GB/T 16871-2026So-iuy mullet - Broodstock, fry and fingerlings (English PDF)

4.1 Source

4.1.1 Parent fish caught from natural sea areas.

4.1.2 Seedlings caught in natural sea areas or broodstock fish artificially bred from seedlings provided by provincial or higher-level original (good) seed farms.

4.2 Quality Requirements

4.2.1 Germplasm It should comply with the provisions of GB/T 19162.

4.2.2 Age and weight Age and weight are shown in Table 1.

4.2.3 Appearance Normal body shape and color, intact fins and scales, robust physique, sensitive reaction, and no deformities.

4.2.4 Characteristics during the reproductive period Female. The abdomen is enlarged, soft, and elastic; when the abdomen is facing upward, there is a distinct midline, and the genital opening is open. Male. When the abdomen is gently squeezed, a milky white semen flows out, which disperses upon contact with water.

4.2.5 Epidemics There are no trichodina or saprolegniasis.

5.1 Source Seedlings bred from parent fish that meet the requirements of Chapter 4.

5.2 Quality Requirements

5.2.1 Germplasm It should comply with the provisions of GB/T 19162.

5.2.2 Appearance Normal body color and shape, uniform size, intact fins and scales, smooth body surface with mucus, no obvious injuries or lesions, and active swimming.

5.2.3 Specifications Total length >= 30mm.

5.2.4 Quality The overall pass rate, disability rate, and deformity rate meet the requirements of Table 2.

5.2.5 Epidemics There are no trichodina or saprolegniasis.

6.1 Broodstock Inspection

6.1.1 Source Review archives and breeding/production records.

6.1.2 Germplasm Test according to the method described in GB/T 19162.

6.1.3 Age For farmed broodstock, consult their aquaculture records; for wild-caught broodstock, use scales as age determination material and test them according to the method described in GB/T 18654.4.

6.1.4 Weight Test according to the method described in GB/T 18654.3.

6.1.5 Appearance Place the sample in an observable container, examine it visually under natural light, and record each item.

6.1.6 Characteristics during the reproductive period A combination of visual observation and tactile squeezing was used.

6.1.7 Epidemic The symptoms and diagnosis of trichodiniasis were determined according to the methods described in SC/T 7247.The symptoms and diagnosis of saprolegniasis are shown in Table 3.

6.2 Seedling Inspection

6.2.1 Source Consult the seedling records.

6.2.2 Germplasm Test according to the method described in GB/T 19162.

6.2.3 Appearance Place the seedling samples in an observable container, examine them visually under natural light, and record each item.

6.2.4 Specifications Test according to the method described in GB/T 18654.3.

6.2.5 Overall Length Pass Rate Three random samplings were conducted, with at least 100 fish selected from the seedling population each time. The total sample size and the number of fish with a total length >=30mm were counted, and the results were calculated using the formula. (1) Calculate.

6.2.6 Deformity and Disability Rates Three random samplings were conducted, with at least 100 fish selected from the seedling population each time. The total number of samples, the number of injured fish, and the number of deformed fish were counted according to formula (2) and the formula. Calculate using equation (3).

6.2.7 Epidemic The symptoms and diagnosis of trichodiniasis are determined according to the methods described in SC/T 7247.The symptoms and diagnosis of saprolegniasis are shown in Table 3.

7.1 Inspection Classification

7.1.1 Factory Inspection Each batch of broodstock and fry products should undergo an outgoing inspection. The inspection items for broodstock include age, weight, appearance, and disease detection. The inspection items for fry include appearance... Appearance, specifications, overall length pass rate, disability rate, deformity rate, and disease.

7.1.2 Type Testing The inspection items include all items specified in this document. Type testing shall be conducted in any of the following circumstances.

a) Pike fry cultivated in newly built aquaculture farms;

b) When changes in breeding conditions may affect the quality of parent stock and seedlings;

c) When the national quality supervision agency or the industry regulatory authority requests type testing;

d) When there are significant differences between the factory inspection and the previous type inspection;

e) During normal production, a type test should be conducted at least once a year;

f) When replacing parent fish or when the number of parent fish changes significantly.

7.2 Batching Rules Broodstock are considered as one inspection batch within the same production or sales batch. Seedlings are considered as one inspection batch within the same rearing pond. An inspection batch should... If the sample is tested more than twice, the average value is taken as the test value.

7.3 Sampling Method Perform according to the method specified in GB/T 18654.2.

7.4 Judgment Rules If a batch fails to meet the disease prevention and control standards, it is deemed unqualified and should not be re-inspected. If any one or more of the following indicators-overall length pass rate, disability rate, or deformity rate-fail to meet the standards, the batch is considered unqualified. If the result is acceptable, the batch is deemed unacceptable, and a retest of the original batch should be conducted, with the retest result being the final determination.