Fecundity, Egg Quality and Ovarian Regression of Female Zebrafish in the Continuous Spawning Period
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Abstract
The zebrafish is one of the most important fish species in economic terms as it is an extremely popular aquarium fish. Farmers produce zebrafish stock continuously in order to supply the huge demand for the fish in the ornamental fish market. However, continuous breeding can lead to the deterioration in quality of the female fish. In this study, we focus on the regression of ovary after continuously spawning several times. Fecundity, fertilization rate, hatchability rate, number of abnormal larvae, and histology of the ovarian tissue were compared between females that spawn for the first time (control group) and females that had spawned continuously five times. The results showed that fecundity, fertilization rate and hatchability rate of eggs produced from female zebrafish that spawned continuously decreased, whereas the number of abnormal larvae produced increased. Moreover, histological studies of ovarian tissue revealed that female fish that had spawned continuously showed delayed development of oocytes in their in ovarian tissues. Therefore, it can be concluded that continuous spawning of females potentially causes abnormalities of ovarian tissue and affects the quality and quantity of zebrafish eggs and larvae. Farmers should set
an inter-spawning interval for female zebrafish that allows for good recovery of ovarian structure and function between spawning.
Article Details
King Mongkut's Agricultural Journal
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