海洋科学2016，Vol.40Issue(5)：76-81,6.DOI:10.11759/hykx20150714001
大海马游泳行为及游泳能力测定与分析
Determination and analysis of swimming behavior and swim-ming ability of yellow seahorse,Hippocampus kudaBleeker
摘要
Abstract
In this study, we used a self-made fish swimming capability analysis device to determine and analyze the critical swimming velocity in the horizontal and vertical directions of the yellow seahorse, Hippocampus kuda. Moreover, we describe its swimming behavior and evaluate its swimming ability. The results showed that under different flow velocities, the seahorse adopts different swimming poses. In low flow velocity, the animal moved around with ease with its tail curled. As the flow velocity increased, the tail opened and extended, slowly inclined, and its tilt angle became bigger and bigger in the vertical plane. The critical horizontal swimming velocity was ob-served to be closely related to the tilt angle. For the yellow seahorse, when the tail angle was between 55° and 60°, its horizontal swimming velocity was at maximum; when the angle was more than 60°, the animal lost its body balance. We observed that the motion power of the seahorse originates from the fins, especially, the pectoral fins, which determine the speed and direction of swimming via different stroke frequencies and water-shifting directions. We observed that when the stroke frequency was between 0.5 and 11 times·s−1, it was in proportion to its swimming velocity. We also observed the relationship between body length and the swimming critical velocity at a temperature of 25.5℃ ± 1.0℃. Moreover, we found that in the horizontal direction, the yellow seahorse had the greatest veloc-ity of 4.23 cm/s ±0.23 cm/s, with its body length varying from 4 to 6 cm, after which the velocity decreased to 2.86 ± 0.02 cm/s for more than 12 cm body length. In the vertical direction, similar to the horizontal direction, the greatest velocity was 0.372 cm/s ± 0.014 cm/s with its body length of approximately 6 cm, and the maximum absolute critical velocity was 0.085 BL/s ±0.010 BL/s. When the body length was more than 13 cm, the velocity was stable. Judging from its swimming behavior and critical velocity, the swimming ability of the yellow seahorse is not strong.关键词
大海马/水平方向/竖直方向/临界速度/游泳能力Key words
Hippocampus kudaBleeker/Horizontal direction/Vertical direction/Critical velocity of swimming/Body Length分类
农业科技引用本文复制引用
李响,徐永健..大海马游泳行为及游泳能力测定与分析[J].海洋科学,2016,40(5):76-81,6.基金项目
国家自然科学基金(41276123)@@@@National Natural Science Foundation of China, No.41276123。 （41276123）
