CHANGES IN SCHOOL STRUCTURE ACCORDING TO EXTERNAL STIMULI - DESCRIPTION AND INFLUENCE ON ACOUSTIC ASSESSMENT

被引：64

作者：

FREON, P

GERLOTTO, F

SORIA, M

机构：

[1] Centre ORSTOM, Laboratoire HOT, 34032 Montpellier, Route du Val-de-Montferrand

来源：

FISHERIES RESEARCH | 1992年 / 15卷 / 1-2期

关键词：

D O I：

10.1016/0165-7836(92)90004-D

中图分类号：

S9 [水产、渔业];

学科分类号：

0908 ;

摘要：

The study of the internal school structure and behaviour of pelagic fish provides interesting information in relation to acoustic surveys, especially when comparing the undisturbed structure with the structure observed beneath a vessel passing over a school. The methodological approach involves in situ observations and combines acoustic and visual (aerial and underwater) techniques. The internal school structure is heterogeneous, including vacuoles, and this structure changes when the school is overpassed by a vessel during the day. In this case compression of the upper layer of the school is observed. The influence of this school structure on the variability of the density estimation has been studied. For the subsurface schools, the usual rate of sampling may be too low for some heterogeneous schools. Other consequences of the school structure on acoustics are discussed.

引用

页码：45 / 66

页数：22

共 26 条

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