| 摘要: |
| 于1987年3月–1988年1月在室内水池中观测黑鲷失去视觉后对气泡幕的反应，比较同种参数气泡幕对正常视觉黑鲷与失去视觉黑鲷的阻拦效果；采用大小适宜的红黑双层布将鱼的双眼裹住，使鱼失去视觉，探讨气泡幕对鱼类作用的机制。结果表明，黑鲷失去视觉后，活动受到很大限制，游泳行为发生变化，游速显著低于正常视觉时，气泡幕对其阻拦率由正常视觉时75.1％下降到45.2％，下降了39．8％。t－检验表明，两种视觉状态下的阻拦率存在极显著差异（P＜0.01）。黑鲷失去视觉后，并未对气泡幕产生显著的适应。实验表明，气泡幕除了对鱼类视觉产生作用外，还对听觉及其它感觉产生作用。 |
| 关键词: 气泡幕 作用机制 阻拦效果 黑鲷 |
| DOI： |
| 分类号: |
| 基金项目:农牧渔业部资助项目，1987 |
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| A STUDY ON THE INTERCEPTING MECHANISM OF AN AIR-BUBBLE CURTAIN ON BLACK PORGY (SPARUS MACROCEPHALUS) |
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ZHAO Xi-guang,LIU Li-dong,HE Da-ren
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1.College of Fisheries Ocean University of Qingdao, Qingdao, 266003;2.Department of Oceanography, Xiamen University, Xiamen, 361005
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| Abstract: |
| Indoor experiments were undertaken to investigate into the intercepting effects of an immovable air-bubble curtain (IBC) on artificially blinded black porgy (Sparus macrocephalus) during March 1987 to January 1988. The IBC was constructed from a hard polyethylene pipe (17.5 mm i.d.), fixed on the middle part of the bottom of an experimental tank, from which columns of bubbles escaped through a series of holes (0.5 mm i.d.) bored in the upper side of the pipe at 5.0cm intervals. Compressed air with a pressure of 0.25 kg/cm2 was supplied by a compressor (Model: A1301, Japan). The experimental tank (3.5m long, 2.5m wide, and 0.8m deep), filled with seawater with more than 3.5m diaphaneity, was surrounded with black cloth. The tank top was illuminated with two 40W fluorescent lamps giving 80 lx on the central surface to facilitate monitoring fish behaviors. The experimental fish, with an 8.0-13.5 cm body-length, were obtained from a local fish hatchery in Xiamen and maintained in the laboratory for 1-2 days prior to test. Twenty-five fish in good conditions were randomly selected and divided into five groups to be tested. The five fish with their eyes being blinded with a folded red-black cloth were put in the experimental tank and allowed to acclimate the new environment for 24-48h prior to test. Each experiment was carried out by dividing into two testing sections, for an aeration experiment and a control experiment (without IBC). The observation period of each section was 1h. The control experiment was performed randomly before or after the aeration experiment. Three replicates were successively carried out for each of the fish group. In all experiments, the behaviors of fish were observed with a CC-1500 television camera mounted over the tank, and the events were recorded on a video-tape. The time when the fish passed through the air-bubble curtain or the air pipe and the number of passage were registered readily. The results show that when fish lose their visions, their activities are restricted and they swim slower than those in a normal vision state. The IBC is still an obstacle to the blinded fish. The obstructing rate of IBC to fish decrease from 75.1% (normal) to 45.2% (blinded). There is a significant difference in the obstructing rate (t-test, P＜0.01) between the two vision states. In addition, the black porgy has no marked adaptation to IBC when they lose their vision. The results suggest that the air-bubble curtain has effects on the behaviors of the black porgy through its vision, audition and other sensory systems. Perhaps these effects vary under different conditions and with different fish species. |
| Key words: Air-bubble curtain, Intercepting mechanism, Intercepting effect, Sparus macrocephalus |
