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首页> 外文期刊>ICES Journal of Marine Science >Target strength of mesopelagic lanternfishes (family Myctophidae) based on swimbladder morphology
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Target strength of mesopelagic lanternfishes (family Myctophidae) based on swimbladder morphology

机译：基于游泳囊形态的中古生灯笼鱼（Myctophidae科）的目标强度

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摘要

This article reports theoretical values of target strength (TS) for mesopelagic lanternfishes based on morphological measurements of their swimbladders. Three species of lantern-fishes, Diaphus theta (26.9-77.4 mm standard length (SL)), Symbolophorus californiensis (85.0-108.4mm SL), and Notoscopelus japonicus (126.0-133.2mm SL), were examined. After external morphological measurement of the fish body, a specialized "soft X-ray" imaging system was used to map the swimbladders and obtain their morphological parameters. The swimbladder was inflated in D. theta, uninflated in S. californiensis, and was absent in N. japonicus. For D. theta, the swimbladder length does not increase in proportion to the body length, suggesting that the contribution of the swimbladder to acoustic reflection is reduced with growth in this fish. Based on the morphological measurements, the theoretical TS of the fish at 38 kHz was calculated using the approximate deformed-cylinder model (DCM) and the general prolate-spheroid model (PSM). For all three species, the calculations showed about 3 dB difference between the TS indicated by the DCM and PSM. Given that the description of body shape is poor in PSM, the DCM results were adopted for fish without a swimbladder or an empty one. The intercept b_(20) in the standard formula TS = 20 log SL + b_(20) was -85.7 dB (DCM) for S. californiensis and -86.7 dB (DCM) for N. japonicus. On the other hand, the PSM model was adopted for D. theta since its swimbladder has too small an aspect ratio to apply the DCM. For D. theta, the relationship between SL and TS is best expressed by TS = 11.8 log SL - 63.5, which implies that its scattering cross-section is not proportional to the square of the body length.
机译：本文报告了根据其泳囊的形态学测量值得出的中古角目鱼类的目标强度（TS）的理论值。检查了三种彩灯鱼：Dia鱼（Thetaphus theta）（26.9-77.4 mm标准长度（SL）），加州象征鱼（Symophophusus californiensis）（85.0-108.4mm SL）和Notoscopelus japonicus（126.0-133.2mm SL）。在对鱼体进行外部形态学测量之后，使用专门的“软X射线”成像系统来绘制游泳标本并获得其形态学参数。游动囊在D. theta中膨胀，在S. californiensis中不膨胀，而在日本猪笼草中则不存在。对于D. theta，游泳bla的长度不会与体长成比例地增加，这表明游泳to对鱼的声反射的贡献随着鱼的生长而减少。根据形态学测量结果，使用近似形变圆柱模型（DCM）和普通长椭球形模型（PSM）计算了38 kHz时鱼的理论TS。对于所有三个种类，计算结果表明DCM和PSM指示的TS之间存在约3 dB的差异。由于在PSM中对身体形状的描述很差，因此将DCM结果用于没有泳衣或空鱼的鱼类。标准公式TS = 20 log SL + b_（20）中的截距b_（20）对于加州沙门氏菌为-85.7 dB（DCM），对于日本猪笼草为-86.7 dB（DCM）。另一方面，由于D.theta的泳囊的纵横比太小而无法应用DCM，因此PSM模型被用于D. theta。对于D. theta，SL和TS之间的关系最好用TS = 11.8 log SL-63.5表示，这意味着其散射截面与体长的平方不成比例。

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