Pre-print Volume - Posters BENTHOS COMMITEE results are not comparable with other L. phalangium fields, from other areas, in term of occurrence, density and extension, nevertheless the associated demersal species seem to be very similar. These preliminary results provide further evidence on the importance of this facies in structuring demersal communities and in enhancing the habitat heterogeneity (Gili and Coma, 1998; Colloca et al., 2004). Moreover, the knowledge about an essential fish habitat, as L. phalangium field, should be considered priority in fisheries management of the Southern Tyrrhenian Sea. Tab. 1 – List of most frequent species and their density and biomass values in the 3C and 31C stations. Lista delle specie più frequenti e loro valori di densità e biomassa nelle stazioni 3C e 31C. 3 C 31 C SPECIES kg/km 2 n/km 2 kg/km 2 n/km 2 Aspitrigla cuculus (Linnaeus, 1758) 0,25 33,33 3,20 60,00 Boops boops (Linnaeus, 1758) 8,67 100,00 1,20 20,00 Cepola macrophthalma (Linnaeus, 1758) 1,00 50,00 0,20 20,00 Lepidotrigla cavillone (Lacepède, 1801) 0,17 16,67 24,80 2140,00 Lophius budegassa (Spinola, 1807) 0,00 0,00 10,00 60,00 Macroramphosus scolopax (Linnaeus, 1758) 0,17 83,33 0,00 0,00 Merluccius merluccius (Linnaeus, 1758) 33,33 1766,67 12,40 440,00 Mullus barbatus (Linnaeus, 1758) 3,33 83,33 43,20 760,00 Pagellus acarne (Risso, 1826) 8,00 116,67 0,00 0,00 Pagellus erythrinus (Linnaeus, 1758) 10,83 50,00 0,00 0,00 Phycis blennoides (Brünnich, 1768) 2,67 33,33 0,80 20,00 Serranus hepatus (Linnaeus, 1766) 0,17 33,33 0,00 0,00 Spicara flexuosa (Rafinesque, 1810) 12,67 283,33 14,80 180,00 Spicara smaris (Linnaeus, 1758) 0,00 0,00 3,20 100,00 Trachurus trachurus (Linnaeus, 1758) 63,33 1550,00 19,00 2100,00 Zeus faber (Linnaeus, 1758) 0,33 16,67 0,00 0,00 Parapenaeus longirostris (Lucas, 1846) 0,25 50,00 16,00 40,00 Alloteuthis media (Linnaeus, 1758) 15,00 1133,33 7,60 800,00 Alloteuthis subulata (Lamarck, 1798) 0,08 33,33 0,40 160,00 Eledone cirrhosa (Lamarck, 1798) 0,42 100,00 0,00 0,00 Illex coindetii (Verany, 1839) 31,67 116,67 2,40 20,00 Scaeurgus unicirrhus (Orbigny, 1840) 0,00 0,00 0,40 40,00 Sepia elegans (Blainville, 1827) 0,50 66,67 0,40 100,00 Sepia orbignyana (Férussac, 1826) 0,25 66,67 0,00 0,00 References COLLOCA F., CARDINALE M., BELLUSCIO A., ARDIZZONE G. (2003) - Pattern of distribution and diversity of demersal assemblages in the central Mediterranean Sea. Estuar. Coast. Shelf Sci., 56: 469-480. COLLOCA F., CARPENTERI P., BALESTRI E., ARDIZZONE G.D. (2004) - A critical habitat for Mediterranean fish resources: shelf-break areas with Leptometra phalangium (Echinodermata: Crinoidea). Mar. Biol., 145: 1129-1142. GILI J.M., COMA R. (1998) - Benthic suspension feeders: their paramount role in littoral marine food webs. Trends Ecol. Evol., 13: 316–321. KALLIANOTIS A., SOPHRONIDIS K., VIDORIS P., TSELEPIDES A. (2000) - Demersal fish and megafaunal assemblages on the Cretan continental shelf and slope (NE Mediterranean): seasonal variation in species density, biomass and diversity. Progr. Oceanog., 46: 429-455. PÉRÈS J.M., PICARD J. (1964) - Nouveau manuel de bionomie benthique de la mer Méditerranée. Recl. Trav. Stn. Mar. Endoume, 31: 1-137. REALE B., SARTOR P., LIGAS A., VIVA C., BERTOLINI D., DE RANIERI S., BELCARI P. (2005) – Demersal species assemblage on the Leptometra phalangium (J. Müller, 1841) (Echinodermata; Crinoidea) bottoms of the Northern Tyrrhenian Sea. Biol. Mar. Mediterr., 12 (1): 571-574. 41 st S.I.B.M. CONGRESS Rapallo (GE), 7-11 June 2010 279
Pre-print Volume - Posters BENTHOS COMMITEE M. MEREU, P. MASALA, A. MACCIONI, D. STACCA, AL. CAU, D. CUCCU Department of Animal Biology and Ecology, University of Cagliari, Via T. Fiorelli, 1 – 09126 Cagliari, Italia. cuccu@unica.it TAGGING OCTOPUS VULGARIS (OCTOPODA: OCTOPODIDAE) IN AN AREA OF CENTRAL WESTERN SARDINIAN WATERS MARCATURA DI OCTOPUS VULGARIS (OCTOPODA: OCTOPODIDAE) IN UN’AREA DELLA SARDEGNA CENTRO OCCIDENTALE Abstract – Preliminary data on growth and movements of Octopus vulgaris wild populations of the Mediterranean Sea recorded during a tagging program in the central western Sardinian waters were reported and compared with literature. Key-words: Octopus vulgaris, tagging, growth, movements, Mediterranean Sea. Introduction - Octopus vulgaris Cuvier, 1797 has a world-wide distribution in tropical, subtropical and temperate waters of the Atlantic, Indian, Pacific oceans and Mediterranean Sea (Guerra, 1992). It inhabits continental shelf and slope waters, occupying diverse habitats (Guerra, 1992). Age and growth of O. vulgaris were studied using indirect or direct methods (Semmens et al., 2004). In particular, within direct methods, mark-recapture experiments in wild represented useful tools to estimate age, growth, and lifespan and also to obtain information on the movements of the species (e.g. Domain et al., 2000; Nagasawa et al., 1993). Taking into account this, for the first time in Mediterranean an experimental tagging program for O. vulgaris was performed in the central western Sardinian waters. In this note, preliminary results on growth and movements of O. vulgaris were reported. Materials and methods - Octopus vulgaris specimens caught from May to October 2009 by crab-traps off the central western Sardinia coast at depth of 20 to 40 m were tagged with Petersen discs on 3 rd left arm and release into the same fishing areas. For each specimen dorsal mantle length (ML, to the nearest mm), total weight (TW, to the nearest g) and sex were recorded before release and after recapture. Maturity stage was determined in the recaptures, using for both sexes, the scale of Silva et al. (2002) modified (1, immature; 2, maturing; 3, mature; 4, spawning; 5, post-spawning). Geographical positions of release and recapture were recorded and the straight distance between release and recapture was calculated. Interval of freedom (DF, in days) and specific growth rates (SGR) according to Domain et al. (2000) were also determined. Results - On the whole 132 males (ML: 32.0-130.0 mm; TW: 30-1400 g), 137 females (ML: 32.0-145.0 mm; TW: 30-1230g) and 16 undetermined (ML: 18.0-64.0 mm; TW: 20-350 g) of Octopus vulgaris were tagged. Overall, 9 octopuses tagged were recaptured by traps and 2 tags were found attached in a trammel net for lobster fishing, both during the commercial fishery (Tab. 1). Four SGR positive values were recorded for octopuses recaptured after 8-25 days. As shown in Table 1 the remaining 5 recaptures (DF: 18-30) had null or negative SGR-values. The straight distance between release to recapture ranged from 411 to 1200 meters for males and was 20 meters for the only female recovered. 41 st S.I.B.M. CONGRESS Rapallo (GE), 7-11 June 2010 280
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