Investigating the origin of vagrant dusky groupers, Epinephelus marginatus (Lowe, 1834), in coastal waters of Réunion Island

Reid, Kerry; Crochelet, Estelle; Bloomer, Paulette; Hoareau, Thierry B.

doi:10.1016/j.ympev.2016.07.012

Cited by 11 publications

(9 citation statements)

References 34 publications

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“…Ciguateric groupers showed a different profile of distribution, as exposed above, which may be explained for a sedentary and very territorial behaviour of these fish (Reid et al, 2016). Furthermore, it must be considered the presence of an algae bloom of G. caribaeus occurred in October 2016 in El Hierro (Soler-Onís et al, 2016) and the rate of CTX bioaccumulation in fish tissue (Lehane and Lewis, 2000;Banner et al, 1966), what could explain that this certain island represents the highest percentage of CTX positive groupers in the Canary Archipelago (90%) in this period of study (Table 3).…”

Section: Influence Of the Period Of Fishingmentioning

confidence: 78%

“…Due to the biological difference between species (Reid et al, 2016;Šegvić-Bubić et al, 2016), each species weight data were analyzed separately using Mann-Whitney (M-W)/Wilcoxon non-parametric tests (Table 2), demonstrating that the median value of weight for fish which showed CTX-like toxicity was significantly higher than the median weight of negative fish, both in amberjack (27 Kg vs. 20 Kg; p < 0.001) and grouper species (22.5 Kg vs. 21.1 Kg; p = 0.013, respectively). In both species, CTX toxicity was more frequently observed in larger specimens.…”

Section: Influence Of the Fish Weightmentioning

confidence: 99%

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Predictive score and probability of CTX-like toxicity in fish samples from the official control of ciguatera in the Canary Islands

Sanchez‐Henao

García‐Álvarez

Fernández

et al. 2019

Science of The Total Environment

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This research identifies factors associated with the contamination by ciguatoxins (CTXs) in a population of fish and proposes a predictive score of the presence of CTXlike toxicity in amberjack samples from the official control program of ciguatera in the Canary Islands of the Directorate-General (DG) Fisheries (Canary Government). Out of the 970 samples of fish studied, 177 (18.2%) samples showed CTX-like toxicity. The fish were classified according to the species, amberjack (Seriola dumerili and S. rivoliana) (n = 793), dusky grouper (Epinephelus marginatus) (n = 145) and wahoo (Acanthocybium solandri) (n = 32). The data were separated by species category and statistically examined, resulting in 137 (17.3%) amberjack and 39 (26.9%) grouper samples showing CTX-like toxicity; regarding wahoo species, only 1 toxic sample (3.1%) was found. According to fishing location the contamination rates suggested grouping the

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Section: Influence Of the Period Of Fishingmentioning

confidence: 78%

Section: Influence Of the Fish Weightmentioning

confidence: 99%

Predictive score and probability of CTX-like toxicity in fish samples from the official control of ciguatera in the Canary Islands

Sanchez‐Henao

García‐Álvarez

Fernández

et al. 2019

Science of The Total Environment

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“…NEMC and SEMC are strong coastal currents with maximum core velocity of < 150 cm • s -1 (Voldsund et al 2017), that may act as an oceanographic barrier to larval dispersal. Only episodic events such as cyclones seem to allow in rare cases a connectivity between Madagascar and Reunion Island (Reid et al 2016). In contrast, it seems possible that this population originates from Saint Brandon Rocks, possibly through a stepping-stone population living in Mauritius Island, located about 460 km south-southwest of Saint Brandon, although the species has not yet been recorded from this island.…”

Section: Discussionmentioning

confidence: 95%

First record of the lattice soldierfish, Myripristis violacea (Actinopterygii: Holocentriformes: Holocentridae), from Reunion Island (south-western Indian Ocean)

Bourjon¹,

Fricke²

2019

Acta Ichthyol. Piscat.

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The lattice soldierfish, Myripristis violacea Bleeker, 1851, is recorded for the first time from Reunion Island. An aggregation of 12 individuals was observed and photographed on 12 January 2019 and later on the L'Hermitage reef, located on the west coast of the island. Examination of high-resolution photographs of the largest of these individuals shows that its external morphological characteristics agree well with those reported in the description of the species provided by the last revision of the genus. Studies on regional connectivity make it likely that the Reunion Island population of M. violacea originates from the northern Seychelles Island or Chagos Archipelago via stepping-stone populations. Our observations extend the known distribution of the species to the southernmost island of the Mascarene Archipelago, and extend its known depth range.

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“…Previous population genetic studies of dusky grouper (e.g. De Innocentiis et al, 2001;Maggio, Andaloro & Arculeo, 2006;Buchholz-Sørensen & Vella, 2016;Reid et al, 2016) have been performed only at regional scales; these studies utilized different genetic markers and sampling strategies and found discrete populations. However, there has not yet been a study of dusky grouper population genetic structure at a global scale using both microsatellite and mitochondrial markers.…”

Section: Introductionmentioning

confidence: 99%

Global population genetic structure of the sequential hermaphrodite, dusky grouper (Epinephelus marginatus)

Vaini

Domingues

Ferrette

et al. 2021

Aquatic Conservation

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1. The dusky grouper Epinephelus marginatus is a large epinephelid species that occurs in the eastern and south-western Atlantic and western Indian Oceans. Late maturity, protogynous hermaphroditism, site fidelity, and overfishing have all contributed to its demographic decline.2. Connectivity and demography within a broad sampling of dusky grouper populations throughout its distribution were assessed. To do so, genetic variation at 11 polymorphic microsatellite loci and a partial sequence of the mitochondrial control region (mtCR) were evaluated.3. Two major mtCR lineages with a sequence divergence of 1.6% were found. The magnitude of genetic differentiation for mtCR among north and south Atlantic and Indian Ocean populations was high, with Φ ST = 0.528. 4. D EST and results of discriminant analysis of principal component revealed significant microsatellite genetic differentiation between all collection areas. Significant pairwise D EST showed moderate (0.084) to very great (0.603) differentiation. The effective population size was low for all localities, ranging between 25 (Azores Archipelago) and 311 (Rio Grande do Sul). The overall effective population size was estimated as 299 (confidence interval = 215-412), and there was no evidence of strong or recent bottleneck effects.5. Local and regional genetic structuring among dusky grouper populations is the consequence of the species' site fidelity, distribution across multiple oceanographic boundaries, and probably also of sequential hermaphroditism that contributes to the intensity of random genetic drift.6. The spatial pattern of genetic structuring of dusky groupers is such that fisheries management and conservation of population genetic integrity will have to be pursued at the local and regional scales.

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Investigating the origin of vagrant dusky groupers, Epinephelus marginatus (Lowe, 1834), in coastal waters of Réunion Island

Cited by 11 publications

References 34 publications

Predictive score and probability of CTX-like toxicity in fish samples from the official control of ciguatera in the Canary Islands

Predictive score and probability of CTX-like toxicity in fish samples from the official control of ciguatera in the Canary Islands

First record of the lattice soldierfish, Myripristis violacea (Actinopterygii: Holocentriformes: Holocentridae), from Reunion Island (south-western Indian Ocean)

Global population genetic structure of the sequential hermaphrodite, dusky grouper (Epinephelus marginatus)

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