Methodology of the Morphometry Study on Baltic Herring

Jakub Idczak

doi:https://doi.org/10.34808/x55q-sz53_dyr_roz21

Methodology of the Morphometry Study on Baltic Herring

Abstract

Acoustic techniques are used in the estimation of the abundance of Baltic herring. Investigations of the relationship between the Baltic herring individual target strength TS and the total fish length L, significant in the acoustic assessment, demonstrated its de-pendence on the study area location. It motivated the detailed analysis of the relationship between herring from the southern Baltic ICES Subdivisions 24, 25, and 26, in which Poland is responsible for the acoustic herring abundance assessment. The modelling approach, based on the Modal Based Deformed Cylinder Model approximation, was used to study the backscattering. The detailed shape of the body and swim bladder of herring individuals was considered. The article describes the methodology of acquiring data for the model study containing information on the detailed shapes of the bodies and swim bladders of 74 herring individuals obtained in the area of the Polish coastal zone (ICES Subdivision 26).