This present paper records the catch of a pregnant female little sleeper shark Somniosus rostratus (Risso, 1826) in the waters of the Catalan continental slope (Spain). Eight embryos were found inside the animal. This is the first record of a pregnant female S. rostratus in the western Mediterranean.Se señala la captura de una hembra de tiburón dormilón Somniosus rostratus (Risso, 1826) frente a las costas de Cataluña (España). Dicho ejemplar estaba grávido y era portador de ocho embriones. éste es el primer registro de una hembra preñada de esta especie en el Mediterráneo occidental.Instituto Español de Oceanografí

Barrull, J.

Mate, I.

English

This present paper records the catch of a pregnant female little sleeper shark Somniosus ros-tratus (Risso, 1826) in the waters of the Catalan continental slope (Spain). Eight embryos were found inside the animal. This is the first record of a pregnant female S. rostratus in the western Mediterranean

J. Barrull

I. Mate

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NOTE First record of a pregnant female little sleeper shark Somniosus rostratus (Risso, 1826) on the Spanish Mediterranean coast

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NOTEFirst record of a pregnant female little sleeper sharkSomniosus rostratus (Risso, 1826) on the SpanishMediterranean coastJ. Barrull and I. MateLaboratorio de Vertebrados, Sección de Ictiología. Museo de Zoología de Barcelona. Apdo. 593. 08080 Barcelona, Spain.E-mail: jbarrull@pie.xtec.esReceived September 2000. Accepted June 2001.ABSTRACTThis present paper records the catch of a pregnant female little sleeper shark Somniosus ros-tratus (Risso, 1826) in the waters of the Catalan continental slope (Spain). Eight embryos werefound inside the animal. This is the first record of a pregnant female S. rostratus in the westernMediterranean.Key words: Barcelona, embryos, little sleeper shark, Mediterranean Sea, pregnant, Somniosusrostratus.RESUMENPrimer registro de una hembra preñada de tiburón dormilón Somniosus rostratus (Risso, 1826) enlas costas españolas del MediterráneoSe señala la captura de una hembra de tiburón dormilón Somniosus rostratus (Risso, 1826) frente alas costas de Cataluña (España). Dicho ejemplar estaba grávido y era portador de ocho embriones. Éste es elprimer registro de una hembra preñada de esta especie en el Mediterráneo occidental.Palabras clave: Barcelona, embriones, grávida, mar Mediterráneo, Somniosus rostratus, tiburón dor-milón. 323Bol. Inst. Esp. Oceanogr. 17 (3 y 4). 2001: 323-325 BOLETÍN. INSTITUTO ESPAÑOL DE OCEANOGRAFÍAISSN: 0074-0195© Instituto Español de Oceanografía, 2001The little sleeper shark Somniosus rostratus (Risso,1826) is a benthic deepwater species (Cadenat andBlache, 1981). It has been reported in theMediterranean Sea, eastern Atlantic, and westernPacific (Tortonese, 1956; Compagno, 1984;McEachran and Branstetter, 1984; Moreno, 1995).According to Capapé (1989), S. rostratus is rare inthe Mediterranean; in any case, knowledge of itsrange there has advanced in recent years (Cigala-Fulgosi and Gandolfi, 1983; Golani, 1986-1987;Barrull and Mate, 1995). The present paperrecords the catch of a pregnant female of thisspecies in the waters of the Catalan continentalslope (northeastern Spain).A pregnant female S. rostratus (figure 1) measur-ing 1 000 mm total length (TL) was caught in the wa-ters of the continental slope off Catalonia on 20December 1999 by the fishing vessel Maireta II basedat the port of Barcelona (Spain). Eight embryos (fig-ure 2), six males and two females (95-105 mm TL),were found inside the animal.The specimen was caught in a trawler net, at adepth of 534 m, on the fishing ground know as LaSerola, at 41º 01' N, 2º 16' E. Biometric data for thepregnant female (deposited in the Museu Cau delTauró de l’Arboç, catalogue number MCTA-00243)are presented in table I. Two embryos were deposit-ed in the Museu de Zoologia de Barcelona, one male(100 mm TL) with catalogue number MZB-2000-0058 and one female (105 mm TL), MZB-2000-0059.Six embryos were deposited in the Museu Cau delTauró de l’Arboç: male (103 mm TL), MCTA-00244;male (99 mm TL), MCTA-00245; male (101 mm TL),MCTA-00247; male (95 mm TL), MCTA-00248);male (98 mm TL), MCTA-00249; female (100 mmTL), MCTA-00250. In the Mediterranean to date, only a few preg-nant female S. rostratus have been caught, in Italianwaters (Cigala-Fulgosi and Gandolfi, 1983); the factthat this is the first record of a pregnant female onthe Spanish Mediterranean coast should warrantspecial interest.ACKNOWLEDGEMENTSWe are grateful to Joan Ribé, Museu Cau delTauró de l’Arboç, who allowed us to study the col-lected specimens, and donated two embryos to theMuseu de Zoologia de Barcelona.REFERENCESBarrull, J. and I. Mate. 1995. Presencia de tiburón dormilónSomniosus rostratus (Risso, 1826) en el mar Catalán (marMediterráneo). Misc. Zool. 18: 200-202.J. Barrull and I. Mate First pregnant female Somniosus rostratus on the Spanish Mediterranean coastBol. Inst. Esp. Oceanogr. 17 (3 y 4). 2001: 323-325324Figure 1. Pregnant female Somniosus rostratusFigure 2. Embryos, with yolk sacTable I. Biometric data (in mm) of a pregnant femaleSomniosus rostratusTotal length 1 000Standard length 825Snout to first dorsal 370Snout to first dorsal inner edge 495Snout to second dorsal 710Snout to second dorsal inner edge 805First to second dorsal 340Second dorsal to upper caudal 115Upper caudal 175Lower caudal 140Base of notch to tip 75First dorsal length 135First dorsal base 75First dorsal inner edge 60First dorsal height 55Second dorsal length 100Second dorsal base 50Second dorsal inner edge 50Second dorsal height 70Snout to spiracle 115Snout to eye 60Eye diameter 15First to fifth gill slits 60Pectoral length 120Pectoral height 80Pectoral base 55Pectoral inner edge 25Pelvic length 55Pelvic height 65Pelvic base 50Pelvic inner edge 35Cadenat, J. and J. Blache. 1981. Faune tropicale XXI. Requinsde Méditerrranée et d’Atlantique (plus particulièrement de laCôte Occidentale d’Afrique). Orstom. Paris: 330 pp.Capapé, C. 1989. Les sélaciens des côtes méditerranéennes:aspects generaux de leur écologie et exemples de peu-plements. Océanis 15 (3): 309-331.Cigala-Fulgosi, F. and G. Gandolfi. 1983. Re-description ofexternal morphology of Somniosus rostratus (Risso, 1826),with special reference to its squamation and cutaneoussensory organs, and aspects of their functional morphol-ogy (Pisces Selachii Squalidae). Monitore Zool. Ital. (NewSer.) 17: 27-70.Compagno, L. J. V. 1984. FAO Species Catalogue. Vol. 4.Sharks of the world. An annotated and illustrated cata-logue of sharks known to date. Part 1. Hexanchiformesto Lamniformes. FAO Fish. Synop. 125 (4): 1-249.Golani, D. 1986-1987. On deep-water sharks caught off theMediterranean coast of Israel. Israel Journal of Zoology 34:23-31.McEachran, J. D. and S. Branstetter. 1984. Squalidae. In:Fishes of the North-eastern Atlantic and Mediterranean,FNAM. P. J. P. Whitehead, M. L. Bauchot, J. C. Hureau, J.Nielsen and E. Tortonese (eds.) I: 1-144. Unesco. Paris.Moreno, J. A. 1995. Guía de los tiburones de aguas ibéricas,Atlántico nororiental y Mediterráneo. Pirámide. Madrid: 310pp.Tortonese, E. 1956. Fauna d’Italia. Leptocardia, Ciclostomata,Selachii. Calderini. Bologna: 332 pp.J. Barrull and I. Mate First pregnant female Somniosus rostratus on the Spanish Mediterranean coastBol. Inst. Esp. Oceanogr. 17 (3 y 4). 2001: 323-325 325

First record of a pregnant female little sleeper shark Somniosus rostratus (Risso, 1826) on the Spanish Mediterranean coast

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First record of a pregnant female little sleeper shark Somniosus rostratus (Risso, 1826) on the Spanish Mediterranean coast

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