First record of Batrachoides surinamensis (Bloch &amp;amp; Schneider, 1801) and Canthidermis maculata (Bloch, 1786) (Pisces: Teleostei) from Rio Grande do Norte, northeastern coast of Brazil

Triggerfish are widely distributed in tropical waters where they play an important ecological role. The black triggerfish Melichthys niger may be the dominant species around oceanic tropical islands, whereas pelagic triggerfish, such as the ocean triggerfish Canthidermis sufflamen, can assemble around fish aggregating devices (FADs) where they are a common bycatch of tuna fisheries. In this study we combined acoustic and optical recordings to provide the first in situ target strength (TS) measurement of black and ocean triggerfish. Data were collected in the Archipelago of Fernando de Noronha off north-east Brazil. The mean TS of a 27.8-cm-long black triggerfish at 70 and 200kHz was –39.3dB re 1m2 (CV=14.0%) and –38.9dB re 1m2 (CV=14.4%) respectively. The mean TS values of ocean triggerfish (with a size range of 39–44cm) at 70 and 200kHz were –36.0dB re 1m2 (CV=15.7%) and –33.3dB re 1m2 (CV=14.0%) respectively. This work opens up the field for acoustic biomass estimates. In addition, we have shown that TS values for ocean triggerfish are within the same range as those of small tunas. Therefore, acoustic data transmitted from FADs equipped with echosounders can introduce a bias in tuna acoustic biomass estimation and lead to increased rates of bycatch.

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In situ target strength measurement of the black triggerfish Melichthys niger and the ocean triggerfish Canthidermis sufflamen

Salvetat

Lebourges‐Dhaussy

Travassos

et al. 2020

Mar. Freshwater Res.

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First Specimen-based Records of Canthidermis macrolepis (Tetraodontiformes: Balistidae) from the Pacific Ocean and Comparisons with C. maculata

2020

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Canthidermis macrolepis (Boulenger, 1888) is newly recorded from Japan and Micronesia on the basis of nine specimens (206.9-349.8 mm SL), having been previously reported from the northwestern Indian Ocean and northern South China Sea (the latter based solely on DNA barcoding). The species is probably widespread throughout the Indo-West Pacific region but has been confused with Canthidermis maculata (Bloch, 1786). Detailed morphological comparisons of both species resulted in the following differences being recognized between them: numbers of body scale rows [38-41 (modally 40) in C. macrolepis vs. 40-49 (44) in C. maculata], second dorsal-fin rays [25-27 (26) vs. 22-26 (24)], anal-fin rays [22-24 (23) vs. 20-23 (21)] and pectoral-fin rays [14-16 (15) vs. 13-15 (14)]. Sequences of the mitochondrial DNA COI gene determined from the presently-reported specimens of C. macrolepis, which also differed in color from similarly sized C. maculata, having a uniformly grayish body without spots, were also compared with congeners. The Japanese standard name "Bouzu-mongara" is newly proposed for C. macrolepis.

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First record of Batrachoides surinamensis (Bloch & Schneider, 1801) and Canthidermis maculata (Bloch, 1786) (Pisces: Teleostei) from Rio Grande do Norte, northeastern coast of Brazil

Cited by 2 publications

References 10 publications

In situ target strength measurement of the black triggerfish Melichthys niger and the ocean triggerfish Canthidermis sufflamen

In situ target strength measurement of the black triggerfish Melichthys niger and the ocean triggerfish Canthidermis sufflamen

First Specimen-based Records of <i>Canthidermis macrolepis</i> (Tetraodontiformes: Balistidae) from the Pacific Ocean and Comparisons with <i>C</i>. <i>maculata</i>

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