Reproductive parameters of the chub mackerel <Emphasis Type="Italic">Scomber japonicus</Emphasis> estimated from human chorionic gonadotropin-induced final oocyte maturation and ovulation in captivity |
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| Authors: | Tetsuro?Shiraishi Kohei?Ohta Akihiko?Yamaguchi Mari?Yoda Hisashi?Chuda Email author" target="_blank">Michiya?MatsuyamaEmail author |
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| Institution: | Laboratory of Marine Biology, Faculty of Agriculture, Kyushu University, Fukuoka 812-8581,;Seikai National Fisheries Research Institute, Fisheries Research Agency, Nagasaki 851-2213 and;Nagasaki Prefectural Institute of Fisheries, Nagasaki 851-2213, Japan |
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| Abstract: | ABSTRACT: Final oocyte maturation and ovulation of captive chub mackerel Scomber japonicus with fully yolk-accumulated oocytes were induced by a single injection of human chorionic gonadotropin. Reproductive parameters, including spawning frequency and batch fecundity, which are required to estimate spawning biomass in pelagic fish by the daily egg production method, were analyzed. Germinal vesicle migration (GVM) occurred at 18–24 h post-injection, and the hydration and ovulation of oocytes were completed at 30 and 36 h post-injection, respectively. The results of the maturation process suggest that fish with GVM-stage ovaries captured in the daytime from the field are capable of spawning on the night following their capture. The oocytes used in the oocyte size-frequency distribution method for batch fecundity estimates should be at late GVM and more advanced stages. The results of sequential artificial insemination showed that the quality of ovulated eggs held in the ovarian lumen rapidly deteriorated as time progressed after ovulation. This indicates that the fertilization window for the ovulated eggs of chub mackerel lasts only a few hours, and spawning behavior should be performed within a few hours after ovulation in the wild population. |
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| Keywords: | batch fecundity chub mackerel fertilization rate final oocyte maturation human chorionic gonadotropin ovulation |
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