Reproductive biology of Japanese gizzard shad (Nematarosa japonica) in coastal water around Okinawa Island, Ryukyu Archipelago, southern Japan.
Reproductive biology of Japanese gizzard shad (Nematarosa japonica) in coastal water around Okinawa Island, Ryukyu Archipelago, southern Japan.
复制标题
日本南部琉球群岛冲绳岛沿岸水域日本砂鲥鱼（Nematarosa japonica）的繁殖生物学。
DOI：
10.1007/s10228-012-0291-1
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发表时间：
2012
影响因子：
1.2
通讯作者：
M. and K. Tachihara
中科院分区：
文献类型：
--
作者：
Uehara;M. and K. Tachihara
利用在日本西南部冲绳岛附近采集的标本，对日本沙鱼（Nematalosa japonica）的生殖周期和产卵特征进行了组织学研究。在50%成熟时，雌鱼的标准长度约为170毫米，雄鱼的标准长度约为160毫米，与3岁左右的鱼相当。据估计，产卵季节发生在1月至5月，2月至4月达到高峰，这与一年中最冷的水温密切相关。雌雄鱼的脂体指数从1月开始下降，一直维持到7月，可能是由于鱼消耗能量进行繁殖。2月至4月的产卵间隔约为1.3至1.8天。使用69个卵巢测试的雌性的生殖力(F)与SL相关：F= 1.313 × 10−4× SL3.966。组织学观察和鱼市调查表明，根据成熟个体的存在，该物种在砂质泥泞区（<20 m）产卵。本研究结果对自然资源保护和管理的启示。japonicaare讨论。
The reproductive cycle and spawning characteristics of the Japanese gizzard shad (Nematalosa japonica) were examined histologically using specimens collected around Okinawa Island in southwestern Japan. The observed lengths at 50 % maturity were approximately 170 mm in standard length (SL) for females and 160 mm SL for males, which corresponded approximately to 3-year-old fish. The spawning season was estimated to take place from January to May, peaking from February to April, which closely coincided with the coldest water temperatures of the year. The lipidosomatic index of both sexes decreased from January onward and maintained low values until July, presumably as the fish expended energy to reproduce. Spawning intervals were estimated to occur between 1.3 and 1.8 days from February to April. Fecundity (F) for females tested using 69 ovaries was related to SL:F= 1.313 × 10−4× SL3.966. Histological observations and a fish market survey suggested that the species spawned in sandy muddy areas (<20 m) based on the presence of mature individuals. The implications of our results toward conservation and management ofN. japonicaare discussed.