Sampling process in vannamei shrimp farming is crucial for monitoring Average Body Weight (ABW), body length, size uniformity, Survival Rate (SR), and early signs of disease or stress. However, when not conducted properly, the sampling process can lead to muscle cramps in shrimp. So, how can this be prevented? Find out in the article below!
Cause of Muscle Cramp in Vannamei Shrimp and How to Prevent It
1. Physical stress due to rough handling
Using rough nets, pulling them too quickly, or lifting too many shrimp at once can cause micro injuries to the muscles and joints of the shrimp. This leads to abnormal muscle contractions, resulting in symptoms of cramping.
To prevent this, use soft nets or scoops, avoid taking too many shrimp at once, and minimize the time shrimp are kept out of the water (ideally under one minute).
2. Temperature and oxygen fluctuations during sampling
Drastic differences in temperature and oxygen levels often occur when sampling is done early in the morning while water is still cold, and the shrimp are immediately exposed to hot or dry air. This can cause uncontrolled muscle contractions or cramped.
Best to conduct sampling when the water temperature is stable, such as between 08.00–10.00 AM. Pre-wet the sampling containers with pond water, and if needed, provide additional aeration to maintain oxygen levels.
