On the number of eggs spawned by Japanese anchovy [Engraulis japonicus] in captivity
1990
Takao, K. (Nansei National Fisheries Research Inst., Ono, Hiroshima (Japan))
For the period 1985-1987, rearing experiments were made in the six lots to examine the annual total number of eggs spawned per female (TNE) for the Japanese anchovy. In 1981, 24 reared females being fished in the Hiroshima Bay in June used for counting the number of fully matured ova (FMO); =0.2mm in major axis) in the ovary during June-August of the main spawning season. The results were summarized as follows: 1) The TNE ranged from 9,784 to 50,178 in the three cases fed daily 20% to body weight. 2) As previously reported the reared fish fed 20% grew up like a wild fish, the TNE was considered to be about 50,000 as a maximum estimate. 3) The TNE was over about 70% in Lot 5 fed 20% compared to Lot 6 fed 10%. 4) Bearing it in mind that the 1,006 to 2,293 ova spawned daily in the experiments, about 2,000 FMO observed in the ovary seemed to be spawned at the same time
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