Reproductive ecology, age, and growth of the Kidako moray Gymnothorax kidako from Tateyama Bay, Chiba, Japan

Reproductive ecology, age, and growth of the Kidako moray Gymnothorax kidako from Tateyama Bay, Chiba, Japan
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日本千叶县立山湾的 Kidako 海鳗的生殖生态、年龄和生长

DOI:
10.1007/s10228-022-00902-0
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发表时间:
2022
影响因子:
1.2
通讯作者:
Sunobe T.
Sunobe T.
中科院分区:
生物学4区
文献类型:
--
作者:
Oomori;N.;Hamasaki;K.;Sunobe T.

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对日本千叶立山湾的鳗形目裸胸鱼(Kidako morayGymnothorax kidako)进行了生态学研究。虽然本种常见于沿着温带海岸,并在日本南部的地方城市作为食物分布,但其生殖生态,年龄结构和生长速度尚不清楚。于2015年1月至12月及2022年5月每月收集样本(共93名男性及117名女性)。男女全长无显著性差异。全年,雄性性腺指数相对稳定,并检测到精子。雌性性腺指数特别高,在7月至8月的卵巢中观察到三级卵黄发生卵母细胞。8月收集了一只腹部肿胀、充满排卵卵母细胞的雌性。结果表明,在G.立山的季节为7月至8月。年龄估计从右矢状耳石,在7月和8月之间形成一个单一的环的增量分析。根据耳石增量计数,男性58例,女性83例,年龄3-34岁。冯·贝塔朗菲的生长公式表明,男性和女性在头10年生长迅速,之后男女的生长速度减慢,但男性继续以高于女性的速度生长。
An ecological study of the Kidako morayGymnothorax kidako(Anguilliformes, Muraenidae) was conducted at Tateyama Bay, Chiba, Japan. Although this species is common along temperate coasts and is distributed as a food in local cities of southern Japan, its reproductive ecology, age structure, and growth rates are unknown. Specimens (in total, 93 males and 117 females) were collected monthly from January to December 2015, and in May 2022. There was no significant difference between the total length of males and females. Throughout the year, the male gonadosomatic index was relatively constant, and sperm was detected. The female gonadosomatic index was especially high and tertiary vitellogenic oocytes were observed in the ovary from July to August. A female with a swollen abdomen full of ovulated oocytes was collected in August. Results indicate that spawning inG. kidakoat Tateyama occurs from July to August. Age was estimated from increment analysis of the right sagittal otolith, on which a single annulus forms between July and August. On the basis of otolith-increment counts, 58 males and 83 females were aged 3–34 years. The von Bertalanffy growth formula indicated that males and females grow rapidly over the first 10 years, after which growth slowed for both sexes, but males continued to grow at a greater rate than females.
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