Reference values of some indicators of the so-iuy mullet Liza haematocheilus (Temminck & Schlegel, 1845) from the Azov and Black Seas Basin at different stages of reproductive cycle
The long-term data on the so-iuy mullet Liza haematocheilus (Temminck & Schlegel, 1845) from the Azov-Black Sea Basin have been analyzed regarding the observation seasons, fish sex and stages of gonad maturity. The following parameters of the fish have been assessed: distribution of oocytes by their diameter, the content of total protein and lipids in muscles, gonads and liver, and cholesterol and lipids in blood serum. When evaluating variation series of large samples of oocytes in the period of protoplasmic growth, medians and percentiles can be calculated and used further as reference values to assess frequency distribution of oocyte diameters of a specific individual. The comparison is carried out by correlating indicators of the reference series with the empirical median of the specimen examined. Extensive empirical material analyzed by resampling has been used to calculate with the help of mathematical modelling the reference points that cover 80–90 % of the sample; these points can be applied as markers when we analyze either separate specimens or the sample in question. It is shown that in the Azov and Black Sea Basin, the so-iuy mullet spawns once a year with the exception of those years that are characterized by a prolonged and cold winter. Under such conditions, a repeated spawning is possible. The content of total protein and lipids was shown to reflect the intensity of adaptation processes that occur in the fish preparing for wintering and spawning. In the females, these processes have a more pronounced amplitude due to the specificities associated with a significant redistribution of plastic resources during gonad maturation.
| Main Authors: | , , , |
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| Other Authors: | |
| Format: | Journal Contribution biblioteca |
| Language: | Russian |
| Published: |
2019
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| Subjects: | Long-term records, Females, Gonads, Spawning periods, Proteins, Lipids, Liza haematocheilus, Reproductive cycle, Oocytes, |
| Online Access: | http://hdl.handle.net/1834/15071 |
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