Ganias Kostas, Michou Stella, Nunes Cristina
School of Biology, Aristotle University of Thessaloniki , Thessaloniki , Greece.
IPMA-Instituto Português do Mar e da Atmosfera , Lisboa, Avenida de Brasilia s/n , Portugal.
PeerJ. 2015 Apr 9;3:e892. doi: 10.7717/peerj.892. eCollection 2015.
The present study assesses swimbladder dynamics in natural occurring sardine, Sardina pilchardus, populations with the aim to examine whether this is affected by bathymetric positioning and the physiological state of the individuals. To do so, swimbladder size and shape were modeled in relation to catch depth and the size of various visceral compartments such as gonad, liver, fat and stomach. Swimbladder size was shown to be related to depth in a way that individuals with smaller swimbladders occurred at larger depths. Moreover, evidence is provided that the swimbladder in sardine might have a functional relationship both with the reproductive and the feeding state of individuals, since none of the fish with hydrated gonads and/or large stomachs displayed distended swimbladders.
本研究评估了自然种群中沙丁鱼（Sardina pilchardus）的鱼鳔动态，旨在研究其是否受到个体的测深定位和生理状态的影响。为此，建立了鱼鳔大小和形状与捕获深度以及性腺、肝脏、脂肪和胃等各种内脏器官大小之间的模型关系。结果表明，鱼鳔大小与深度有关，鱼鳔较小的个体出现在更深的深度。此外，有证据表明，沙丁鱼的鱼鳔可能与个体的生殖和摄食状态都存在功能关系，因为没有一条性腺饱满和/或胃大的鱼表现出鱼鳔膨胀。
