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15 % Scyliorhinus canicula 12 GRUND = 165 9 6 3 0 MEDITS = 193 81-100 121-140 161-180 201-220 241-260 281-300 321-340 361-380 401-420 Pre-print Volume –Posters Topic 4: THE ELASMOBRANCHS 441-460 481-500 521-540 561-580 Total length (mm) 41 st S.I.B.M. CONGRESS Rapallo (GE), 7-11 June 2010 221 15 12 9 6 3 0 241-260 % Mustelus mustelus 361-380 481-500 601-620 721-740 841-860 961-980 1081-1100 1201-1220 GRUND = 23 MEDITS = 97 Fig. 1 - Length/frequency distribution of Scyliorhinus canicula and Mustelus mustelus in the Ionian Sea from 1994 to 2009. Distribuzione lunghezza/frequenza di Scyliorhinus canicula e Mustelus mustelus nel Mar Ionio dal 1994 al 2009. Conclusions - The sampled population of S. canicula and M. mustelus in the Northwestern Ionian Sea mostly consisted of juveniles, probably due to the overexploitation of adult specimens. In particular, for M. mustelus the size distribution appears to be typically truncated probably in relation to its distribution in shallower waters where trawling is more concentrated. On the other hand, adults of S. canicula seem to take advantage from some refuge areas or habitats. The greater number of specimens collected of both species in the Sicilian and S. Maria di Leuca areas could be due to particular environmental conditions, as high trophism and the narrowness extend of the continental shelf. In addition, the protection areas and measures developed in Sicily could provide lower impact to adults enhancing the production of offspring. References BERTRAND J.A., GIL DE SOLA L., PAPACONSTANTINOU C., RELINI G., SOUPLET A. (2000) - An international bottom trawl survey in the Mediterranean: the MEDITS programme. Actes de Colloques IFREMER, 26: 76-93. CAPAPÉ C., VERGNE Y., REYNAUD C., GUÉLORGET O., QUIGNARD J.P. (2008) - Maturity, fecundity and occurrence of the smallspotted catshark Scyliorhinus canicula (Chondrichthyes: Scyliorhinidae) of the Languedocian coast (Southern France, North-western Mediterranean). Vie et Milieu. Life and Environment, 58 (1): 47-55. RELINI G. (2000) - La ricerca sulla pesca: le risorse demersali. Biol. Mar. Mediterr., 7 (4): 13-45. SAΪDI B., BRADAΪ M.N., BOUAΪN A. (2008) - Reproductive biology of the smooth-hound shark Mustelus mustelus (L.) in the Gulf of Gabès (south-central Mediterranean Sea). Journal of Fish Biology, 72: 1343-1354. SERENA F., BAINO R., REY J., PAPACOSTANTINOU C., RELINI G. (2005) - Catch composition and abundance of deep-sea elasmobranchs based on the MEDITS trawl survey. FAO Fish. Rep., 772: 395-408. STEHMANN M. (1998) - Revised maturity scale for sharks, rays and chimaerids. EC FAIR Project CT 95-0655 n. 40: 17-21. VACCHI M., NOTARBARTOLO DI SCIARA G. (2000) - I pesci cartilaginei nei mari italiani, una risorsa che richiede urgenti misure di tutela. Biol. Mar. Mediterr., 7 (1): 296-311. 1321-1340 1441-1460 1561-1580 1681-1700
Pre-print Volume –Posters Topic 4: THE ELASMOBRANCHS E. DE SABATA, S. CLÒ MedSharks, Via Ruggero Fauro, 82 - 00197 Roma, Italia. CTS, Roma, Italia. info@medsharks.org PUBLIC SIGHTING SCHEME REVEALS THE SEASONAL PRESENCE OF CETORHINUS MAXIMUS AROUND NORTH SARDINIA, ITALY UN PROGETTO DI AVVISTAMENTO PUBBLICO RIVELA LA PRESENZA DI CETORHINUS MAXIMUS NELLE ACQUE DELLA SARDEGNA SETTENTRIONALE Abstract – This study aims to contribute data on the presence, distribution and seasonal changes in numbers of basking sharks Cetorhinus maximus (Chondrichthyes) around North Sardinia (Central Mediterranean sea). Thanks mainly to a public sighting record scheme begun in 2005, 55 records of 99 basking sharks were collected in an area where only 14 individuals had previously been recorded. This ongoing public sighting scheme has significantly improved scientific understanding as well as public awareness of this species. Key-words: Basking shark, Cetorhinus maximus, Mediterranean, Sardinia, Marine Protected Area. Introduction - The basking shark (Cetorhinus maximus Gunnerus, 1765) is a very large, filter-feeding cold-water pelagic species named from its habit of ‘basking’ on the surface in good weather conditions, usually singly or in small groups. It is a migratory and widely distributed species, but only regularly seen in a few favored coastal locations. Much of the basking shark’s life history, movements, population dynamics and general ecology have not yet been described. Up to 2002 only 14 out of 535 basking sharks recorded in the MEDLEM program on captures and sightings of large cartilaginous fishes, which provides a general picture of the distribution of this species in the Mediterranean, were from Sardinian waters (Mancusi et al., 2005). In 2005 Operazione Squalo Elefante (OSE) was launched to gather general data on basking sharks in Sardinian waters, to identify particular areas for future investigations and to raise public awareness of the species, mainly through a public sighting recording scheme. Such schemes have been successfully used to gather simple, non-effort related data on basking sharks in several regions of the world (Speedie, 2003; Clò et al., 2002). Materials and methods – Data Collection. In 2005 a network of observers was established - that included the Coast Guard, personnel of Marine Protected Areas (Asinara, La Maddalena, Tavolara), biologists, recreational and professional fishermen, dive centre operators, yachtsmen and journalists - to report sightings and captures of basking sharks. In order to avoid overestimating shark numbers, in case of multiple sightings over a period up to 10 days in the same area we considered only one entry – selecting the one with the highest number of sharks seen at the same time. Pictures and video were also collected when available. Furthermore, a review of scientific and reliable grey literature yielded several entries dating from 1910. 41 st S.I.B.M. CONGRESS Rapallo (GE), 7-11 June 2010 222
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