438 Works

Growth estimation of Merluccius merluccius off the northern coast of Tunisia

Widien Khoufi, Jean-Louis Dufour, Héla Jaziri, Safouène Elfehri, Romain Elleboode, Elise Bellamy, Sadok Ben Meriem, Mohamed Salah Romdhane & Kélig Mahé
Growth parameters of any species are fundamental for biological or dynamic studies. The quality of the estimation for these parameters directly impacts on species stock assessment and, as a consequence, on fisheries management. In order to improve fishery and species stock management, growth analysis, especially by sex, is recommended. In this study, otoliths were used to estimate growth parameters of Merluccius merluccius Rafinesque, 1810. Hake is well-known as being a species in which otolith interpretation...

Effects of a Spirulina platensis-based diet on zebrafish female reproductive performance and larval survival rate

Benjamin Geffroy & Olivier Simon
The zebrafish (Danio rerio) is a valuable laboratory animal model that is used in many research areas. However, little is known about the factors that can affect zebrafish reproduction. To determine the potential benefit of an n-6 fatty acid (FA)-rich alga on zebrafish reproduction endpoints, we investigated the effects of the cyanobacterium Spirulina platensis delivered as sole food for zebrafish broodstock. Compared with a commercial flake diet-fed group (FG), egg production of the S. platensis...

First record of Epinephelus marginatus (Serranidae: Epinephelinae) in the eastern English Channel

Kélig Mahé, Marie-Laure Cochard, Jean-Claude Quéro, Karine Sevin, Nicolas Bailly & Alain Tetard
This is the first record of a Dusky grouper specimen (Epinephelus marginatus, Lowe, 1834), which is essentially a Mediterranean species, in the Eastern English Channel. It has been caught on 10 June 2011 in the Bay of Seine. It measured 66 cm and weighted 5.5 kg. This specimen was a female of 12 years old.

Identification, répartition spatio-temporelle et caractérisation génétique des alevins de Muges ensemencés dans les retenues de barrages tunisiennes

Sami Mili, Nawzet Bouriga, Rym Ennouri, Houcine Laouar & Hechmi Missaoui
L’empoissonnement des barrages par des mugilidés est le principal moyen adopté en Tunisie pour assurer la continuité de la pisciculture continentale. La détermination des périodes d’abondance de certaines espèces revêt une priorité pour la réussite des opérations de récolte des alevins de muges. En effet, la ressemblance entre les alevins de Mugilidae et la dépigmentation de certaines espèces posent un problème pour l’identification des spécimens. Les analyses phylogénétiques ont montré que les populations de muge...

The influence of the Rupununi portal on distribution of freshwater fish in the Rupununi district, Guyana

Lesley S. de Souza, Jonathan W. Armbruster & David C. Werneke
The Guiana Shield region in northern South America has a rich and diverse ichthyofauna with a high degree of endemism. The fauna of this region is shaped not only by the geology of the area but climatic events as well. The Rupununi district of southwestern Guyana is an area where seasonal rainfall floods a vast savanna. During the rainy season, this inundated savanna allows a connection between the Amazon and Essequibo Rivers that provides the...

Range extension of Piabucus dentatus (Koelreuter, 1763) for the Pindaré River drainage, Mearim River basin, Brazil (Characiformes: Iguanodectinae)

Erick C. Guimarães, Felipe P. Ottoni & Axel M. Katz
The present study expands the range of Piabucus dentatus to the Pindaré River drainage of the Mearim River basin, Maranhão State, northeastern Brazil. The geographic distribution of this species was previously known only from the coastal drainages of the Paria Gulf in Venezuela to south of the mouth of the Amazon River. This is the first record of this species and of the genus Piabucus for this region, an extension of about 400 km southeastward....

First insights into karyotype evolution within the family Mormyridae

Catherine Ozouf-Costaz, Jean-Pierre Coutanceau, Céline Bonillo, Chantal Guidi-Rontani & Didier Paugy
The chromosomal diversity within six species of Mormyridae belonging to six different genera (Gnathonemus petersii, Marcusenius moorii, Ivindomyrus obdenboschi, Brienomyrus sp., Stomatorhinus walkeri and Petrocephalus microphthalmus) is investigated for the first time. These species have a conserved diploid chromosome number of 2n = 50 (except G. petersii 2n = 48) but different chromosome formulae, essentially involving pericentric inversions. C-banding has been used for the localization of heterochromatin. For a deeper interspecific comparison, several molecular markers...

Redescription of the ocellus-bearing cuskeel Neobythites kenyaensis (Ophidiidae), with new Southeast African records and remarks on intraspecific morphological and colour variation

Franz Uiblein & Jørgen G. Nielsen
Neobythites kenyaensis, a cuskeel (Ophidiidae) with two ocelli on the dorsal fin, is redescribed based on 33 meristic, body shape, colour, and otolith characters obtained from 15 specimens, 12 of which were studied for the first time. Nine of the 12 new specimens were collected during a research cruise off Mozambique together with vouchered colour photographs made on board when the fish were still fresh. Two specimens were collected off Natal, South Africa, one of...

Oxyeleotris colasi (Teleostei: Eleotridae), a new blind cave fish from Lengguru in West Papua, Indonesia

Laurent Pouyaud, Kadarusman, Renny K. Hadiaty, Jacques Slembouck, Napoleon Lemauk, Ruby V. Kusumah & Philippe Keith
Oxyeleotris colasi is the first hypogean fish recorded from West Papua. The habitat consists of a freshwater pool in the cave of Jabuenggara located in the heart of Seraran anticline in the limestone karst of Lengguru. The new species is most closely related to the blind cave fish O. caeca described by Allen (1996) from eastern New Guinea. The two troglomorphic species are hypothesised to be related to O. fimbriata, an epigean freshwater gudgeon that...

New dextral flounder Samariscus hexaradiatus sp. nov. (Samaridae, Pleuronectiformes) from the Solomon Islands, South-West Pacific Ocean

Juan M. Díaz de Astarloa, Romain Causse & Patrice Pruvost
A new right eyed flounder, Samariscus hexaradiatus, is described on the basis of two specimens collected from the Solomon Islands, southwestern Pacific Ocean, at depths of 135-325 m. The new species is distinguished from other species of the genus by the following characters: 6 pectoral-fin rays; 82 dorsal-fin rays and 60-62 anal-fin rays; 9 abdominal vertebrae and 32 caudal vertebrae; presence of ctenoid scales on the interorbital space and high number (74-75) of lateral-line scales....

Are mangroves important for reef fish on Mayotte Island (Indian Ocean)?

Rakamaly Madi Moussa
In order to understand the potential role of the mangroves of Mayotte Island for reef fishes, sampling was conducted monthly from April 2016 to April 2017 in three sites along a mangrove fringe: Bandrélé near fringing reef, Dzoumogné close to a river mouth and Malamani in a bay. Fishes were sampled using a fyke-net combined with visual census surveys (UVC) and eight environmental variables were recorded at each site to determine their relationship with the...

Circulation and hydrography over the Kerguelen Plateau

Young-Hyang Park & Frédéric Vivier
The Kerguelen Plateau is the largest near-meridional submarine plateau lying across the Antarctic Circumpolar Current (ACC), affecting significantly the large-scale circulation and pathways of the different water masses across the plateau. This has important implication not only for the local primary productivity and marine ecosystem, but also for the meridional overturning circulation of the Southern Ocean. We give here a short review of the circulation and hydrography as well as the ACC transport over and...

Proposed standard weight (Ws) equations for Telestes muticellus (Bonaparte, 1837) in the Tiber River basin

Daniela Giannetto, Antonella Carosi, Elisabetta Franchi, Giovanni Pedicello, Laura Pompei & Massimo Lorenzo
Relative weight (Wr) is a body condition index that enables the evaluation of the wellbeing of fish by comparing the actual weight of a specimen with the ideal weight of a specimen of the same species and same length, in good physiological condition, i.e., standard weight (Ws). Two methods of calculating standard weight are proposed in the literature: the RLP and the EmP method. The main aim of this study was to work out standard...

Colonization, hatching dates, and growth rates of juvenile Hyporhamphus picarti (Hemiramphidae), in the Nador lagoon (NE Morocco)

Sakina Jaafour, Ahmed Yahyaoui, Khalef Rabhi, Abderrahim Sadak & Rachid Amara
The Nador lagoon, located in the northeastern part of the Moroccan Mediterranean coast, was sampled with a beach seine at six stations during different seasons, from 2012 to 2014. The African halfbeak Hyporhamphus picarti was collected among the fish species and some aspect of its biology and ecology (colonization of the lagoon, spawning period and growth) was described for the first time. This species was found only in late summer and autumn, and all the...

How was a Pirapitinga, Piaractus brachypomus (Serrasalmidae) introduced in Croatian freshwaters?

Marko Ćaleta, Pero Tutman, Ivana Buj, Davor Zanella, Perica Mustafić, Mustafić Perica, Zoran Marčić, Milorad Mrakovčić & Jakov Dulčić
In the last week of July 2010, were caught accidentally two adult individuals of pirapitinga Piaractus brachypomus (Cuvier, 1818) in the Croatian waters. The first individual was caught in the main river channel of the Drava River (45°37’24”N; 18°33’15”E), 12 km upstream of the City of Osijek. The second individual was caught in the main channel of the Danube River, near the confluence of the Drava and Danube rivers (45°32’00”N; 18°57’03”E). Those records are the...

An aberrant extra fin in Zearaja chilensis (Chondrichthyes: Rajidae)

Mariana Yanel Deli Antoni, Gabriela Elina Delpiani, Sergio M. Delpiani, Ezequiel Mabragaña & Juan M. Díaz de Astarloa
The first case of an aberrant extra fin in a specimen of Zearaja chilensis (Guichenot, 1848), caught off Patagonian waters, Argentine Sea, is reported here.

Life history traits of the exploited Nile Tilapia (Oreochromis niloticus – Cichlidae) in a subtropical reservoir (Lao PDR)

Anne Tessier, Charlotte Blin, Maud Cottet, Kaoboun Kue, Jacques Panfili, Vincent Chanudet, Stéphane Descloux & Jean Guillard
Biological traits of Oreochromis niloticus were studied in order to identify potential differences between the population of the Nam Theun 2 Reservoir and other populations in Asia and in Africa. The study also aimed to characterize the demographic structure of the exploited population by fisheries in the reservoir. Toluidine-stained transverse section of otoliths from 322 specimens, collected between November 2015 and January 2017, were analysed to identify the periodicity of annulus formation and to age...

Maximum size of Atlantic mackerel (Scomber scombrus) and Atlantic chub mackerel (Scomber colias) in the Northeast Atlantic

María Rosario Navarro, Begoña Villamor, Sigmund Myklevoll, Juan Gil, Pablo Abaunza & Jesús Canoura
Maximum size records of Atlantic mackerel caught in different areas of the northeast Atlantic are presented along with the maximum size of Atlantic chub mackerel from the Gulf of Cadiz, Spain. One specimen of Atlantic mackerel (Scomber scombrus Linnaeus, 1758) was caught in the south of the Bay of Biscay in 2009. Its total length of 59 cm and weight of 1.9 kg are the maximum length and weight recorded for this species in this...

A new genus and species of neotropical electric fish, Japigny kirschbaum (Gymnotiformes: Sternopygidae), from French Guiana

François J. Meunier, Michel Jégu & Philippe Keith
Several specimens of a new knife-fish, Distocyclus guchereauae, belonging to Sternopygidae (Gym- notiformes), were caught in two tributaries (Litany and Tampoc) of Maroni river (French Guiana). This species differs from the other Distocyclus by having 13-14 versus 11-15 precaudal vertebrae, a small number of anal fin rays (184-187 versus 160-260), a triangular head with a short snout and a terminal mouth, and the anus located straight below the eyes.

A new genus and species of neotropical electric fish, Japigny kirschbaum (Gymnotiformes: Sternopygidae), from French Guiana

François J. Meunier, Michel Jégu & Philippe Keith
Several specimens of a new Sternopygidae, Japigny kirschbaum (Gymnotiformes), were caught in three rivers of French Guiana (Approuague, Mana, Maroni). This species, characterized by alternating large wide dark and vertical bands on the whole body and a scapular foramen, is considered as belonging to a new genus in the Eigenmanninae subfamily. As the other genus of this subfamily (Archolaemus, Distocyclus, Eigenmannia and Rhabdolichops) it has three radials, the third resulting from the fusion of radials...

Invalidity of Gasterosteus gymnurus (Cuvier, 1829) (Actinopterygii, Gasterosteidae) according to integrative taxonomy

Gaël P.J. Denys, Matthias Geiger, Henri Persat, Philippe Keith & Agnès Dettaï
The three-spined stickleback Gasterosteus spp. is a model organism largely used in biology. Four species have been described in Europe: G. aculeatus, G. gymnurus, G. islandicus and the extinct G. crenobiontus. Our integrative taxonomy study, including 194 specimens, demonstrates that these taxa are distinguishable neither with the mitochondrial COI marker nor the morphological characters like lateral plates, supposed to differentiate them. Thus, we invalidate Gasterosteus gymnurus, and we consider it as junior synonym of Gasterosteus...

Annotated checklist for fishes of the Main Nile Basin in the Sudan and Egypt based on recent specimen records (2006-2015)

Dirk Neumann, Henriette Obermaier & Timo Moritz
The results of several short ichthyological surveys on the Nile Basin in Sudan between 2006 and 2015 are presented. In attempting to represent major type localities and recently observed variability, we complement known field records with records of a reference collection of recent fish bones collected during the 1980s and records of aberrant cichlids populations in Egypt observed at El Fayum and in lakes of the Nile Delta. From 133 native species in the Republic...

Swimming depth and behaviour of newly recruiting post-larvae of Sicyopterus japonicus (Gobioidei: Sicydiinae) in the estuary of the Ota River, Wakayama, Japan

Midori Iida, Shun Watanabe & Katsumi Tsukamoto
Recruitment from the sea to freshwater is a turning point in the life history of amphidromous fish. The amphidromous gobioid subfamily Sicydiinae is distributed widely in Indo-Pacific regions. To understand their ecology at recruitment, which is poorly known for this subfamily, underwater observations of recruiting post-larvae of Sicyopterus japonicus were conducted and their swimming depth was measured in the estuary of the Ota River of Wakayama, Japan. During 16 observation periods from April to July...

Comparative analysis of the 1980s and 2004 macrozooplankton composition and distribution in the vicinity of Kerguelen and Heard Islands: seasonal cycles and oceanographic forcing of long-term change

Brian P.V. Hunt, Evgeny A. Pakhomov & Richard Williams
In this paper we present historic macrozooplankton data from the vicinity of the Kerguelen Islands during the Ukrainian Skif and Kalper (SKALP) surveys in February, April and July-August of 1987 and February 1988, in addition to a monthly composite of seston data collected during ad hoc cruises between 1980 and 1990. We compare these data with more recent surveys conducted at Heard Island (February 2004) and the Prince Edward Islands (PEI) to the west of...

Description of Labeo latebra (Cyprinidae) from the Nile River in Sudan

Timo Moritz & Dirk Neumann
A new Labeo species was discovered during surveys conducted on the Nile basin in Sudan between 2006 and 2016. It is described herein as Labeo latebra sp. nov. It differs from all other Labeo species of the Nile basin by having only 12, rarely 13, scales around the caudal peduncle (instead of 16 or more), and from all Labeo species occurring in the Nile River except L. meroensis by having only 4.5, rarely 5.5, scales...

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