Spawning behavior and artificial fertilization in captive reared red spotted grouper, Epinephelus akaara
| Autor: | Kumiko Okamoto, Ryou Oomori, Akinobu Nakazono, Shigenobu Okumura |
|---|---|
| Rok vydání: | 2002 |
| Předmět: |
Epinephelus akaara
Serranidae biology Artificial fertilization urogenital system media_common.quotation_subject Fish farming fungi Zoology Aquatic Science biology.organism_classification Fecundity Fishery fluids and secretions Human fertilization Grouper Reproduction reproductive and urinary physiology media_common |
| Zdroj: | Aquaculture. 206:165-173 |
| ISSN: | 0044-8486 |
| DOI: | 10.1016/s0044-8486(01)00722-0 |
| Popis: | Spawning behavior was observed in the red spotted grouper, Epinephelus akaara, to investigate the reason for low fertilization rates in spawning tanks. Artificial fertilization was also carried out to examine the egg quality of tank-reared fish. Grouper dashed in a pair vertically from the bottom to the water surface and released gametes at the surface. The pair sometimes jumped from the surface and swam horizontally on the water surface before or after spawning. The mean artificial fertilization rate (84.3%) was significantly higher than the rate of the spontaneous spawning in the tank (19.0%). The low tank fertilization rate may be due to limited space, especially insufficient water depth, which may have inhibited normal spawning behavior. |
| Databáze: | OpenAIRE |
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