What can otolith examination tell us about the level of perturbations of Salmonid fish from the Kerguelen Islands?

Morat, Fabien; Betoulle, Stéphane; Robert, M.; Thailly, A. F.; Biagianti-Risbourg, S.; Lecomte-Finiger, R.

doi:10.1111/j.1600-0633.2008.00313.x

Cited by 29 publications

(23 citation statements)

References 23 publications

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“…The discrimination is a function of the species (S. lagocephalus, S. aiensis, S. sarasini). For each species, the outline of one pair of otoliths is illustrated, but it is not necessarily representative of all otolith shapes of the group to which it belongs Morat et al 2008). The clear discrimination of the three species suggests that genetic effects control the overall otolith shape at a species level.…”

Section: Discussionmentioning

confidence: 99%

“…Moreover, life history during ontogeny may also affect the otolith shape (Anken et al 1998). Life in different environments for specimens of the same species affects otolith shape (Morat et al 2008), enabling the discrimination of different ecotypes.…”

Section: Discussionmentioning

confidence: 99%

“…Given the abundance of studies, the shape of the otolith would appear to be an ideal marker for fish populations (Smith 1992;Campana and Casselman 1993;Tracey et al 2006;Morat et al 2008). Otolith shape has long been known to be species specific (L' Abbé-Lund 1988;Aguirre and Lombarte 1999;Parmentier et al 2001) and less variable in growth than fish growth, presumably because of the fact that otoliths are organs contributing to audition and balance (Campana and Casselman 1993;Popper et al 2005).…”

Section: Introductionmentioning

confidence: 98%

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Otolith shape analysis for three Sicyopterus (Teleostei: Gobioidei: Sicydiinae) species from New Caledonia and Vanuatu

Lord

Morat²,

Lecomte-Finiger

et al. 2011

Environ Biol Fish

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Otolith shape analysis has been used in a number of studies as an inexpensive and powerful method for categorising fish in individual stocks. Elliptical Fourier analysis was used on three different amphidromous Sicyopterus species. Sicyopterus lagocephalus is a widespread species while the other two have a limited distribution area, Sicyopterus aiensis being endemic to Vanuatu, and Sicyopterus sarasini to New Caledonia. Both endemics live in sympatry with the widespread species. The otolith shape of all fish sampled was a clear species differentiator, thereby demonstrating that otolith shape is species-specific. At an intraspecific level there are different river populations within samples from Vanuatu, indicating a western group and an eastern "central" group.These results are congruent both for the endemic species, S. aiensis and for the cosmopolitan species. Finally, we found that, for S. lagocephalus, the cosmopolitan species, New Caledonian samples are close to western Vanuatu samples, the latter two being well differentiated from the eastern "central" Vanuatu samples. The explanation for these results may lay either in the influence of environmental factors on the otolith shape, or in the influence of common early life history thus reflecting genetic factors, or a combination of both.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

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Otolith shape analysis for three Sicyopterus (Teleostei: Gobioidei: Sicydiinae) species from New Caledonia and Vanuatu

Lord

Morat²,

Lecomte-Finiger

et al. 2011

Environ Biol Fish

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“…The occurrence of such inclusions was clearly demonstrated in several fish such as the European eel (Bowen Ii et al, 1999;Brown and Severin, 1999;Tomas and Geffen, 2003;Tzeng et al, 2007;Jessop et al, 2008;Morat et al, 2008). Chemical composition of vaterite inclusions in the otoliths were showed to be significantly different from the aragonite matrix as, fewer Sr:Ca and Ba:Ca ratios were measured in vaterite crystal than in aragonite of European and American eel otoliths (Jessop et al, 2008;Tzeng et al, 2007).…”

Section: Simultaneous Use Of Strontium and Barium To Avoid Vaterite Dmentioning

confidence: 90%

Simultaneous use of strontium:calcium and barium:calcium ratios in otoliths as markers of habitat: Application to the European eel (Anguilla anguilla) in the Adour basin, South West France

Tabouret

Bareille

Claverie

et al. 2010

Marine Environmental Research

135

154

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Sr:Ca and Ba:Ca ratios in water from the Adour estuary show a clear relationship with the salinity of the surrounding water for salinities <20, while ratios are almost constant above this level of salinity. A positive relationship was observed for the Sr:Ca ratio, whereas it was inverse for the Ba:Ca ratio. These two elemental ratios were measured in the otoliths of the European eels (Anguilla anguilla L.) using femtosecond laser ablation linked to an ICP-MS (fs-LA-ICP-MS). There was a direct relationship between the elemental ratios recorded in eel otoliths and those found in water from fresh and marine areas, suggesting that Sr:Ca and Ba:Ca ratios in eel otoliths can be used as markers of habitat in this estuary. Continuous profiling allowed the determination of three behaviour patterns in terms of habitat: freshwater, estuary and migratory individuals. Finally, the above results support the simultaneous use of both ratios for a better understanding of the migratory contingents and also as a relevant method to avoid a misidentification of environmental migratory history due to the presence of vaterite crystal in the otolith matrix.

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“…The otoliths generally remain stable over time, unlike other calcifi ed structures like scales (Mérigot et al 2007, Morat et al 2008. The analysis of otoliths characteristics offers a unique potential for reconstitution, a temporal resolution ranging from days to years, at a time, the environmental parameters effects and traits of fi sh life (Fablet 2012).…”

Section: Introductionmentioning

confidence: 99%

Stock discrimination of two insular populations of Diplodus annularis (Actinopterygii: Perciformes: Sparidae) along the coast of Tunisia by analysis of otolith shape

Trojette

Faleh

Fatnassi

et al. 2015

Acta Ichthyol. Piscat.

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Background. The annular seabream, Diplodus annularis (Linnaeus, 1758), is the most common sparid fi sh in the Mediterranean Sea. This species is widespread in Tunisia. Despite their economic importance, due to their excellent white and delicate fl esh (demersal fi sh) and their signifi cant size, few studies have hitherto focused on stock discrimination and on the fi sheries management. The goal of this research was to evaluate the stock structure of D. annularis for two Tunisian insular populations based on the otolith shape, using different statistical approaches. Materials and methods. The specimens of Diplodus annularis were collected during fi ve months ranging from May through September 2014 at two sites: Djerba and Kerkennah. In total, 120 fi sh were collected from the two sites: 60 specimens of each population (30 males and 30 females) and were included in different statistical analyses. The Fourier coeffi cients were determined to evaluate the degree of similarity in the otoliths and detect the reciprocal variability. Results. By comparing the two studied populations, we revealed statistical signifi cant differences, an asymmetry (left-right), of otoliths (P < 0.05). In the same population, symmetry (left-right) was detected for the males, females of Kerkennah, and females of Djerba. However, an asymmetry was detected only for the males of Djerba. Also, sexual dimorphism was observed only for the Djerba population. Conclusion. The comparison of the otolith morphology of the two populations showed a clear difference in shape and a left-right asymmetry of otoliths. This asymmetry indicates that the two populations belong to different stock of fi sh. The stocks characterization is considered as an important tool for fi sheries management. Further studies are necessary to determine the origin of the otolith shape differences and whether they are related only to environmental conditions or a genetic basis may also be responsible.

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What can otolith examination tell us about the level of perturbations of Salmonid fish from the Kerguelen Islands?

Cited by 29 publications

References 23 publications

Otolith shape analysis for three Sicyopterus (Teleostei: Gobioidei: Sicydiinae) species from New Caledonia and Vanuatu

Otolith shape analysis for three Sicyopterus (Teleostei: Gobioidei: Sicydiinae) species from New Caledonia and Vanuatu

Simultaneous use of strontium:calcium and barium:calcium ratios in otoliths as markers of habitat: Application to the European eel (Anguilla anguilla) in the Adour basin, South West France

Stock discrimination of two insular populations of Diplodus annularis (Actinopterygii: Perciformes: Sparidae) along the coast of Tunisia by analysis of otolith shape

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