Structure and properties of the egg mass of the ommastrephid squid Todarodes pacificus.
Structure and properties of the egg mass of the ommastrephid squid Todarodes pacificus.
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DOI：
10.1371/journal.pone.0182261
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发表时间：
2017
期刊：
影响因子：
3.7
通讯作者：
Sakurai Y
中科院分区：
文献类型：
--
作者：
Puneeta P;Vijai D;Yamamoto J;Adachi K;Kato Y;Sakurai Y
日本飞鱿鱼，Todarodes pacificus，被认为是产生中性浮力的卵团，通过漂浮在密度略有不同的水层之间的界面上，在水柱中保持特定的位置。了解决定卵块垂直分布的物理过程，以预测它们与胚胎存活和随后的补充有关的水平漂移是很重要的。在此，通过创建热分层（17-22°C）水柱以获得卵块，在300 m3的水箱中进行围隔实验。一个笼网的方法，以维持详细的观察卵块。我们测量了T. pacificus的，并利用这些信息来推断产卵场（对马海峡，日本）的卵块的垂直分布格局。当单独测量时，每个卵块的外部胶状物的密度比周围水的密度高2.7 σ单位。外部胶状物和嵌入的单个卵的比重（~1.10）导致卵团相对于它们形成的水中具有非常轻微的负浮力。对产卵场垂直剖面的分析表明，水密度（σθ）在~30 m深度处急剧增加，因此，卵块可能会在密度跃层之上沉降。因此，我们认为T.在韩国和日本之间的对马海峡，太平洋鱼卵块可能通过漂浮在密度略有不同的水层之间的界面上而保持其在水柱中的位置，这些水层恰好在密度跃层之上（实际深度随季节/年度而变化）。
The Japanese flying squid, Todarodes pacificus, is thought to spawn neutrally buoyant egg masses that retain a specific location in the water column by floating at the interface between water layers of slightly different densities. It is important to understand the physical process that determines the vertical distribution of the egg masses to predict their horizontal drift in relation to embryo survival and subsequent recruitment. Here, mesocosm experiments were conducted in a 300 m3 tank by creating a thermally stratified (17–22°C) water column to obtain egg masses. A cage net methodology was developed to sustain egg masses for detailed observation. We measured the density of the egg masses of T. pacificus, and used this information to infer the vertical distribution patterns of the egg masses at the spawning grounds (Tsushima Strait, Japan). When measured separately, the density of the outer jelly of each egg mass was 2.7 σ units higher than that of the surrounding water. The outer jelly and the specific gravity of embedded individual eggs (~1.10) cause the egg masses to have very slight negative buoyancy relative to the water in which they are formed. Analysis of the vertical profile of the spawning ground showed that water density (σθ) increased sharply at ~30 m depth; thus, egg masses might settle above the pycnocline layer. In conclusion, we suggest that T. pacificus egg masses might retain their location in the water column by floating at the interface between water layers of slightly different densities, which happen to be above the pycnocline layer (actual depth varies seasonally/annually) in the Tsushima Strait between Korea and Japan.
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影响因子：
2.5
作者：
Ohizumi, H;Kuramochi, T;Miyazaki, N
通讯作者：
Miyazaki, N
影响因子：
1.9
作者：
KIMURA, S;SUGIURA, Y;HANAOKA, Y
通讯作者：
HANAOKA, Y
影响因子：
1.4
作者：
GIORGI, AE;CONGLETON, JL
通讯作者：
CONGLETON, JL
DOI：
10.1016/0022-0981(84)90231-4
发表时间：
1984-01-01
影响因子：
2
作者：
CHAFFEE, C;STRATHMANN, RR
通讯作者：
STRATHMANN, RR
影响因子：
1.2
作者：
Kimura, S;Higuchi, Y;Sakurai, Y
通讯作者：
Sakurai, Y