Ovarian maturation and spawning of the deep-water mud shrimp Solenocera melantho de Man, 1907 (Decapoda, Penaeoidea, Solenoceridae) in Kagoshima Bay, southern Japan
Ovarian maturation and spawning of the deep-water mud shrimp Solenocera melantho de Man, 1907 (Decapoda, Penaeoidea, Solenoceridae) in Kagoshima Bay, southern Japan
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DOI：
10.1163/156854098x00671
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发表时间：
1998-09-01
期刊：
影响因子：
0.6
通讯作者：
Koshio, S
中科院分区：
文献类型：
--
作者：
Ohtomi, J;Yamamoto, S;Koshio, S
深水泥虾Solenocera melantho是日本南部鹿儿岛湾底栖生物群落中最主要的物种之一，是小型拖网渔船的主要目标物种，具有重要的商业价值。利用从海湾中心区采集的大量雌性标本，对卵巢成熟、性成熟时的大小和产卵季节等生殖方面进行了研究。这一物种具有一个异步类型的卵巢，包含不同发育阶段的卵母细胞。根据卵巢中最高级卵母细胞的发育阶段，将卵巢成熟期分为四类：静止期、发育期、早熟期和成熟期。成熟的卵巢中含有未成熟的卵母细胞，在卵母细胞的外周部分有皮质隐窝。具有成熟卵巢的雌性被定义为将在几天内产卵的成熟雌性。雌性性成熟时的甲壳长度估计为25.3毫米（1岁）。性腺指数（GSI = 100 ×生殖腺重量/体重）随卵巢成熟而显著增加，GSI ≥ 12的雌性大多数已成熟。估计产卵季节从6月持续到12月，高峰期在10月和11月。在产卵季节的早期，只有2和3岁的女性群体成熟。1岁组的年轻女性在7月至12月成熟。
The deep-water mud shrimp Solenocera melantho is one of the most dominant species in the benthic community of Kagoshima Bay, southern Japan, and is commercially important as the main target species for small-scale trawlers. The reproductive aspects such as ovarian maturation, size at sexual maturity, and spawning season were examined using a large number of female specimens collected from the central area of the bay. This species exhibits an asynchronous type of ovary that contains oocytes of various developmental stages. Ovarian maturity stages were divided into four categories based on the developmental stage of the most advanced oocytes in the ovary: quiescent, developing, early ripe, and ripe. The ripe ovaries contain prematuration-stage oocytes where cortical crypts are found in the peripheral part. Females with ripe ovaries were defined as mature females which would spawn within a few days. The size at sexual maturity of females was estimated to be 25.3 mm in carapace length (1-year old). The gonadosomatic index (GSI = 100 x gronadal weight/body weight) was significantly increased with the progress of ovarian maturation, and most females with GSI greater than or equal to 12 were mature. The spawning season was estimated to continue from June to December with its peak during October and November. In the early spawning season, only the 2- and 3-year old groups of females matured. Young females in the 1-year old group matured from July to December.