265 Works

Influence des facteurs environnementaux sur la structure des peuplements ichtyologiques de l’île de La Réunion (Sud-Ouest de l’océan Indien)

Mathieu Pinault, Pascale Chabanet, Nicolas Loiseau, Patrick Durville, René Galzin & Jean-Pascal Quod
Ce travail, réalisé sur des habitats récifaux et non récifaux de l’île de La Réunion, constitue la première étude sur la structure de l’ichtyofaune côtière à l’échelle de l’île. Il comprend la caractérisation des peuplements,l’identification des patrons spatiaux de distribution des taxons et l’analyse des interactions entre lesvariables ichtyologiques et environnementales. L’échantillonnage a été réalisé par recensement visuel sur vingt secteurs répartis autour de l’île. Soixante-quatre familles et 406 espèces ont été recensées. À chaque...

New record of the bothid flounder Parabothus taiwanensis (Bothidae, Pleuronectiformes) from the southern Pacific Ocean (Vanuatu Archipelago) with description of a new diagnostic character

Elena Voronina & Romain Causse
A finding of the rare species of bothid flounder Parabothus taiwanensis in the Vanuatu Archipelago, previously known only from the East China Sea, is reported. The distribution of this species can now be extended considerably to the south-east, to the Coral Sea, with depth to 250 m. Illustrated descriptions of specimens are provided, and a new character, the perforation of the bases of dorsal and anal fin membranes, can be added to the diagnosis of...

Resorption of scales in Atlantic salmon (Salmo salar) during its anadromous migration: a quantitative study

Adnane Kacem, Jean-Luc Baglinière & François J. Meunier
Resorption processes in the scales of Atlantic salmon, during its anadromous migration are known since 1935, but have never been quantified. In fact, the ellipsoid form of the ascending salmon scale resorbs into an irregular highly deformed shape in spawning salmon. The aim of this study is to quantify the changes of both anterior and posterior scale areas using image analysis techniques. Salmon scales were sampled taking into account the sex and sea age of...

Aspects qualitatifs et quantitatifs de l’alimentation de Clarias buettikoferi (Siluriformes ; Clariidae) dans la forêt des marais Tanoé-Ehy (Côte d’Ivoire)

Yao Aristide Konan, Mamadou Bamba & Tidiani Koné
L’alimentation du poisson-chat Clarias buettikoferi Steindachner, 1894 a été étudiée dans la forêt des marais Tanoé-Ehy (Côte d’Ivoire). Les poissons ont été capturés mensuellement à l’aide de filets verveux et de filets maillants entre mars 2012 et février 2013. Au total, 208 poissons ont été capturés, de longueur standard et de poids variant entre 90 mm et 260 mm LS et entre 7,3 g et 132 g, respectivement. L’indice de vacuité général était de 14,4%,...

On the presence of Trachinus pellegrini (Trachinidae) in the Canary and Cape Verde Islands (north-eastern Atlantic)

José A. González, José F. González-Jiménez, Raül Triay-Portella, Sebastián Jiménez, Gustavo González-Lorenzo & Manuel Biscoito
Trachinus pellegrini Cadenat, 1937 is recorded for the first time from the Canaries, which represents the northernmost limit of the species distribution. Morphological differences between adult and juvenile specimens are given. The presence of this species in the Cape Verde Islands is also confirmed.

Emmelichthys marisrubri, a new rover from the southern Red Sea (Teleostei: Emmelichthyidae)

Ronald Fricke, Daniel Golani & Brenda Appelbaum-Golani
Emmelichthys marisrubri sp. nov. is described from three specimens, which were trawled off Eritrea in the southern Red Sea. The species is characterised by the spinous and soft-rayed portions of dorsal fin separated by a gap containing four short isolated spines, which are protruding over the dorsal surface of the body; depth of body 16.5-20.2% SL; lateral-line scales 80-83; dorsal-fin spines 12-13; dorsal-fin soft rays 8; pectoral-fin rays 18-20, total gill rakers 26-31. A revised...

Results of the research expedition Biaçores 1971. Fishes and list of stations

Armando J. Almeida & Manuel Biscoito
The fishes collected during the Biaçores research expedition on board R/V Jean Charcot, in October/November 1971, were studied and a list of stations given. In all, 861 specimens, belonging to 98 species and 48 families from 79 stations, seven of which in the high seas and 72 around or on the coast of the islands of the Azores, were identified. The presence of Rajella bathyphila (Holt & Byrne, 1908) and Arnoglossus imperialis (Rafinesque, 1810) is...

Observations on two live specimens of Trachipterus arcticus (Lampriformes: Trachipteridae) from the Azores

Timo Moritz, Dewicynthia Stümer, Kirsten Jakobsen & Joachim Jakobsen
During a 950 m depth submarine-dive South of Pico Island (Azores) an adult Trachipterus arcticus (Brünnich, 1788) was observed for about 50 seconds. Additionally, a small specimen of the same species with some larval characters was observed near to the surface in the harbour of Horta (Faial Island, Azores). This specimen was caught and observed for 45 minutes in an aquarium. We are reporting here the respective observations on live colouration, external characters, swimming and...

Composition et variations nycthémérales des peuplements ichtyologiques des petits fonds mixtes du golfe d’Annaba, Algérie

M. Salah Hannachi, Farid Derbal, M. Sofiane Boubekeur & Mohamed Hichem Kara
La composition et les variations nycthémérales du peuplement ichtyologique des petits fonds mixtes (< 1,5 m) du littoral d’Annaba (Algérie) ont été étudiées de mars 2011 à mars 2012. Dans trois sites côtiers conti-gus, situés à l’Ouest du golfe d’Annaba (Aïn-Achir, Belvédère et La Caroube), 26 pêches expérimentales ont été réalisées de jour (13) comme de nuit (13), à l’aide d’une senne de plage (L: 10 m, H: 1 m, maille: 4 mm). Les indices...

Evidence of late migrant smolts of Atlantic salmon (Salmo salar) in the Loire-Allier System, France

Hélène Imbert, Patrick Martin, Jocelyn Rancon, Vincent Graffin & Sylvie Dufour
Smolts of Atlantic salmon Salmo salar of the Loire-Allier system have to perform an exceptional distance of 900 km to reach the ocean from the upstream spawning grounds, while being subjected to connectivity disruption induced by the presence of dams as well as fluctuating climatic conditions. In order to successfully perform their marine entry, smolts should reach the estuary within a limited suitable period. This study concerns smolt emigration dates from upper Allier, and arrival...

First record of the East Asian fourfinger threadfin, Eleutheronema rhadinum (Jordan & Evermann, 1902), from Zhenjiang, China

Liqiang Zhong, Jiang Wang, Minghua Wang, Daming Li, Shengkai Tang & Xiaohui Chen
A single specimen (219.6 mm in standard length) of East Asian fourfinger threadfin (Perciformes: Polynemidae), Eleutheronema rhadinum (Jordan & Evermann, 1902), was captured with gillnet in Yangtze River estuary near Yangzhong County, Zhenjiang, China, on 30 October 2018. It is the first record of E. rhadinum in freshwaters of the Yangtze River Estuary.

Three new records of Gobiidae from Malta with morphology, colouration and identification of the smallest known juveniles of two small gobiid speciesof two small gobiid species

Marcelo Kovačić, Juan Jose Bonello & Julian Evans
Individuals of small juvenile gobies, some of them just 10 mm long, were collected during a study on infralittoral cobble bed fauna around the Maltese Islands between July and September 2011. These represent the first records of three gobiid species for Malta, including Gobius couchi Miller & El Tawil, 1974 and the smallest known juveniles of Millerigobius macrocephalus (Kolombatović, 1891) and Zebrus zebrus (Risso, 1827). Morphology and colouration, including diagnostic features and photographs, are provided...

Histological distinction between immature and regenerating females and its effect on maturity ogive estimation in three tropical hermaphroditic groupers

Thierry Brulé & Teresa Colás-Marrufo
Accuracy of the muscle bundle criterion is analysed to distinguish regenerating ovaries from immature ones in three commercially important hermaphroditic grouper species from the southern Gulf of Mexico: red grouper Epinephelus morio (Valenciennes, 1828); black grouper Mycteroperca bonaci (Poey, 1860); and gag Mycteroperca microlepis (Goode & Bean, 1880). The presence of muscle bundles in ovaries is a generally accurate criterion for distinguishing between regenerating and immature females in these species. However, reproductively inactive specimens could...

Validity of a poorly known western Pacific scorpionfish (Scorpaenidae), Neomerinthe pallidimacula (Fowler, 1938)

Hiroyuki Motomura, Romain Causse & Philippe Béarez
A poorly known scorpionfish, Neomerinthe pallidimacula, previously known only from the holotype, is redescribed on the basis of the holotype from the Philippines and an additional specimen from the Wallis and Futuna Islands. This species is distinguished from its congeners in the Indo-Pacific Ocean by having a ventrally directed anterior lacrimal spine, the posterior margin of the maxilla reaching to a vertical through the posterior margin of the orbit, a well-developed symphysial knob, a well-developed...

Quelques aspects de la biologie de la reproduction de Schilbe multitaeniatus (Siluriformes, Schilbeidae) de la rivière Rembo Bongo (Gabon)

Jean Félicien Liwouwou, Simon Ahouansou Montcho, Elie Montchowui, Jean Daniel Mbega & Philippe Lalèyè
Afin de gérer durablement l’espèce Schilbe multitaeniatus (Pellegrin, 1913) et réaliser à terme son élevage, une étude de quelques aspects de la biologie de sa reproduction a été conduite dans la rivière Rembo Bongo au Gabon, de juillet 2010 à juin 2011. Les échantillons étudiés sont issus d’une pêche expérimentale réalisée dans deux stations (Mafoumi et Moanda) au moyen de filets dormants. Les résultats ont montré que le sex-ratio était en faveur des femelles (χ²...

Age and growth of Muraena helena (Muraenidae) from the north coast of Tunisia

Balkis Sallami, Philippe Béarez & Mohamed Ben Salem
The age and growth of the moray eel (Muraena helena) from the north coast of Tunisia were determined from otolith growth ring studies. A total of 221 specimens were used. Total length (TL) and weight (TW) ranged from 31 to 100 cm and from 45.4 to 2311.9 g, respectively. The transverse section of the otoliths observed under transmitted light proved to be a useful method for ageing M. helena. Marginal increment analysis was used to...

New biological data on Fistularia commersonii in the central Mediterranean Sea

Luca Castriota, Manuela Falautano, Pietro Battaglia, Alberto Oddo & Franco Andaloro
Preliminary data on age, growth and diet of bluespotted cornetfish Fistularia commersonii Rüppell, 1838 (Fistulariidae) in the central Mediterranean Sea are provided. In the study area, this invasive Lessepsian fish showed piscivorous behaviour, focusing mainly on labrids, clupeids and sparids. Prey composition suggests that bluespotted cornetfish explores various habitats for hunting. Prey fishes were mainly juveniles and their size showed positive correlation with predator size. Estimated by vertebrae readings, ages of bluespotted cornetfish, having sizes...

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