Reconstructing individual shape histories of fish otoliths: A new image-based tool for otolith growth analysis and modeling

Abstract

a b s t r a c tIn this paper is presented a novel image processing tool for the extraction of geometric information in otolith images. It relies on the reconstruction of individual otolith shape histories from otolith images. Based on the proposed non-parametric level-set representation of otolith shape history, applications to the extraction of growth axes and ring structures in otolith images are first considered. A second category of applications concern the analysis of 2D otolith growth. The potential of the proposed framework is illustrated on real otolith images for various species (e.g., cod, pollock) and discussed with a particular emphasis on the genericity of the approach and on applications such as otolith shape analysis, multi-proxy otolith analysis, otolith modeling.

Otolith fluctuating asymmetry inBoops boops(Actinopterygii, Sparidae) from two marine stations (Bizerte and Kelibia) in Tunisian waters

“…However, in the Kelibia lagoon, the water temperature ranged from 12.6 to 22.8°C, the salinity varied from 35.4‰ in winter to 37.5‰ in summer, and it is mostly polluted with biological and biochemical pollutants that showed rates of variation over the seasons of the year (Boulajfene et al, 2019). Indeed, Fablet et al (2009) declared that temperature is probably the indirect factor most affecting otolith growth. This is because fish species are very sensitive to temperature variations and respond to a change of only 0.03°C (Trojette et al, 2015).…”

Stock discrimination of the bogue, Boops boops (Actinopterygii: Perciformes: Sparidae), from two Tunisian marine stations using the otolith shape

“…Regarding environmental parameters, Fablet et al (2009) mentioned that temperature indirectly affects otolith growth. Indeed, fish species have been known to be very sensitive to a change of only 0.03°C (Trojette et al 2015).…”

Reconstructing individual food and growth histories from biogenic carbonates

“…A single parameter then describes the link between otolith radius and volume. A coupling of our approach with a two-dimensional representation of a biogenic carbonate, as developed by Fablet et al (2009) for otoliths, could help resolve situations where the isomorphic growth assumption does not apply, as found for cod Gadus morhua and whiting Merlangius merlangus otoliths (Fablet et al 2009) and mussel Mytilus edulis shell in some conditions (Alunno-Bruscia et al 2001) .…”