GB/T 21326-2026Black sea bream - Broodstock, fry and fingerlings (English PDF)

4.2 Quality Requirements

4.2.1 Germplasm It should meet the requirements of SC/T 2132.

4.2.2 Age Male parent fish must be 2 years or older, and female parent fish must be 3 years or older.

4.2.3 Appearance The scales are intact, the body color is normal, and there are no external injuries or deformities.

4.2.4 Weight Male parent fish >= 500g, female parent fish >= 750g.

4.2.5 Characteristics during the reproductive period The gonads are well developed; the female parent fish have a swollen and soft abdomen with a clearly visible genital opening; and the male parent fish can expel milky white semen when the abdomen is gently pressed.

4.2.6 Epidemics Cryptocaryon irritans, Edwardsiella ferruginosa, and infectious spleen and kidney necrosis virus should not be detected.

5.1 Source Seedlings that meet the requirements for breeding parent fish as specified in Chapter 4.

5.2 Specifications Total length >= 3.0cm.

5.3 Quality Requirements

5.3.1 Appearance Normal body color and shape, uniform size, good vitality, and sensitive response to external stimuli.

5.3.2 Countable Indicators The overall pass rate is >=95%, and the rate of deformity and disability is <=5%.

5.3.3 Epidemics Fish viral neuronecrosis virus, Edwardsiella retinoides, and infectious spleen and kidney necrosis virus should not be detected.

6.1 Parent fish

6.1.1 Source Review the records of harvesting and purchasing or the breeding records of broodstock.

6.1.2 Germplasm Test according to the method given in SC/T 2132.

6.1.3 Age Test according to the method given in GB/T 18654.4.Production records can be checked for broodstock provided by the original (superior) breeding farm.

6.1.4 Appearance Observe with the naked eye under natural light.

6.1.5 Weight Determined according to the method given in GB/T 18654.3.

6.1.6 Characteristics during the reproductive period The detection method combines visual observation, gentle finger pressure and touch, and microscopic examination of germ cells.

6.1.7 Epidemic Cryptocaryon irritans was tested according to the method given in GB/T 34733, and Edwardsiella tarda was tested according to the method given in SC/T 7214.1. Infectious splenorenal necrosis virus was detected according to the method given in SC/T 7211.

6.2 Seedlings

6.2.1 Source Check production or purchase records.

6.2.2 Appearance Place the seedlings in a container that is easy to observe, add an appropriate amount of seawater, and inspect them one by one with the naked eye under natural light.

6.2.3 Countable Indicators The total length was determined according to the method given in GB/T 18654.3.The proportion of seedlings with a total length meeting the requirement of

5.2 was counted out of the total number of seedlings. Overall length pass rate. Under sufficient light, visually observe and count the proportion of damaged and deformed individuals to the total number of seedlings, and calculate the deformity and injury rates. Residual rate.

6.2.4 Epidemics Fish viral neuronecrosis virus was detected according to the method given in SC/T 7216, and fish Edwardsiella tarda was detected according to SC/T 7214.1. The method for detecting infectious spleen and kidney necrosis virus is as given in SC/T 7211.

7.1 Parent Fish

7.1.1 Sampling Method For disease testing, the relevant testing standards shall apply; for other indicators, the standards of GB/T 18654.2 shall apply.

7.1.2 Inspection Items This includes appearance, age, weight, and, for the breeding season, characteristics specific to the breeding season. All items specified in Chapter 4 should be examined if any of the following conditions are met. content.

a) Broodstock introduced and bred in newly built aquaculture farms;

b) When replacing parent fish or when the number of parent fish changes significantly;

c) When changes in the aquaculture environment may affect the quality of the broodstock;

d) When required by the national quality supervision agency or the industry regulatory authority.

7.1.3 Batch Rules Parent fish bred in the same batch.

7.1.4 Judgment Rules If the disease test fails, the entire batch of broodstock is deemed unqualified and should not be retested. If other tests fail, samples should be taken from the original batch. A re-inspection will be conducted, and the results of the re-inspection shall prevail.

7.2 Seedlings

7.2.1 Sampling Method Countable indicators shall be implemented in accordance with the provisions of GB/T 18654.2; at least 100 seedlings shall be randomly sampled from each batch for observation of appearance and statistical analysis. The pass rate, deformity rate, and disability rate were measured twice, and the average value was taken. Disease testing was conducted according to the relevant testing standards.

7.2.2 Inspection Items This includes appearance, specifications, and countable indicators. All items specified in Chapter 5 should be inspected under any of the following circumstances.

a) Seedlings cultivated in newly established breeding farms;

b) When changes in the breeding environment may affect the quality of the seedlings;

c) When required by the national quality supervision agency or the industry regulatory authority.

7.2.3 Batching Rules Seedlings delivered in one go or bred in the same batch are considered as one inspection batch.

7.2.4 Judgment Rules If the disease test fails, the batch of seedlings is deemed unqualified and should not be retested; if other tests fail, samples should be taken from the original batch. A re-inspection will be conducted, and the results of the re-inspection shall prevail.