Reproductive Ecology of a Shad, Konosirus punctatus in Ariake Sound―II Development and Fate of the Ovarian Egg
Year: 1978
Type: article
Abstract: In order to know the process of the maturation of a shad, Konosirus punctatus, observations and measurements of the ovaries and ovarian eggs were done, and the following results were obtained. Eggs of the yolk globule stage and younger stages were observed together in an ovary during the spawning season. In some of such ovaries there were eggs older than yolk globule stage. In egg-diameter composition of an ovary taken in the spawning season, 1～4 modes were recognized, showing the existence of some batches in an ovary. The largest mode (the largest batch) in ovarian egg diameter composition is formed in more than 0.4mm. The largest batch passes the stage where the mode is in 0.41～0.70mm in 2 days of more. This batch passes the stage of 0.71～4.00mm in about half a day from 3a.m. to 3p.m., and becomes ripe. The spawning is carried out in the time from 3p.m. to midnight. Individual shad spawns twice or more in a spawning season of one month or one month and half. Spawning interval of the individual is estimated to be 3 days or more.
Author: Takita, Toru
Language: English
Subfield: Physiology
Domain: Life Sciences
SDG: Life below water
Open Access status: green
OpenAlex ID: W403344917