SC/T 9439-2020 in English

Standard Background and Scope of Application

SC/T 9439-2020 was proposed by the Fisheries Administration of the Ministry of Agriculture and Rural Affairs, under the jurisdiction of the National Technical Committee for Aquatic Products Standardization, and drafted by the Gansu Fisheries Technology Extension Center and other units. This standard specifies the technical requirements for the entire process from parent stock selection to effect evaluation for the reproduction and release of the endemic fish species Lanzhou cone (Silurus lanzhouensis).

Analysis of core technical requirements

1. Quality indicators of released species

2. Key points for inspection implementation

Key operating specifications

1. Preparation before release

• Water quality adjustment: Adjust the water temperature and pH to the requirements of SC/T 9401-2010 3 days in advance
• Packing density: 200-350 seedlings/bag for 5-15cm, 100-200 seedlings/bag for seedlings over 15cm
• Transportation requirements: Temperature control of live water truck ≤20℃, transportation time ≤4 hours

2. Special requirements for marking and release

For individuals with a total length of ≥12cm, please note:

• Use 1.5‰-2.0‰ anesthetic for treatment
• Use 2.0‰ saline to disinfect the wound after surgery
• Fill in the special record form specified in Appendix B

Implementation suggestions

1. Key points of quality control

1. Parental traceability: Establish parent archives to avoid inbreeding
2. Process monitoring: Two persons review the inspection report at the release site
3. Emergency treatment: Prepare backup oxygen supply equipment and water quality regulator

2. Technical evolution direction

Compared with the 2015 version of the local standard, this specification has the following major upgrades:

• Added drug residue detection indicators
• Refined the operating rules for marking and releasing
• Introduced the calibration requirements for electronic counting equipment