Premium
Acoustic ontogeny of a teleost
Author(s) -
Horne J. K.
Publication year - 2008
Publication title -
journal of fish biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.672
H-Index - 115
eISSN - 1095-8649
pISSN - 0022-1112
DOI - 10.1111/j.1095-8649.2008.02024.x
Subject(s) - biology , allometry , ontogeny , rainbow trout , fish <actinopterygii> , anatomy , zoology , target strength , otolith , intensity (physics) , ecology , fishery , physics , genetics , quantum mechanics
The influence of growth on the intensity and variability of acoustic echoes from individuals and groups of a teleosts was quantified using Donaldson trout (rainbow–steelhead hybrid) Oncorhynchus mykiss . Fish growth was linear in total length ( L T ) and quadratic in mass. Dorsal swimbladder area increased exponentially with L T . Allometric growth ratio ( i.e. k ) values of swimbladder length linearly increased with L T . Average swimbladder volumes occupied 3–6% of fish body volume and increased exponentially with L T . The aspect angle that resulted in the maximum average acoustic intensity from the group shifted from 80 to 86° through the experimental period. Mean echo intensities increased at both 38 and 120 kHz as mean L T increased. Predicted echo intensities at 38 kHz exceeded that at 120 kHz at L T <150 mm but were less than that predicted at 120 kHz at L T >280 mm. Generalized additive mixed models using L T , swimbladder angles and lateral elongation ratios of fish bodies were better predictors of echo intensities than L T alone.