On the Growth of the Ovum of the Flatfish, <i>Limanda yokohamae</i> (G<sub>ÜNTHER</sub>).

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  • マコガレイ卵巣卵の成熟過程について
  • マコガレイ ランソウラン ノ セイジュク カテイ ニ ツイテ

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The ovary and body tissue of the fish, Limanda yokohamae (GÜNTHER), caught by dragnet in Sendai Bay, were examined morphologically and physiologically during the maturation phase.<br> 1). In August oocytes begin to glow in ovary, and in December they are spawned, when their diameter measures about 0.7mm. Just before spawning, ovary contains a small amount of oocyte: (0.05mm. in diameter) beside a large amount of matured eggs (0.7mm. in diameter).<br> 2). The relation between egg-diameter and ovary-weight is shown by the following formula.<br> Ow=63.83Ed2.835<br> OW: Ovary-weight/body-weight×100 (%)<br> Ed: Egg-diameter (mm.)<br> 3). The relation between body-weight and egg-number is shown by the following formula.<br> En=1, 790Bw-225, 800<br> Bw: Body-weight (g.)<br> En: Egg-number<br> 4). The moisture of ovary decreases remarkably during the period from September (0.15mm. in egg-diame??er) to October (0.4mm. in egg-diameter).<br> 5). The weight and caloric value of egg are correlated to egg-diameter as follows:<br> Ew1000=465.5Ed2.592<br> Eq1000=732.8Ed2.717<br> Ew1000: 1, 000 eggs-weight (g.)<br> Eq1000: Caloric value of 1, 000 eggs (kcal.)<br> 6). Although the body-length and the body-weight show no observable increase during the maturation phase, the total caloric value of the female's body, including the ovary, keeps on increasing. This fact means that the growth of the fish continues during this phase.

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