SC/T 1078-2022 in English

Background of Standard Revision and Technological Evolution

SC/T 1078-2022, as an important supporting standard for the Chinese mitten crab aquaculture industry, was revised for the first time in 18 years. This revision focused on resolving the contradiction between the adaptability of indicators such as crushing particle size and amino acid balance in the 2004 version of the standard and the current aquaculture practice, and added modern nutritional indicators such as lysine/crude protein ratio.

Comparative analysis of core indicators

Interpretation of key technical requirements

5.1 Appearance and properties

Explicitly prohibit sensory defects such as caking and mildew, and especially emphasize the particle size uniformity requirements of expanded feed.

5.3 Nutritional component indicators

Innovatively introduce the concept of stage nutritional requirements:
• Crab seedling stage: crude protein 36-45%, to meet the needs of metamorphosis and development
• Growing period: total phosphorus 1.0-1.8%, to support shell calcification

7.4 Moisture detection

GB/T 6435 is stipulated as the arbitration method, and the near infrared method can be used as a rapid detection method, but the deviation must be ≤0.5%.

Implementation Suggestions

Manufacturers

1. Establish a stage formula library and develop special feeds for crab seedlings/breeding crabs/adult crabs
2. Strengthen the control of puffing process to ensure that the dissolution loss rate is ≤10%
3. Add the lysine detection capability and equip with HPLC and other equipment

Farms

• Select special feeds for the reproductive period (crude protein 35-45%) to promote gonadal development
• Regularly inspect hygiene indicators, with a focus on heavy metal residues

Standard development trend

The next step may be to introduce indicators for functional additives (such as astaxanthin) and establish standards associated with aquaculture water quality parameters.