428 Works

Using body mass index (BMI) to estimate mercury contamination of the blue shark (Prionace glauca) and the shortfin mako (Isurus oxyrinchus)

Sebastian Biton Porsmoguer, Ivan Dekeyser, Daniela Banaru, Marc Bouchoucha & Françoise Marco-Miralles
Blue shark (Prionace glauca) and shortfin mako (Isurus oxyrinchus) specimens were caught in the North-eastern Atlantic Ocean by Spanish and Portuguese longliners. They are considered as top-predators, particularly susceptible to bioaccumulate mercury (Hg). The Hg mean levels in blue shark and shortfin mako were 0.4 (SD = 0.3 mg kg-1) and 0.5 (SD = 0.9 mg kg-1), respectively. The body mass index (BMI) was tested to demonstrate the accumulation of Hg in these two top-predators,...

Insight into cumulative intra-guild and intra-specific depredation among sharks

Eric Clua, Jean-Baptiste Galves & Jonathan Mark Werry
Intra-guild predation (IGP), depredation of hooked sharks and cannibalism by large individuals on smaller conspecifics have been documented for both tiger shark Galeocerdo cuvier and bull shark Carcharhinus leucas. In this paper we report a case study of cumulative inter and intra-depredation from the Indian and the Pacific Ocean involving large G. cuvier and C. leucas adults at the final stage. These findings further the hypothesis that IGP and cannibalism among adult sharks occurs in...

Allozymic variability in European anchovy Engraulis encrasicolus ( L .) along the Moroccan coasts

Khalil Chahdi Ouazzani, Touria Benazzou & Malika Chlaida
Allozyme variation was used to investigate for the first time the genetic structure of European anchovies, Engraulis encrasicolus (Linnaeus, 1758), along the Moroccan coasts. A total of 420 individuals were collected at 11 sites during the anchovy spawning period of 2012. Eleven loci were tested, among them only LDH* [E.C:1.1.27] and PGM * [E.C:5.4.2.1] were polymorphic. Statistical analysis results showed no significant differentiation between samples (overall FST = 0.0077, p = 0.13). Genotypic proportions were...

Diet of Dasyatis pastinaca and Myliobatis aquila (Myliobatiformes) from the Azores, NE Atlantic

Dário Ponte, Luís M.D. Barcelos, Cristina Santos, João Medeiros & João P. Barreiros
This paper describes and discusses the feeding ecology of two stingray species that occur in the Azores: Dasyatis pastinaca and Myliobatis aquila. Both are common coastal species associated with sandy, muddy and rocky bottoms, from surface waters to depths of over 200 m. The diet described here is based on the stomach content analysis from 33 specimens (23 D. pastinaca, 10 M. aquila) collected by spearfishing between June and October 2010 at three different locations...

Comparative osteological study of three species of distinct genera of Haplotilapiini (Cichlidae)

Katrien Dierickx, Wim Wouters & Wim Van Neer
In palaeontological and archaeozoological studies dealing with tilapia remains, identifications are usually limited to the level of the tribe Tilapiini (now called Haplotilapiini). In the present study, dry skeletons of Oreochromis niloticus (Linnaeus, 1758), Oreochromis aureus (Steindachner, 1864), Sarotherodon galilaeus (Linnaeus, 1758) and Coptodon zillii (Gervais, 1848) were analysed with the aim of defining morphological characters on a series of isolated skeletal elements. Eighteen different skeletal elements that have good chances of being well preserved...

Revision of the cosmopolitan deep-sea genus Sciadonus (Teleostei, Bythitidae) with two new species

Jørgen G. Nielsen
The genus Sciadonus Garman, 1899 belongs to the aphyonid clade within the Bythitidae. The present revision is based on 304 specimens all trawled at great depths (1169-5610 m), 19 of which have not been examined earlier. As a consequence, the generic diagnosis from Nielsen et al. (1999) is here modified. The enlarged material resulted in synonymizing of S. galatheae (Nielsen, 1969) and S. pedicellaris Garman, 1899 and in the description of two new species, S....

First record of giant trevally (Caranx ignobilis) around the Clipperton Atoll-La Passion Island (North-Eastern Tropical Pacific)

Eric Clua, Sandra Bessudo, Michel Labrecque & Mauricio Hoyos-Padilla
A mission on the Clipperton atoll (Eastern Tropical Pacific) in February 2016 allowed the unprecedented identification of an adult individual of giant trevally Caranx ignobilis (Forsskål, 1775).

The relationship between Sardinella aurita landings and the environmental factors in Moroccan waters (21°-26°N)

Ayoub Baali, Najib Charouki, Khalid Manchih, Ismail Bessa, Ikram Elqoraychy, Mouna Elqendouci, Khadija Amenzoui & Ahmed Yahyaoui
The objective of this study is to assess the effects of environmental variations on the abundance of the round sardinella (Sardinella aurita, Valenciennes, 1847) in Moroccan waters (21°-26°N) using generalized additive models. The monthly variability of Sardinella aurita abundance in the south of Morocco is investigated using sea surface temperature (SST), upwelling index (UI) and chlorophyll-a (Chl-a) concentration from Global ARMOR3D L4 product, ESA Ocean Colour CCI and AquaMODIS satellite data between 2009 and 2016....

New maximum lengths for the freshwater blenny (Salaria fluviatilis Asso, 1801) and length comparison between continental and island rivers

Martin Laporte, Joseph Mattei, Philippe Perret, Bernard Roché, Dolors Vinyoles, Menachem Goren, Mahmoud Bacha, Zemouri Mourad, Quim Pou i Rovira, Patrick Berrebi & Pierre Magnan
Basic text books and fish databases suggest that the freshwater blenny has a maximum size of 150 mm (total length). However, no report of any measure of freshwater blenny longer than 111.8 (standard length) were found in the scientific literature. In this study, we propose a list of longer blennies, found in 52 sites distributed over 8 countries in order to document this life history trait of the species. The list was established from different...

Tench (Tinca tinca) in Sicily: current knowledge and research needs for conservation and management

Antonino Duchi
Despite its probable ancient introduction, the knowledge about tench (Tinca tinca) in Sicily is still inadequate. The only recent data can be found in studies on the distribution of freshwater fish in some areas of the island (namely the Eastern and South-Eastern sides) and consist mainly on presence/absence data, sometimes with an abundance estimate. The management of the populations is not based on biological and ecological information. This study reports historical and recent available data...

Domestication level of the most popular aquarium fish species: is the aquarium trade dependent on wild populations?

Fabrice Teletchea
Aquarium fish trade has strongly increased in the past decades to become one of the most popular hobbies globally. Historically, all aquarium fish traded were wild-caught. Then, an increasing number of fish species have been produced in captivity. The main goal of the present study is to apply the concept of domestication level to the hundred most popular aquarium fish species in Europe and North America. The levels of domestication of freshwater aquarium fish species...

New record and rediscription of Uranoscopus crassiceps Alcock, 1890 (Uranoscopidae) from Oman, Arabian Sea, northwestern Indian Ocean, based on adult specimens

Ronald Fricke, Laith A. Jawad, Lubna H. Al-Kharusi & Juma M. Al-Mamry
The stargazer Uranoscopus crassiceps is recorded from off the south coast of Oman for the first time. It is rediscribed on the basis of four adult specimens. The species is characterised by a large head (head length 2.7-2.9 in standard length, 2.6-2.7 in juveniles and subadults), and a relatively long pelvic fin (pelvic-fin length 4.2 in SL, 4.5-5.2 in juveniles and subadults); lower edge preopercle with 4-7 spines; labial fimbriae well developed; both nostrils with...

Diet composition and variations of Morocco dentex Dentex maroccanus (Sparidae) from Eastern Algeria

Rima Mohdeb, Farid Derbal & M. Hichem Kara
Morocco dentex is an important commercial sparid fish on Algerian coasts, where its distribution is irregular. In two sites, Jijel and El Kala areas, located in the northeast of Algeria, 1725 specimens of Dentex maroccanus were caught and examined for diet composition study and trophic level estimation. Their total length (weight) ranged from 10.4 cm (16.05 g) to 26.8 cm (332.47 g). The Relative Importance Index (%IRI) was used to characterize the relative importance of...

Visual census, photographic records and the trial of a video network provide first evidence of the elusive Sicyopterus cynocephalus in Australia

Brendan C. Ebner, James A. Donaldson, Gerald R. Allen & Philippe Keith
Opportunistic encounters with an elusive large-bodied sicydiine goby in a single plunge pool led us to photograph and deploy three video cameras to detect individuals in that pool. Subsequently, a catchment-wide search indicated that the species, eventually identified as Sicyopterus cynocephalus, was confined to the single pool where it was originally detected. A network of ten video cameras was then deployed to estimate the number of individuals of that species and of a congener, S....

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...

An additional specimen of a rare lanternbelly Acropoma lecorneti (Perciformes: Acropomatidae) from Vanuatu, South Pacific Ocean

Makoto Okamoto & Hiroyuki Motomura
A single specimen of a rare species of lanternbelly, Acropoma lecorneti Fourmanoir, 1988, was collected from Vanuatu in depths 275-290 m. The specimen represents the third specimen and the first record of the species from Vanuatu, South Pacific Ocean. This study provides new morphological data of A. lecorneti based on the additional specimen, with a comparison to other specimens of the species.

Some histological data on bone and teeth in the grey notothen (Lepidonotothen squamifrons) and in the mackerel icefish (Champsocephalus gunnari) (Notothenioidei; Perciformes; Teleostei)

François J. Meunier, Frédérique Lecomte & Guy Duhamel
The grey notothen (Lepidonotothen squamifrons) and the mackerel icefish (Champsocephalus gunnari) (Notothenioidei; Perciformes; Teleostei) are two Southern Ocean acellular boned fishes whose bones show cyclical growth marks. The degree of mineralization of their bony tissues, respectively 1.06 to 1.39 gHA/cm3 and 1.04 to 1.33 gHA/cm3, is close to the values of better known acellular boned fishes like the wolffish, the anglerfish or the horse mackerel. The histological characteristics of bony tissues are not fundamentally different...

Fish domestication in aquaculture: reassessment and emerging questions

Fabrice Teletchea
Historically, aquatic products were derived from wild capture fishes. However, declining marine catches since the early 1990s, combined with an increasing demand for fish products, has created a strong impetus for aquaculture. By 2014, half of global seafood consumption originated from aquaculture. The rise of aquaculture production has relied mostly on the domestication of a growing number of teleost fishes. In total, 250 species belonging to 71 families have been farmed since 1950. Among the...

First record of Butis gymnopomus (Eleotridae) in Sri Lankan waters

Sudesh Batuwita, Sampath Udugampala & Udeni Edirisinghe
A new record of the Gudgeon, Butis gymnopomus (Bleeker, 1853), was reported during an ichthyological survey in Sri Lanka. In Sri Lanka, this species was previously confused with B. butis. B. gymnopomus is easily distinguished from all reported congeners from Sri Lanka by the combination of the following characters: snout and interorbital region naked, absence of axillary scales, presence of prominent lower jaw, absence of bony crests on snout, lacking black spot on pectoral fin...

Use of tide pools as a spawning site by the bocon toadfish Amphichthys cryptocentrus (Batrachoidiformes: Batrachoididae), state of Maranhão, Brazil

Glínia K. F. Coelho, Luly de A. Nogueira, Pâmela S. de Brito, Nivaldo M. Piorski & Jorge L. S. Nunes
This note reports the first record of Amphichthys cryptocentrus using tide pools on the beaches of the state of Maranhão, Brazil as a spawning site and nursery.

Relationships between fish size and otolith morphology in ten clupeids from the Persian Gulf and Gulf of Oman

Tooraj Valinassab, Jafar Seifabadi, Hanie Homauni & Mohammad Ali Afraei-Bandpei
The relationships between sagitta otolith morphometry (length, height, and weight) and fish size (standard length and weight) were examined for ten species of clupeids in the Persian Gulf and Oman Sea. We provide new information regarding otolith morphology and body size relationships of these clupeids. Statistical tests to examine correlation between left and right otolith dimensions showed no significant differences. Regression models relating each otolith morphometric parameter to fish length are provided. According to the...

Diagnosing and solving the global crisis of fisheries: obstacles and rewards

Daniel Pauly
The multiple factors contributing to the crisis, which since the mid-1990s besets global fisheries, are presented along with key trends illustrating four manifestations of that crisis, i.e., (i) a declining world catch, (ii) increasing global fishing effort, (iii) declining catch per effort and profitability, and (iv) a three-way global expansion of fishing (geographic, bathymetric, taxonomic). The point is made that fisheries scientists and economists collectively know what is required to turn these trends around and...

Not another first: the ‘first’ Mediterranean record of Pomacanthus asfur (Forsskål, 1775) is probably based on a misidentification

Julian Evans & Patrick J. Schembri
Two species of Pomacanthus were recently reported from Maltese waters: P. maculosus, recorded in December 2012, and P. asfur, recorded in September 2015, with the latter representing the first Mediterranean record for the species. However, examination of the published images of the ‘P. asfur’ specimen suggests that it may has been misidentified, and more likely represents another record of P. maculosus. Therefore, to date, P. asfur has not yet been introduced into the Mediterranean Sea.

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 largemouth black bass (Micropterus salmoides): first record in the Neretva River delta, Adriatic drainage system of Croatia

Jakov Dulčić, Branko Dragičević, Pero Ugarković & Pero Tutman
The 10th October 2016, a specimen of Micropterus salmoides was caught by trammel net in the Mala Neretva River (Adriatic drainage system of Croatia). This is the first occurrence of the Largemouth black bass in this river, and by the way, in the hydrographic drainage system to the Adriatic Sea.

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