Nicolas Andrialovanirina

Introduction The genus Pseudotolithus , commonly called croaker, is represented by the three main species found in West African waters. Methods In total, 934 individuals were sampled in 8 locations in Senegal, Ghana, and Nigeria. Several tests identified using sectioned otolith as the best method for determining the croakers' age. The marginal inc...

This paper presents a dataset of 3D sagittal left otolith meshes from 339 individual red mullet (Mullus barbatus). These immature specimens were collected from 17 geographical areas covering the entire Mediterranean Sea. Measured biological parameters were: fish total length (TL ± 1 mm, range from 125 to 238 mm), total weight (W ± 0.1 g, range from...

The shape of a fish's otolith varies according to its environment, genetics and life stage. To be able to analyse these shapes, standardisation is a crucial step. In this study, a protocol for standardising and aligning 3D reconstructions of the otolith was proposed, based on the extraction of Spherical Fourier Descriptors. This protocol was approv...

In the context of sustainable fishing, amidst global change, prior knowledge of the geographic boundaries of each studied population is required. In this study, innovative automated analysis of the three-dimensional (3D) shape of red mullet otoliths from the Mediterranean Sea was compared to conventional two-dimensional (2D) analysis. This new thre...

This study explores the ecological diversity of otoliths in Mugil cephalus by analysing data from 190 individuals collected at different sites, including the Porto Novo lagoon, the Cotonou lagoon and Lake Nokoué. The results revealed significant differences in otolith morphology, showing significant associations with the biological characteristics...

The importance of this study lies in the in-depth exploration of the ecological diversity of otoliths in Elops lacerta, based on the analysis of data from 260 individuals collected from various sites, including the Porto Novo lagoon, the Cotonou lagoon, Lake Nokoué, and the Atlantic coast in southern Benin. The results highlight significant variati...

The otolith is a calcified structure located in the inner ear of fish, commonly used to estimate their age. Its shape can be utilized to differentiate between fish populations. Otoliths from 22 different species have been collected in the English Channel and North Sea regions. By employing 3D images of otoliths, it has become possible to identify t...

Knowledge of the spatial structuring of stocks is essential to study the dynamics of fish populations, and thus to manage fisheries. In this study, sagittal otolith shape was used to understand the stock structures of populations of the main commercial species caught around la réunion island. A total of 1091 individuals, belonging to nine species o...

Fisheries management is generally based on age structure models. Thus, fish ageing data are collected by experts who analyze and interpret calcified structures (scales, vertebrae, fin rays, otoliths, etc.) according to a visual process. The otolith, in the inner ear of the fish, is the most commonly used calcified structure because it is metabolica...

Sagittal otolith shape analysis is one of the most widespread techniques worldwide to discriminate fish stock units, as this proxy integrates both environmental and genetic factors. All previous otolith shape studies have been carried out using two-dimensional (2D) images, a partial representation of the whole shape of the otolith. However, prior t...

Measuring fish length is useful for exploring size structure of catches and fishing effects on marine resources. However manually measuring large numbers of individuals requires time-consuming manipulations, which are hardly operational in the context of tropical small-scale fisheries. To overcome this limitation, we developed a method to automatic...