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1

Occurrence of basking shark, Cetorhinus maximus (Elasmobranchii: Lamniformes: Cetorhinidae), off the Syrian coast (eastern Mediterranean) with first description of egg case

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Ali M., Saad A., Reynaud C., Capape C.
Acta Ichthyologica et Piscatoria
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2012
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tom 42
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nr 4
The authors report in this paper the first record of basking shark, Cetorhinus maximus (Gunnerus, 1765), off the coast of Syria (eastern Mediterranean). The specimen was an adult female, 690 cm total length and weighing approximately 2.5 t. It was a pregnant female at the beginning of gestation and contained 34 egg cases. The first description of C. maximus egg case is provided with short comments on the reproductive biology of the species.
2

First record of Physiculus dalwigki (Actinopterygii: Gadiformes: Moridae) from the Tunisian coast (central Mediterranean Sea)

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Capape C., Rafrafi-Nouira S., Diatta Y., Reynaud C.
Acta Ichthyologica et Piscatoria
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2020
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tom 50
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nr 2
3

First record of wedge sole, Dicologlossa cuneata (Actinopterygii: Pleuronectiformes: Soleidae), from the Levant Basin (eastern Mediterranean)

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Ali M., Saad A., Reynaud C., Capape C.
Acta Ichthyologica et Piscatoria
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2015
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tom 45
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nr 4
4

Diet of mediterranean moray, Muraena helena (Actinopterygii: Anguilliformes: Muraenidae), from the north-eastern Tunisian coast (Central Mediterranean)

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Sallami B., Ben Salem M., Reynaud C., Capape C.
Acta Ichthyologica et Piscatoria
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2014
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tom 44
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nr 4
Background. The feeding behaviour of Mediterranean moray, Muraena helena Linnaeus, 1758, from the coast of Tunisia (central Mediterranean) is poorly know and this study is a first step in determining prey consumption by M. helena as main information for improving fishery monitoring and management in the study area. Materials and Methods. Of the 411 sampled Mediterranean morays, 237 were males and 174 females. The stomach contents were removed, sorted, identified to the lowest possible taxon, counted, and weighed. For diet description, we calculated vacuity index (VI), abundance (mean number of preys) (NM), frequency of occurrence (F%), relative abundance (N%), and frequency by weight (W%). The contribution of each prey in the diet was also estimated with Index of Relative Importance (IRI) and its standardized value (%IRI). The trophic level (TROPH) was calculated for total sample to determine the diet of the species, but it was also related to the sex, size, and seasons. Results. The relation between the total length and the total body weight showed a positive allometry for both males and females. VI presented high values, for total sample, sex, size, and season. Muraena helena under study consumed a variety of prey items including 3 higher taxa, 13 families, and 20 species. Osteichthyans were the dominant preys with 15 taxa, representing 96.84% of weight, 78.83% of number, 84.21%, of frequency, and %IRI = 98.51. Crustaceans and cephalopods and sea grass were also ingested by M. helena, with lower %IRI (0.65, 0.66), and no ontogenetic changes in the diet were recorded related to sex, size, and seasons. The most common prey species were Diplodus annularis (Linnaeus, 1758) and D. vulgaris (Geoffroy Saint-Hilaire, 1817) with %IRI = 28.52 and 7.45, respectively while Serranus cabrilla (Linnaeus, 1758) was also consumed with %IRI = 1.84. The calculated TROPH was 4.27 (SE = 0.74); changes were recorded with seasons but not significantly different. Conclusion. Muraena helena is a carnivorous species feeding on prey items representing three higher taxa, osteichthyans being the most common in stomach contents and such findings suggest that it should be considered as a piscivorous species. The high value of trophic level pointed out that M. helena is a top predator.
5

First record of the Mediterranean spiderfish, Bathypterois dubius (Actinopterygii: Scopeliformes: Ipnopidae), from the Tunisian coast (central Mediterranean Sea)

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Capape C., Rafrafi-Nouira R., Reynaud C., Golani D.
Acta Ichthyologica et Piscatoria
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2019
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tom 49
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nr 3
6

A case of hermaphroditism in Tortonese’s stingray, Dasyatis tortonesei (Elasmobranchii: Rajiformes: Dasyatidae) from the lagoon of Bizerte, Tunisia

88%
Capape C., El Kamel-Moutalibi O., Mnasri N., Boumaiza M., Reynaud C.
Acta Ichthyologica et Piscatoria
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2012
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tom 42
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nr 2
A normal hermaphrodite Tortonese’s stingray, Dasyatis tortonesei Capapé, 1975, captured in the brackish Lagoon of Bizerte (north-eastern Tunisia) is described in this note. It was a large specimen measuring 685 mm total length, 350 mm disk width, and 2190 g of the total body mass. The specimen externally presented medial cuspidate tooth rows on both jaws, and two claspers were present, that were rigid and calcified although shorter than those observed in normal specimens. The dissection of the abdominal cavity revealed on each side, an ovary normally developed that contained yolked oocytes, a complete genital tract and an uterus less developed than in normal adult. Conversely the testes were rudimentary, both Leydig’s glands were developed and a complete, slightly convoluted, male duct existed on the left side only. In all, 13 cases of normal (4) and abnormal (9) hermaphroditism, including the Tunisian D. tortonesei, have been found in batoid species, to date, confirming that the phenomenon is very rare among these chondrichthyan fishes.
7

Maturity, reproductive cycle, and fecundity of spiny butterfly ray, Gymnura altavela (Elasmobranchii: Rajiformes: Gymnuridae), from the coast of Syria (eastern Mediterranean)

88%
Alkusairy H., Ali M., Saad A., Reynaud C., Capape C.
Acta Ichthyologica et Piscatoria
|
2014
|
tom 44
|
nr 3
Background. Captures of Gymnura altavela from the Syrian marine waters allowed to improve knowledge of size at first sexuality of males and females, reproductive period and fecundity. Materials and Methods. In all, 114 specimens were measured for disk width (DW) and weighed. Sexual maturity was determined in males from the length of claspers and aspects of the reproductive tract, and in females from the condition of ovaries and the morphology of the reproductive tract. Hepatosomatic index (HSI), gonadosomatic index (GSI) were calculated in males and females, and their variations related to size were considered in all categories of specimens. To investigate the embryonic development and the role of the mother during gestation, a chemical balance of development (CBD) was determined, based on the mean dry mass of fertilized eggs and fully developed oocytes. Test of normality was performed by using Shapiro–Wilk’s test, with P < 0.05. Tests for significance (P < 0.05) were performed by using ANOVA, Student t-test and the chi-square test. The linear regression was expressed in decimal logarithmic coordinates. In the relation mass versus total length and liver mass versus total length, comparisons of curves were carried out by using ANCOVA. Results. Females significantly outnumbered males throughout the year. Size at sexual maturity occurred for males at 771 mm DW and for females at 961 mm DW, and maximum size reached 893 mm DW and 1342 mm DW for males and females, respectively. Size at birth ranged between 281 and 367mm DW. Relations size (DW) versus total body mass (MT) did not show significant differences between males and females, relations size (DW) versus liver mass (ML) were significantly different between males and females suggesting that liver plays a more important role in life cycle of the latter. HSI increased with size of specimens especially in females. Similar patterns were observed for GSI in males and females. Females with active vitellogenesis were found throughout the year, and females carrying developing embryos in spring and in autumn, suggesting two gestation periods each year. CBD reached 22.3 and showed that G. altavela is a matrotrophic species. Ovarian fecundity was significantly higher than uterine fecundity, and litter size ranged between 1 and 4. Conclusion. The reproductive biology of G. altavela from the Syrian coast showed that a sustainable population is established in the area. The species develops K-selected biological characteristics as specimens from different marine areas and other elasmobranch species, it explained why it is endangered in the area.
8

First Mediterranean records of spinetail devil ray, Mobula japanica (Elasmobranchii: Rajiformes: Mobulidae)

88%
Capape C., Rafrafi-Nouira S., El Kamel-Moutalibi O., Boumaiza M., Reynaud C.
Acta Ichthyologica et Piscatoria
|
2015
|
tom 45
|
nr 2
Captures of 11 spinetail devil rays, Mobula japanica (Müller et Henle, 1841), from the northern coast of Tunisian (central Mediterranean) are reported in the present paper. Of these 11 specimens, five specimens were described. These captures constitute the first records of the species in the Tunisian waters, but also in the Mediterranean Sea, extending its distribution. This unusual occurrence of M. japanica is probably due to a migration from the eastern tropical Atlantic into the Mediterranean Sea through the Strait of Gibraltar.
9

First record of imperial blackfish, Schedophilus ovalis (Actinopterygii: Perciformes: Centrolophidae), from the Tunisian coast, central Mediterranean

76%
Rafrafi-Nouira S., Golani D., El Kamel-Moutalibi O., Boumaiza M., Reynaud C., Capere C.
Acta Ichthyologica et Piscatoria
|
2015
|
tom 45
|
nr 2
Two specimens of imperial blackfish, Schedophilus ovalis (Cuvier 1829), were found for the first time off the Tunisian coast, in northern area. Both specimens are described, and occurrence of the species in the area and the Mediterranean Sea is discussed and commented.
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