What should be done about the low survival rate of shrimp during transportation?

2026-06-05

I. Case Details

Date: August 6, 2024

Location: Nanpaihe Town, Huanghua City

Cultured species: Whiteleg shrimp

Pond area: 500 mu; water depth: 1 meter.

Water quality parameters: pH: 8.6; Ammonia nitrogen: none; Nitrite: none.

Phytoplankton composition: predominantly green algae, with minor amounts of golden algae and dinoflagellates; no protozoa detected.

Condition description: Body color is normal, but the carapace is soft and thin; the animal is weak and inactive. Mortality among individual shrimp in the inter‑whisker spaces is high, resulting in low survival rates during transport and reduced market value.

II. Handling Plan

Apply 1 box of Wai Po Su Bu Duo Kuang plus 1 bag of Glucose Ion Calcium to 100 mu of rice fields.

III. Feedback on Results

Vitality improves, body color becomes vibrant, skin hardens, and survival rates during transport increase significantly.

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IV. Case Analysis

In the later stages of culture, prawns molt more frequently, and the causes of soft-shell condition can be attributed to three main factors.

1. The hardness of the aquaculture water is insufficient, and the proportions of calcium, magnesium, and other mineral elements in the water are imbalanced.

2. The shrimp’s own physiological condition.

3. As aquaculture water quality deteriorates, long-term exceedances of ammonia nitrogen, nitrite, hydrogen sulfide, and other harmful substances lead to their progressive accumulation in the water, weakening the shrimp’s physiological condition and disrupting calcium metabolism, resulting in soft-shell syndrome.

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