254 Works

Morphological and histological data on the structure of the lingual toothplate of Arapaima gigas (Osteoglossidae; Teleostei)

François J. Meunier, Paulo M. Brito & Maria Eduarda C. Leal
The pirarucu, Arapaima gigas (Osteoglossidae) has a basibranchial toothplate that supports a great density of teeth and helps the food transfer from the oral cavity towards the oesophagus. The lingual teeth appear early during ontogeny of the hyoid and branchial skeleton. On the basibranchial toothplate the teeth are closely set but without any connection, contrary to the “coalesced teeth”. The lingual teeth are 4 mm long and 1.0 to 1.5 mm wide; they are constituted...

Melanic hyper-pigmentation in the genus Lepidion (Gadiformes: Moridae)

Rafael Bañón, Juan Carlos Arronte, Wolf Isbert, Germán Coscelli & Francisco Sánchez
Two cases of melanic hyper-pigmentation in Lepidion lepidion are reported from two localities in Spanish Atlantic waters. A bibliographic search revealed the occurrence of this chromatic anomaly in two other Lepidion specimens, the first of them reported in the late 19th century. Macroscopically, the colour abnormality was characterized by the presence of numerous cutaneous irregular dark patches over the head, body and fins. Microscopically, melanosis corresponds to hyperplasia of dermal melanophores. Although the cause of...

Relations allométriques entre la longueur du poisson et la taille de l’otolithe chez trois anguilliformes des côtes du nord de la Tunisie (Méditerranée centrale)

Balkis Sallami, Philippe Béarez & Mohamed Ben Salem
Un échantillon comprenant 36 spécimens de congre bec-fin (Gnathophis mystax), 198 de congre d’Europe (Conger conger) et 61 de murène de Méditerranée (Muraena helena) a été sélectionné parmi les captures faites à l’aide de palangres ou de chaluts sur la côte nord-est de Tunisie, entre décembre 2008 et décembre 2010. Chez les deux espèces de Congridae, G. mystax et C. conger, la masse des otolithes et la longueur du poisson sont fortement liées par une...

Étude de l’infestation par des larves d’Anisakidés de trois espèces de poissons d’intérêt économique en Mauritanie

Sidi Khlifa, Elisabeth Faliex, Pierre Sasal & René Galzin
Les enjeux économiques liés à la Zone économique exclusive mauritanienne en ce qui concerne la pêche sont très importants. Parmi ceux-ci, figure la possibilité d’exporter du poisson d’une qualité sanitaire irréprochable vers l’Europe. Cependant, certaines des espèces exportées sont susceptibles d’héberger des parasites de la famille des anisakidés (nématodes), pouvant créer un risque sanitaire pour le consommateur. Nous nous sommes intéressés à trois de ces espèces, la sardine, Sardina pilchardus, le chinchard, Trachurus trachurus et...

Reproduction et maturation des gonades de Sardina pilchardus dans le golfe d’Annaba (Nord-Est algérien)

Fatima Zohra Bouhali, Shahnaz Lechekhab, Souad Ladaimia, Assia Bedaira, Rachid Amara & A. Borhane Djebar
la reproduction de Sardina pilchardus (Walbaum, 1792)a été étudiée entre juillet 2011 et juin 2012 dans le golfe d’annaba (Nord-est algérien). le sex-ratio était globalement en faveur des femelles (1,26 : 1 ; χ² = 25,77). Sur un total de 2 266 spécimens échantillonnés, 1 076 étaient des femelles (47,48%), 853 des mâles (37,64%) et 337 des immatures (14,88%). Les immatures étaient mieux représentés dans les petites classes de taille, comprises entre 9 et 11...

The West Pacific Neobythites bimarginatus (Ophidiidae) recorded from off Madagascar

Jørgen G. Nielsen & Franz Uiblein
In 2010, the French expedition “Atimo Vatae” caught a specimen of the ophidiid genus Neobythites off southern Madagascar at a depth of 285 m. The specimen is different from all the 12 species known from the westernmost Indian Ocean, but it fits the diagnosis of N. bimarginatus Fourmanoir & Rivaton, 1979, one of the 30 Neobythites species known from the East Indian and West Pacific Oceans. N. bimarginatus is unique by having the distal and...

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...

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.

Age, growth and reproduction of the endangered jewelfish Hemichromis bimaculatus (Cichlidae) in the valley of Oued Righ (South-eastern Algeria)

Rabie Guezi & M. Hichem Kara
Age, growth and reproduction of 493 jewelfish Hemichromis bimaculatus Gill, 1862 in the valley of Oued Righ (Algeria) were studied from December 2010 to December 2011. The total length and weight of the individuals ranged from 21 to 107 mm and 0.20 to 14.9 g, respectively. Monthly follow-up of the scale marginal growth allowed identifying only one growth stop annulus per year, occurring in April. Back-calculations of total length-at-age permitted to determine that the population...

Shore fishes of French Polynesia

Siu G.; Bacchet P.; Bernardi G.; Brooks A.J.; Carlot J.; Causse R.; Claudet J.; Clua E.; Delrieu-Trottin E.; Espiau B.; Harmelin-Vivien M.; Keith P.; Lecchini D.; Madi Moussa R.; Parravicini V.; Planes S.; Ponsonnet C.; Randall J.E.; Sasal P.; Taquet M.; Williams J.T.; Galzin R.

Histology of ganoid scales from the early Late Cretaceous of the Kem Kem beds , SE Morocco : systematic and evolutionary implications

François J. Meunier, René-Paul Eustache, Didier Dutheil & Lionel Cavin
In 1963, N. Tabaste described disconnected fossil material from the Saharan Cenomanian site of Gara Tabroumit, and especially three sets of isolated scales that she all referred to the genus Lepidotes. Although the rhomboid shape and overall morphology of one set of scales allow regarding them as ganoid scales, the external aspect of the ganoine is not as regularly smooth and shiny as it is in most lepidosteoid scales commonly referred to ginglymodian (“semionotiform”) fishes....

Two southeastern Atlantic records of the rare largetooth cookiecutter shark, Isistius plutodus (Selachii, Squaliformes, Dalatiidae)

Matthias Stehmann & Efim I. Kukuev
Two more females of the very rare pelagic dalatiid shark Isistius plutodus Garrick & Springer, 1964 are reported as the first records from the open SE Atlantic over the Walvis Ridge. These are described in detail with their morphometrics and internal meristics, and illustrated with photographs. All 10 specimens so far published after the holotype have been tracked regarding their whereabouts, with the result that only five of them (at AMS, MOVI, ZMH, ZUEC) do...

Is adult translocation a credible way to accelerate the recolonization process of Chondrostoma nasus in a rehabilitated river?

Michaël Ovidio, Céline Hanzen, Vincent Gennotte, Johan Michaux, Jean-Philippe Benitez & Arnaud Dierckx
The decline of the patrimonial rheophilic nase, Chondrostoma nasus (Linnaeus, 1758) populations was mainly caused by construction of dams and hydroelectric power-plants, together with the straightening and artificialization of the river banks and water pollution. In this study, we tested the hypothesis whether the translocation of few adult nase individuals from a river stretch to another upstream may be a credible way to accelerate the recolonization process of the species in the Amblève River (Southern...

Reproductive biology of Lophius budegassa (Lophiidae) in the North Aegean Sea

C.C. Yigin, A. Ismen & M. Arslan
The reproductive biology of black-bellied anglerfish, Lophius budegassa Spinola, 1807, was described for the first time in the Saros Bay, in the North Aegean Sea, between September 2006 and September 2008. A total of 862 specimens (15.7-107.0 cm) was sampled. Sex-ratio, spawning period and length at first sexual maturity were determined. The F:M sex-ratio was close to 1.5. Using gonadosomatic index and gonadal macroscopic observation, the spawning period was estimated to occur between December and...

Revision of the Pelvicachromis taeniatus-group (Perciformes), with revalidation of the taxon Pelvicachromis kribensis (Boulenger, 1911) and description of a new species

Anton Lamboj, Daniela Bartel & Emiliano Dell’Ampio
Sixty-six specimens of seven populations of the Pelvicachromis taeniatus-group are compared and examined, using molecular and anatomical-morphological methods as well as coloration patterns. Accordingly, the taxon P. taeniatus is restricted to populations from Benin and Nigeria. For most populations from Cameroon the old taxon P. kribensis is revalidated and specimens from the Wouri River are described as a new species, P. drachenfelsi sp. nov. Species diagnosis is based on molecular characters and coloration patterns –...

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