger sample size than normal to ensure you will get representative and accurate results.
Representative sampling: Even when a large sample size is taken, if the sample is not taken appropriately it will lead to error. For example, if 300 shrimp are taken only from shallow areas in the pond, it likely is not representative of all of the shrimp in the pond. It is important to keep in mind that xpertSea MAX provides insights based on the sample analyzed, so if the sample is not representative, the results and insights may be misleading.
Process done at the plant: xpertSea uses precise commercial class sizes, and does not round to the near gram. If you are using only the rounded body weights, the results will vary slightly from what is in the platform.
Of course, taking good pictures is necessary to obtain the most accurate results. Learn more here on how to take the best pictures to get the best results.
If you have any further questions or would like assistance completing an analysis, please reach out to your xpertSea representative and we will be happy to assist you.
