Relationships between the geometric dimensions and biomass of schools
Working paper
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http://hdl.handle.net/11250/104705Utgivelsesdato
1990Metadata
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This report is not to be cited without prior reference to the authorsSammendrag
Acoustic measurements of the geometric dimensions and packing density of herring, sprat and
saithe schools have been conducted by multi-beam sonars and echo integrator systems.
Relationships between the reflected echo energy, the estimated school biomass and the school
dimensions were established. The relationships seems quite similar for the three species and
rather independent of the size of the fish. Seasonal and regional differences in schooling behaviour
of herring were detected. School dimension-to-school biomass conversion may be a
useful method for abundance estimation of pelagic species, and also for biomass measurements
in capture situations.