A field study of hearing in the cod,Gadus morhua L.
A field study of hearing in the cod,Gadus morhua L.
复制标题
鳕鱼听力的实地研究，Gadus morhua L.
DOI：
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发表时间：
1973
期刊：
影响因子：
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通讯作者：
A. Hawkins
中科院分区：
文献类型：
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作者：
C. Chapman;A. Hawkins
1.墨华鳕（Gadus morhua L.）听觉的野外测量已经表明，这些鱼对频率范围从30到470 Hz的纯音敏感，在60到310 Hz的范围内最敏感。在最敏感的频率上，平均听阈在-18和-26 dB/μbar之间变化（图4）。第5-7段）。只有在平静的海洋条件下，才能获得未掩蔽的阈值。通过人为提高噪声水平，证实了噪声的掩蔽效应。3.在1.7 ~ 50 m范围内，阈值与声源距离基本无关，表明鳕鱼对声压敏感。然而，当声源移动到距离鱼1 m以内时，在低于50 Hz的频率下，注意到向粒子位移敏感性的转变（图9）。在不同声源距离处获得的阈值的差异可以用耳石器官的位移敏感性来解释。这些响应于从远场中的鱼鳔再辐射的位移，以及在非常低的频率下在近场中的更大的入射位移。
Summary1.Field measurements of hearing in the cod,Gadus morhua L., have shown that these fish are sensitive to pure tones in the frequency range from 30 to 470 Hz with greatest sensitivity in the range 60 to 310 Hz. At the most sensitive frequencies the mean thresholds varied between -18 and -26 dB/μbar (Fig. 4).2.Variation in the thresholds at most frequencies was related to changes in the level of ambient sea noise (Figs. 5–7). Only in calm sea conditions were unmasked thresholds obtained. The masking effect of noise was confirmed by raising the level artificially. The thresholds increased in proportion to the increase in noise level.3.The thresholds were largely independent of the distance of the sound source over the range from 1.7 to 50m, suggesting that cod are sensitive to acoustic pressure. However, a changeover to particle displacement sensitivity was noted at frequencies below 50 Hz when the sound source was moved to within l m of the fish (Fig. 9).4.It is concluded that the swimbladder plays an accessory role in hearing. Differences obtained in the thresholds at different sound source distances may be explained in terms of the displacement sensitivity of the otolith organs. These respond to displacements re-radiated from the swimbladder in the far-field, and to the greater incident displacement in the near-field at very low frequencies.